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965b20e39c
llvm/lib/Target/PowerPC/PPCISelLowering.cpp
Ulrich Weigand 965b20e39c [PowerPC] Always use mfocrf if available 
When accessing just a single CR register, it is always preferable to
use mfocrf instead of mfcr, if the former is available on the CPU.

Current code makes that distinction in many, but not all places
where a single CR register value is retrieved.  One missing
location is PPCRegisterInfo::lowerCRSpilling.

To fix this and make this simpler in the future, this patch changes
the bulk of the back-end to always assume mfocrf is available and
simply generate it when needed.

On machines that actually do not support mfocrf, the instruction
is replaced by mfcr at the very end, in EmitInstruction.

This has the additional benefit that we no longer need the
MFCRpseud hack, since before EmitInstruction we always have
a MFOCRF instruction pattern, which already models data flow
as required.

The patch also adds the MFOCRF8 version of the instruction,
which was missing so far.

Except for the PPCRegisterInfo::lowerCRSpilling case, no change
in generated code intended.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185556 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-03 17:05:42 +00:00

7798 lines
312 KiB
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//===-- PPCISelLowering.cpp - PPC DAG Lowering Implementation -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the PPCISelLowering class.
//
//===----------------------------------------------------------------------===//
#include "PPCISelLowering.h"
#include "MCTargetDesc/PPCPredicates.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCPerfectShuffle.h"
#include "PPCTargetMachine.h"
#include "PPCTargetObjectFile.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
static cl::opt<bool> DisablePPCPreinc("disable-ppc-preinc",
cl::desc("disable preincrement load/store generation on PPC"), cl::Hidden);
static cl::opt<bool> DisableILPPref("disable-ppc-ilp-pref",
cl::desc("disable setting the node scheduling preference to ILP on PPC"), cl::Hidden);
static cl::opt<bool> DisablePPCUnaligned("disable-ppc-unaligned",
cl::desc("disable unaligned load/store generation on PPC"), cl::Hidden);
static TargetLoweringObjectFile *CreateTLOF(const PPCTargetMachine &TM) {
if (TM.getSubtargetImpl()->isDarwin())
return new TargetLoweringObjectFileMachO();
if (TM.getSubtargetImpl()->isSVR4ABI())
return new PPC64LinuxTargetObjectFile();
return new TargetLoweringObjectFileELF();
}
PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
: TargetLowering(TM, CreateTLOF(TM)), PPCSubTarget(*TM.getSubtargetImpl()) {
const PPCSubtarget *Subtarget = &TM.getSubtarget<PPCSubtarget>();
setPow2DivIsCheap();
// Use _setjmp/_longjmp instead of setjmp/longjmp.
setUseUnderscoreSetJmp(true);
setUseUnderscoreLongJmp(true);
// On PPC32/64, arguments smaller than 4/8 bytes are extended, so all
// arguments are at least 4/8 bytes aligned.
bool isPPC64 = Subtarget->isPPC64();
setMinStackArgumentAlignment(isPPC64 ? 8:4);
// Set up the register classes.
addRegisterClass(MVT::i32, &PPC::GPRCRegClass);
addRegisterClass(MVT::f32, &PPC::F4RCRegClass);
addRegisterClass(MVT::f64, &PPC::F8RCRegClass);
// PowerPC has an i16 but no i8 (or i1) SEXTLOAD
setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
// PowerPC has pre-inc load and store's.
setIndexedLoadAction(ISD::PRE_INC, MVT::i1, Legal);
setIndexedLoadAction(ISD::PRE_INC, MVT::i8, Legal);
setIndexedLoadAction(ISD::PRE_INC, MVT::i16, Legal);
setIndexedLoadAction(ISD::PRE_INC, MVT::i32, Legal);
setIndexedLoadAction(ISD::PRE_INC, MVT::i64, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i1, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i8, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i16, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i32, Legal);
setIndexedStoreAction(ISD::PRE_INC, MVT::i64, Legal);
// This is used in the ppcf128->int sequence. Note it has different semantics
// from FP_ROUND: that rounds to nearest, this rounds to zero.
setOperationAction(ISD::FP_ROUND_INREG, MVT::ppcf128, Custom);
// We do not currently implement these libm ops for PowerPC.
setOperationAction(ISD::FFLOOR, MVT::ppcf128, Expand);
setOperationAction(ISD::FCEIL, MVT::ppcf128, Expand);
setOperationAction(ISD::FTRUNC, MVT::ppcf128, Expand);
setOperationAction(ISD::FRINT, MVT::ppcf128, Expand);
setOperationAction(ISD::FNEARBYINT, MVT::ppcf128, Expand);
setOperationAction(ISD::FREM, MVT::ppcf128, Expand);
// PowerPC has no SREM/UREM instructions
setOperationAction(ISD::SREM, MVT::i32, Expand);
setOperationAction(ISD::UREM, MVT::i32, Expand);
setOperationAction(ISD::SREM, MVT::i64, Expand);
setOperationAction(ISD::UREM, MVT::i64, Expand);
// Don't use SMUL_LOHI/UMUL_LOHI or SDIVREM/UDIVREM to lower SREM/UREM.
setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
// We don't support sin/cos/sqrt/fmod/pow
setOperationAction(ISD::FSIN , MVT::f64, Expand);
setOperationAction(ISD::FCOS , MVT::f64, Expand);
setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
setOperationAction(ISD::FREM , MVT::f64, Expand);
setOperationAction(ISD::FPOW , MVT::f64, Expand);
setOperationAction(ISD::FMA , MVT::f64, Legal);
setOperationAction(ISD::FSIN , MVT::f32, Expand);
setOperationAction(ISD::FCOS , MVT::f32, Expand);
setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
setOperationAction(ISD::FREM , MVT::f32, Expand);
setOperationAction(ISD::FPOW , MVT::f32, Expand);
setOperationAction(ISD::FMA , MVT::f32, Legal);
setOperationAction(ISD::FLT_ROUNDS_, MVT::i32, Custom);
// If we're enabling GP optimizations, use hardware square root
if (!Subtarget->hasFSQRT() &&
!(TM.Options.UnsafeFPMath &&
Subtarget->hasFRSQRTE() && Subtarget->hasFRE()))
setOperationAction(ISD::FSQRT, MVT::f64, Expand);
if (!Subtarget->hasFSQRT() &&
!(TM.Options.UnsafeFPMath &&
Subtarget->hasFRSQRTES() && Subtarget->hasFRES()))
setOperationAction(ISD::FSQRT, MVT::f32, Expand);
setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
if (Subtarget->hasFPRND()) {
setOperationAction(ISD::FFLOOR, MVT::f64, Legal);
setOperationAction(ISD::FCEIL, MVT::f64, Legal);
setOperationAction(ISD::FTRUNC, MVT::f64, Legal);
setOperationAction(ISD::FFLOOR, MVT::f32, Legal);
setOperationAction(ISD::FCEIL, MVT::f32, Legal);
setOperationAction(ISD::FTRUNC, MVT::f32, Legal);
// frin does not implement "ties to even." Thus, this is safe only in
// fast-math mode.
if (TM.Options.UnsafeFPMath) {
setOperationAction(ISD::FNEARBYINT, MVT::f64, Legal);
setOperationAction(ISD::FNEARBYINT, MVT::f32, Legal);
// These need to set FE_INEXACT, and use a custom inserter.
setOperationAction(ISD::FRINT, MVT::f64, Legal);
setOperationAction(ISD::FRINT, MVT::f32, Legal);
}
}
// PowerPC does not have BSWAP, CTPOP or CTTZ
setOperationAction(ISD::BSWAP, MVT::i32 , Expand);
setOperationAction(ISD::CTTZ , MVT::i32 , Expand);
setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand);
setOperationAction(ISD::BSWAP, MVT::i64 , Expand);
setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i64, Expand);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Expand);
if (Subtarget->hasPOPCNTD()) {
setOperationAction(ISD::CTPOP, MVT::i32 , Legal);
setOperationAction(ISD::CTPOP, MVT::i64 , Legal);
} else {
setOperationAction(ISD::CTPOP, MVT::i32 , Expand);
setOperationAction(ISD::CTPOP, MVT::i64 , Expand);
}
// PowerPC does not have ROTR
setOperationAction(ISD::ROTR, MVT::i32 , Expand);
setOperationAction(ISD::ROTR, MVT::i64 , Expand);
// PowerPC does not have Select
setOperationAction(ISD::SELECT, MVT::i32, Expand);
setOperationAction(ISD::SELECT, MVT::i64, Expand);
setOperationAction(ISD::SELECT, MVT::f32, Expand);
setOperationAction(ISD::SELECT, MVT::f64, Expand);
// PowerPC wants to turn select_cc of FP into fsel when possible.
setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
// PowerPC wants to optimize integer setcc a bit
setOperationAction(ISD::SETCC, MVT::i32, Custom);
// PowerPC does not have BRCOND which requires SetCC
setOperationAction(ISD::BRCOND, MVT::Other, Expand);
setOperationAction(ISD::BR_JT, MVT::Other, Expand);
// PowerPC turns FP_TO_SINT into FCTIWZ and some load/stores.
setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
// PowerPC does not have [U|S]INT_TO_FP
setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
setOperationAction(ISD::BITCAST, MVT::f32, Expand);
setOperationAction(ISD::BITCAST, MVT::i32, Expand);
setOperationAction(ISD::BITCAST, MVT::i64, Expand);
setOperationAction(ISD::BITCAST, MVT::f64, Expand);
// We cannot sextinreg(i1). Expand to shifts.
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
setOperationAction(ISD::EXCEPTIONADDR, MVT::i64, Expand);
setOperationAction(ISD::EHSELECTION, MVT::i64, Expand);
setOperationAction(ISD::EXCEPTIONADDR, MVT::i32, Expand);
setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
// NOTE: EH_SJLJ_SETJMP/_LONGJMP supported here is NOT intended to support
// SjLj exception handling but a light-weight setjmp/longjmp replacement to
// support continuation, user-level threading, and etc.. As a result, no
// other SjLj exception interfaces are implemented and please don't build
// your own exception handling based on them.
// LLVM/Clang supports zero-cost DWARF exception handling.
setOperationAction(ISD::EH_SJLJ_SETJMP, MVT::i32, Custom);
setOperationAction(ISD::EH_SJLJ_LONGJMP, MVT::Other, Custom);
// We want to legalize GlobalAddress and ConstantPool nodes into the
// appropriate instructions to materialize the address.
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
setOperationAction(ISD::JumpTable, MVT::i32, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
setOperationAction(ISD::BlockAddress, MVT::i64, Custom);
setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
setOperationAction(ISD::JumpTable, MVT::i64, Custom);
// TRAP is legal.
setOperationAction(ISD::TRAP, MVT::Other, Legal);
// TRAMPOLINE is custom lowered.
setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom);
setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom);
// VASTART needs to be custom lowered to use the VarArgsFrameIndex
setOperationAction(ISD::VASTART , MVT::Other, Custom);
if (Subtarget->isSVR4ABI()) {
if (isPPC64) {
// VAARG always uses double-word chunks, so promote anything smaller.
setOperationAction(ISD::VAARG, MVT::i1, Promote);
AddPromotedToType (ISD::VAARG, MVT::i1, MVT::i64);
setOperationAction(ISD::VAARG, MVT::i8, Promote);
AddPromotedToType (ISD::VAARG, MVT::i8, MVT::i64);
setOperationAction(ISD::VAARG, MVT::i16, Promote);
AddPromotedToType (ISD::VAARG, MVT::i16, MVT::i64);
setOperationAction(ISD::VAARG, MVT::i32, Promote);
AddPromotedToType (ISD::VAARG, MVT::i32, MVT::i64);
setOperationAction(ISD::VAARG, MVT::Other, Expand);
} else {
// VAARG is custom lowered with the 32-bit SVR4 ABI.
setOperationAction(ISD::VAARG, MVT::Other, Custom);
setOperationAction(ISD::VAARG, MVT::i64, Custom);
}
} else
setOperationAction(ISD::VAARG, MVT::Other, Expand);
// Use the default implementation.
setOperationAction(ISD::VACOPY , MVT::Other, Expand);
setOperationAction(ISD::VAEND , MVT::Other, Expand);
setOperationAction(ISD::STACKSAVE , MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE , MVT::Other, Custom);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32 , Custom);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64 , Custom);
// We want to custom lower some of our intrinsics.
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
// To handle counter-based loop conditions.
setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::i1, Custom);
// Comparisons that require checking two conditions.
setCondCodeAction(ISD::SETULT, MVT::f32, Expand);
setCondCodeAction(ISD::SETULT, MVT::f64, Expand);
setCondCodeAction(ISD::SETUGT, MVT::f32, Expand);
setCondCodeAction(ISD::SETUGT, MVT::f64, Expand);
setCondCodeAction(ISD::SETUEQ, MVT::f32, Expand);
setCondCodeAction(ISD::SETUEQ, MVT::f64, Expand);
setCondCodeAction(ISD::SETOGE, MVT::f32, Expand);
setCondCodeAction(ISD::SETOGE, MVT::f64, Expand);
setCondCodeAction(ISD::SETOLE, MVT::f32, Expand);
setCondCodeAction(ISD::SETOLE, MVT::f64, Expand);
setCondCodeAction(ISD::SETONE, MVT::f32, Expand);
setCondCodeAction(ISD::SETONE, MVT::f64, Expand);
if (Subtarget->has64BitSupport()) {
// They also have instructions for converting between i64 and fp.
setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
// This is just the low 32 bits of a (signed) fp->i64 conversion.
// We cannot do this with Promote because i64 is not a legal type.
setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
if (PPCSubTarget.hasLFIWAX() || Subtarget->isPPC64())
setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
} else {
// PowerPC does not have FP_TO_UINT on 32-bit implementations.
setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
}
// With the instructions enabled under FPCVT, we can do everything.
if (PPCSubTarget.hasFPCVT()) {
if (Subtarget->has64BitSupport()) {
setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
setOperationAction(ISD::FP_TO_UINT, MVT::i64, Custom);
setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
setOperationAction(ISD::UINT_TO_FP, MVT::i64, Custom);
}
setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
}
if (Subtarget->use64BitRegs()) {
// 64-bit PowerPC implementations can support i64 types directly
addRegisterClass(MVT::i64, &PPC::G8RCRegClass);
// BUILD_PAIR can't be handled natively, and should be expanded to shl/or
setOperationAction(ISD::BUILD_PAIR, MVT::i64, Expand);
// 64-bit PowerPC wants to expand i128 shifts itself.
setOperationAction(ISD::SHL_PARTS, MVT::i64, Custom);
setOperationAction(ISD::SRA_PARTS, MVT::i64, Custom);
setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
} else {
// 32-bit PowerPC wants to expand i64 shifts itself.
setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
}
if (Subtarget->hasAltivec()) {
// First set operation action for all vector types to expand. Then we
// will selectively turn on ones that can be effectively codegen'd.
for (unsigned i = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
i <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++i) {
MVT::SimpleValueType VT = (MVT::SimpleValueType)i;
// add/sub are legal for all supported vector VT's.
setOperationAction(ISD::ADD , VT, Legal);
setOperationAction(ISD::SUB , VT, Legal);
// We promote all shuffles to v16i8.
setOperationAction(ISD::VECTOR_SHUFFLE, VT, Promote);
AddPromotedToType (ISD::VECTOR_SHUFFLE, VT, MVT::v16i8);
// We promote all non-typed operations to v4i32.
setOperationAction(ISD::AND , VT, Promote);
AddPromotedToType (ISD::AND , VT, MVT::v4i32);
setOperationAction(ISD::OR , VT, Promote);
AddPromotedToType (ISD::OR , VT, MVT::v4i32);
setOperationAction(ISD::XOR , VT, Promote);
AddPromotedToType (ISD::XOR , VT, MVT::v4i32);
setOperationAction(ISD::LOAD , VT, Promote);
AddPromotedToType (ISD::LOAD , VT, MVT::v4i32);
setOperationAction(ISD::SELECT, VT, Promote);
AddPromotedToType (ISD::SELECT, VT, MVT::v4i32);
setOperationAction(ISD::STORE, VT, Promote);
AddPromotedToType (ISD::STORE, VT, MVT::v4i32);
// No other operations are legal.
setOperationAction(ISD::MUL , VT, Expand);
setOperationAction(ISD::SDIV, VT, Expand);
setOperationAction(ISD::SREM, VT, Expand);
setOperationAction(ISD::UDIV, VT, Expand);
setOperationAction(ISD::UREM, VT, Expand);
setOperationAction(ISD::FDIV, VT, Expand);
setOperationAction(ISD::FNEG, VT, Expand);
setOperationAction(ISD::FSQRT, VT, Expand);
setOperationAction(ISD::FLOG, VT, Expand);
setOperationAction(ISD::FLOG10, VT, Expand);
setOperationAction(ISD::FLOG2, VT, Expand);
setOperationAction(ISD::FEXP, VT, Expand);
setOperationAction(ISD::FEXP2, VT, Expand);
setOperationAction(ISD::FSIN, VT, Expand);
setOperationAction(ISD::FCOS, VT, Expand);
setOperationAction(ISD::FABS, VT, Expand);
setOperationAction(ISD::FPOWI, VT, Expand);
setOperationAction(ISD::FFLOOR, VT, Expand);
setOperationAction(ISD::FCEIL, VT, Expand);
setOperationAction(ISD::FTRUNC, VT, Expand);
setOperationAction(ISD::FRINT, VT, Expand);
setOperationAction(ISD::FNEARBYINT, VT, Expand);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Expand);
setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Expand);
setOperationAction(ISD::BUILD_VECTOR, VT, Expand);
setOperationAction(ISD::UMUL_LOHI, VT, Expand);
setOperationAction(ISD::SMUL_LOHI, VT, Expand);
setOperationAction(ISD::UDIVREM, VT, Expand);
setOperationAction(ISD::SDIVREM, VT, Expand);
setOperationAction(ISD::SCALAR_TO_VECTOR, VT, Expand);
setOperationAction(ISD::FPOW, VT, Expand);
setOperationAction(ISD::CTPOP, VT, Expand);
setOperationAction(ISD::CTLZ, VT, Expand);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, VT, Expand);
setOperationAction(ISD::CTTZ, VT, Expand);
setOperationAction(ISD::CTTZ_ZERO_UNDEF, VT, Expand);
setOperationAction(ISD::VSELECT, VT, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, VT, Expand);
for (unsigned j = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
j <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++j) {
MVT::SimpleValueType InnerVT = (MVT::SimpleValueType)j;
setTruncStoreAction(VT, InnerVT, Expand);
}
setLoadExtAction(ISD::SEXTLOAD, VT, Expand);
setLoadExtAction(ISD::ZEXTLOAD, VT, Expand);
setLoadExtAction(ISD::EXTLOAD, VT, Expand);
}
// We can custom expand all VECTOR_SHUFFLEs to VPERM, others we can handle
// with merges, splats, etc.
setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i8, Custom);
setOperationAction(ISD::AND , MVT::v4i32, Legal);
setOperationAction(ISD::OR , MVT::v4i32, Legal);
setOperationAction(ISD::XOR , MVT::v4i32, Legal);
setOperationAction(ISD::LOAD , MVT::v4i32, Legal);
setOperationAction(ISD::SELECT, MVT::v4i32, Expand);
setOperationAction(ISD::STORE , MVT::v4i32, Legal);
setOperationAction(ISD::FP_TO_SINT, MVT::v4i32, Legal);
setOperationAction(ISD::FP_TO_UINT, MVT::v4i32, Legal);
setOperationAction(ISD::SINT_TO_FP, MVT::v4i32, Legal);
setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Legal);
setOperationAction(ISD::FFLOOR, MVT::v4f32, Legal);
setOperationAction(ISD::FCEIL, MVT::v4f32, Legal);
setOperationAction(ISD::FTRUNC, MVT::v4f32, Legal);
setOperationAction(ISD::FNEARBYINT, MVT::v4f32, Legal);
addRegisterClass(MVT::v4f32, &PPC::VRRCRegClass);
addRegisterClass(MVT::v4i32, &PPC::VRRCRegClass);
addRegisterClass(MVT::v8i16, &PPC::VRRCRegClass);
addRegisterClass(MVT::v16i8, &PPC::VRRCRegClass);
setOperationAction(ISD::MUL, MVT::v4f32, Legal);
setOperationAction(ISD::FMA, MVT::v4f32, Legal);
if (TM.Options.UnsafeFPMath) {
setOperationAction(ISD::FDIV, MVT::v4f32, Legal);
setOperationAction(ISD::FSQRT, MVT::v4f32, Legal);
}
setOperationAction(ISD::MUL, MVT::v4i32, Custom);
setOperationAction(ISD::MUL, MVT::v8i16, Custom);
setOperationAction(ISD::MUL, MVT::v16i8, Custom);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Custom);
setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v16i8, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v8i16, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4i32, Custom);
setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
// Altivec does not contain unordered floating-point compare instructions
setCondCodeAction(ISD::SETUO, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETUEQ, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETUGT, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETUGE, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETULT, MVT::v4f32, Expand);
setCondCodeAction(ISD::SETULE, MVT::v4f32, Expand);
}
if (Subtarget->has64BitSupport()) {
setOperationAction(ISD::PREFETCH, MVT::Other, Legal);
setOperationAction(ISD::READCYCLECOUNTER, MVT::i64, Legal);
}
setOperationAction(ISD::ATOMIC_LOAD, MVT::i32, Expand);
setOperationAction(ISD::ATOMIC_STORE, MVT::i32, Expand);
setOperationAction(ISD::ATOMIC_LOAD, MVT::i64, Expand);
setOperationAction(ISD::ATOMIC_STORE, MVT::i64, Expand);
setBooleanContents(ZeroOrOneBooleanContent);
// Altivec instructions set fields to all zeros or all ones.
setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
if (isPPC64) {
setStackPointerRegisterToSaveRestore(PPC::X1);
setExceptionPointerRegister(PPC::X3);
setExceptionSelectorRegister(PPC::X4);
} else {
setStackPointerRegisterToSaveRestore(PPC::R1);
setExceptionPointerRegister(PPC::R3);
setExceptionSelectorRegister(PPC::R4);
}
// We have target-specific dag combine patterns for the following nodes:
setTargetDAGCombine(ISD::SINT_TO_FP);
setTargetDAGCombine(ISD::LOAD);
setTargetDAGCombine(ISD::STORE);
setTargetDAGCombine(ISD::BR_CC);
setTargetDAGCombine(ISD::BSWAP);
setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
// Use reciprocal estimates.
if (TM.Options.UnsafeFPMath) {
setTargetDAGCombine(ISD::FDIV);
setTargetDAGCombine(ISD::FSQRT);
}
// Darwin long double math library functions have $LDBL128 appended.
if (Subtarget->isDarwin()) {
setLibcallName(RTLIB::COS_PPCF128, "cosl$LDBL128");
setLibcallName(RTLIB::POW_PPCF128, "powl$LDBL128");
setLibcallName(RTLIB::REM_PPCF128, "fmodl$LDBL128");
setLibcallName(RTLIB::SIN_PPCF128, "sinl$LDBL128");
setLibcallName(RTLIB::SQRT_PPCF128, "sqrtl$LDBL128");
setLibcallName(RTLIB::LOG_PPCF128, "logl$LDBL128");
setLibcallName(RTLIB::LOG2_PPCF128, "log2l$LDBL128");
setLibcallName(RTLIB::LOG10_PPCF128, "log10l$LDBL128");
setLibcallName(RTLIB::EXP_PPCF128, "expl$LDBL128");
setLibcallName(RTLIB::EXP2_PPCF128, "exp2l$LDBL128");
}
setMinFunctionAlignment(2);
if (PPCSubTarget.isDarwin())
setPrefFunctionAlignment(4);
if (isPPC64 && Subtarget->isJITCodeModel())
// Temporary workaround for the inability of PPC64 JIT to handle jump
// tables.
setSupportJumpTables(false);
setInsertFencesForAtomic(true);
setSchedulingPreference(Sched::Hybrid);
computeRegisterProperties();
// The Freescale cores does better with aggressive inlining of memcpy and
// friends. Gcc uses same threshold of 128 bytes (= 32 word stores).
if (Subtarget->getDarwinDirective() == PPC::DIR_E500mc ||
Subtarget->getDarwinDirective() == PPC::DIR_E5500) {
MaxStoresPerMemset = 32;
MaxStoresPerMemsetOptSize = 16;
MaxStoresPerMemcpy = 32;
MaxStoresPerMemcpyOptSize = 8;
MaxStoresPerMemmove = 32;
MaxStoresPerMemmoveOptSize = 8;
setPrefFunctionAlignment(4);
}
}
/// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
/// function arguments in the caller parameter area.
unsigned PPCTargetLowering::getByValTypeAlignment(Type *Ty) const {
const TargetMachine &TM = getTargetMachine();
// Darwin passes everything on 4 byte boundary.
if (TM.getSubtarget<PPCSubtarget>().isDarwin())
return 4;
// 16byte and wider vectors are passed on 16byte boundary.
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
if (VTy->getBitWidth() >= 128)
return 16;
// The rest is 8 on PPC64 and 4 on PPC32 boundary.
if (PPCSubTarget.isPPC64())
return 8;
return 4;
}
const char *PPCTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return 0;
case PPCISD::FSEL: return "PPCISD::FSEL";
case PPCISD::FCFID: return "PPCISD::FCFID";
case PPCISD::FCTIDZ: return "PPCISD::FCTIDZ";
case PPCISD::FCTIWZ: return "PPCISD::FCTIWZ";
case PPCISD::FRE: return "PPCISD::FRE";
case PPCISD::FRSQRTE: return "PPCISD::FRSQRTE";
case PPCISD::STFIWX: return "PPCISD::STFIWX";
case PPCISD::VMADDFP: return "PPCISD::VMADDFP";
case PPCISD::VNMSUBFP: return "PPCISD::VNMSUBFP";
case PPCISD::VPERM: return "PPCISD::VPERM";
case PPCISD::Hi: return "PPCISD::Hi";
case PPCISD::Lo: return "PPCISD::Lo";
case PPCISD::TOC_ENTRY: return "PPCISD::TOC_ENTRY";
case PPCISD::TOC_RESTORE: return "PPCISD::TOC_RESTORE";
case PPCISD::LOAD: return "PPCISD::LOAD";
case PPCISD::LOAD_TOC: return "PPCISD::LOAD_TOC";
case PPCISD::DYNALLOC: return "PPCISD::DYNALLOC";
case PPCISD::GlobalBaseReg: return "PPCISD::GlobalBaseReg";
case PPCISD::SRL: return "PPCISD::SRL";
case PPCISD::SRA: return "PPCISD::SRA";
case PPCISD::SHL: return "PPCISD::SHL";
case PPCISD::CALL: return "PPCISD::CALL";
case PPCISD::CALL_NOP: return "PPCISD::CALL_NOP";
case PPCISD::MTCTR: return "PPCISD::MTCTR";
case PPCISD::BCTRL: return "PPCISD::BCTRL";
case PPCISD::RET_FLAG: return "PPCISD::RET_FLAG";
case PPCISD::EH_SJLJ_SETJMP: return "PPCISD::EH_SJLJ_SETJMP";
case PPCISD::EH_SJLJ_LONGJMP: return "PPCISD::EH_SJLJ_LONGJMP";
case PPCISD::MFOCRF: return "PPCISD::MFOCRF";
case PPCISD::VCMP: return "PPCISD::VCMP";
case PPCISD::VCMPo: return "PPCISD::VCMPo";
case PPCISD::LBRX: return "PPCISD::LBRX";
case PPCISD::STBRX: return "PPCISD::STBRX";
case PPCISD::LARX: return "PPCISD::LARX";
case PPCISD::STCX: return "PPCISD::STCX";
case PPCISD::COND_BRANCH: return "PPCISD::COND_BRANCH";
case PPCISD::BDNZ: return "PPCISD::BDNZ";
case PPCISD::BDZ: return "PPCISD::BDZ";
case PPCISD::MFFS: return "PPCISD::MFFS";
case PPCISD::FADDRTZ: return "PPCISD::FADDRTZ";
case PPCISD::TC_RETURN: return "PPCISD::TC_RETURN";
case PPCISD::CR6SET: return "PPCISD::CR6SET";
case PPCISD::CR6UNSET: return "PPCISD::CR6UNSET";
case PPCISD::ADDIS_TOC_HA: return "PPCISD::ADDIS_TOC_HA";
case PPCISD::LD_TOC_L: return "PPCISD::LD_TOC_L";
case PPCISD::ADDI_TOC_L: return "PPCISD::ADDI_TOC_L";
case PPCISD::ADDIS_GOT_TPREL_HA: return "PPCISD::ADDIS_GOT_TPREL_HA";
case PPCISD::LD_GOT_TPREL_L: return "PPCISD::LD_GOT_TPREL_L";
case PPCISD::ADD_TLS: return "PPCISD::ADD_TLS";
case PPCISD::ADDIS_TLSGD_HA: return "PPCISD::ADDIS_TLSGD_HA";
case PPCISD::ADDI_TLSGD_L: return "PPCISD::ADDI_TLSGD_L";
case PPCISD::GET_TLS_ADDR: return "PPCISD::GET_TLS_ADDR";
case PPCISD::ADDIS_TLSLD_HA: return "PPCISD::ADDIS_TLSLD_HA";
case PPCISD::ADDI_TLSLD_L: return "PPCISD::ADDI_TLSLD_L";
case PPCISD::GET_TLSLD_ADDR: return "PPCISD::GET_TLSLD_ADDR";
case PPCISD::ADDIS_DTPREL_HA: return "PPCISD::ADDIS_DTPREL_HA";
case PPCISD::ADDI_DTPREL_L: return "PPCISD::ADDI_DTPREL_L";
case PPCISD::VADD_SPLAT: return "PPCISD::VADD_SPLAT";
case PPCISD::SC: return "PPCISD::SC";
}
}
EVT PPCTargetLowering::getSetCCResultType(LLVMContext &, EVT VT) const {
if (!VT.isVector())
return MVT::i32;
return VT.changeVectorElementTypeToInteger();
}
//===----------------------------------------------------------------------===//
// Node matching predicates, for use by the tblgen matching code.
//===----------------------------------------------------------------------===//
/// isFloatingPointZero - Return true if this is 0.0 or -0.0.
static bool isFloatingPointZero(SDValue Op) {
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
return CFP->getValueAPF().isZero();
else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
// Maybe this has already been legalized into the constant pool?
if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op.getOperand(1)))
if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
return CFP->getValueAPF().isZero();
}
return false;
}
/// isConstantOrUndef - Op is either an undef node or a ConstantSDNode. Return
/// true if Op is undef or if it matches the specified value.
static bool isConstantOrUndef(int Op, int Val) {
return Op < 0 || Op == Val;
}
/// isVPKUHUMShuffleMask - Return true if this is the shuffle mask for a
/// VPKUHUM instruction.
bool PPC::isVPKUHUMShuffleMask(ShuffleVectorSDNode *N, bool isUnary) {
if (!isUnary) {
for (unsigned i = 0; i != 16; ++i)
if (!isConstantOrUndef(N->getMaskElt(i), i*2+1))
return false;
} else {
for (unsigned i = 0; i != 8; ++i)
if (!isConstantOrUndef(N->getMaskElt(i), i*2+1) ||
!isConstantOrUndef(N->getMaskElt(i+8), i*2+1))
return false;
}
return true;
}
/// isVPKUWUMShuffleMask - Return true if this is the shuffle mask for a
/// VPKUWUM instruction.
bool PPC::isVPKUWUMShuffleMask(ShuffleVectorSDNode *N, bool isUnary) {
if (!isUnary) {
for (unsigned i = 0; i != 16; i += 2)
if (!isConstantOrUndef(N->getMaskElt(i ), i*2+2) ||
!isConstantOrUndef(N->getMaskElt(i+1), i*2+3))
return false;
} else {
for (unsigned i = 0; i != 8; i += 2)
if (!isConstantOrUndef(N->getMaskElt(i ), i*2+2) ||
!isConstantOrUndef(N->getMaskElt(i+1), i*2+3) ||
!isConstantOrUndef(N->getMaskElt(i+8), i*2+2) ||
!isConstantOrUndef(N->getMaskElt(i+9), i*2+3))
return false;
}
return true;
}
/// isVMerge - Common function, used to match vmrg* shuffles.
///
static bool isVMerge(ShuffleVectorSDNode *N, unsigned UnitSize,
unsigned LHSStart, unsigned RHSStart) {
assert(N->getValueType(0) == MVT::v16i8 &&
"PPC only supports shuffles by bytes!");
assert((UnitSize == 1 || UnitSize == 2 || UnitSize == 4) &&
"Unsupported merge size!");
for (unsigned i = 0; i != 8/UnitSize; ++i) // Step over units
for (unsigned j = 0; j != UnitSize; ++j) { // Step over bytes within unit
if (!isConstantOrUndef(N->getMaskElt(i*UnitSize*2+j),
LHSStart+j+i*UnitSize) ||
!isConstantOrUndef(N->getMaskElt(i*UnitSize*2+UnitSize+j),
RHSStart+j+i*UnitSize))
return false;
}
return true;
}
/// isVMRGLShuffleMask - Return true if this is a shuffle mask suitable for
/// a VRGL* instruction with the specified unit size (1,2 or 4 bytes).
bool PPC::isVMRGLShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
bool isUnary) {
if (!isUnary)
return isVMerge(N, UnitSize, 8, 24);
return isVMerge(N, UnitSize, 8, 8);
}
/// isVMRGHShuffleMask - Return true if this is a shuffle mask suitable for
/// a VRGH* instruction with the specified unit size (1,2 or 4 bytes).
bool PPC::isVMRGHShuffleMask(ShuffleVectorSDNode *N, unsigned UnitSize,
bool isUnary) {
if (!isUnary)
return isVMerge(N, UnitSize, 0, 16);
return isVMerge(N, UnitSize, 0, 0);
}
/// isVSLDOIShuffleMask - If this is a vsldoi shuffle mask, return the shift
/// amount, otherwise return -1.
int PPC::isVSLDOIShuffleMask(SDNode *N, bool isUnary) {
assert(N->getValueType(0) == MVT::v16i8 &&
"PPC only supports shuffles by bytes!");
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
// Find the first non-undef value in the shuffle mask.
unsigned i;
for (i = 0; i != 16 && SVOp->getMaskElt(i) < 0; ++i)
/*search*/;
if (i == 16) return -1; // all undef.
// Otherwise, check to see if the rest of the elements are consecutively
// numbered from this value.
unsigned ShiftAmt = SVOp->getMaskElt(i);
if (ShiftAmt < i) return -1;
ShiftAmt -= i;
if (!isUnary) {
// Check the rest of the elements to see if they are consecutive.
for (++i; i != 16; ++i)
if (!isConstantOrUndef(SVOp->getMaskElt(i), ShiftAmt+i))
return -1;
} else {
// Check the rest of the elements to see if they are consecutive.
for (++i; i != 16; ++i)
if (!isConstantOrUndef(SVOp->getMaskElt(i), (ShiftAmt+i) & 15))
return -1;
}
return ShiftAmt;
}
/// isSplatShuffleMask - Return true if the specified VECTOR_SHUFFLE operand
/// specifies a splat of a single element that is suitable for input to
/// VSPLTB/VSPLTH/VSPLTW.
bool PPC::isSplatShuffleMask(ShuffleVectorSDNode *N, unsigned EltSize) {
assert(N->getValueType(0) == MVT::v16i8 &&
(EltSize == 1 || EltSize == 2 || EltSize == 4));
// This is a splat operation if each element of the permute is the same, and
// if the value doesn't reference the second vector.
unsigned ElementBase = N->getMaskElt(0);
// FIXME: Handle UNDEF elements too!
if (ElementBase >= 16)
return false;
// Check that the indices are consecutive, in the case of a multi-byte element
// splatted with a v16i8 mask.
for (unsigned i = 1; i != EltSize; ++i)
if (N->getMaskElt(i) < 0 || N->getMaskElt(i) != (int)(i+ElementBase))
return false;
for (unsigned i = EltSize, e = 16; i != e; i += EltSize) {
if (N->getMaskElt(i) < 0) continue;
for (unsigned j = 0; j != EltSize; ++j)
if (N->getMaskElt(i+j) != N->getMaskElt(j))
return false;
}
return true;
}
/// isAllNegativeZeroVector - Returns true if all elements of build_vector
/// are -0.0.
bool PPC::isAllNegativeZeroVector(SDNode *N) {
BuildVectorSDNode *BV = cast<BuildVectorSDNode>(N);
APInt APVal, APUndef;
unsigned BitSize;
bool HasAnyUndefs;
if (BV->isConstantSplat(APVal, APUndef, BitSize, HasAnyUndefs, 32, true))
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
return CFP->getValueAPF().isNegZero();
return false;
}
/// getVSPLTImmediate - Return the appropriate VSPLT* immediate to splat the
/// specified isSplatShuffleMask VECTOR_SHUFFLE mask.
unsigned PPC::getVSPLTImmediate(SDNode *N, unsigned EltSize) {
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
assert(isSplatShuffleMask(SVOp, EltSize));
return SVOp->getMaskElt(0) / EltSize;
}
/// get_VSPLTI_elt - If this is a build_vector of constants which can be formed
/// by using a vspltis[bhw] instruction of the specified element size, return
/// the constant being splatted. The ByteSize field indicates the number of
/// bytes of each element [124] -> [bhw].
SDValue PPC::get_VSPLTI_elt(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
SDValue OpVal(0, 0);
// If ByteSize of the splat is bigger than the element size of the
// build_vector, then we have a case where we are checking for a splat where
// multiple elements of the buildvector are folded together into a single
// logical element of the splat (e.g. "vsplish 1" to splat {0,1}*8).
unsigned EltSize = 16/N->getNumOperands();
if (EltSize < ByteSize) {
unsigned Multiple = ByteSize/EltSize; // Number of BV entries per spltval.
SDValue UniquedVals[4];
assert(Multiple > 1 && Multiple <= 4 && "How can this happen?");
// See if all of the elements in the buildvector agree across.
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
// If the element isn't a constant, bail fully out.
if (!isa<ConstantSDNode>(N->getOperand(i))) return SDValue();
if (UniquedVals[i&(Multiple-1)].getNode() == 0)
UniquedVals[i&(Multiple-1)] = N->getOperand(i);
else if (UniquedVals[i&(Multiple-1)] != N->getOperand(i))
return SDValue(); // no match.
}
// Okay, if we reached this point, UniquedVals[0..Multiple-1] contains
// either constant or undef values that are identical for each chunk. See
// if these chunks can form into a larger vspltis*.
// Check to see if all of the leading entries are either 0 or -1. If
// neither, then this won't fit into the immediate field.
bool LeadingZero = true;
bool LeadingOnes = true;
for (unsigned i = 0; i != Multiple-1; ++i) {
if (UniquedVals[i].getNode() == 0) continue; // Must have been undefs.
LeadingZero &= cast<ConstantSDNode>(UniquedVals[i])->isNullValue();
LeadingOnes &= cast<ConstantSDNode>(UniquedVals[i])->isAllOnesValue();
}
// Finally, check the least significant entry.
if (LeadingZero) {
if (UniquedVals[Multiple-1].getNode() == 0)
return DAG.getTargetConstant(0, MVT::i32); // 0,0,0,undef
int Val = cast<ConstantSDNode>(UniquedVals[Multiple-1])->getZExtValue();
if (Val < 16)
return DAG.getTargetConstant(Val, MVT::i32); // 0,0,0,4 -> vspltisw(4)
}
if (LeadingOnes) {
if (UniquedVals[Multiple-1].getNode() == 0)
return DAG.getTargetConstant(~0U, MVT::i32); // -1,-1,-1,undef
int Val =cast<ConstantSDNode>(UniquedVals[Multiple-1])->getSExtValue();
if (Val >= -16) // -1,-1,-1,-2 -> vspltisw(-2)
return DAG.getTargetConstant(Val, MVT::i32);
}
return SDValue();
}
// Check to see if this buildvec has a single non-undef value in its elements.
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
if (N->getOperand(i).getOpcode() == ISD::UNDEF) continue;
if (OpVal.getNode() == 0)
OpVal = N->getOperand(i);
else if (OpVal != N->getOperand(i))
return SDValue();
}
if (OpVal.getNode() == 0) return SDValue(); // All UNDEF: use implicit def.
unsigned ValSizeInBytes = EltSize;
uint64_t Value = 0;
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal)) {
Value = CN->getZExtValue();
} else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal)) {
assert(CN->getValueType(0) == MVT::f32 && "Only one legal FP vector type!");
Value = FloatToBits(CN->getValueAPF().convertToFloat());
}
// If the splat value is larger than the element value, then we can never do
// this splat. The only case that we could fit the replicated bits into our
// immediate field for would be zero, and we prefer to use vxor for it.
if (ValSizeInBytes < ByteSize) return SDValue();
// If the element value is larger than the splat value, cut it in half and
// check to see if the two halves are equal. Continue doing this until we
// get to ByteSize. This allows us to handle 0x01010101 as 0x01.
while (ValSizeInBytes > ByteSize) {
ValSizeInBytes >>= 1;
// If the top half equals the bottom half, we're still ok.
if (((Value >> (ValSizeInBytes*8)) & ((1 << (8*ValSizeInBytes))-1)) !=
(Value & ((1 << (8*ValSizeInBytes))-1)))
return SDValue();
}
// Properly sign extend the value.
int MaskVal = SignExtend32(Value, ByteSize * 8);
// If this is zero, don't match, zero matches ISD::isBuildVectorAllZeros.
if (MaskVal == 0) return SDValue();
// Finally, if this value fits in a 5 bit sext field, return it
if (SignExtend32<5>(MaskVal) == MaskVal)
return DAG.getTargetConstant(MaskVal, MVT::i32);
return SDValue();
}
//===----------------------------------------------------------------------===//
// Addressing Mode Selection
//===----------------------------------------------------------------------===//
/// isIntS16Immediate - This method tests to see if the node is either a 32-bit
/// or 64-bit immediate, and if the value can be accurately represented as a
/// sign extension from a 16-bit value. If so, this returns true and the
/// immediate.
static bool isIntS16Immediate(SDNode *N, short &Imm) {
if (N->getOpcode() != ISD::Constant)
return false;
Imm = (short)cast<ConstantSDNode>(N)->getZExtValue();
if (N->getValueType(0) == MVT::i32)
return Imm == (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
else
return Imm == (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
}
static bool isIntS16Immediate(SDValue Op, short &Imm) {
return isIntS16Immediate(Op.getNode(), Imm);
}
/// SelectAddressRegReg - Given the specified addressed, check to see if it
/// can be represented as an indexed [r+r] operation. Returns false if it
/// can be more efficiently represented with [r+imm].
bool PPCTargetLowering::SelectAddressRegReg(SDValue N, SDValue &Base,
SDValue &Index,
SelectionDAG &DAG) const {
short imm = 0;
if (N.getOpcode() == ISD::ADD) {
if (isIntS16Immediate(N.getOperand(1), imm))
return false; // r+i
if (N.getOperand(1).getOpcode() == PPCISD::Lo)
return false; // r+i
Base = N.getOperand(0);
Index = N.getOperand(1);
return true;
} else if (N.getOpcode() == ISD::OR) {
if (isIntS16Immediate(N.getOperand(1), imm))
return false; // r+i can fold it if we can.
// If this is an or of disjoint bitfields, we can codegen this as an add
// (for better address arithmetic) if the LHS and RHS of the OR are provably
// disjoint.
APInt LHSKnownZero, LHSKnownOne;
APInt RHSKnownZero, RHSKnownOne;
DAG.ComputeMaskedBits(N.getOperand(0),
LHSKnownZero, LHSKnownOne);
if (LHSKnownZero.getBoolValue()) {
DAG.ComputeMaskedBits(N.getOperand(1),
RHSKnownZero, RHSKnownOne);
// If all of the bits are known zero on the LHS or RHS, the add won't
// carry.
if (~(LHSKnownZero | RHSKnownZero) == 0) {
Base = N.getOperand(0);
Index = N.getOperand(1);
return true;
}
}
}
return false;
}
/// Returns true if the address N can be represented by a base register plus
/// a signed 16-bit displacement [r+imm], and if it is not better
/// represented as reg+reg. If Aligned is true, only accept displacements
/// suitable for STD and friends, i.e. multiples of 4.
bool PPCTargetLowering::SelectAddressRegImm(SDValue N, SDValue &Disp,
SDValue &Base,
SelectionDAG &DAG,
bool Aligned) const {
// FIXME dl should come from parent load or store, not from address
SDLoc dl(N);
// If this can be more profitably realized as r+r, fail.
if (SelectAddressRegReg(N, Disp, Base, DAG))
return false;
if (N.getOpcode() == ISD::ADD) {
short imm = 0;
if (isIntS16Immediate(N.getOperand(1), imm) &&
(!Aligned || (imm & 3) == 0)) {
Disp = DAG.getTargetConstant(imm, N.getValueType());
if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
} else {
Base = N.getOperand(0);
}
return true; // [r+i]
} else if (N.getOperand(1).getOpcode() == PPCISD::Lo) {
// Match LOAD (ADD (X, Lo(G))).
assert(!cast<ConstantSDNode>(N.getOperand(1).getOperand(1))->getZExtValue()
&& "Cannot handle constant offsets yet!");
Disp = N.getOperand(1).getOperand(0); // The global address.
assert(Disp.getOpcode() == ISD::TargetGlobalAddress ||
Disp.getOpcode() == ISD::TargetGlobalTLSAddress ||
Disp.getOpcode() == ISD::TargetConstantPool ||
Disp.getOpcode() == ISD::TargetJumpTable);
Base = N.getOperand(0);
return true; // [&g+r]
}
} else if (N.getOpcode() == ISD::OR) {
short imm = 0;
if (isIntS16Immediate(N.getOperand(1), imm) &&
(!Aligned || (imm & 3) == 0)) {
// If this is an or of disjoint bitfields, we can codegen this as an add
// (for better address arithmetic) if the LHS and RHS of the OR are
// provably disjoint.
APInt LHSKnownZero, LHSKnownOne;
DAG.ComputeMaskedBits(N.getOperand(0), LHSKnownZero, LHSKnownOne);
if ((LHSKnownZero.getZExtValue()|~(uint64_t)imm) == ~0ULL) {
// If all of the bits are known zero on the LHS or RHS, the add won't
// carry.
Base = N.getOperand(0);
Disp = DAG.getTargetConstant(imm, N.getValueType());
return true;
}
}
} else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N)) {
// Loading from a constant address.
// If this address fits entirely in a 16-bit sext immediate field, codegen
// this as "d, 0"
short Imm;
if (isIntS16Immediate(CN, Imm) && (!Aligned || (Imm & 3) == 0)) {
Disp = DAG.getTargetConstant(Imm, CN->getValueType(0));
Base = DAG.getRegister(PPCSubTarget.isPPC64() ? PPC::ZERO8 : PPC::ZERO,
CN->getValueType(0));
return true;
}
// Handle 32-bit sext immediates with LIS + addr mode.
if ((CN->getValueType(0) == MVT::i32 ||
(int64_t)CN->getZExtValue() == (int)CN->getZExtValue()) &&
(!Aligned || (CN->getZExtValue() & 3) == 0)) {
int Addr = (int)CN->getZExtValue();
// Otherwise, break this down into an LIS + disp.
Disp = DAG.getTargetConstant((short)Addr, MVT::i32);
Base = DAG.getTargetConstant((Addr - (signed short)Addr) >> 16, MVT::i32);
unsigned Opc = CN->getValueType(0) == MVT::i32 ? PPC::LIS : PPC::LIS8;
Base = SDValue(DAG.getMachineNode(Opc, dl, CN->getValueType(0), Base), 0);
return true;
}
}
Disp = DAG.getTargetConstant(0, getPointerTy());
if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
Base = DAG.getTargetFrameIndex(FI->getIndex(), N.getValueType());
else
Base = N;
return true; // [r+0]
}
/// SelectAddressRegRegOnly - Given the specified addressed, force it to be
/// represented as an indexed [r+r] operation.
bool PPCTargetLowering::SelectAddressRegRegOnly(SDValue N, SDValue &Base,
SDValue &Index,
SelectionDAG &DAG) const {
// Check to see if we can easily represent this as an [r+r] address. This
// will fail if it thinks that the address is more profitably represented as
// reg+imm, e.g. where imm = 0.
if (SelectAddressRegReg(N, Base, Index, DAG))
return true;
// If the operand is an addition, always emit this as [r+r], since this is
// better (for code size, and execution, as the memop does the add for free)
// than emitting an explicit add.
if (N.getOpcode() == ISD::ADD) {
Base = N.getOperand(0);
Index = N.getOperand(1);
return true;
}
// Otherwise, do it the hard way, using R0 as the base register.
Base = DAG.getRegister(PPCSubTarget.isPPC64() ? PPC::ZERO8 : PPC::ZERO,
N.getValueType());
Index = N;
return true;
}
/// getPreIndexedAddressParts - returns true by value, base pointer and
/// offset pointer and addressing mode by reference if the node's address
/// can be legally represented as pre-indexed load / store address.
bool PPCTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
SDValue &Offset,
ISD::MemIndexedMode &AM,
SelectionDAG &DAG) const {
if (DisablePPCPreinc) return false;
bool isLoad = true;
SDValue Ptr;
EVT VT;
unsigned Alignment;
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
Ptr = LD->getBasePtr();
VT = LD->getMemoryVT();
Alignment = LD->getAlignment();
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
Ptr = ST->getBasePtr();
VT = ST->getMemoryVT();
Alignment = ST->getAlignment();
isLoad = false;
} else
return false;
// PowerPC doesn't have preinc load/store instructions for vectors.
if (VT.isVector())
return false;
if (SelectAddressRegReg(Ptr, Base, Offset, DAG)) {
// Common code will reject creating a pre-inc form if the base pointer
// is a frame index, or if N is a store and the base pointer is either
// the same as or a predecessor of the value being stored. Check for
// those situations here, and try with swapped Base/Offset instead.
bool Swap = false;
if (isa<FrameIndexSDNode>(Base) || isa<RegisterSDNode>(Base))
Swap = true;
else if (!isLoad) {
SDValue Val = cast<StoreSDNode>(N)->getValue();
if (Val == Base || Base.getNode()->isPredecessorOf(Val.getNode()))
Swap = true;
}
if (Swap)
std::swap(Base, Offset);
AM = ISD::PRE_INC;
return true;
}
// LDU/STU can only handle immediates that are a multiple of 4.
if (VT != MVT::i64) {
if (!SelectAddressRegImm(Ptr, Offset, Base, DAG, false))
return false;
} else {
// LDU/STU need an address with at least 4-byte alignment.
if (Alignment < 4)
return false;
if (!SelectAddressRegImm(Ptr, Offset, Base, DAG, true))
return false;
}
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
// PPC64 doesn't have lwau, but it does have lwaux. Reject preinc load of
// sext i32 to i64 when addr mode is r+i.
if (LD->getValueType(0) == MVT::i64 && LD->getMemoryVT() == MVT::i32 &&
LD->getExtensionType() == ISD::SEXTLOAD &&
isa<ConstantSDNode>(Offset))
return false;
}
AM = ISD::PRE_INC;
return true;
}
//===----------------------------------------------------------------------===//
// LowerOperation implementation
//===----------------------------------------------------------------------===//
/// GetLabelAccessInfo - Return true if we should reference labels using a
/// PICBase, set the HiOpFlags and LoOpFlags to the target MO flags.
static bool GetLabelAccessInfo(const TargetMachine &TM, unsigned &HiOpFlags,
unsigned &LoOpFlags, const GlobalValue *GV = 0) {
HiOpFlags = PPCII::MO_HA;
LoOpFlags = PPCII::MO_LO;
// Don't use the pic base if not in PIC relocation model. Or if we are on a
// non-darwin platform. We don't support PIC on other platforms yet.
bool isPIC = TM.getRelocationModel() == Reloc::PIC_ &&
TM.getSubtarget<PPCSubtarget>().isDarwin();
if (isPIC) {
HiOpFlags |= PPCII::MO_PIC_FLAG;
LoOpFlags |= PPCII::MO_PIC_FLAG;
}
// If this is a reference to a global value that requires a non-lazy-ptr, make
// sure that instruction lowering adds it.
if (GV && TM.getSubtarget<PPCSubtarget>().hasLazyResolverStub(GV, TM)) {
HiOpFlags |= PPCII::MO_NLP_FLAG;
LoOpFlags |= PPCII::MO_NLP_FLAG;
if (GV->hasHiddenVisibility()) {
HiOpFlags |= PPCII::MO_NLP_HIDDEN_FLAG;
LoOpFlags |= PPCII::MO_NLP_HIDDEN_FLAG;
}
}
return isPIC;
}
static SDValue LowerLabelRef(SDValue HiPart, SDValue LoPart, bool isPIC,
SelectionDAG &DAG) {
EVT PtrVT = HiPart.getValueType();
SDValue Zero = DAG.getConstant(0, PtrVT);
SDLoc DL(HiPart);
SDValue Hi = DAG.getNode(PPCISD::Hi, DL, PtrVT, HiPart, Zero);
SDValue Lo = DAG.getNode(PPCISD::Lo, DL, PtrVT, LoPart, Zero);
// With PIC, the first instruction is actually "GR+hi(&G)".
if (isPIC)
Hi = DAG.getNode(ISD::ADD, DL, PtrVT,
DAG.getNode(PPCISD::GlobalBaseReg, DL, PtrVT), Hi);
// Generate non-pic code that has direct accesses to the constant pool.
// The address of the global is just (hi(&g)+lo(&g)).
return DAG.getNode(ISD::ADD, DL, PtrVT, Hi, Lo);
}
SDValue PPCTargetLowering::LowerConstantPool(SDValue Op,
SelectionDAG &DAG) const {
EVT PtrVT = Op.getValueType();
ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
const Constant *C = CP->getConstVal();
// 64-bit SVR4 ABI code is always position-independent.
// The actual address of the GlobalValue is stored in the TOC.
if (PPCSubTarget.isSVR4ABI() && PPCSubTarget.isPPC64()) {
SDValue GA = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment(), 0);
return DAG.getNode(PPCISD::TOC_ENTRY, SDLoc(CP), MVT::i64, GA,
DAG.getRegister(PPC::X2, MVT::i64));
}
unsigned MOHiFlag, MOLoFlag;
bool isPIC = GetLabelAccessInfo(DAG.getTarget(), MOHiFlag, MOLoFlag);
SDValue CPIHi =
DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment(), 0, MOHiFlag);
SDValue CPILo =
DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment(), 0, MOLoFlag);
return LowerLabelRef(CPIHi, CPILo, isPIC, DAG);
}
SDValue PPCTargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) const {
EVT PtrVT = Op.getValueType();
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
// 64-bit SVR4 ABI code is always position-independent.
// The actual address of the GlobalValue is stored in the TOC.
if (PPCSubTarget.isSVR4ABI() && PPCSubTarget.isPPC64()) {
SDValue GA = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
return DAG.getNode(PPCISD::TOC_ENTRY, SDLoc(JT), MVT::i64, GA,
DAG.getRegister(PPC::X2, MVT::i64));
}
unsigned MOHiFlag, MOLoFlag;
bool isPIC = GetLabelAccessInfo(DAG.getTarget(), MOHiFlag, MOLoFlag);
SDValue JTIHi = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MOHiFlag);
SDValue JTILo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, MOLoFlag);
return LowerLabelRef(JTIHi, JTILo, isPIC, DAG);
}
SDValue PPCTargetLowering::LowerBlockAddress(SDValue Op,
SelectionDAG &DAG) const {
EVT PtrVT = Op.getValueType();
const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
unsigned MOHiFlag, MOLoFlag;
bool isPIC = GetLabelAccessInfo(DAG.getTarget(), MOHiFlag, MOLoFlag);
SDValue TgtBAHi = DAG.getTargetBlockAddress(BA, PtrVT, 0, MOHiFlag);
SDValue TgtBALo = DAG.getTargetBlockAddress(BA, PtrVT, 0, MOLoFlag);
return LowerLabelRef(TgtBAHi, TgtBALo, isPIC, DAG);
}
SDValue PPCTargetLowering::LowerGlobalTLSAddress(SDValue Op,
SelectionDAG &DAG) const {
GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
SDLoc dl(GA);
const GlobalValue *GV = GA->getGlobal();
EVT PtrVT = getPointerTy();
bool is64bit = PPCSubTarget.isPPC64();
TLSModel::Model Model = getTargetMachine().getTLSModel(GV);
if (Model == TLSModel::LocalExec) {
SDValue TGAHi = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
PPCII::MO_TPREL_HA);
SDValue TGALo = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0,
PPCII::MO_TPREL_LO);
SDValue TLSReg = DAG.getRegister(is64bit ? PPC::X13 : PPC::R2,
is64bit ? MVT::i64 : MVT::i32);
SDValue Hi = DAG.getNode(PPCISD::Hi, dl, PtrVT, TGAHi, TLSReg);
return DAG.getNode(PPCISD::Lo, dl, PtrVT, TGALo, Hi);
}
if (!is64bit)
llvm_unreachable("only local-exec is currently supported for ppc32");
if (Model == TLSModel::InitialExec) {
SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, 0);
SDValue GOTReg = DAG.getRegister(PPC::X2, MVT::i64);
SDValue TPOffsetHi = DAG.getNode(PPCISD::ADDIS_GOT_TPREL_HA, dl,
PtrVT, GOTReg, TGA);
SDValue TPOffset = DAG.getNode(PPCISD::LD_GOT_TPREL_L, dl,
PtrVT, TGA, TPOffsetHi);
return DAG.getNode(PPCISD::ADD_TLS, dl, PtrVT, TPOffset, TGA);
}
if (Model == TLSModel::GeneralDynamic) {
SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, 0);
SDValue GOTReg = DAG.getRegister(PPC::X2, MVT::i64);
SDValue GOTEntryHi = DAG.getNode(PPCISD::ADDIS_TLSGD_HA, dl, PtrVT,
GOTReg, TGA);
SDValue GOTEntry = DAG.getNode(PPCISD::ADDI_TLSGD_L, dl, PtrVT,
GOTEntryHi, TGA);
// We need a chain node, and don't have one handy. The underlying
// call has no side effects, so using the function entry node
// suffices.
SDValue Chain = DAG.getEntryNode();
Chain = DAG.getCopyToReg(Chain, dl, PPC::X3, GOTEntry);
SDValue ParmReg = DAG.getRegister(PPC::X3, MVT::i64);
SDValue TLSAddr = DAG.getNode(PPCISD::GET_TLS_ADDR, dl,
PtrVT, ParmReg, TGA);
// The return value from GET_TLS_ADDR really is in X3 already, but
// some hacks are needed here to tie everything together. The extra
// copies dissolve during subsequent transforms.
Chain = DAG.getCopyToReg(Chain, dl, PPC::X3, TLSAddr);
return DAG.getCopyFromReg(Chain, dl, PPC::X3, PtrVT);
}
if (Model == TLSModel::LocalDynamic) {
SDValue TGA = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, 0);
SDValue GOTReg = DAG.getRegister(PPC::X2, MVT::i64);
SDValue GOTEntryHi = DAG.getNode(PPCISD::ADDIS_TLSLD_HA, dl, PtrVT,
GOTReg, TGA);
SDValue GOTEntry = DAG.getNode(PPCISD::ADDI_TLSLD_L, dl, PtrVT,
GOTEntryHi, TGA);
// We need a chain node, and don't have one handy. The underlying
// call has no side effects, so using the function entry node
// suffices.
SDValue Chain = DAG.getEntryNode();
Chain = DAG.getCopyToReg(Chain, dl, PPC::X3, GOTEntry);
SDValue ParmReg = DAG.getRegister(PPC::X3, MVT::i64);
SDValue TLSAddr = DAG.getNode(PPCISD::GET_TLSLD_ADDR, dl,
PtrVT, ParmReg, TGA);
// The return value from GET_TLSLD_ADDR really is in X3 already, but
// some hacks are needed here to tie everything together. The extra
// copies dissolve during subsequent transforms.
Chain = DAG.getCopyToReg(Chain, dl, PPC::X3, TLSAddr);
SDValue DtvOffsetHi = DAG.getNode(PPCISD::ADDIS_DTPREL_HA, dl, PtrVT,
Chain, ParmReg, TGA);
return DAG.getNode(PPCISD::ADDI_DTPREL_L, dl, PtrVT, DtvOffsetHi, TGA);
}
llvm_unreachable("Unknown TLS model!");
}
SDValue PPCTargetLowering::LowerGlobalAddress(SDValue Op,
SelectionDAG &DAG) const {
EVT PtrVT = Op.getValueType();
GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
SDLoc DL(GSDN);
const GlobalValue *GV = GSDN->getGlobal();
// 64-bit SVR4 ABI code is always position-independent.
// The actual address of the GlobalValue is stored in the TOC.
if (PPCSubTarget.isSVR4ABI() && PPCSubTarget.isPPC64()) {
SDValue GA = DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset());
return DAG.getNode(PPCISD::TOC_ENTRY, DL, MVT::i64, GA,
DAG.getRegister(PPC::X2, MVT::i64));
}
unsigned MOHiFlag, MOLoFlag;
bool isPIC = GetLabelAccessInfo(DAG.getTarget(), MOHiFlag, MOLoFlag, GV);
SDValue GAHi =
DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset(), MOHiFlag);
SDValue GALo =
DAG.getTargetGlobalAddress(GV, DL, PtrVT, GSDN->getOffset(), MOLoFlag);
SDValue Ptr = LowerLabelRef(GAHi, GALo, isPIC, DAG);
// If the global reference is actually to a non-lazy-pointer, we have to do an
// extra load to get the address of the global.
if (MOHiFlag & PPCII::MO_NLP_FLAG)
Ptr = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), Ptr, MachinePointerInfo(),
false, false, false, 0);
return Ptr;
}
SDValue PPCTargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
SDLoc dl(Op);
// If we're comparing for equality to zero, expose the fact that this is
// implented as a ctlz/srl pair on ppc, so that the dag combiner can
// fold the new nodes.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
if (C->isNullValue() && CC == ISD::SETEQ) {
EVT VT = Op.getOperand(0).getValueType();
SDValue Zext = Op.getOperand(0);
if (VT.bitsLT(MVT::i32)) {
VT = MVT::i32;
Zext = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, Op.getOperand(0));
}
unsigned Log2b = Log2_32(VT.getSizeInBits());
SDValue Clz = DAG.getNode(ISD::CTLZ, dl, VT, Zext);
SDValue Scc = DAG.getNode(ISD::SRL, dl, VT, Clz,
DAG.getConstant(Log2b, MVT::i32));
return DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Scc);
}
// Leave comparisons against 0 and -1 alone for now, since they're usually
// optimized. FIXME: revisit this when we can custom lower all setcc
// optimizations.
if (C->isAllOnesValue() || C->isNullValue())
return SDValue();
}
// If we have an integer seteq/setne, turn it into a compare against zero
// by xor'ing the rhs with the lhs, which is faster than setting a
// condition register, reading it back out, and masking the correct bit. The
// normal approach here uses sub to do this instead of xor. Using xor exposes
// the result to other bit-twiddling opportunities.
EVT LHSVT = Op.getOperand(0).getValueType();
if (LHSVT.isInteger() && (CC == ISD::SETEQ || CC == ISD::SETNE)) {
EVT VT = Op.getValueType();
SDValue Sub = DAG.getNode(ISD::XOR, dl, LHSVT, Op.getOperand(0),
Op.getOperand(1));
return DAG.getSetCC(dl, VT, Sub, DAG.getConstant(0, LHSVT), CC);
}
return SDValue();
}
SDValue PPCTargetLowering::LowerVAARG(SDValue Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) const {
SDNode *Node = Op.getNode();
EVT VT = Node->getValueType(0);
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
SDValue InChain = Node->getOperand(0);
SDValue VAListPtr = Node->getOperand(1);
const Value *SV = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
SDLoc dl(Node);
assert(!Subtarget.isPPC64() && "LowerVAARG is PPC32 only");
// gpr_index
SDValue GprIndex = DAG.getExtLoad(ISD::ZEXTLOAD, dl, MVT::i32, InChain,
VAListPtr, MachinePointerInfo(SV), MVT::i8,
false, false, 0);
InChain = GprIndex.getValue(1);
if (VT == MVT::i64) {
// Check if GprIndex is even
SDValue GprAnd = DAG.getNode(ISD::AND, dl, MVT::i32, GprIndex,
DAG.getConstant(1, MVT::i32));
SDValue CC64 = DAG.getSetCC(dl, MVT::i32, GprAnd,
DAG.getConstant(0, MVT::i32), ISD::SETNE);
SDValue GprIndexPlusOne = DAG.getNode(ISD::ADD, dl, MVT::i32, GprIndex,
DAG.getConstant(1, MVT::i32));
// Align GprIndex to be even if it isn't
GprIndex = DAG.getNode(ISD::SELECT, dl, MVT::i32, CC64, GprIndexPlusOne,
GprIndex);
}
// fpr index is 1 byte after gpr
SDValue FprPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAListPtr,
DAG.getConstant(1, MVT::i32));
// fpr
SDValue FprIndex = DAG.getExtLoad(ISD::ZEXTLOAD, dl, MVT::i32, InChain,
FprPtr, MachinePointerInfo(SV), MVT::i8,
false, false, 0);
InChain = FprIndex.getValue(1);
SDValue RegSaveAreaPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAListPtr,
DAG.getConstant(8, MVT::i32));
SDValue OverflowAreaPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAListPtr,
DAG.getConstant(4, MVT::i32));
// areas
SDValue OverflowArea = DAG.getLoad(MVT::i32, dl, InChain, OverflowAreaPtr,
MachinePointerInfo(), false, false,
false, 0);
InChain = OverflowArea.getValue(1);
SDValue RegSaveArea = DAG.getLoad(MVT::i32, dl, InChain, RegSaveAreaPtr,
MachinePointerInfo(), false, false,
false, 0);
InChain = RegSaveArea.getValue(1);
// select overflow_area if index > 8
SDValue CC = DAG.getSetCC(dl, MVT::i32, VT.isInteger() ? GprIndex : FprIndex,
DAG.getConstant(8, MVT::i32), ISD::SETLT);
// adjustment constant gpr_index * 4/8
SDValue RegConstant = DAG.getNode(ISD::MUL, dl, MVT::i32,
VT.isInteger() ? GprIndex : FprIndex,
DAG.getConstant(VT.isInteger() ? 4 : 8,
MVT::i32));
// OurReg = RegSaveArea + RegConstant
SDValue OurReg = DAG.getNode(ISD::ADD, dl, PtrVT, RegSaveArea,
RegConstant);
// Floating types are 32 bytes into RegSaveArea
if (VT.isFloatingPoint())
OurReg = DAG.getNode(ISD::ADD, dl, PtrVT, OurReg,
DAG.getConstant(32, MVT::i32));
// increase {f,g}pr_index by 1 (or 2 if VT is i64)
SDValue IndexPlus1 = DAG.getNode(ISD::ADD, dl, MVT::i32,
VT.isInteger() ? GprIndex : FprIndex,
DAG.getConstant(VT == MVT::i64 ? 2 : 1,
MVT::i32));
InChain = DAG.getTruncStore(InChain, dl, IndexPlus1,
VT.isInteger() ? VAListPtr : FprPtr,
MachinePointerInfo(SV),
MVT::i8, false, false, 0);
// determine if we should load from reg_save_area or overflow_area
SDValue Result = DAG.getNode(ISD::SELECT, dl, PtrVT, CC, OurReg, OverflowArea);
// increase overflow_area by 4/8 if gpr/fpr > 8
SDValue OverflowAreaPlusN = DAG.getNode(ISD::ADD, dl, PtrVT, OverflowArea,
DAG.getConstant(VT.isInteger() ? 4 : 8,
MVT::i32));
OverflowArea = DAG.getNode(ISD::SELECT, dl, MVT::i32, CC, OverflowArea,
OverflowAreaPlusN);
InChain = DAG.getTruncStore(InChain, dl, OverflowArea,
OverflowAreaPtr,
MachinePointerInfo(),
MVT::i32, false, false, 0);
return DAG.getLoad(VT, dl, InChain, Result, MachinePointerInfo(),
false, false, false, 0);
}
SDValue PPCTargetLowering::LowerADJUST_TRAMPOLINE(SDValue Op,
SelectionDAG &DAG) const {
return Op.getOperand(0);
}
SDValue PPCTargetLowering::LowerINIT_TRAMPOLINE(SDValue Op,
SelectionDAG &DAG) const {
SDValue Chain = Op.getOperand(0);
SDValue Trmp = Op.getOperand(1); // trampoline
SDValue FPtr = Op.getOperand(2); // nested function
SDValue Nest = Op.getOperand(3); // 'nest' parameter value
SDLoc dl(Op);
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
bool isPPC64 = (PtrVT == MVT::i64);
Type *IntPtrTy =
DAG.getTargetLoweringInfo().getDataLayout()->getIntPtrType(
*DAG.getContext());
TargetLowering::ArgListTy Args;
TargetLowering::ArgListEntry Entry;
Entry.Ty = IntPtrTy;
Entry.Node = Trmp; Args.push_back(Entry);
// TrampSize == (isPPC64 ? 48 : 40);
Entry.Node = DAG.getConstant(isPPC64 ? 48 : 40,
isPPC64 ? MVT::i64 : MVT::i32);
Args.push_back(Entry);
Entry.Node = FPtr; Args.push_back(Entry);
Entry.Node = Nest; Args.push_back(Entry);
// Lower to a call to __trampoline_setup(Trmp, TrampSize, FPtr, ctx_reg)
TargetLowering::CallLoweringInfo CLI(Chain,
Type::getVoidTy(*DAG.getContext()),
false, false, false, false, 0,
CallingConv::C,
/*isTailCall=*/false,
/*doesNotRet=*/false,
/*isReturnValueUsed=*/true,
DAG.getExternalSymbol("__trampoline_setup", PtrVT),
Args, DAG, dl);
std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
return CallResult.second;
}
SDValue PPCTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) const {
MachineFunction &MF = DAG.getMachineFunction();
PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
SDLoc dl(Op);
if (Subtarget.isDarwinABI() || Subtarget.isPPC64()) {
// vastart just stores the address of the VarArgsFrameIndex slot into the
// memory location argument.
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1),
MachinePointerInfo(SV),
false, false, 0);
}
// For the 32-bit SVR4 ABI we follow the layout of the va_list struct.
// We suppose the given va_list is already allocated.
//
// typedef struct {
// char gpr; /* index into the array of 8 GPRs
// * stored in the register save area
// * gpr=0 corresponds to r3,
// * gpr=1 to r4, etc.
// */
// char fpr; /* index into the array of 8 FPRs
// * stored in the register save area
// * fpr=0 corresponds to f1,
// * fpr=1 to f2, etc.
// */
// char *overflow_arg_area;
// /* location on stack that holds
// * the next overflow argument
// */
// char *reg_save_area;
// /* where r3:r10 and f1:f8 (if saved)
// * are stored
// */
// } va_list[1];
SDValue ArgGPR = DAG.getConstant(FuncInfo->getVarArgsNumGPR(), MVT::i32);
SDValue ArgFPR = DAG.getConstant(FuncInfo->getVarArgsNumFPR(), MVT::i32);
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
SDValue StackOffsetFI = DAG.getFrameIndex(FuncInfo->getVarArgsStackOffset(),
PtrVT);
SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(),
PtrVT);
uint64_t FrameOffset = PtrVT.getSizeInBits()/8;
SDValue ConstFrameOffset = DAG.getConstant(FrameOffset, PtrVT);
uint64_t StackOffset = PtrVT.getSizeInBits()/8 - 1;
SDValue ConstStackOffset = DAG.getConstant(StackOffset, PtrVT);
uint64_t FPROffset = 1;
SDValue ConstFPROffset = DAG.getConstant(FPROffset, PtrVT);
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
// Store first byte : number of int regs
SDValue firstStore = DAG.getTruncStore(Op.getOperand(0), dl, ArgGPR,
Op.getOperand(1),
MachinePointerInfo(SV),
MVT::i8, false, false, 0);
uint64_t nextOffset = FPROffset;
SDValue nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, Op.getOperand(1),
ConstFPROffset);
// Store second byte : number of float regs
SDValue secondStore =
DAG.getTruncStore(firstStore, dl, ArgFPR, nextPtr,
MachinePointerInfo(SV, nextOffset), MVT::i8,
false, false, 0);
nextOffset += StackOffset;
nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, nextPtr, ConstStackOffset);
// Store second word : arguments given on stack
SDValue thirdStore =
DAG.getStore(secondStore, dl, StackOffsetFI, nextPtr,
MachinePointerInfo(SV, nextOffset),
false, false, 0);
nextOffset += FrameOffset;
nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, nextPtr, ConstFrameOffset);
// Store third word : arguments given in registers
return DAG.getStore(thirdStore, dl, FR, nextPtr,
MachinePointerInfo(SV, nextOffset),
false, false, 0);
}
#include "PPCGenCallingConv.inc"
bool llvm::CC_PPC32_SVR4_Custom_Dummy(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
CCValAssign::LocInfo &LocInfo,
ISD::ArgFlagsTy &ArgFlags,
CCState &State) {
return true;
}
bool llvm::CC_PPC32_SVR4_Custom_AlignArgRegs(unsigned &ValNo, MVT &ValVT,
MVT &LocVT,
CCValAssign::LocInfo &LocInfo,
ISD::ArgFlagsTy &ArgFlags,
CCState &State) {
static const uint16_t ArgRegs[] = {
PPC::R3, PPC::R4, PPC::R5, PPC::R6,
PPC::R7, PPC::R8, PPC::R9, PPC::R10,
};
const unsigned NumArgRegs = array_lengthof(ArgRegs);
unsigned RegNum = State.getFirstUnallocated(ArgRegs, NumArgRegs);
// Skip one register if the first unallocated register has an even register
// number and there are still argument registers available which have not been
// allocated yet. RegNum is actually an index into ArgRegs, which means we
// need to skip a register if RegNum is odd.
if (RegNum != NumArgRegs && RegNum % 2 == 1) {
State.AllocateReg(ArgRegs[RegNum]);
}
// Always return false here, as this function only makes sure that the first
// unallocated register has an odd register number and does not actually
// allocate a register for the current argument.
return false;
}
bool llvm::CC_PPC32_SVR4_Custom_AlignFPArgRegs(unsigned &ValNo, MVT &ValVT,
MVT &LocVT,
CCValAssign::LocInfo &LocInfo,
ISD::ArgFlagsTy &ArgFlags,
CCState &State) {
static const uint16_t ArgRegs[] = {
PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
PPC::F8
};
const unsigned NumArgRegs = array_lengthof(ArgRegs);
unsigned RegNum = State.getFirstUnallocated(ArgRegs, NumArgRegs);
// If there is only one Floating-point register left we need to put both f64
// values of a split ppc_fp128 value on the stack.
if (RegNum != NumArgRegs && ArgRegs[RegNum] == PPC::F8) {
State.AllocateReg(ArgRegs[RegNum]);
}
// Always return false here, as this function only makes sure that the two f64
// values a ppc_fp128 value is split into are both passed in registers or both
// passed on the stack and does not actually allocate a register for the
// current argument.
return false;
}
/// GetFPR - Get the set of FP registers that should be allocated for arguments,
/// on Darwin.
static const uint16_t *GetFPR() {
static const uint16_t FPR[] = {
PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
};
return FPR;
}
/// CalculateStackSlotSize - Calculates the size reserved for this argument on
/// the stack.
static unsigned CalculateStackSlotSize(EVT ArgVT, ISD::ArgFlagsTy Flags,
unsigned PtrByteSize) {
unsigned ArgSize = ArgVT.getSizeInBits()/8;
if (Flags.isByVal())
ArgSize = Flags.getByValSize();
ArgSize = ((ArgSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
return ArgSize;
}
SDValue
PPCTargetLowering::LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg>
&Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals)
const {
if (PPCSubTarget.isSVR4ABI()) {
if (PPCSubTarget.isPPC64())
return LowerFormalArguments_64SVR4(Chain, CallConv, isVarArg, Ins,
dl, DAG, InVals);
else
return LowerFormalArguments_32SVR4(Chain, CallConv, isVarArg, Ins,
dl, DAG, InVals);
} else {
return LowerFormalArguments_Darwin(Chain, CallConv, isVarArg, Ins,
dl, DAG, InVals);
}
}
SDValue
PPCTargetLowering::LowerFormalArguments_32SVR4(
SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg>
&Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
// 32-bit SVR4 ABI Stack Frame Layout:
// +-----------------------------------+
// +--> | Back chain |
// | +-----------------------------------+
// | | Floating-point register save area |
// | +-----------------------------------+
// | | General register save area |
// | +-----------------------------------+
// | | CR save word |
// | +-----------------------------------+
// | | VRSAVE save word |
// | +-----------------------------------+
// | | Alignment padding |
// | +-----------------------------------+
// | | Vector register save area |
// | +-----------------------------------+
// | | Local variable space |
// | +-----------------------------------+
// | | Parameter list area |
// | +-----------------------------------+
// | | LR save word |
// | +-----------------------------------+
// SP--> +--- | Back chain |
// +-----------------------------------+
//
// Specifications:
// System V Application Binary Interface PowerPC Processor Supplement
// AltiVec Technology Programming Interface Manual
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
// Potential tail calls could cause overwriting of argument stack slots.
bool isImmutable = !(getTargetMachine().Options.GuaranteedTailCallOpt &&
(CallConv == CallingConv::Fast));
unsigned PtrByteSize = 4;
// Assign locations to all of the incoming arguments.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
getTargetMachine(), ArgLocs, *DAG.getContext());
// Reserve space for the linkage area on the stack.
CCInfo.AllocateStack(PPCFrameLowering::getLinkageSize(false, false), PtrByteSize);
CCInfo.AnalyzeFormalArguments(Ins, CC_PPC32_SVR4);
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
// Arguments stored in registers.
if (VA.isRegLoc()) {
const TargetRegisterClass *RC;
EVT ValVT = VA.getValVT();
switch (ValVT.getSimpleVT().SimpleTy) {
default:
llvm_unreachable("ValVT not supported by formal arguments Lowering");
case MVT::i32:
RC = &PPC::GPRCRegClass;
break;
case MVT::f32:
RC = &PPC::F4RCRegClass;
break;
case MVT::f64:
RC = &PPC::F8RCRegClass;
break;
case MVT::v16i8:
case MVT::v8i16:
case MVT::v4i32:
case MVT::v4f32:
RC = &PPC::VRRCRegClass;
break;
}
// Transform the arguments stored in physical registers into virtual ones.
unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, ValVT);
InVals.push_back(ArgValue);
} else {
// Argument stored in memory.
assert(VA.isMemLoc());
unsigned ArgSize = VA.getLocVT().getSizeInBits() / 8;
int FI = MFI->CreateFixedObject(ArgSize, VA.getLocMemOffset(),
isImmutable);
// Create load nodes to retrieve arguments from the stack.
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
MachinePointerInfo(),
false, false, false, 0));
}
}
// Assign locations to all of the incoming aggregate by value arguments.
// Aggregates passed by value are stored in the local variable space of the
// caller's stack frame, right above the parameter list area.
SmallVector<CCValAssign, 16> ByValArgLocs;
CCState CCByValInfo(CallConv, isVarArg, DAG.getMachineFunction(),
getTargetMachine(), ByValArgLocs, *DAG.getContext());
// Reserve stack space for the allocations in CCInfo.
CCByValInfo.AllocateStack(CCInfo.getNextStackOffset(), PtrByteSize);
CCByValInfo.AnalyzeFormalArguments(Ins, CC_PPC32_SVR4_ByVal);
// Area that is at least reserved in the caller of this function.
unsigned MinReservedArea = CCByValInfo.getNextStackOffset();
// Set the size that is at least reserved in caller of this function. Tail
// call optimized function's reserved stack space needs to be aligned so that
// taking the difference between two stack areas will result in an aligned
// stack.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
MinReservedArea =
std::max(MinReservedArea,
PPCFrameLowering::getMinCallFrameSize(false, false));
unsigned TargetAlign = DAG.getMachineFunction().getTarget().getFrameLowering()->
getStackAlignment();
unsigned AlignMask = TargetAlign-1;
MinReservedArea = (MinReservedArea + AlignMask) & ~AlignMask;
FI->setMinReservedArea(MinReservedArea);
SmallVector<SDValue, 8> MemOps;
// If the function takes variable number of arguments, make a frame index for
// the start of the first vararg value... for expansion of llvm.va_start.
if (isVarArg) {
static const uint16_t GPArgRegs[] = {
PPC::R3, PPC::R4, PPC::R5, PPC::R6,
PPC::R7, PPC::R8, PPC::R9, PPC::R10,
};
const unsigned NumGPArgRegs = array_lengthof(GPArgRegs);
static const uint16_t FPArgRegs[] = {
PPC::F1, PPC::F2, PPC::F3, PPC::F4, PPC::F5, PPC::F6, PPC::F7,
PPC::F8
};
const unsigned NumFPArgRegs = array_lengthof(FPArgRegs);
FuncInfo->setVarArgsNumGPR(CCInfo.getFirstUnallocated(GPArgRegs,
NumGPArgRegs));
FuncInfo->setVarArgsNumFPR(CCInfo.getFirstUnallocated(FPArgRegs,
NumFPArgRegs));
// Make room for NumGPArgRegs and NumFPArgRegs.
int Depth = NumGPArgRegs * PtrVT.getSizeInBits()/8 +
NumFPArgRegs * EVT(MVT::f64).getSizeInBits()/8;
FuncInfo->setVarArgsStackOffset(
MFI->CreateFixedObject(PtrVT.getSizeInBits()/8,
CCInfo.getNextStackOffset(), true));
FuncInfo->setVarArgsFrameIndex(MFI->CreateStackObject(Depth, 8, false));
SDValue FIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
// The fixed integer arguments of a variadic function are stored to the
// VarArgsFrameIndex on the stack so that they may be loaded by deferencing
// the result of va_next.
for (unsigned GPRIndex = 0; GPRIndex != NumGPArgRegs; ++GPRIndex) {
// Get an existing live-in vreg, or add a new one.
unsigned VReg = MF.getRegInfo().getLiveInVirtReg(GPArgRegs[GPRIndex]);
if (!VReg)
VReg = MF.addLiveIn(GPArgRegs[GPRIndex], &PPC::GPRCRegClass);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo(), false, false, 0);
MemOps.push_back(Store);
// Increment the address by four for the next argument to store
SDValue PtrOff = DAG.getConstant(PtrVT.getSizeInBits()/8, PtrVT);
FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
}
// FIXME 32-bit SVR4: We only need to save FP argument registers if CR bit 6
// is set.
// The double arguments are stored to the VarArgsFrameIndex
// on the stack.
for (unsigned FPRIndex = 0; FPRIndex != NumFPArgRegs; ++FPRIndex) {
// Get an existing live-in vreg, or add a new one.
unsigned VReg = MF.getRegInfo().getLiveInVirtReg(FPArgRegs[FPRIndex]);
if (!VReg)
VReg = MF.addLiveIn(FPArgRegs[FPRIndex], &PPC::F8RCRegClass);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::f64);
SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo(), false, false, 0);
MemOps.push_back(Store);
// Increment the address by eight for the next argument to store
SDValue PtrOff = DAG.getConstant(EVT(MVT::f64).getSizeInBits()/8,
PtrVT);
FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
}
}
if (!MemOps.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl,
MVT::Other, &MemOps[0], MemOps.size());
return Chain;
}
// PPC64 passes i8, i16, and i32 values in i64 registers. Promote
// value to MVT::i64 and then truncate to the correct register size.
SDValue
PPCTargetLowering::extendArgForPPC64(ISD::ArgFlagsTy Flags, EVT ObjectVT,
SelectionDAG &DAG, SDValue ArgVal,
SDLoc dl) const {
if (Flags.isSExt())
ArgVal = DAG.getNode(ISD::AssertSext, dl, MVT::i64, ArgVal,
DAG.getValueType(ObjectVT));
else if (Flags.isZExt())
ArgVal = DAG.getNode(ISD::AssertZext, dl, MVT::i64, ArgVal,
DAG.getValueType(ObjectVT));
return DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, ArgVal);
}
// Set the size that is at least reserved in caller of this function. Tail
// call optimized functions' reserved stack space needs to be aligned so that
// taking the difference between two stack areas will result in an aligned
// stack.
void
PPCTargetLowering::setMinReservedArea(MachineFunction &MF, SelectionDAG &DAG,
unsigned nAltivecParamsAtEnd,
unsigned MinReservedArea,
bool isPPC64) const {
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
// Add the Altivec parameters at the end, if needed.
if (nAltivecParamsAtEnd) {
MinReservedArea = ((MinReservedArea+15)/16)*16;
MinReservedArea += 16*nAltivecParamsAtEnd;
}
MinReservedArea =
std::max(MinReservedArea,
PPCFrameLowering::getMinCallFrameSize(isPPC64, true));
unsigned TargetAlign
= DAG.getMachineFunction().getTarget().getFrameLowering()->
getStackAlignment();
unsigned AlignMask = TargetAlign-1;
MinReservedArea = (MinReservedArea + AlignMask) & ~AlignMask;
FI->setMinReservedArea(MinReservedArea);
}
SDValue
PPCTargetLowering::LowerFormalArguments_64SVR4(
SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg>
&Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
// TODO: add description of PPC stack frame format, or at least some docs.
//
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
// Potential tail calls could cause overwriting of argument stack slots.
bool isImmutable = !(getTargetMachine().Options.GuaranteedTailCallOpt &&
(CallConv == CallingConv::Fast));
unsigned PtrByteSize = 8;
unsigned ArgOffset = PPCFrameLowering::getLinkageSize(true, true);
// Area that is at least reserved in caller of this function.
unsigned MinReservedArea = ArgOffset;
static const uint16_t GPR[] = {
PPC::X3, PPC::X4, PPC::X5, PPC::X6,
PPC::X7, PPC::X8, PPC::X9, PPC::X10,
};
static const uint16_t *FPR = GetFPR();
static const uint16_t VR[] = {
PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
};
const unsigned Num_GPR_Regs = array_lengthof(GPR);
const unsigned Num_FPR_Regs = 13;
const unsigned Num_VR_Regs = array_lengthof(VR);
unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
// Add DAG nodes to load the arguments or copy them out of registers. On
// entry to a function on PPC, the arguments start after the linkage area,
// although the first ones are often in registers.
SmallVector<SDValue, 8> MemOps;
unsigned nAltivecParamsAtEnd = 0;
Function::const_arg_iterator FuncArg = MF.getFunction()->arg_begin();
unsigned CurArgIdx = 0;
for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
SDValue ArgVal;
bool needsLoad = false;
EVT ObjectVT = Ins[ArgNo].VT;
unsigned ObjSize = ObjectVT.getSizeInBits()/8;
unsigned ArgSize = ObjSize;
ISD::ArgFlagsTy Flags = Ins[ArgNo].Flags;
std::advance(FuncArg, Ins[ArgNo].OrigArgIndex - CurArgIdx);
CurArgIdx = Ins[ArgNo].OrigArgIndex;
unsigned CurArgOffset = ArgOffset;
// Varargs or 64 bit Altivec parameters are padded to a 16 byte boundary.
if (ObjectVT==MVT::v4f32 || ObjectVT==MVT::v4i32 ||
ObjectVT==MVT::v8i16 || ObjectVT==MVT::v16i8) {
if (isVarArg) {
MinReservedArea = ((MinReservedArea+15)/16)*16;
MinReservedArea += CalculateStackSlotSize(ObjectVT,
Flags,
PtrByteSize);
} else
nAltivecParamsAtEnd++;
} else
// Calculate min reserved area.
MinReservedArea += CalculateStackSlotSize(Ins[ArgNo].VT,
Flags,
PtrByteSize);
// FIXME the codegen can be much improved in some cases.
// We do not have to keep everything in memory.
if (Flags.isByVal()) {
// ObjSize is the true size, ArgSize rounded up to multiple of registers.
ObjSize = Flags.getByValSize();
ArgSize = ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
// Empty aggregate parameters do not take up registers. Examples:
// struct { } a;
// union { } b;
// int c[0];
// etc. However, we have to provide a place-holder in InVals, so
// pretend we have an 8-byte item at the current address for that
// purpose.
if (!ObjSize) {
int FI = MFI->CreateFixedObject(PtrByteSize, ArgOffset, true);
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
InVals.push_back(FIN);
continue;
}
// All aggregates smaller than 8 bytes must be passed right-justified.
if (ObjSize < PtrByteSize)
CurArgOffset = CurArgOffset + (PtrByteSize - ObjSize);
// The value of the object is its address.
int FI = MFI->CreateFixedObject(ObjSize, CurArgOffset, true);
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
InVals.push_back(FIN);
if (ObjSize < 8) {
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
SDValue Store;
if (ObjSize==1 || ObjSize==2 || ObjSize==4) {
EVT ObjType = (ObjSize == 1 ? MVT::i8 :
(ObjSize == 2 ? MVT::i16 : MVT::i32));
Store = DAG.getTruncStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo(FuncArg, CurArgOffset),
ObjType, false, false, 0);
} else {
// For sizes that don't fit a truncating store (3, 5, 6, 7),
// store the whole register as-is to the parameter save area
// slot. The address of the parameter was already calculated
// above (InVals.push_back(FIN)) to be the right-justified
// offset within the slot. For this store, we need a new
// frame index that points at the beginning of the slot.
int FI = MFI->CreateFixedObject(PtrByteSize, ArgOffset, true);
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo(FuncArg, ArgOffset),
false, false, 0);
}
MemOps.push_back(Store);
++GPR_idx;
}
// Whether we copied from a register or not, advance the offset
// into the parameter save area by a full doubleword.
ArgOffset += PtrByteSize;
continue;
}
for (unsigned j = 0; j < ArgSize; j += PtrByteSize) {
// Store whatever pieces of the object are in registers
// to memory. ArgOffset will be the address of the beginning
// of the object.
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg;
VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
int FI = MFI->CreateFixedObject(PtrByteSize, ArgOffset, true);
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo(FuncArg, ArgOffset),
false, false, 0);
MemOps.push_back(Store);
++GPR_idx;
ArgOffset += PtrByteSize;
} else {
ArgOffset += ArgSize - j;
break;
}
}
continue;
}
switch (ObjectVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Unhandled argument type!");
case MVT::i32:
case MVT::i64:
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i64);
if (ObjectVT == MVT::i32)
// PPC64 passes i8, i16, and i32 values in i64 registers. Promote
// value to MVT::i64 and then truncate to the correct register size.
ArgVal = extendArgForPPC64(Flags, ObjectVT, DAG, ArgVal, dl);
++GPR_idx;
} else {
needsLoad = true;
ArgSize = PtrByteSize;
}
ArgOffset += 8;
break;
case MVT::f32:
case MVT::f64:
// Every 8 bytes of argument space consumes one of the GPRs available for
// argument passing.
if (GPR_idx != Num_GPR_Regs) {
++GPR_idx;
}
if (FPR_idx != Num_FPR_Regs) {
unsigned VReg;
if (ObjectVT == MVT::f32)
VReg = MF.addLiveIn(FPR[FPR_idx], &PPC::F4RCRegClass);
else
VReg = MF.addLiveIn(FPR[FPR_idx], &PPC::F8RCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
++FPR_idx;
} else {
needsLoad = true;
ArgSize = PtrByteSize;
}
ArgOffset += 8;
break;
case MVT::v4f32:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v16i8:
// Note that vector arguments in registers don't reserve stack space,
// except in varargs functions.
if (VR_idx != Num_VR_Regs) {
unsigned VReg = MF.addLiveIn(VR[VR_idx], &PPC::VRRCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
if (isVarArg) {
while ((ArgOffset % 16) != 0) {
ArgOffset += PtrByteSize;
if (GPR_idx != Num_GPR_Regs)
GPR_idx++;
}
ArgOffset += 16;
GPR_idx = std::min(GPR_idx+4, Num_GPR_Regs); // FIXME correct for ppc64?
}
++VR_idx;
} else {
// Vectors are aligned.
ArgOffset = ((ArgOffset+15)/16)*16;
CurArgOffset = ArgOffset;
ArgOffset += 16;
needsLoad = true;
}
break;
}
// We need to load the argument to a virtual register if we determined
// above that we ran out of physical registers of the appropriate type.
if (needsLoad) {
int FI = MFI->CreateFixedObject(ObjSize,
CurArgOffset + (ArgSize - ObjSize),
isImmutable);
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, MachinePointerInfo(),
false, false, false, 0);
}
InVals.push_back(ArgVal);
}
// Set the size that is at least reserved in caller of this function. Tail
// call optimized functions' reserved stack space needs to be aligned so that
// taking the difference between two stack areas will result in an aligned
// stack.
setMinReservedArea(MF, DAG, nAltivecParamsAtEnd, MinReservedArea, true);
// If the function takes variable number of arguments, make a frame index for
// the start of the first vararg value... for expansion of llvm.va_start.
if (isVarArg) {
int Depth = ArgOffset;
FuncInfo->setVarArgsFrameIndex(
MFI->CreateFixedObject(PtrByteSize, Depth, true));
SDValue FIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
// If this function is vararg, store any remaining integer argument regs
// to their spots on the stack so that they may be loaded by deferencing the
// result of va_next.
for (; GPR_idx != Num_GPR_Regs; ++GPR_idx) {
unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo(), false, false, 0);
MemOps.push_back(Store);
// Increment the address by four for the next argument to store
SDValue PtrOff = DAG.getConstant(PtrByteSize, PtrVT);
FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
}
}
if (!MemOps.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl,
MVT::Other, &MemOps[0], MemOps.size());
return Chain;
}
SDValue
PPCTargetLowering::LowerFormalArguments_Darwin(
SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg>
&Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
// TODO: add description of PPC stack frame format, or at least some docs.
//
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
bool isPPC64 = PtrVT == MVT::i64;
// Potential tail calls could cause overwriting of argument stack slots.
bool isImmutable = !(getTargetMachine().Options.GuaranteedTailCallOpt &&
(CallConv == CallingConv::Fast));
unsigned PtrByteSize = isPPC64 ? 8 : 4;
unsigned ArgOffset = PPCFrameLowering::getLinkageSize(isPPC64, true);
// Area that is at least reserved in caller of this function.
unsigned MinReservedArea = ArgOffset;
static const uint16_t GPR_32[] = { // 32-bit registers.
PPC::R3, PPC::R4, PPC::R5, PPC::R6,
PPC::R7, PPC::R8, PPC::R9, PPC::R10,
};
static const uint16_t GPR_64[] = { // 64-bit registers.
PPC::X3, PPC::X4, PPC::X5, PPC::X6,
PPC::X7, PPC::X8, PPC::X9, PPC::X10,
};
static const uint16_t *FPR = GetFPR();
static const uint16_t VR[] = {
PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
};
const unsigned Num_GPR_Regs = array_lengthof(GPR_32);
const unsigned Num_FPR_Regs = 13;
const unsigned Num_VR_Regs = array_lengthof( VR);
unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
const uint16_t *GPR = isPPC64 ? GPR_64 : GPR_32;
// In 32-bit non-varargs functions, the stack space for vectors is after the
// stack space for non-vectors. We do not use this space unless we have
// too many vectors to fit in registers, something that only occurs in
// constructed examples:), but we have to walk the arglist to figure
// that out...for the pathological case, compute VecArgOffset as the
// start of the vector parameter area. Computing VecArgOffset is the
// entire point of the following loop.
unsigned VecArgOffset = ArgOffset;
if (!isVarArg && !isPPC64) {
for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e;
++ArgNo) {
EVT ObjectVT = Ins[ArgNo].VT;
ISD::ArgFlagsTy Flags = Ins[ArgNo].Flags;
if (Flags.isByVal()) {
// ObjSize is the true size, ArgSize rounded up to multiple of regs.
unsigned ObjSize = Flags.getByValSize();
unsigned ArgSize =
((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
VecArgOffset += ArgSize;
continue;
}
switch(ObjectVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Unhandled argument type!");
case MVT::i32:
case MVT::f32:
VecArgOffset += 4;
break;
case MVT::i64: // PPC64
case MVT::f64:
// FIXME: We are guaranteed to be !isPPC64 at this point.
// Does MVT::i64 apply?
VecArgOffset += 8;
break;
case MVT::v4f32:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v16i8:
// Nothing to do, we're only looking at Nonvector args here.
break;
}
}
}
// We've found where the vector parameter area in memory is. Skip the
// first 12 parameters; these don't use that memory.
VecArgOffset = ((VecArgOffset+15)/16)*16;
VecArgOffset += 12*16;
// Add DAG nodes to load the arguments or copy them out of registers. On
// entry to a function on PPC, the arguments start after the linkage area,
// although the first ones are often in registers.
SmallVector<SDValue, 8> MemOps;
unsigned nAltivecParamsAtEnd = 0;
Function::const_arg_iterator FuncArg = MF.getFunction()->arg_begin();
unsigned CurArgIdx = 0;
for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
SDValue ArgVal;
bool needsLoad = false;
EVT ObjectVT = Ins[ArgNo].VT;
unsigned ObjSize = ObjectVT.getSizeInBits()/8;
unsigned ArgSize = ObjSize;
ISD::ArgFlagsTy Flags = Ins[ArgNo].Flags;
std::advance(FuncArg, Ins[ArgNo].OrigArgIndex - CurArgIdx);
CurArgIdx = Ins[ArgNo].OrigArgIndex;
unsigned CurArgOffset = ArgOffset;
// Varargs or 64 bit Altivec parameters are padded to a 16 byte boundary.
if (ObjectVT==MVT::v4f32 || ObjectVT==MVT::v4i32 ||
ObjectVT==MVT::v8i16 || ObjectVT==MVT::v16i8) {
if (isVarArg || isPPC64) {
MinReservedArea = ((MinReservedArea+15)/16)*16;
MinReservedArea += CalculateStackSlotSize(ObjectVT,
Flags,
PtrByteSize);
} else nAltivecParamsAtEnd++;
} else
// Calculate min reserved area.
MinReservedArea += CalculateStackSlotSize(Ins[ArgNo].VT,
Flags,
PtrByteSize);
// FIXME the codegen can be much improved in some cases.
// We do not have to keep everything in memory.
if (Flags.isByVal()) {
// ObjSize is the true size, ArgSize rounded up to multiple of registers.
ObjSize = Flags.getByValSize();
ArgSize = ((ObjSize + PtrByteSize - 1)/PtrByteSize) * PtrByteSize;
// Objects of size 1 and 2 are right justified, everything else is
// left justified. This means the memory address is adjusted forwards.
if (ObjSize==1 || ObjSize==2) {
CurArgOffset = CurArgOffset + (4 - ObjSize);
}
// The value of the object is its address.
int FI = MFI->CreateFixedObject(ObjSize, CurArgOffset, true);
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
InVals.push_back(FIN);
if (ObjSize==1 || ObjSize==2) {
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg;
if (isPPC64)
VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
else
VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
EVT ObjType = ObjSize == 1 ? MVT::i8 : MVT::i16;
SDValue Store = DAG.getTruncStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo(FuncArg,
CurArgOffset),
ObjType, false, false, 0);
MemOps.push_back(Store);
++GPR_idx;
}
ArgOffset += PtrByteSize;
continue;
}
for (unsigned j = 0; j < ArgSize; j += PtrByteSize) {
// Store whatever pieces of the object are in registers
// to memory. ArgOffset will be the address of the beginning
// of the object.
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg;
if (isPPC64)
VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
else
VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
int FI = MFI->CreateFixedObject(PtrByteSize, ArgOffset, true);
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo(FuncArg, ArgOffset),
false, false, 0);
MemOps.push_back(Store);
++GPR_idx;
ArgOffset += PtrByteSize;
} else {
ArgOffset += ArgSize - (ArgOffset-CurArgOffset);
break;
}
}
continue;
}
switch (ObjectVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Unhandled argument type!");
case MVT::i32:
if (!isPPC64) {
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
++GPR_idx;
} else {
needsLoad = true;
ArgSize = PtrByteSize;
}
// All int arguments reserve stack space in the Darwin ABI.
ArgOffset += PtrByteSize;
break;
}
// FALLTHROUGH
case MVT::i64: // PPC64
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i64);
if (ObjectVT == MVT::i32)
// PPC64 passes i8, i16, and i32 values in i64 registers. Promote
// value to MVT::i64 and then truncate to the correct register size.
ArgVal = extendArgForPPC64(Flags, ObjectVT, DAG, ArgVal, dl);
++GPR_idx;
} else {
needsLoad = true;
ArgSize = PtrByteSize;
}
// All int arguments reserve stack space in the Darwin ABI.
ArgOffset += 8;
break;
case MVT::f32:
case MVT::f64:
// Every 4 bytes of argument space consumes one of the GPRs available for
// argument passing.
if (GPR_idx != Num_GPR_Regs) {
++GPR_idx;
if (ObjSize == 8 && GPR_idx != Num_GPR_Regs && !isPPC64)
++GPR_idx;
}
if (FPR_idx != Num_FPR_Regs) {
unsigned VReg;
if (ObjectVT == MVT::f32)
VReg = MF.addLiveIn(FPR[FPR_idx], &PPC::F4RCRegClass);
else
VReg = MF.addLiveIn(FPR[FPR_idx], &PPC::F8RCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
++FPR_idx;
} else {
needsLoad = true;
}
// All FP arguments reserve stack space in the Darwin ABI.
ArgOffset += isPPC64 ? 8 : ObjSize;
break;
case MVT::v4f32:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v16i8:
// Note that vector arguments in registers don't reserve stack space,
// except in varargs functions.
if (VR_idx != Num_VR_Regs) {
unsigned VReg = MF.addLiveIn(VR[VR_idx], &PPC::VRRCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, VReg, ObjectVT);
if (isVarArg) {
while ((ArgOffset % 16) != 0) {
ArgOffset += PtrByteSize;
if (GPR_idx != Num_GPR_Regs)
GPR_idx++;
}
ArgOffset += 16;
GPR_idx = std::min(GPR_idx+4, Num_GPR_Regs); // FIXME correct for ppc64?
}
++VR_idx;
} else {
if (!isVarArg && !isPPC64) {
// Vectors go after all the nonvectors.
CurArgOffset = VecArgOffset;
VecArgOffset += 16;
} else {
// Vectors are aligned.
ArgOffset = ((ArgOffset+15)/16)*16;
CurArgOffset = ArgOffset;
ArgOffset += 16;
}
needsLoad = true;
}
break;
}
// We need to load the argument to a virtual register if we determined above
// that we ran out of physical registers of the appropriate type.
if (needsLoad) {
int FI = MFI->CreateFixedObject(ObjSize,
CurArgOffset + (ArgSize - ObjSize),
isImmutable);
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, MachinePointerInfo(),
false, false, false, 0);
}
InVals.push_back(ArgVal);
}
// Set the size that is at least reserved in caller of this function. Tail
// call optimized functions' reserved stack space needs to be aligned so that
// taking the difference between two stack areas will result in an aligned
// stack.
setMinReservedArea(MF, DAG, nAltivecParamsAtEnd, MinReservedArea, isPPC64);
// If the function takes variable number of arguments, make a frame index for
// the start of the first vararg value... for expansion of llvm.va_start.
if (isVarArg) {
int Depth = ArgOffset;
FuncInfo->setVarArgsFrameIndex(
MFI->CreateFixedObject(PtrVT.getSizeInBits()/8,
Depth, true));
SDValue FIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
// If this function is vararg, store any remaining integer argument regs
// to their spots on the stack so that they may be loaded by deferencing the
// result of va_next.
for (; GPR_idx != Num_GPR_Regs; ++GPR_idx) {
unsigned VReg;
if (isPPC64)
VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::G8RCRegClass);
else
VReg = MF.addLiveIn(GPR[GPR_idx], &PPC::GPRCRegClass);
SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, PtrVT);
SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
MachinePointerInfo(), false, false, 0);
MemOps.push_back(Store);
// Increment the address by four for the next argument to store
SDValue PtrOff = DAG.getConstant(PtrVT.getSizeInBits()/8, PtrVT);
FIN = DAG.getNode(ISD::ADD, dl, PtrOff.getValueType(), FIN, PtrOff);
}
}
if (!MemOps.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl,
MVT::Other, &MemOps[0], MemOps.size());
return Chain;
}
/// CalculateParameterAndLinkageAreaSize - Get the size of the parameter plus
/// linkage area for the Darwin ABI, or the 64-bit SVR4 ABI.
static unsigned
CalculateParameterAndLinkageAreaSize(SelectionDAG &DAG,
bool isPPC64,
bool isVarArg,
unsigned CC,
const SmallVectorImpl<ISD::OutputArg>
&Outs,
const SmallVectorImpl<SDValue> &OutVals,
unsigned &nAltivecParamsAtEnd) {
// Count how many bytes are to be pushed on the stack, including the linkage
// area, and parameter passing area. We start with 24/48 bytes, which is
// prereserved space for [SP][CR][LR][3 x unused].
unsigned NumBytes = PPCFrameLowering::getLinkageSize(isPPC64, true);
unsigned NumOps = Outs.size();
unsigned PtrByteSize = isPPC64 ? 8 : 4;
// Add up all the space actually used.
// In 32-bit non-varargs calls, Altivec parameters all go at the end; usually
// they all go in registers, but we must reserve stack space for them for
// possible use by the caller. In varargs or 64-bit calls, parameters are
// assigned stack space in order, with padding so Altivec parameters are
// 16-byte aligned.
nAltivecParamsAtEnd = 0;
for (unsigned i = 0; i != NumOps; ++i) {
ISD::ArgFlagsTy Flags = Outs[i].Flags;
EVT ArgVT = Outs[i].VT;
// Varargs Altivec parameters are padded to a 16 byte boundary.
if (ArgVT==MVT::v4f32 || ArgVT==MVT::v4i32 ||
ArgVT==MVT::v8i16 || ArgVT==MVT::v16i8) {
if (!isVarArg && !isPPC64) {
// Non-varargs Altivec parameters go after all the non-Altivec
// parameters; handle those later so we know how much padding we need.
nAltivecParamsAtEnd++;
continue;
}
// Varargs and 64-bit Altivec parameters are padded to 16 byte boundary.
NumBytes = ((NumBytes+15)/16)*16;
}
NumBytes += CalculateStackSlotSize(ArgVT, Flags, PtrByteSize);
}
// Allow for Altivec parameters at the end, if needed.
if (nAltivecParamsAtEnd) {
NumBytes = ((NumBytes+15)/16)*16;
NumBytes += 16*nAltivecParamsAtEnd;
}
// The prolog code of the callee may store up to 8 GPR argument registers to
// the stack, allowing va_start to index over them in memory if its varargs.
// Because we cannot tell if this is needed on the caller side, we have to
// conservatively assume that it is needed. As such, make sure we have at
// least enough stack space for the caller to store the 8 GPRs.
NumBytes = std::max(NumBytes,
PPCFrameLowering::getMinCallFrameSize(isPPC64, true));
// Tail call needs the stack to be aligned.
if (CC == CallingConv::Fast && DAG.getTarget().Options.GuaranteedTailCallOpt){
unsigned TargetAlign = DAG.getMachineFunction().getTarget().
getFrameLowering()->getStackAlignment();
unsigned AlignMask = TargetAlign-1;
NumBytes = (NumBytes + AlignMask) & ~AlignMask;
}
return NumBytes;
}
/// CalculateTailCallSPDiff - Get the amount the stack pointer has to be
/// adjusted to accommodate the arguments for the tailcall.
static int CalculateTailCallSPDiff(SelectionDAG& DAG, bool isTailCall,
unsigned ParamSize) {
if (!isTailCall) return 0;
PPCFunctionInfo *FI = DAG.getMachineFunction().getInfo<PPCFunctionInfo>();
unsigned CallerMinReservedArea = FI->getMinReservedArea();
int SPDiff = (int)CallerMinReservedArea - (int)ParamSize;
// Remember only if the new adjustement is bigger.
if (SPDiff < FI->getTailCallSPDelta())
FI->setTailCallSPDelta(SPDiff);
return SPDiff;
}
/// IsEligibleForTailCallOptimization - Check whether the call is eligible
/// for tail call optimization. Targets which want to do tail call
/// optimization should implement this function.
bool
PPCTargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
CallingConv::ID CalleeCC,
bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SelectionDAG& DAG) const {
if (!getTargetMachine().Options.GuaranteedTailCallOpt)
return false;
// Variable argument functions are not supported.
if (isVarArg)
return false;
MachineFunction &MF = DAG.getMachineFunction();
CallingConv::ID CallerCC = MF.getFunction()->getCallingConv();
if (CalleeCC == CallingConv::Fast && CallerCC == CalleeCC) {
// Functions containing by val parameters are not supported.
for (unsigned i = 0; i != Ins.size(); i++) {
ISD::ArgFlagsTy Flags = Ins[i].Flags;
if (Flags.isByVal()) return false;
}
// Non PIC/GOT tail calls are supported.
if (getTargetMachine().getRelocationModel() != Reloc::PIC_)
return true;
// At the moment we can only do local tail calls (in same module, hidden
// or protected) if we are generating PIC.
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
return G->getGlobal()->hasHiddenVisibility()
|| G->getGlobal()->hasProtectedVisibility();
}
return false;
}
/// isCallCompatibleAddress - Return the immediate to use if the specified
/// 32-bit value is representable in the immediate field of a BxA instruction.
static SDNode *isBLACompatibleAddress(SDValue Op, SelectionDAG &DAG) {
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
if (!C) return 0;
int Addr = C->getZExtValue();
if ((Addr & 3) != 0 || // Low 2 bits are implicitly zero.
SignExtend32<26>(Addr) != Addr)
return 0; // Top 6 bits have to be sext of immediate.
return DAG.getConstant((int)C->getZExtValue() >> 2,
DAG.getTargetLoweringInfo().getPointerTy()).getNode();
}
namespace {
struct TailCallArgumentInfo {
SDValue Arg;
SDValue FrameIdxOp;
int FrameIdx;
TailCallArgumentInfo() : FrameIdx(0) {}
};
}
/// StoreTailCallArgumentsToStackSlot - Stores arguments to their stack slot.
static void
StoreTailCallArgumentsToStackSlot(SelectionDAG &DAG,
SDValue Chain,
const SmallVector<TailCallArgumentInfo, 8> &TailCallArgs,
SmallVector<SDValue, 8> &MemOpChains,
SDLoc dl) {
for (unsigned i = 0, e = TailCallArgs.size(); i != e; ++i) {
SDValue Arg = TailCallArgs[i].Arg;
SDValue FIN = TailCallArgs[i].FrameIdxOp;
int FI = TailCallArgs[i].FrameIdx;
// Store relative to framepointer.
MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, FIN,
MachinePointerInfo::getFixedStack(FI),
false, false, 0));
}
}
/// EmitTailCallStoreFPAndRetAddr - Move the frame pointer and return address to
/// the appropriate stack slot for the tail call optimized function call.
static SDValue EmitTailCallStoreFPAndRetAddr(SelectionDAG &DAG,
MachineFunction &MF,
SDValue Chain,
SDValue OldRetAddr,
SDValue OldFP,
int SPDiff,
bool isPPC64,
bool isDarwinABI,
SDLoc dl) {
if (SPDiff) {
// Calculate the new stack slot for the return address.
int SlotSize = isPPC64 ? 8 : 4;
int NewRetAddrLoc = SPDiff + PPCFrameLowering::getReturnSaveOffset(isPPC64,
isDarwinABI);
int NewRetAddr = MF.getFrameInfo()->CreateFixedObject(SlotSize,
NewRetAddrLoc, true);
EVT VT = isPPC64 ? MVT::i64 : MVT::i32;
SDValue NewRetAddrFrIdx = DAG.getFrameIndex(NewRetAddr, VT);
Chain = DAG.getStore(Chain, dl, OldRetAddr, NewRetAddrFrIdx,
MachinePointerInfo::getFixedStack(NewRetAddr),
false, false, 0);
// When using the 32/64-bit SVR4 ABI there is no need to move the FP stack
// slot as the FP is never overwritten.
if (isDarwinABI) {
int NewFPLoc =
SPDiff + PPCFrameLowering::getFramePointerSaveOffset(isPPC64, isDarwinABI);
int NewFPIdx = MF.getFrameInfo()->CreateFixedObject(SlotSize, NewFPLoc,
true);
SDValue NewFramePtrIdx = DAG.getFrameIndex(NewFPIdx, VT);
Chain = DAG.getStore(Chain, dl, OldFP, NewFramePtrIdx,
MachinePointerInfo::getFixedStack(NewFPIdx),
false, false, 0);
}
}
return Chain;
}
/// CalculateTailCallArgDest - Remember Argument for later processing. Calculate
/// the position of the argument.
static void
CalculateTailCallArgDest(SelectionDAG &DAG, MachineFunction &MF, bool isPPC64,
SDValue Arg, int SPDiff, unsigned ArgOffset,
SmallVector<TailCallArgumentInfo, 8>& TailCallArguments) {
int Offset = ArgOffset + SPDiff;
uint32_t OpSize = (Arg.getValueType().getSizeInBits()+7)/8;
int FI = MF.getFrameInfo()->CreateFixedObject(OpSize, Offset, true);
EVT VT = isPPC64 ? MVT::i64 : MVT::i32;
SDValue FIN = DAG.getFrameIndex(FI, VT);
TailCallArgumentInfo Info;
Info.Arg = Arg;
Info.FrameIdxOp = FIN;
Info.FrameIdx = FI;
TailCallArguments.push_back(Info);
}
/// EmitTCFPAndRetAddrLoad - Emit load from frame pointer and return address
/// stack slot. Returns the chain as result and the loaded frame pointers in
/// LROpOut/FPOpout. Used when tail calling.
SDValue PPCTargetLowering::EmitTailCallLoadFPAndRetAddr(SelectionDAG & DAG,
int SPDiff,
SDValue Chain,
SDValue &LROpOut,
SDValue &FPOpOut,
bool isDarwinABI,
SDLoc dl) const {
if (SPDiff) {
// Load the LR and FP stack slot for later adjusting.
EVT VT = PPCSubTarget.isPPC64() ? MVT::i64 : MVT::i32;
LROpOut = getReturnAddrFrameIndex(DAG);
LROpOut = DAG.getLoad(VT, dl, Chain, LROpOut, MachinePointerInfo(),
false, false, false, 0);
Chain = SDValue(LROpOut.getNode(), 1);
// When using the 32/64-bit SVR4 ABI there is no need to load the FP stack
// slot as the FP is never overwritten.
if (isDarwinABI) {
FPOpOut = getFramePointerFrameIndex(DAG);
FPOpOut = DAG.getLoad(VT, dl, Chain, FPOpOut, MachinePointerInfo(),
false, false, false, 0);
Chain = SDValue(FPOpOut.getNode(), 1);
}
}
return Chain;
}
/// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
/// by "Src" to address "Dst" of size "Size". Alignment information is
/// specified by the specific parameter attribute. The copy will be passed as
/// a byval function parameter.
/// Sometimes what we are copying is the end of a larger object, the part that
/// does not fit in registers.
static SDValue
CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
SDLoc dl) {
SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32);
return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
false, false, MachinePointerInfo(0),
MachinePointerInfo(0));
}
/// LowerMemOpCallTo - Store the argument to the stack or remember it in case of
/// tail calls.
static void
LowerMemOpCallTo(SelectionDAG &DAG, MachineFunction &MF, SDValue Chain,
SDValue Arg, SDValue PtrOff, int SPDiff,
unsigned ArgOffset, bool isPPC64, bool isTailCall,
bool isVector, SmallVector<SDValue, 8> &MemOpChains,
SmallVector<TailCallArgumentInfo, 8> &TailCallArguments,
SDLoc dl) {
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
if (!isTailCall) {
if (isVector) {
SDValue StackPtr;
if (isPPC64)
StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
else
StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr,
DAG.getConstant(ArgOffset, PtrVT));
}
MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
MachinePointerInfo(), false, false, 0));
// Calculate and remember argument location.
} else CalculateTailCallArgDest(DAG, MF, isPPC64, Arg, SPDiff, ArgOffset,
TailCallArguments);
}
static
void PrepareTailCall(SelectionDAG &DAG, SDValue &InFlag, SDValue &Chain,
SDLoc dl, bool isPPC64, int SPDiff, unsigned NumBytes,
SDValue LROp, SDValue FPOp, bool isDarwinABI,
SmallVector<TailCallArgumentInfo, 8> &TailCallArguments) {
MachineFunction &MF = DAG.getMachineFunction();
// Emit a sequence of copyto/copyfrom virtual registers for arguments that
// might overwrite each other in case of tail call optimization.
SmallVector<SDValue, 8> MemOpChains2;
// Do not flag preceding copytoreg stuff together with the following stuff.
InFlag = SDValue();
StoreTailCallArgumentsToStackSlot(DAG, Chain, TailCallArguments,
MemOpChains2, dl);
if (!MemOpChains2.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOpChains2[0], MemOpChains2.size());
// Store the return address to the appropriate stack slot.
Chain = EmitTailCallStoreFPAndRetAddr(DAG, MF, Chain, LROp, FPOp, SPDiff,
isPPC64, isDarwinABI, dl);
// Emit callseq_end just before tailcall node.
Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
DAG.getIntPtrConstant(0, true), InFlag, dl);
InFlag = Chain.getValue(1);
}
static
unsigned PrepareCall(SelectionDAG &DAG, SDValue &Callee, SDValue &InFlag,
SDValue &Chain, SDLoc dl, int SPDiff, bool isTailCall,
SmallVector<std::pair<unsigned, SDValue>, 8> &RegsToPass,
SmallVector<SDValue, 8> &Ops, std::vector<EVT> &NodeTys,
const PPCSubtarget &PPCSubTarget) {
bool isPPC64 = PPCSubTarget.isPPC64();
bool isSVR4ABI = PPCSubTarget.isSVR4ABI();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
NodeTys.push_back(MVT::Other); // Returns a chain
NodeTys.push_back(MVT::Glue); // Returns a flag for retval copy to use.
unsigned CallOpc = PPCISD::CALL;
bool needIndirectCall = true;
if (SDNode *Dest = isBLACompatibleAddress(Callee, DAG)) {
// If this is an absolute destination address, use the munged value.
Callee = SDValue(Dest, 0);
needIndirectCall = false;
}
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
// XXX Work around for http://llvm.org/bugs/show_bug.cgi?id=5201
// Use indirect calls for ALL functions calls in JIT mode, since the
// far-call stubs may be outside relocation limits for a BL instruction.
if (!DAG.getTarget().getSubtarget<PPCSubtarget>().isJITCodeModel()) {
unsigned OpFlags = 0;
if (DAG.getTarget().getRelocationModel() != Reloc::Static &&
(PPCSubTarget.getTargetTriple().isMacOSX() &&
PPCSubTarget.getTargetTriple().isMacOSXVersionLT(10, 5)) &&
(G->getGlobal()->isDeclaration() ||
G->getGlobal()->isWeakForLinker())) {
// PC-relative references to external symbols should go through $stub,
// unless we're building with the leopard linker or later, which
// automatically synthesizes these stubs.
OpFlags = PPCII::MO_DARWIN_STUB;
}
// If the callee is a GlobalAddress/ExternalSymbol node (quite common,
// every direct call is) turn it into a TargetGlobalAddress /
// TargetExternalSymbol node so that legalize doesn't hack it.
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl,
Callee.getValueType(),
0, OpFlags);
needIndirectCall = false;
}
}
if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
unsigned char OpFlags = 0;
if (DAG.getTarget().getRelocationModel() != Reloc::Static &&
(PPCSubTarget.getTargetTriple().isMacOSX() &&
PPCSubTarget.getTargetTriple().isMacOSXVersionLT(10, 5))) {
// PC-relative references to external symbols should go through $stub,
// unless we're building with the leopard linker or later, which
// automatically synthesizes these stubs.
OpFlags = PPCII::MO_DARWIN_STUB;
}
Callee = DAG.getTargetExternalSymbol(S->getSymbol(), Callee.getValueType(),
OpFlags);
needIndirectCall = false;
}
if (needIndirectCall) {
// Otherwise, this is an indirect call. We have to use a MTCTR/BCTRL pair
// to do the call, we can't use PPCISD::CALL.
SDValue MTCTROps[] = {Chain, Callee, InFlag};
if (isSVR4ABI && isPPC64) {
// Function pointers in the 64-bit SVR4 ABI do not point to the function
// entry point, but to the function descriptor (the function entry point
// address is part of the function descriptor though).
// The function descriptor is a three doubleword structure with the
// following fields: function entry point, TOC base address and
// environment pointer.
// Thus for a call through a function pointer, the following actions need
// to be performed:
// 1. Save the TOC of the caller in the TOC save area of its stack
// frame (this is done in LowerCall_Darwin() or LowerCall_64SVR4()).
// 2. Load the address of the function entry point from the function
// descriptor.
// 3. Load the TOC of the callee from the function descriptor into r2.
// 4. Load the environment pointer from the function descriptor into
// r11.
// 5. Branch to the function entry point address.
// 6. On return of the callee, the TOC of the caller needs to be
// restored (this is done in FinishCall()).
//
// All those operations are flagged together to ensure that no other
// operations can be scheduled in between. E.g. without flagging the
// operations together, a TOC access in the caller could be scheduled
// between the load of the callee TOC and the branch to the callee, which
// results in the TOC access going through the TOC of the callee instead
// of going through the TOC of the caller, which leads to incorrect code.
// Load the address of the function entry point from the function
// descriptor.
SDVTList VTs = DAG.getVTList(MVT::i64, MVT::Other, MVT::Glue);
SDValue LoadFuncPtr = DAG.getNode(PPCISD::LOAD, dl, VTs, MTCTROps,
InFlag.getNode() ? 3 : 2);
Chain = LoadFuncPtr.getValue(1);
InFlag = LoadFuncPtr.getValue(2);
// Load environment pointer into r11.
// Offset of the environment pointer within the function descriptor.
SDValue PtrOff = DAG.getIntPtrConstant(16);
SDValue AddPtr = DAG.getNode(ISD::ADD, dl, MVT::i64, Callee, PtrOff);
SDValue LoadEnvPtr = DAG.getNode(PPCISD::LOAD, dl, VTs, Chain, AddPtr,
InFlag);
Chain = LoadEnvPtr.getValue(1);
InFlag = LoadEnvPtr.getValue(2);
SDValue EnvVal = DAG.getCopyToReg(Chain, dl, PPC::X11, LoadEnvPtr,
InFlag);
Chain = EnvVal.getValue(0);
InFlag = EnvVal.getValue(1);
// Load TOC of the callee into r2. We are using a target-specific load
// with r2 hard coded, because the result of a target-independent load
// would never go directly into r2, since r2 is a reserved register (which
// prevents the register allocator from allocating it), resulting in an
// additional register being allocated and an unnecessary move instruction
// being generated.
VTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue LoadTOCPtr = DAG.getNode(PPCISD::LOAD_TOC, dl, VTs, Chain,
Callee, InFlag);
Chain = LoadTOCPtr.getValue(0);
InFlag = LoadTOCPtr.getValue(1);
MTCTROps[0] = Chain;
MTCTROps[1] = LoadFuncPtr;
MTCTROps[2] = InFlag;
}
Chain = DAG.getNode(PPCISD::MTCTR, dl, NodeTys, MTCTROps,
2 + (InFlag.getNode() != 0));
InFlag = Chain.getValue(1);
NodeTys.clear();
NodeTys.push_back(MVT::Other);
NodeTys.push_back(MVT::Glue);
Ops.push_back(Chain);
CallOpc = PPCISD::BCTRL;
Callee.setNode(0);
// Add use of X11 (holding environment pointer)
if (isSVR4ABI && isPPC64)
Ops.push_back(DAG.getRegister(PPC::X11, PtrVT));
// Add CTR register as callee so a bctr can be emitted later.
if (isTailCall)
Ops.push_back(DAG.getRegister(isPPC64 ? PPC::CTR8 : PPC::CTR, PtrVT));
}
// If this is a direct call, pass the chain and the callee.
if (Callee.getNode()) {
Ops.push_back(Chain);
Ops.push_back(Callee);
}
// If this is a tail call add stack pointer delta.
if (isTailCall)
Ops.push_back(DAG.getConstant(SPDiff, MVT::i32));
// Add argument registers to the end of the list so that they are known live
// into the call.
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
Ops.push_back(DAG.getRegister(RegsToPass[i].first,
RegsToPass[i].second.getValueType()));
return CallOpc;
}
static
bool isLocalCall(const SDValue &Callee)
{
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
return !G->getGlobal()->isDeclaration() &&
!G->getGlobal()->isWeakForLinker();
return false;
}
SDValue
PPCTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
SmallVector<CCValAssign, 16> RVLocs;
CCState CCRetInfo(CallConv, isVarArg, DAG.getMachineFunction(),
getTargetMachine(), RVLocs, *DAG.getContext());
CCRetInfo.AnalyzeCallResult(Ins, RetCC_PPC);
// Copy all of the result registers out of their specified physreg.
for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
CCValAssign &VA = RVLocs[i];
assert(VA.isRegLoc() && "Can only return in registers!");
SDValue Val = DAG.getCopyFromReg(Chain, dl,
VA.getLocReg(), VA.getLocVT(), InFlag);
Chain = Val.getValue(1);
InFlag = Val.getValue(2);
switch (VA.getLocInfo()) {
default: llvm_unreachable("Unknown loc info!");
case CCValAssign::Full: break;
case CCValAssign::AExt:
Val = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val);
break;
case CCValAssign::ZExt:
Val = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), Val,
DAG.getValueType(VA.getValVT()));
Val = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val);
break;
case CCValAssign::SExt:
Val = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), Val,
DAG.getValueType(VA.getValVT()));
Val = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val);
break;
}
InVals.push_back(Val);
}
return Chain;
}
SDValue
PPCTargetLowering::FinishCall(CallingConv::ID CallConv, SDLoc dl,
bool isTailCall, bool isVarArg,
SelectionDAG &DAG,
SmallVector<std::pair<unsigned, SDValue>, 8>
&RegsToPass,
SDValue InFlag, SDValue Chain,
SDValue &Callee,
int SPDiff, unsigned NumBytes,
const SmallVectorImpl<ISD::InputArg> &Ins,
SmallVectorImpl<SDValue> &InVals) const {
std::vector<EVT> NodeTys;
SmallVector<SDValue, 8> Ops;
unsigned CallOpc = PrepareCall(DAG, Callee, InFlag, Chain, dl, SPDiff,
isTailCall, RegsToPass, Ops, NodeTys,
PPCSubTarget);
// Add implicit use of CR bit 6 for 32-bit SVR4 vararg calls
if (isVarArg && PPCSubTarget.isSVR4ABI() && !PPCSubTarget.isPPC64())
Ops.push_back(DAG.getRegister(PPC::CR1EQ, MVT::i32));
// When performing tail call optimization the callee pops its arguments off
// the stack. Account for this here so these bytes can be pushed back on in
// PPCFrameLowering::eliminateCallFramePseudoInstr.
int BytesCalleePops =
(CallConv == CallingConv::Fast &&
getTargetMachine().Options.GuaranteedTailCallOpt) ? NumBytes : 0;
// Add a register mask operand representing the call-preserved registers.
const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
const uint32_t *Mask = TRI->getCallPreservedMask(CallConv);
assert(Mask && "Missing call preserved mask for calling convention");
Ops.push_back(DAG.getRegisterMask(Mask));
if (InFlag.getNode())
Ops.push_back(InFlag);
// Emit tail call.
if (isTailCall) {
assert(((Callee.getOpcode() == ISD::Register &&
cast<RegisterSDNode>(Callee)->getReg() == PPC::CTR) ||
Callee.getOpcode() == ISD::TargetExternalSymbol ||
Callee.getOpcode() == ISD::TargetGlobalAddress ||
isa<ConstantSDNode>(Callee)) &&
"Expecting an global address, external symbol, absolute value or register");
return DAG.getNode(PPCISD::TC_RETURN, dl, MVT::Other, &Ops[0], Ops.size());
}
// Add a NOP immediately after the branch instruction when using the 64-bit
// SVR4 ABI. At link time, if caller and callee are in a different module and
// thus have a different TOC, the call will be replaced with a call to a stub
// function which saves the current TOC, loads the TOC of the callee and
// branches to the callee. The NOP will be replaced with a load instruction
// which restores the TOC of the caller from the TOC save slot of the current
// stack frame. If caller and callee belong to the same module (and have the
// same TOC), the NOP will remain unchanged.
bool needsTOCRestore = false;
if (!isTailCall && PPCSubTarget.isSVR4ABI()&& PPCSubTarget.isPPC64()) {
if (CallOpc == PPCISD::BCTRL) {
// This is a call through a function pointer.
// Restore the caller TOC from the save area into R2.
// See PrepareCall() for more information about calls through function
// pointers in the 64-bit SVR4 ABI.
// We are using a target-specific load with r2 hard coded, because the
// result of a target-independent load would never go directly into r2,
// since r2 is a reserved register (which prevents the register allocator
// from allocating it), resulting in an additional register being
// allocated and an unnecessary move instruction being generated.
needsTOCRestore = true;
} else if ((CallOpc == PPCISD::CALL) && !isLocalCall(Callee)) {
// Otherwise insert NOP for non-local calls.
CallOpc = PPCISD::CALL_NOP;
}
}
Chain = DAG.getNode(CallOpc, dl, NodeTys, &Ops[0], Ops.size());
InFlag = Chain.getValue(1);
if (needsTOCRestore) {
SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
Chain = DAG.getNode(PPCISD::TOC_RESTORE, dl, VTs, Chain, InFlag);
InFlag = Chain.getValue(1);
}
Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
DAG.getIntPtrConstant(BytesCalleePops, true),
InFlag, dl);
if (!Ins.empty())
InFlag = Chain.getValue(1);
return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
Ins, dl, DAG, InVals);
}
SDValue
PPCTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const {
SelectionDAG &DAG = CLI.DAG;
SDLoc &dl = CLI.DL;
SmallVector<ISD::OutputArg, 32> &Outs = CLI.Outs;
SmallVector<SDValue, 32> &OutVals = CLI.OutVals;
SmallVector<ISD::InputArg, 32> &Ins = CLI.Ins;
SDValue Chain = CLI.Chain;
SDValue Callee = CLI.Callee;
bool &isTailCall = CLI.IsTailCall;
CallingConv::ID CallConv = CLI.CallConv;
bool isVarArg = CLI.IsVarArg;
if (isTailCall)
isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv, isVarArg,
Ins, DAG);
if (PPCSubTarget.isSVR4ABI()) {
if (PPCSubTarget.isPPC64())
return LowerCall_64SVR4(Chain, Callee, CallConv, isVarArg,
isTailCall, Outs, OutVals, Ins,
dl, DAG, InVals);
else
return LowerCall_32SVR4(Chain, Callee, CallConv, isVarArg,
isTailCall, Outs, OutVals, Ins,
dl, DAG, InVals);
}
return LowerCall_Darwin(Chain, Callee, CallConv, isVarArg,
isTailCall, Outs, OutVals, Ins,
dl, DAG, InVals);
}
SDValue
PPCTargetLowering::LowerCall_32SVR4(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
// See PPCTargetLowering::LowerFormalArguments_32SVR4() for a description
// of the 32-bit SVR4 ABI stack frame layout.
assert((CallConv == CallingConv::C ||
CallConv == CallingConv::Fast) && "Unknown calling convention!");
unsigned PtrByteSize = 4;
MachineFunction &MF = DAG.getMachineFunction();
// Mark this function as potentially containing a function that contains a
// tail call. As a consequence the frame pointer will be used for dynamicalloc
// and restoring the callers stack pointer in this functions epilog. This is
// done because by tail calling the called function might overwrite the value
// in this function's (MF) stack pointer stack slot 0(SP).
if (getTargetMachine().Options.GuaranteedTailCallOpt &&
CallConv == CallingConv::Fast)
MF.getInfo<PPCFunctionInfo>()->setHasFastCall();
// Count how many bytes are to be pushed on the stack, including the linkage
// area, parameter list area and the part of the local variable space which
// contains copies of aggregates which are passed by value.
// Assign locations to all of the outgoing arguments.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
getTargetMachine(), ArgLocs, *DAG.getContext());
// Reserve space for the linkage area on the stack.
CCInfo.AllocateStack(PPCFrameLowering::getLinkageSize(false, false), PtrByteSize);
if (isVarArg) {
// Handle fixed and variable vector arguments differently.
// Fixed vector arguments go into registers as long as registers are
// available. Variable vector arguments always go into memory.
unsigned NumArgs = Outs.size();
for (unsigned i = 0; i != NumArgs; ++i) {
MVT ArgVT = Outs[i].VT;
ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
bool Result;
if (Outs[i].IsFixed) {
Result = CC_PPC32_SVR4(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags,
CCInfo);
} else {
Result = CC_PPC32_SVR4_VarArg(i, ArgVT, ArgVT, CCValAssign::Full,
ArgFlags, CCInfo);
}
if (Result) {
#ifndef NDEBUG
errs() << "Call operand #" << i << " has unhandled type "
<< EVT(ArgVT).getEVTString() << "\n";
#endif
llvm_unreachable(0);
}
}
} else {
// All arguments are treated the same.
CCInfo.AnalyzeCallOperands(Outs, CC_PPC32_SVR4);
}
// Assign locations to all of the outgoing aggregate by value arguments.
SmallVector<CCValAssign, 16> ByValArgLocs;
CCState CCByValInfo(CallConv, isVarArg, DAG.getMachineFunction(),
getTargetMachine(), ByValArgLocs, *DAG.getContext());
// Reserve stack space for the allocations in CCInfo.
CCByValInfo.AllocateStack(CCInfo.getNextStackOffset(), PtrByteSize);
CCByValInfo.AnalyzeCallOperands(Outs, CC_PPC32_SVR4_ByVal);
// Size of the linkage area, parameter list area and the part of the local
// space variable where copies of aggregates which are passed by value are
// stored.
unsigned NumBytes = CCByValInfo.getNextStackOffset();
// Calculate by how many bytes the stack has to be adjusted in case of tail
// call optimization.
int SPDiff = CalculateTailCallSPDiff(DAG, isTailCall, NumBytes);
// Adjust the stack pointer for the new arguments...
// These operations are automatically eliminated by the prolog/epilog pass
Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true),
dl);
SDValue CallSeqStart = Chain;
// Load the return address and frame pointer so it can be moved somewhere else
// later.
SDValue LROp, FPOp;
Chain = EmitTailCallLoadFPAndRetAddr(DAG, SPDiff, Chain, LROp, FPOp, false,
dl);
// Set up a copy of the stack pointer for use loading and storing any
// arguments that may not fit in the registers available for argument
// passing.
SDValue StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
SmallVector<TailCallArgumentInfo, 8> TailCallArguments;
SmallVector<SDValue, 8> MemOpChains;
bool seenFloatArg = false;
// Walk the register/memloc assignments, inserting copies/loads.
for (unsigned i = 0, j = 0, e = ArgLocs.size();
i != e;
++i) {
CCValAssign &VA = ArgLocs[i];
SDValue Arg = OutVals[i];
ISD::ArgFlagsTy Flags = Outs[i].Flags;
if (Flags.isByVal()) {
// Argument is an aggregate which is passed by value, thus we need to
// create a copy of it in the local variable space of the current stack
// frame (which is the stack frame of the caller) and pass the address of
// this copy to the callee.
assert((j < ByValArgLocs.size()) && "Index out of bounds!");
CCValAssign &ByValVA = ByValArgLocs[j++];
assert((VA.getValNo() == ByValVA.getValNo()) && "ValNo mismatch!");
// Memory reserved in the local variable space of the callers stack frame.
unsigned LocMemOffset = ByValVA.getLocMemOffset();
SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
// Create a copy of the argument in the local area of the current
// stack frame.
SDValue MemcpyCall =
CreateCopyOfByValArgument(Arg, PtrOff,
CallSeqStart.getNode()->getOperand(0),
Flags, DAG, dl);
// This must go outside the CALLSEQ_START..END.
SDValue NewCallSeqStart = DAG.getCALLSEQ_START(MemcpyCall,
CallSeqStart.getNode()->getOperand(1),
SDLoc(MemcpyCall));
DAG.ReplaceAllUsesWith(CallSeqStart.getNode(),
NewCallSeqStart.getNode());
Chain = CallSeqStart = NewCallSeqStart;
// Pass the address of the aggregate copy on the stack either in a
// physical register or in the parameter list area of the current stack
// frame to the callee.
Arg = PtrOff;
}
if (VA.isRegLoc()) {
seenFloatArg |= VA.getLocVT().isFloatingPoint();
// Put argument in a physical register.
RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
} else {
// Put argument in the parameter list area of the current stack frame.
assert(VA.isMemLoc());
unsigned LocMemOffset = VA.getLocMemOffset();
if (!isTailCall) {
SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
MachinePointerInfo(),
false, false, 0));
} else {
// Calculate and remember argument location.
CalculateTailCallArgDest(DAG, MF, false, Arg, SPDiff, LocMemOffset,
TailCallArguments);
}
}
}
if (!MemOpChains.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOpChains[0], MemOpChains.size());
// Build a sequence of copy-to-reg nodes chained together with token chain
// and flag operands which copy the outgoing args into the appropriate regs.
SDValue InFlag;
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
RegsToPass[i].second, InFlag);
InFlag = Chain.getValue(1);
}
// Set CR bit 6 to true if this is a vararg call with floating args passed in
// registers.
if (isVarArg) {
SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
SDValue Ops[] = { Chain, InFlag };
Chain = DAG.getNode(seenFloatArg ? PPCISD::CR6SET : PPCISD::CR6UNSET,
dl, VTs, Ops, InFlag.getNode() ? 2 : 1);
InFlag = Chain.getValue(1);
}
if (isTailCall)
PrepareTailCall(DAG, InFlag, Chain, dl, false, SPDiff, NumBytes, LROp, FPOp,
false, TailCallArguments);
return FinishCall(CallConv, dl, isTailCall, isVarArg, DAG,
RegsToPass, InFlag, Chain, Callee, SPDiff, NumBytes,
Ins, InVals);
}
// Copy an argument into memory, being careful to do this outside the
// call sequence for the call to which the argument belongs.
SDValue
PPCTargetLowering::createMemcpyOutsideCallSeq(SDValue Arg, SDValue PtrOff,
SDValue CallSeqStart,
ISD::ArgFlagsTy Flags,
SelectionDAG &DAG,
SDLoc dl) const {
SDValue MemcpyCall = CreateCopyOfByValArgument(Arg, PtrOff,
CallSeqStart.getNode()->getOperand(0),
Flags, DAG, dl);
// The MEMCPY must go outside the CALLSEQ_START..END.
SDValue NewCallSeqStart = DAG.getCALLSEQ_START(MemcpyCall,
CallSeqStart.getNode()->getOperand(1),
SDLoc(MemcpyCall));
DAG.ReplaceAllUsesWith(CallSeqStart.getNode(),
NewCallSeqStart.getNode());
return NewCallSeqStart;
}
SDValue
PPCTargetLowering::LowerCall_64SVR4(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
unsigned NumOps = Outs.size();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
unsigned PtrByteSize = 8;
MachineFunction &MF = DAG.getMachineFunction();
// Mark this function as potentially containing a function that contains a
// tail call. As a consequence the frame pointer will be used for dynamicalloc
// and restoring the callers stack pointer in this functions epilog. This is
// done because by tail calling the called function might overwrite the value
// in this function's (MF) stack pointer stack slot 0(SP).
if (getTargetMachine().Options.GuaranteedTailCallOpt &&
CallConv == CallingConv::Fast)
MF.getInfo<PPCFunctionInfo>()->setHasFastCall();
unsigned nAltivecParamsAtEnd = 0;
// Count how many bytes are to be pushed on the stack, including the linkage
// area, and parameter passing area. We start with at least 48 bytes, which
// is reserved space for [SP][CR][LR][3 x unused].
// NOTE: For PPC64, nAltivecParamsAtEnd always remains zero as a result
// of this call.
unsigned NumBytes =
CalculateParameterAndLinkageAreaSize(DAG, true, isVarArg, CallConv,
Outs, OutVals, nAltivecParamsAtEnd);
// Calculate by how many bytes the stack has to be adjusted in case of tail
// call optimization.
int SPDiff = CalculateTailCallSPDiff(DAG, isTailCall, NumBytes);
// To protect arguments on the stack from being clobbered in a tail call,
// force all the loads to happen before doing any other lowering.
if (isTailCall)
Chain = DAG.getStackArgumentTokenFactor(Chain);
// Adjust the stack pointer for the new arguments...
// These operations are automatically eliminated by the prolog/epilog pass
Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true),
dl);
SDValue CallSeqStart = Chain;
// Load the return address and frame pointer so it can be move somewhere else
// later.
SDValue LROp, FPOp;
Chain = EmitTailCallLoadFPAndRetAddr(DAG, SPDiff, Chain, LROp, FPOp, true,
dl);
// Set up a copy of the stack pointer for use loading and storing any
// arguments that may not fit in the registers available for argument
// passing.
SDValue StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
// Figure out which arguments are going to go in registers, and which in
// memory. Also, if this is a vararg function, floating point operations
// must be stored to our stack, and loaded into integer regs as well, if
// any integer regs are available for argument passing.
unsigned ArgOffset = PPCFrameLowering::getLinkageSize(true, true);
unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
static const uint16_t GPR[] = {
PPC::X3, PPC::X4, PPC::X5, PPC::X6,
PPC::X7, PPC::X8, PPC::X9, PPC::X10,
};
static const uint16_t *FPR = GetFPR();
static const uint16_t VR[] = {
PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
};
const unsigned NumGPRs = array_lengthof(GPR);
const unsigned NumFPRs = 13;
const unsigned NumVRs = array_lengthof(VR);
SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
SmallVector<TailCallArgumentInfo, 8> TailCallArguments;
SmallVector<SDValue, 8> MemOpChains;
for (unsigned i = 0; i != NumOps; ++i) {
SDValue Arg = OutVals[i];
ISD::ArgFlagsTy Flags = Outs[i].Flags;
// PtrOff will be used to store the current argument to the stack if a
// register cannot be found for it.
SDValue PtrOff;
PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
// Promote integers to 64-bit values.
if (Arg.getValueType() == MVT::i32) {
// FIXME: Should this use ANY_EXTEND if neither sext nor zext?
unsigned ExtOp = Flags.isSExt() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
Arg = DAG.getNode(ExtOp, dl, MVT::i64, Arg);
}
// FIXME memcpy is used way more than necessary. Correctness first.
// Note: "by value" is code for passing a structure by value, not
// basic types.
if (Flags.isByVal()) {
// Note: Size includes alignment padding, so
// struct x { short a; char b; }
// will have Size = 4. With #pragma pack(1), it will have Size = 3.
// These are the proper values we need for right-justifying the
// aggregate in a parameter register.
unsigned Size = Flags.getByValSize();
// An empty aggregate parameter takes up no storage and no
// registers.
if (Size == 0)
continue;
// All aggregates smaller than 8 bytes must be passed right-justified.
if (Size==1 || Size==2 || Size==4) {
EVT VT = (Size==1) ? MVT::i8 : ((Size==2) ? MVT::i16 : MVT::i32);
if (GPR_idx != NumGPRs) {
SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, PtrVT, Chain, Arg,
MachinePointerInfo(), VT,
false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
ArgOffset += PtrByteSize;
continue;
}
}
if (GPR_idx == NumGPRs && Size < 8) {
SDValue Const = DAG.getConstant(PtrByteSize - Size,
PtrOff.getValueType());
SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, Const);
Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, AddPtr,
CallSeqStart,
Flags, DAG, dl);
ArgOffset += PtrByteSize;
continue;
}
// Copy entire object into memory. There are cases where gcc-generated
// code assumes it is there, even if it could be put entirely into
// registers. (This is not what the doc says.)
// FIXME: The above statement is likely due to a misunderstanding of the
// documents. All arguments must be copied into the parameter area BY
// THE CALLEE in the event that the callee takes the address of any
// formal argument. That has not yet been implemented. However, it is
// reasonable to use the stack area as a staging area for the register
// load.
// Skip this for small aggregates, as we will use the same slot for a
// right-justified copy, below.
if (Size >= 8)
Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, PtrOff,
CallSeqStart,
Flags, DAG, dl);
// When a register is available, pass a small aggregate right-justified.
if (Size < 8 && GPR_idx != NumGPRs) {
// The easiest way to get this right-justified in a register
// is to copy the structure into the rightmost portion of a
// local variable slot, then load the whole slot into the
// register.
// FIXME: The memcpy seems to produce pretty awful code for
// small aggregates, particularly for packed ones.
// FIXME: It would be preferable to use the slot in the
// parameter save area instead of a new local variable.
SDValue Const = DAG.getConstant(8 - Size, PtrOff.getValueType());
SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, Const);
Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, AddPtr,
CallSeqStart,
Flags, DAG, dl);
// Load the slot into the register.
SDValue Load = DAG.getLoad(PtrVT, dl, Chain, PtrOff,
MachinePointerInfo(),
false, false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
// Done with this argument.
ArgOffset += PtrByteSize;
continue;
}
// For aggregates larger than PtrByteSize, copy the pieces of the
// object that fit into registers from the parameter save area.
for (unsigned j=0; j<Size; j+=PtrByteSize) {
SDValue Const = DAG.getConstant(j, PtrOff.getValueType());
SDValue AddArg = DAG.getNode(ISD::ADD, dl, PtrVT, Arg, Const);
if (GPR_idx != NumGPRs) {
SDValue Load = DAG.getLoad(PtrVT, dl, Chain, AddArg,
MachinePointerInfo(),
false, false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
ArgOffset += PtrByteSize;
} else {
ArgOffset += ((Size - j + PtrByteSize-1)/PtrByteSize)*PtrByteSize;
break;
}
}
continue;
}
switch (Arg.getValueType().getSimpleVT().SimpleTy) {
default: llvm_unreachable("Unexpected ValueType for argument!");
case MVT::i32:
case MVT::i64:
if (GPR_idx != NumGPRs) {
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Arg));
} else {
LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
true, isTailCall, false, MemOpChains,
TailCallArguments, dl);
}
ArgOffset += PtrByteSize;
break;
case MVT::f32:
case MVT::f64:
if (FPR_idx != NumFPRs) {
RegsToPass.push_back(std::make_pair(FPR[FPR_idx++], Arg));
if (isVarArg) {
// A single float or an aggregate containing only a single float
// must be passed right-justified in the stack doubleword, and
// in the GPR, if one is available.
SDValue StoreOff;
if (Arg.getValueType().getSimpleVT().SimpleTy == MVT::f32) {
SDValue ConstFour = DAG.getConstant(4, PtrOff.getValueType());
StoreOff = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, ConstFour);
} else
StoreOff = PtrOff;
SDValue Store = DAG.getStore(Chain, dl, Arg, StoreOff,
MachinePointerInfo(), false, false, 0);
MemOpChains.push_back(Store);
// Float varargs are always shadowed in available integer registers
if (GPR_idx != NumGPRs) {
SDValue Load = DAG.getLoad(PtrVT, dl, Store, PtrOff,
MachinePointerInfo(), false, false,
false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
}
} else if (GPR_idx != NumGPRs)
// If we have any FPRs remaining, we may also have GPRs remaining.
++GPR_idx;
} else {
// Single-precision floating-point values are mapped to the
// second (rightmost) word of the stack doubleword.
if (Arg.getValueType() == MVT::f32) {
SDValue ConstFour = DAG.getConstant(4, PtrOff.getValueType());
PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, ConstFour);
}
LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
true, isTailCall, false, MemOpChains,
TailCallArguments, dl);
}
ArgOffset += 8;
break;
case MVT::v4f32:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v16i8:
if (isVarArg) {
// These go aligned on the stack, or in the corresponding R registers
// when within range. The Darwin PPC ABI doc claims they also go in
// V registers; in fact gcc does this only for arguments that are
// prototyped, not for those that match the ... We do it for all
// arguments, seems to work.
while (ArgOffset % 16 !=0) {
ArgOffset += PtrByteSize;
if (GPR_idx != NumGPRs)
GPR_idx++;
}
// We could elide this store in the case where the object fits
// entirely in R registers. Maybe later.
PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr,
DAG.getConstant(ArgOffset, PtrVT));
SDValue Store = DAG.getStore(Chain, dl, Arg, PtrOff,
MachinePointerInfo(), false, false, 0);
MemOpChains.push_back(Store);
if (VR_idx != NumVRs) {
SDValue Load = DAG.getLoad(MVT::v4f32, dl, Store, PtrOff,
MachinePointerInfo(),
false, false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(VR[VR_idx++], Load));
}
ArgOffset += 16;
for (unsigned i=0; i<16; i+=PtrByteSize) {
if (GPR_idx == NumGPRs)
break;
SDValue Ix = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff,
DAG.getConstant(i, PtrVT));
SDValue Load = DAG.getLoad(PtrVT, dl, Store, Ix, MachinePointerInfo(),
false, false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
}
break;
}
// Non-varargs Altivec params generally go in registers, but have
// stack space allocated at the end.
if (VR_idx != NumVRs) {
// Doesn't have GPR space allocated.
RegsToPass.push_back(std::make_pair(VR[VR_idx++], Arg));
} else {
LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
true, isTailCall, true, MemOpChains,
TailCallArguments, dl);
ArgOffset += 16;
}
break;
}
}
if (!MemOpChains.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOpChains[0], MemOpChains.size());
// Check if this is an indirect call (MTCTR/BCTRL).
// See PrepareCall() for more information about calls through function
// pointers in the 64-bit SVR4 ABI.
if (!isTailCall &&
!dyn_cast<GlobalAddressSDNode>(Callee) &&
!dyn_cast<ExternalSymbolSDNode>(Callee) &&
!isBLACompatibleAddress(Callee, DAG)) {
// Load r2 into a virtual register and store it to the TOC save area.
SDValue Val = DAG.getCopyFromReg(Chain, dl, PPC::X2, MVT::i64);
// TOC save area offset.
SDValue PtrOff = DAG.getIntPtrConstant(40);
SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
Chain = DAG.getStore(Val.getValue(1), dl, Val, AddPtr, MachinePointerInfo(),
false, false, 0);
// R12 must contain the address of an indirect callee. This does not
// mean the MTCTR instruction must use R12; it's easier to model this
// as an extra parameter, so do that.
RegsToPass.push_back(std::make_pair((unsigned)PPC::X12, Callee));
}
// Build a sequence of copy-to-reg nodes chained together with token chain
// and flag operands which copy the outgoing args into the appropriate regs.
SDValue InFlag;
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
RegsToPass[i].second, InFlag);
InFlag = Chain.getValue(1);
}
if (isTailCall)
PrepareTailCall(DAG, InFlag, Chain, dl, true, SPDiff, NumBytes, LROp,
FPOp, true, TailCallArguments);
return FinishCall(CallConv, dl, isTailCall, isVarArg, DAG,
RegsToPass, InFlag, Chain, Callee, SPDiff, NumBytes,
Ins, InVals);
}
SDValue
PPCTargetLowering::LowerCall_Darwin(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const {
unsigned NumOps = Outs.size();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
bool isPPC64 = PtrVT == MVT::i64;
unsigned PtrByteSize = isPPC64 ? 8 : 4;
MachineFunction &MF = DAG.getMachineFunction();
// Mark this function as potentially containing a function that contains a
// tail call. As a consequence the frame pointer will be used for dynamicalloc
// and restoring the callers stack pointer in this functions epilog. This is
// done because by tail calling the called function might overwrite the value
// in this function's (MF) stack pointer stack slot 0(SP).
if (getTargetMachine().Options.GuaranteedTailCallOpt &&
CallConv == CallingConv::Fast)
MF.getInfo<PPCFunctionInfo>()->setHasFastCall();
unsigned nAltivecParamsAtEnd = 0;
// Count how many bytes are to be pushed on the stack, including the linkage
// area, and parameter passing area. We start with 24/48 bytes, which is
// prereserved space for [SP][CR][LR][3 x unused].
unsigned NumBytes =
CalculateParameterAndLinkageAreaSize(DAG, isPPC64, isVarArg, CallConv,
Outs, OutVals,
nAltivecParamsAtEnd);
// Calculate by how many bytes the stack has to be adjusted in case of tail
// call optimization.
int SPDiff = CalculateTailCallSPDiff(DAG, isTailCall, NumBytes);
// To protect arguments on the stack from being clobbered in a tail call,
// force all the loads to happen before doing any other lowering.
if (isTailCall)
Chain = DAG.getStackArgumentTokenFactor(Chain);
// Adjust the stack pointer for the new arguments...
// These operations are automatically eliminated by the prolog/epilog pass
Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true),
dl);
SDValue CallSeqStart = Chain;
// Load the return address and frame pointer so it can be move somewhere else
// later.
SDValue LROp, FPOp;
Chain = EmitTailCallLoadFPAndRetAddr(DAG, SPDiff, Chain, LROp, FPOp, true,
dl);
// Set up a copy of the stack pointer for use loading and storing any
// arguments that may not fit in the registers available for argument
// passing.
SDValue StackPtr;
if (isPPC64)
StackPtr = DAG.getRegister(PPC::X1, MVT::i64);
else
StackPtr = DAG.getRegister(PPC::R1, MVT::i32);
// Figure out which arguments are going to go in registers, and which in
// memory. Also, if this is a vararg function, floating point operations
// must be stored to our stack, and loaded into integer regs as well, if
// any integer regs are available for argument passing.
unsigned ArgOffset = PPCFrameLowering::getLinkageSize(isPPC64, true);
unsigned GPR_idx = 0, FPR_idx = 0, VR_idx = 0;
static const uint16_t GPR_32[] = { // 32-bit registers.
PPC::R3, PPC::R4, PPC::R5, PPC::R6,
PPC::R7, PPC::R8, PPC::R9, PPC::R10,
};
static const uint16_t GPR_64[] = { // 64-bit registers.
PPC::X3, PPC::X4, PPC::X5, PPC::X6,
PPC::X7, PPC::X8, PPC::X9, PPC::X10,
};
static const uint16_t *FPR = GetFPR();
static const uint16_t VR[] = {
PPC::V2, PPC::V3, PPC::V4, PPC::V5, PPC::V6, PPC::V7, PPC::V8,
PPC::V9, PPC::V10, PPC::V11, PPC::V12, PPC::V13
};
const unsigned NumGPRs = array_lengthof(GPR_32);
const unsigned NumFPRs = 13;
const unsigned NumVRs = array_lengthof(VR);
const uint16_t *GPR = isPPC64 ? GPR_64 : GPR_32;
SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
SmallVector<TailCallArgumentInfo, 8> TailCallArguments;
SmallVector<SDValue, 8> MemOpChains;
for (unsigned i = 0; i != NumOps; ++i) {
SDValue Arg = OutVals[i];
ISD::ArgFlagsTy Flags = Outs[i].Flags;
// PtrOff will be used to store the current argument to the stack if a
// register cannot be found for it.
SDValue PtrOff;
PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
// On PPC64, promote integers to 64-bit values.
if (isPPC64 && Arg.getValueType() == MVT::i32) {
// FIXME: Should this use ANY_EXTEND if neither sext nor zext?
unsigned ExtOp = Flags.isSExt() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
Arg = DAG.getNode(ExtOp, dl, MVT::i64, Arg);
}
// FIXME memcpy is used way more than necessary. Correctness first.
// Note: "by value" is code for passing a structure by value, not
// basic types.
if (Flags.isByVal()) {
unsigned Size = Flags.getByValSize();
// Very small objects are passed right-justified. Everything else is
// passed left-justified.
if (Size==1 || Size==2) {
EVT VT = (Size==1) ? MVT::i8 : MVT::i16;
if (GPR_idx != NumGPRs) {
SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, PtrVT, Chain, Arg,
MachinePointerInfo(), VT,
false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
ArgOffset += PtrByteSize;
} else {
SDValue Const = DAG.getConstant(PtrByteSize - Size,
PtrOff.getValueType());
SDValue AddPtr = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, Const);
Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, AddPtr,
CallSeqStart,
Flags, DAG, dl);
ArgOffset += PtrByteSize;
}
continue;
}
// Copy entire object into memory. There are cases where gcc-generated
// code assumes it is there, even if it could be put entirely into
// registers. (This is not what the doc says.)
Chain = CallSeqStart = createMemcpyOutsideCallSeq(Arg, PtrOff,
CallSeqStart,
Flags, DAG, dl);
// For small aggregates (Darwin only) and aggregates >= PtrByteSize,
// copy the pieces of the object that fit into registers from the
// parameter save area.
for (unsigned j=0; j<Size; j+=PtrByteSize) {
SDValue Const = DAG.getConstant(j, PtrOff.getValueType());
SDValue AddArg = DAG.getNode(ISD::ADD, dl, PtrVT, Arg, Const);
if (GPR_idx != NumGPRs) {
SDValue Load = DAG.getLoad(PtrVT, dl, Chain, AddArg,
MachinePointerInfo(),
false, false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
ArgOffset += PtrByteSize;
} else {
ArgOffset += ((Size - j + PtrByteSize-1)/PtrByteSize)*PtrByteSize;
break;
}
}
continue;
}
switch (Arg.getValueType().getSimpleVT().SimpleTy) {
default: llvm_unreachable("Unexpected ValueType for argument!");
case MVT::i32:
case MVT::i64:
if (GPR_idx != NumGPRs) {
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Arg));
} else {
LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
isPPC64, isTailCall, false, MemOpChains,
TailCallArguments, dl);
}
ArgOffset += PtrByteSize;
break;
case MVT::f32:
case MVT::f64:
if (FPR_idx != NumFPRs) {
RegsToPass.push_back(std::make_pair(FPR[FPR_idx++], Arg));
if (isVarArg) {
SDValue Store = DAG.getStore(Chain, dl, Arg, PtrOff,
MachinePointerInfo(), false, false, 0);
MemOpChains.push_back(Store);
// Float varargs are always shadowed in available integer registers
if (GPR_idx != NumGPRs) {
SDValue Load = DAG.getLoad(PtrVT, dl, Store, PtrOff,
MachinePointerInfo(), false, false,
false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
}
if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 && !isPPC64){
SDValue ConstFour = DAG.getConstant(4, PtrOff.getValueType());
PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff, ConstFour);
SDValue Load = DAG.getLoad(PtrVT, dl, Store, PtrOff,
MachinePointerInfo(),
false, false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
}
} else {
// If we have any FPRs remaining, we may also have GPRs remaining.
// Args passed in FPRs consume either 1 (f32) or 2 (f64) available
// GPRs.
if (GPR_idx != NumGPRs)
++GPR_idx;
if (GPR_idx != NumGPRs && Arg.getValueType() == MVT::f64 &&
!isPPC64) // PPC64 has 64-bit GPR's obviously :)
++GPR_idx;
}
} else
LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
isPPC64, isTailCall, false, MemOpChains,
TailCallArguments, dl);
if (isPPC64)
ArgOffset += 8;
else
ArgOffset += Arg.getValueType() == MVT::f32 ? 4 : 8;
break;
case MVT::v4f32:
case MVT::v4i32:
case MVT::v8i16:
case MVT::v16i8:
if (isVarArg) {
// These go aligned on the stack, or in the corresponding R registers
// when within range. The Darwin PPC ABI doc claims they also go in
// V registers; in fact gcc does this only for arguments that are
// prototyped, not for those that match the ... We do it for all
// arguments, seems to work.
while (ArgOffset % 16 !=0) {
ArgOffset += PtrByteSize;
if (GPR_idx != NumGPRs)
GPR_idx++;
}
// We could elide this store in the case where the object fits
// entirely in R registers. Maybe later.
PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr,
DAG.getConstant(ArgOffset, PtrVT));
SDValue Store = DAG.getStore(Chain, dl, Arg, PtrOff,
MachinePointerInfo(), false, false, 0);
MemOpChains.push_back(Store);
if (VR_idx != NumVRs) {
SDValue Load = DAG.getLoad(MVT::v4f32, dl, Store, PtrOff,
MachinePointerInfo(),
false, false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(VR[VR_idx++], Load));
}
ArgOffset += 16;
for (unsigned i=0; i<16; i+=PtrByteSize) {
if (GPR_idx == NumGPRs)
break;
SDValue Ix = DAG.getNode(ISD::ADD, dl, PtrVT, PtrOff,
DAG.getConstant(i, PtrVT));
SDValue Load = DAG.getLoad(PtrVT, dl, Store, Ix, MachinePointerInfo(),
false, false, false, 0);
MemOpChains.push_back(Load.getValue(1));
RegsToPass.push_back(std::make_pair(GPR[GPR_idx++], Load));
}
break;
}
// Non-varargs Altivec params generally go in registers, but have
// stack space allocated at the end.
if (VR_idx != NumVRs) {
// Doesn't have GPR space allocated.
RegsToPass.push_back(std::make_pair(VR[VR_idx++], Arg));
} else if (nAltivecParamsAtEnd==0) {
// We are emitting Altivec params in order.
LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
isPPC64, isTailCall, true, MemOpChains,
TailCallArguments, dl);
ArgOffset += 16;
}
break;
}
}
// If all Altivec parameters fit in registers, as they usually do,
// they get stack space following the non-Altivec parameters. We
// don't track this here because nobody below needs it.
// If there are more Altivec parameters than fit in registers emit
// the stores here.
if (!isVarArg && nAltivecParamsAtEnd > NumVRs) {
unsigned j = 0;
// Offset is aligned; skip 1st 12 params which go in V registers.
ArgOffset = ((ArgOffset+15)/16)*16;
ArgOffset += 12*16;
for (unsigned i = 0; i != NumOps; ++i) {
SDValue Arg = OutVals[i];
EVT ArgType = Outs[i].VT;
if (ArgType==MVT::v4f32 || ArgType==MVT::v4i32 ||
ArgType==MVT::v8i16 || ArgType==MVT::v16i8) {
if (++j > NumVRs) {
SDValue PtrOff;
// We are emitting Altivec params in order.
LowerMemOpCallTo(DAG, MF, Chain, Arg, PtrOff, SPDiff, ArgOffset,
isPPC64, isTailCall, true, MemOpChains,
TailCallArguments, dl);
ArgOffset += 16;
}
}
}
}
if (!MemOpChains.empty())
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
&MemOpChains[0], MemOpChains.size());
// On Darwin, R12 must contain the address of an indirect callee. This does
// not mean the MTCTR instruction must use R12; it's easier to model this as
// an extra parameter, so do that.
if (!isTailCall &&
!dyn_cast<GlobalAddressSDNode>(Callee) &&
!dyn_cast<ExternalSymbolSDNode>(Callee) &&
!isBLACompatibleAddress(Callee, DAG))
RegsToPass.push_back(std::make_pair((unsigned)(isPPC64 ? PPC::X12 :
PPC::R12), Callee));
// Build a sequence of copy-to-reg nodes chained together with token chain
// and flag operands which copy the outgoing args into the appropriate regs.
SDValue InFlag;
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
RegsToPass[i].second, InFlag);
InFlag = Chain.getValue(1);
}
if (isTailCall)
PrepareTailCall(DAG, InFlag, Chain, dl, isPPC64, SPDiff, NumBytes, LROp,
FPOp, true, TailCallArguments);
return FinishCall(CallConv, dl, isTailCall, isVarArg, DAG,
RegsToPass, InFlag, Chain, Callee, SPDiff, NumBytes,
Ins, InVals);
}
bool
PPCTargetLowering::CanLowerReturn(CallingConv::ID CallConv,
MachineFunction &MF, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context) const {
SmallVector<CCValAssign, 16> RVLocs;
CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(),
RVLocs, Context);
return CCInfo.CheckReturn(Outs, RetCC_PPC);
}
SDValue
PPCTargetLowering::LowerReturn(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
SDLoc dl, SelectionDAG &DAG) const {
SmallVector<CCValAssign, 16> RVLocs;
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
getTargetMachine(), RVLocs, *DAG.getContext());
CCInfo.AnalyzeReturn(Outs, RetCC_PPC);
SDValue Flag;
SmallVector<SDValue, 4> RetOps(1, Chain);
// Copy the result values into the output registers.
for (unsigned i = 0; i != RVLocs.size(); ++i) {
CCValAssign &VA = RVLocs[i];
assert(VA.isRegLoc() && "Can only return in registers!");
SDValue Arg = OutVals[i];
switch (VA.getLocInfo()) {
default: llvm_unreachable("Unknown loc info!");
case CCValAssign::Full: break;
case CCValAssign::AExt:
Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
break;
case CCValAssign::ZExt:
Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
break;
case CCValAssign::SExt:
Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
break;
}
Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), Arg, Flag);
Flag = Chain.getValue(1);
RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
}
RetOps[0] = Chain; // Update chain.
// Add the flag if we have it.
if (Flag.getNode())
RetOps.push_back(Flag);
return DAG.getNode(PPCISD::RET_FLAG, dl, MVT::Other,
&RetOps[0], RetOps.size());
}
SDValue PPCTargetLowering::LowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG,
const PPCSubtarget &Subtarget) const {
// When we pop the dynamic allocation we need to restore the SP link.
SDLoc dl(Op);
// Get the corect type for pointers.
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
// Construct the stack pointer operand.
bool isPPC64 = Subtarget.isPPC64();
unsigned SP = isPPC64 ? PPC::X1 : PPC::R1;
SDValue StackPtr = DAG.getRegister(SP, PtrVT);
// Get the operands for the STACKRESTORE.
SDValue Chain = Op.getOperand(0);
SDValue SaveSP = Op.getOperand(1);
// Load the old link SP.
SDValue LoadLinkSP = DAG.getLoad(PtrVT, dl, Chain, StackPtr,
MachinePointerInfo(),
false, false, false, 0);
// Restore the stack pointer.
Chain = DAG.getCopyToReg(LoadLinkSP.getValue(1), dl, SP, SaveSP);
// Store the old link SP.
return DAG.getStore(Chain, dl, LoadLinkSP, StackPtr, MachinePointerInfo(),
false, false, 0);
}
SDValue
PPCTargetLowering::getReturnAddrFrameIndex(SelectionDAG & DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
bool isPPC64 = PPCSubTarget.isPPC64();
bool isDarwinABI = PPCSubTarget.isDarwinABI();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
// Get current frame pointer save index. The users of this index will be
// primarily DYNALLOC instructions.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
int RASI = FI->getReturnAddrSaveIndex();
// If the frame pointer save index hasn't been defined yet.
if (!RASI) {
// Find out what the fix offset of the frame pointer save area.
int LROffset = PPCFrameLowering::getReturnSaveOffset(isPPC64, isDarwinABI);
// Allocate the frame index for frame pointer save area.
RASI = MF.getFrameInfo()->CreateFixedObject(isPPC64? 8 : 4, LROffset, true);
// Save the result.
FI->setReturnAddrSaveIndex(RASI);
}
return DAG.getFrameIndex(RASI, PtrVT);
}
SDValue
PPCTargetLowering::getFramePointerFrameIndex(SelectionDAG & DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
bool isPPC64 = PPCSubTarget.isPPC64();
bool isDarwinABI = PPCSubTarget.isDarwinABI();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
// Get current frame pointer save index. The users of this index will be
// primarily DYNALLOC instructions.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
int FPSI = FI->getFramePointerSaveIndex();
// If the frame pointer save index hasn't been defined yet.
if (!FPSI) {
// Find out what the fix offset of the frame pointer save area.
int FPOffset = PPCFrameLowering::getFramePointerSaveOffset(isPPC64,
isDarwinABI);
// Allocate the frame index for frame pointer save area.
FPSI = MF.getFrameInfo()->CreateFixedObject(isPPC64? 8 : 4, FPOffset, true);
// Save the result.
FI->setFramePointerSaveIndex(FPSI);
}
return DAG.getFrameIndex(FPSI, PtrVT);
}
SDValue PPCTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
SelectionDAG &DAG,
const PPCSubtarget &Subtarget) const {
// Get the inputs.
SDValue Chain = Op.getOperand(0);
SDValue Size = Op.getOperand(1);
SDLoc dl(Op);
// Get the corect type for pointers.
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
// Negate the size.
SDValue NegSize = DAG.getNode(ISD::SUB, dl, PtrVT,
DAG.getConstant(0, PtrVT), Size);
// Construct a node for the frame pointer save index.
SDValue FPSIdx = getFramePointerFrameIndex(DAG);
// Build a DYNALLOC node.
SDValue Ops[3] = { Chain, NegSize, FPSIdx };
SDVTList VTs = DAG.getVTList(PtrVT, MVT::Other);
return DAG.getNode(PPCISD::DYNALLOC, dl, VTs, Ops, 3);
}
SDValue PPCTargetLowering::lowerEH_SJLJ_SETJMP(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
return DAG.getNode(PPCISD::EH_SJLJ_SETJMP, DL,
DAG.getVTList(MVT::i32, MVT::Other),
Op.getOperand(0), Op.getOperand(1));
}
SDValue PPCTargetLowering::lowerEH_SJLJ_LONGJMP(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
return DAG.getNode(PPCISD::EH_SJLJ_LONGJMP, DL, MVT::Other,
Op.getOperand(0), Op.getOperand(1));
}
/// LowerSELECT_CC - Lower floating point select_cc's into fsel instruction when
/// possible.
SDValue PPCTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
// Not FP? Not a fsel.
if (!Op.getOperand(0).getValueType().isFloatingPoint() ||
!Op.getOperand(2).getValueType().isFloatingPoint())
return Op;
// We might be able to do better than this under some circumstances, but in
// general, fsel-based lowering of select is a finite-math-only optimization.
// For more information, see section F.3 of the 2.06 ISA specification.
if (!DAG.getTarget().Options.NoInfsFPMath ||
!DAG.getTarget().Options.NoNaNsFPMath)
return Op;
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
EVT ResVT = Op.getValueType();
EVT CmpVT = Op.getOperand(0).getValueType();
SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
SDValue TV = Op.getOperand(2), FV = Op.getOperand(3);
SDLoc dl(Op);
// If the RHS of the comparison is a 0.0, we don't need to do the
// subtraction at all.
SDValue Sel1;
if (isFloatingPointZero(RHS))
switch (CC) {
default: break; // SETUO etc aren't handled by fsel.
case ISD::SETNE:
std::swap(TV, FV);
case ISD::SETEQ:
if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
LHS = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, LHS);
Sel1 = DAG.getNode(PPCISD::FSEL, dl, ResVT, LHS, TV, FV);
if (Sel1.getValueType() == MVT::f32) // Comparison is always 64-bits
Sel1 = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Sel1);
return DAG.getNode(PPCISD::FSEL, dl, ResVT,
DAG.getNode(ISD::FNEG, dl, MVT::f64, LHS), Sel1, FV);
case ISD::SETULT:
case ISD::SETLT:
std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
case ISD::SETOGE:
case ISD::SETGE:
if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
LHS = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, LHS);
return DAG.getNode(PPCISD::FSEL, dl, ResVT, LHS, TV, FV);
case ISD::SETUGT:
case ISD::SETGT:
std::swap(TV, FV); // fsel is natively setge, swap operands for setlt
case ISD::SETOLE:
case ISD::SETLE:
if (LHS.getValueType() == MVT::f32) // Comparison is always 64-bits
LHS = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, LHS);
return DAG.getNode(PPCISD::FSEL, dl, ResVT,
DAG.getNode(ISD::FNEG, dl, MVT::f64, LHS), TV, FV);
}
SDValue Cmp;
switch (CC) {
default: break; // SETUO etc aren't handled by fsel.
case ISD::SETNE:
std::swap(TV, FV);
case ISD::SETEQ:
Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, LHS, RHS);
if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
Sel1 = DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, TV, FV);
if (Sel1.getValueType() == MVT::f32) // Comparison is always 64-bits
Sel1 = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Sel1);
return DAG.getNode(PPCISD::FSEL, dl, ResVT,
DAG.getNode(ISD::FNEG, dl, MVT::f64, Cmp), Sel1, FV);
case ISD::SETULT:
case ISD::SETLT:
Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, LHS, RHS);
if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, FV, TV);
case ISD::SETOGE:
case ISD::SETGE:
Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, LHS, RHS);
if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, TV, FV);
case ISD::SETUGT:
case ISD::SETGT:
Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, RHS, LHS);
if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, FV, TV);
case ISD::SETOLE:
case ISD::SETLE:
Cmp = DAG.getNode(ISD::FSUB, dl, CmpVT, RHS, LHS);
if (Cmp.getValueType() == MVT::f32) // Comparison is always 64-bits
Cmp = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Cmp);
return DAG.getNode(PPCISD::FSEL, dl, ResVT, Cmp, TV, FV);
}
return Op;
}
// FIXME: Split this code up when LegalizeDAGTypes lands.
SDValue PPCTargetLowering::LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG,
SDLoc dl) const {
assert(Op.getOperand(0).getValueType().isFloatingPoint());
SDValue Src = Op.getOperand(0);
if (Src.getValueType() == MVT::f32)
Src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Src);
SDValue Tmp;
switch (Op.getValueType().getSimpleVT().SimpleTy) {
default: llvm_unreachable("Unhandled FP_TO_INT type in custom expander!");
case MVT::i32:
Tmp = DAG.getNode(Op.getOpcode()==ISD::FP_TO_SINT ? PPCISD::FCTIWZ :
(PPCSubTarget.hasFPCVT() ? PPCISD::FCTIWUZ :
PPCISD::FCTIDZ),
dl, MVT::f64, Src);
break;
case MVT::i64:
assert((Op.getOpcode() == ISD::FP_TO_SINT || PPCSubTarget.hasFPCVT()) &&
"i64 FP_TO_UINT is supported only with FPCVT");
Tmp = DAG.getNode(Op.getOpcode()==ISD::FP_TO_SINT ? PPCISD::FCTIDZ :
PPCISD::FCTIDUZ,
dl, MVT::f64, Src);
break;
}
// Convert the FP value to an int value through memory.
bool i32Stack = Op.getValueType() == MVT::i32 && PPCSubTarget.hasSTFIWX() &&
(Op.getOpcode() == ISD::FP_TO_SINT || PPCSubTarget.hasFPCVT());
SDValue FIPtr = DAG.CreateStackTemporary(i32Stack ? MVT::i32 : MVT::f64);
int FI = cast<FrameIndexSDNode>(FIPtr)->getIndex();
MachinePointerInfo MPI = MachinePointerInfo::getFixedStack(FI);
// Emit a store to the stack slot.
SDValue Chain;
if (i32Stack) {
MachineFunction &MF = DAG.getMachineFunction();
MachineMemOperand *MMO =
MF.getMachineMemOperand(MPI, MachineMemOperand::MOStore, 4, 4);
SDValue Ops[] = { DAG.getEntryNode(), Tmp, FIPtr };
Chain = DAG.getMemIntrinsicNode(PPCISD::STFIWX, dl,
DAG.getVTList(MVT::Other), Ops, array_lengthof(Ops),
MVT::i32, MMO);
} else
Chain = DAG.getStore(DAG.getEntryNode(), dl, Tmp, FIPtr,
MPI, false, false, 0);
// Result is a load from the stack slot. If loading 4 bytes, make sure to
// add in a bias.
if (Op.getValueType() == MVT::i32 && !i32Stack) {
FIPtr = DAG.getNode(ISD::ADD, dl, FIPtr.getValueType(), FIPtr,
DAG.getConstant(4, FIPtr.getValueType()));
MPI = MachinePointerInfo();
}
return DAG.getLoad(Op.getValueType(), dl, Chain, FIPtr, MPI,
false, false, false, 0);
}
SDValue PPCTargetLowering::LowerINT_TO_FP(SDValue Op,
SelectionDAG &DAG) const {
SDLoc dl(Op);
// Don't handle ppc_fp128 here; let it be lowered to a libcall.
if (Op.getValueType() != MVT::f32 && Op.getValueType() != MVT::f64)
return SDValue();
assert((Op.getOpcode() == ISD::SINT_TO_FP || PPCSubTarget.hasFPCVT()) &&
"UINT_TO_FP is supported only with FPCVT");
// If we have FCFIDS, then use it when converting to single-precision.
// Otherwise, convert to double-precision and then round.
unsigned FCFOp = (PPCSubTarget.hasFPCVT() && Op.getValueType() == MVT::f32) ?
(Op.getOpcode() == ISD::UINT_TO_FP ?
PPCISD::FCFIDUS : PPCISD::FCFIDS) :
(Op.getOpcode() == ISD::UINT_TO_FP ?
PPCISD::FCFIDU : PPCISD::FCFID);
MVT FCFTy = (PPCSubTarget.hasFPCVT() && Op.getValueType() == MVT::f32) ?
MVT::f32 : MVT::f64;
if (Op.getOperand(0).getValueType() == MVT::i64) {
SDValue SINT = Op.getOperand(0);
// When converting to single-precision, we actually need to convert
// to double-precision first and then round to single-precision.
// To avoid double-rounding effects during that operation, we have
// to prepare the input operand. Bits that might be truncated when
// converting to double-precision are replaced by a bit that won't
// be lost at this stage, but is below the single-precision rounding
// position.
//
// However, if -enable-unsafe-fp-math is in effect, accept double
// rounding to avoid the extra overhead.
if (Op.getValueType() == MVT::f32 &&
!PPCSubTarget.hasFPCVT() &&
!DAG.getTarget().Options.UnsafeFPMath) {
// Twiddle input to make sure the low 11 bits are zero. (If this
// is the case, we are guaranteed the value will fit into the 53 bit
// mantissa of an IEEE double-precision value without rounding.)
// If any of those low 11 bits were not zero originally, make sure
// bit 12 (value 2048) is set instead, so that the final rounding
// to single-precision gets the correct result.
SDValue Round = DAG.getNode(ISD::AND, dl, MVT::i64,
SINT, DAG.getConstant(2047, MVT::i64));
Round = DAG.getNode(ISD::ADD, dl, MVT::i64,
Round, DAG.getConstant(2047, MVT::i64));
Round = DAG.getNode(ISD::OR, dl, MVT::i64, Round, SINT);
Round = DAG.getNode(ISD::AND, dl, MVT::i64,
Round, DAG.getConstant(-2048, MVT::i64));
// However, we cannot use that value unconditionally: if the magnitude
// of the input value is small, the bit-twiddling we did above might
// end up visibly changing the output. Fortunately, in that case, we
// don't need to twiddle bits since the original input will convert
// exactly to double-precision floating-point already. Therefore,
// construct a conditional to use the original value if the top 11
// bits are all sign-bit copies, and use the rounded value computed
// above otherwise.
SDValue Cond = DAG.getNode(ISD::SRA, dl, MVT::i64,
SINT, DAG.getConstant(53, MVT::i32));
Cond = DAG.getNode(ISD::ADD, dl, MVT::i64,
Cond, DAG.getConstant(1, MVT::i64));
Cond = DAG.getSetCC(dl, MVT::i32,
Cond, DAG.getConstant(1, MVT::i64), ISD::SETUGT);
SINT = DAG.getNode(ISD::SELECT, dl, MVT::i64, Cond, Round, SINT);
}
SDValue Bits = DAG.getNode(ISD::BITCAST, dl, MVT::f64, SINT);
SDValue FP = DAG.getNode(FCFOp, dl, FCFTy, Bits);
if (Op.getValueType() == MVT::f32 && !PPCSubTarget.hasFPCVT())
FP = DAG.getNode(ISD::FP_ROUND, dl,
MVT::f32, FP, DAG.getIntPtrConstant(0));
return FP;
}
assert(Op.getOperand(0).getValueType() == MVT::i32 &&
"Unhandled INT_TO_FP type in custom expander!");
// Since we only generate this in 64-bit mode, we can take advantage of
// 64-bit registers. In particular, sign extend the input value into the
// 64-bit register with extsw, store the WHOLE 64-bit value into the stack
// then lfd it and fcfid it.
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *FrameInfo = MF.getFrameInfo();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
SDValue Ld;
if (PPCSubTarget.hasLFIWAX() || PPCSubTarget.hasFPCVT()) {
int FrameIdx = FrameInfo->CreateStackObject(4, 4, false);
SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0), FIdx,
MachinePointerInfo::getFixedStack(FrameIdx),
false, false, 0);
assert(cast<StoreSDNode>(Store)->getMemoryVT() == MVT::i32 &&
"Expected an i32 store");
MachineMemOperand *MMO =
MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FrameIdx),
MachineMemOperand::MOLoad, 4, 4);
SDValue Ops[] = { Store, FIdx };
Ld = DAG.getMemIntrinsicNode(Op.getOpcode() == ISD::UINT_TO_FP ?
PPCISD::LFIWZX : PPCISD::LFIWAX,
dl, DAG.getVTList(MVT::f64, MVT::Other),
Ops, 2, MVT::i32, MMO);
} else {
assert(PPCSubTarget.isPPC64() &&
"i32->FP without LFIWAX supported only on PPC64");
int FrameIdx = FrameInfo->CreateStackObject(8, 8, false);
SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
SDValue Ext64 = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::i64,
Op.getOperand(0));
// STD the extended value into the stack slot.
SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Ext64, FIdx,
MachinePointerInfo::getFixedStack(FrameIdx),
false, false, 0);
// Load the value as a double.
Ld = DAG.getLoad(MVT::f64, dl, Store, FIdx,
MachinePointerInfo::getFixedStack(FrameIdx),
false, false, false, 0);
}
// FCFID it and return it.
SDValue FP = DAG.getNode(FCFOp, dl, FCFTy, Ld);
if (Op.getValueType() == MVT::f32 && !PPCSubTarget.hasFPCVT())
FP = DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, FP, DAG.getIntPtrConstant(0));
return FP;
}
SDValue PPCTargetLowering::LowerFLT_ROUNDS_(SDValue Op,
SelectionDAG &DAG) const {
SDLoc dl(Op);
/*
The rounding mode is in bits 30:31 of FPSR, and has the following
settings:
00 Round to nearest
01 Round to 0
10 Round to +inf
11 Round to -inf
FLT_ROUNDS, on the other hand, expects the following:
-1 Undefined
0 Round to 0
1 Round to nearest
2 Round to +inf
3 Round to -inf
To perform the conversion, we do:
((FPSCR & 0x3) ^ ((~FPSCR & 0x3) >> 1))
*/
MachineFunction &MF = DAG.getMachineFunction();
EVT VT = Op.getValueType();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
SDValue MFFSreg, InFlag;
// Save FP Control Word to register
EVT NodeTys[] = {
MVT::f64, // return register
MVT::Glue // unused in this context
};
SDValue Chain = DAG.getNode(PPCISD::MFFS, dl, NodeTys, &InFlag, 0);
// Save FP register to stack slot
int SSFI = MF.getFrameInfo()->CreateStackObject(8, 8, false);
SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Chain,
StackSlot, MachinePointerInfo(), false, false,0);
// Load FP Control Word from low 32 bits of stack slot.
SDValue Four = DAG.getConstant(4, PtrVT);
SDValue Addr = DAG.getNode(ISD::ADD, dl, PtrVT, StackSlot, Four);
SDValue CWD = DAG.getLoad(MVT::i32, dl, Store, Addr, MachinePointerInfo(),
false, false, false, 0);
// Transform as necessary
SDValue CWD1 =
DAG.getNode(ISD::AND, dl, MVT::i32,
CWD, DAG.getConstant(3, MVT::i32));
SDValue CWD2 =
DAG.getNode(ISD::SRL, dl, MVT::i32,
DAG.getNode(ISD::AND, dl, MVT::i32,
DAG.getNode(ISD::XOR, dl, MVT::i32,
CWD, DAG.getConstant(3, MVT::i32)),
DAG.getConstant(3, MVT::i32)),
DAG.getConstant(1, MVT::i32));
SDValue RetVal =
DAG.getNode(ISD::XOR, dl, MVT::i32, CWD1, CWD2);
return DAG.getNode((VT.getSizeInBits() < 16 ?
ISD::TRUNCATE : ISD::ZERO_EXTEND), dl, VT, RetVal);
}
SDValue PPCTargetLowering::LowerSHL_PARTS(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
unsigned BitWidth = VT.getSizeInBits();
SDLoc dl(Op);
assert(Op.getNumOperands() == 3 &&
VT == Op.getOperand(1).getValueType() &&
"Unexpected SHL!");
// Expand into a bunch of logical ops. Note that these ops
// depend on the PPC behavior for oversized shift amounts.
SDValue Lo = Op.getOperand(0);
SDValue Hi = Op.getOperand(1);
SDValue Amt = Op.getOperand(2);
EVT AmtVT = Amt.getValueType();
SDValue Tmp1 = DAG.getNode(ISD::SUB, dl, AmtVT,
DAG.getConstant(BitWidth, AmtVT), Amt);
SDValue Tmp2 = DAG.getNode(PPCISD::SHL, dl, VT, Hi, Amt);
SDValue Tmp3 = DAG.getNode(PPCISD::SRL, dl, VT, Lo, Tmp1);
SDValue Tmp4 = DAG.getNode(ISD::OR , dl, VT, Tmp2, Tmp3);
SDValue Tmp5 = DAG.getNode(ISD::ADD, dl, AmtVT, Amt,
DAG.getConstant(-BitWidth, AmtVT));
SDValue Tmp6 = DAG.getNode(PPCISD::SHL, dl, VT, Lo, Tmp5);
SDValue OutHi = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp6);
SDValue OutLo = DAG.getNode(PPCISD::SHL, dl, VT, Lo, Amt);
SDValue OutOps[] = { OutLo, OutHi };
return DAG.getMergeValues(OutOps, 2, dl);
}
SDValue PPCTargetLowering::LowerSRL_PARTS(SDValue Op, SelectionDAG &DAG) const {
EVT VT = Op.getValueType();
SDLoc dl(Op);
unsigned BitWidth = VT.getSizeInBits();
assert(Op.getNumOperands() == 3 &&
VT == Op.getOperand(1).getValueType() &&
"Unexpected SRL!");
// Expand into a bunch of logical ops. Note that these ops
// depend on the PPC behavior for oversized shift amounts.
SDValue Lo = Op.getOperand(0);
SDValue Hi = Op.getOperand(1);
SDValue Amt = Op.getOperand(2);
EVT AmtVT = Amt.getValueType();
SDValue Tmp1 = DAG.getNode(ISD::SUB, dl, AmtVT,
DAG.getConstant(BitWidth, AmtVT), Amt);
SDValue Tmp2 = DAG.getNode(PPCISD::SRL, dl, VT, Lo, Amt);
SDValue Tmp3 = DAG.getNode(PPCISD::SHL, dl, VT, Hi, Tmp1);
SDValue Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp3);
SDValue Tmp5 = DAG.getNode(ISD::ADD, dl, AmtVT, Amt,
DAG.getConstant(-BitWidth, AmtVT));
SDValue Tmp6 = DAG.getNode(PPCISD::SRL, dl, VT, Hi, Tmp5);
SDValue OutLo = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp6);
SDValue OutHi = DAG.getNode(PPCISD::SRL, dl, VT, Hi, Amt);
SDValue OutOps[] = { OutLo, OutHi };
return DAG.getMergeValues(OutOps, 2, dl);
}
SDValue PPCTargetLowering::LowerSRA_PARTS(SDValue Op, SelectionDAG &DAG) const {
SDLoc dl(Op);
EVT VT = Op.getValueType();
unsigned BitWidth = VT.getSizeInBits();
assert(Op.getNumOperands() == 3 &&
VT == Op.getOperand(1).getValueType() &&
"Unexpected SRA!");
// Expand into a bunch of logical ops, followed by a select_cc.
SDValue Lo = Op.getOperand(0);
SDValue Hi = Op.getOperand(1);
SDValue Amt = Op.getOperand(2);
EVT AmtVT = Amt.getValueType();
SDValue Tmp1 = DAG.getNode(ISD::SUB, dl, AmtVT,
DAG.getConstant(BitWidth, AmtVT), Amt);
SDValue Tmp2 = DAG.getNode(PPCISD::SRL, dl, VT, Lo, Amt);
SDValue Tmp3 = DAG.getNode(PPCISD::SHL, dl, VT, Hi, Tmp1);
SDValue Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp3);
SDValue Tmp5 = DAG.getNode(ISD::ADD, dl, AmtVT, Amt,
DAG.getConstant(-BitWidth, AmtVT));
SDValue Tmp6 = DAG.getNode(PPCISD::SRA, dl, VT, Hi, Tmp5);
SDValue OutHi = DAG.getNode(PPCISD::SRA, dl, VT, Hi, Amt);
SDValue OutLo = DAG.getSelectCC(dl, Tmp5, DAG.getConstant(0, AmtVT),
Tmp4, Tmp6, ISD::SETLE);
SDValue OutOps[] = { OutLo, OutHi };
return DAG.getMergeValues(OutOps, 2, dl);
}
//===----------------------------------------------------------------------===//
// Vector related lowering.
//
/// BuildSplatI - Build a canonical splati of Val with an element size of
/// SplatSize. Cast the result to VT.
static SDValue BuildSplatI(int Val, unsigned SplatSize, EVT VT,
SelectionDAG &DAG, SDLoc dl) {
assert(Val >= -16 && Val <= 15 && "vsplti is out of range!");
static const EVT VTys[] = { // canonical VT to use for each size.
MVT::v16i8, MVT::v8i16, MVT::Other, MVT::v4i32
};
EVT ReqVT = VT != MVT::Other ? VT : VTys[SplatSize-1];
// Force vspltis[hw] -1 to vspltisb -1 to canonicalize.
if (Val == -1)
SplatSize = 1;
EVT CanonicalVT = VTys[SplatSize-1];
// Build a canonical splat for this value.
SDValue Elt = DAG.getConstant(Val, MVT::i32);
SmallVector<SDValue, 8> Ops;
Ops.assign(CanonicalVT.getVectorNumElements(), Elt);
SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, dl, CanonicalVT,
&Ops[0], Ops.size());
return DAG.getNode(ISD::BITCAST, dl, ReqVT, Res);
}
/// BuildIntrinsicOp - Return a unary operator intrinsic node with the
/// specified intrinsic ID.
static SDValue BuildIntrinsicOp(unsigned IID, SDValue Op,
SelectionDAG &DAG, SDLoc dl,
EVT DestVT = MVT::Other) {
if (DestVT == MVT::Other) DestVT = Op.getValueType();
return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, DestVT,
DAG.getConstant(IID, MVT::i32), Op);
}
/// BuildIntrinsicOp - Return a binary operator intrinsic node with the
/// specified intrinsic ID.
static SDValue BuildIntrinsicOp(unsigned IID, SDValue LHS, SDValue RHS,
SelectionDAG &DAG, SDLoc dl,
EVT DestVT = MVT::Other) {
if (DestVT == MVT::Other) DestVT = LHS.getValueType();
return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, DestVT,
DAG.getConstant(IID, MVT::i32), LHS, RHS);
}
/// BuildIntrinsicOp - Return a ternary operator intrinsic node with the
/// specified intrinsic ID.
static SDValue BuildIntrinsicOp(unsigned IID, SDValue Op0, SDValue Op1,
SDValue Op2, SelectionDAG &DAG,
SDLoc dl, EVT DestVT = MVT::Other) {
if (DestVT == MVT::Other) DestVT = Op0.getValueType();
return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, DestVT,
DAG.getConstant(IID, MVT::i32), Op0, Op1, Op2);
}
/// BuildVSLDOI - Return a VECTOR_SHUFFLE that is a vsldoi of the specified
/// amount. The result has the specified value type.
static SDValue BuildVSLDOI(SDValue LHS, SDValue RHS, unsigned Amt,
EVT VT, SelectionDAG &DAG, SDLoc dl) {
// Force LHS/RHS to be the right type.
LHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, LHS);
RHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, RHS);
int Ops[16];
for (unsigned i = 0; i != 16; ++i)
Ops[i] = i + Amt;
SDValue T = DAG.getVectorShuffle(MVT::v16i8, dl, LHS, RHS, Ops);
return DAG.getNode(ISD::BITCAST, dl, VT, T);
}
// If this is a case we can't handle, return null and let the default
// expansion code take care of it. If we CAN select this case, and if it
// selects to a single instruction, return Op. Otherwise, if we can codegen
// this case more efficiently than a constant pool load, lower it to the
// sequence of ops that should be used.
SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op,
SelectionDAG &DAG) const {
SDLoc dl(Op);
BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
assert(BVN != 0 && "Expected a BuildVectorSDNode in LowerBUILD_VECTOR");
// Check if this is a splat of a constant value.
APInt APSplatBits, APSplatUndef;
unsigned SplatBitSize;
bool HasAnyUndefs;
if (! BVN->isConstantSplat(APSplatBits, APSplatUndef, SplatBitSize,
HasAnyUndefs, 0, true) || SplatBitSize > 32)
return SDValue();
unsigned SplatBits = APSplatBits.getZExtValue();
unsigned SplatUndef = APSplatUndef.getZExtValue();
unsigned SplatSize = SplatBitSize / 8;
// First, handle single instruction cases.
// All zeros?
if (SplatBits == 0) {
// Canonicalize all zero vectors to be v4i32.
if (Op.getValueType() != MVT::v4i32 || HasAnyUndefs) {
SDValue Z = DAG.getConstant(0, MVT::i32);
Z = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Z, Z, Z, Z);
Op = DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Z);
}
return Op;
}
// If the sign extended value is in the range [-16,15], use VSPLTI[bhw].
int32_t SextVal= (int32_t(SplatBits << (32-SplatBitSize)) >>
(32-SplatBitSize));
if (SextVal >= -16 && SextVal <= 15)
return BuildSplatI(SextVal, SplatSize, Op.getValueType(), DAG, dl);
// Two instruction sequences.
// If this value is in the range [-32,30] and is even, use:
// VSPLTI[bhw](val/2) + VSPLTI[bhw](val/2)
// If this value is in the range [17,31] and is odd, use:
// VSPLTI[bhw](val-16) - VSPLTI[bhw](-16)
// If this value is in the range [-31,-17] and is odd, use:
// VSPLTI[bhw](val+16) + VSPLTI[bhw](-16)
// Note the last two are three-instruction sequences.
if (SextVal >= -32 && SextVal <= 31) {
// To avoid having these optimizations undone by constant folding,
// we convert to a pseudo that will be expanded later into one of
// the above forms.
SDValue Elt = DAG.getConstant(SextVal, MVT::i32);
EVT VT = Op.getValueType();
int Size = VT == MVT::v16i8 ? 1 : (VT == MVT::v8i16 ? 2 : 4);
SDValue EltSize = DAG.getConstant(Size, MVT::i32);
return DAG.getNode(PPCISD::VADD_SPLAT, dl, VT, Elt, EltSize);
}
// If this is 0x8000_0000 x 4, turn into vspltisw + vslw. If it is
// 0x7FFF_FFFF x 4, turn it into not(0x8000_0000). This is important
// for fneg/fabs.
if (SplatSize == 4 && SplatBits == (0x7FFFFFFF&~SplatUndef)) {
// Make -1 and vspltisw -1:
SDValue OnesV = BuildSplatI(-1, 4, MVT::v4i32, DAG, dl);
// Make the VSLW intrinsic, computing 0x8000_0000.
SDValue Res = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, OnesV,
OnesV, DAG, dl);
// xor by OnesV to invert it.
Res = DAG.getNode(ISD::XOR, dl, MVT::v4i32, Res, OnesV);
return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
}
// Check to see if this is a wide variety of vsplti*, binop self cases.
static const signed char SplatCsts[] = {
-1, 1, -2, 2, -3, 3, -4, 4, -5, 5, -6, 6, -7, 7,
-8, 8, -9, 9, -10, 10, -11, 11, -12, 12, -13, 13, 14, -14, 15, -15, -16
};
for (unsigned idx = 0; idx < array_lengthof(SplatCsts); ++idx) {
// Indirect through the SplatCsts array so that we favor 'vsplti -1' for
// cases which are ambiguous (e.g. formation of 0x8000_0000). 'vsplti -1'
int i = SplatCsts[idx];
// Figure out what shift amount will be used by altivec if shifted by i in
// this splat size.
unsigned TypeShiftAmt = i & (SplatBitSize-1);
// vsplti + shl self.
if (SextVal == (int)((unsigned)i << TypeShiftAmt)) {
SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
static const unsigned IIDs[] = { // Intrinsic to use for each size.
Intrinsic::ppc_altivec_vslb, Intrinsic::ppc_altivec_vslh, 0,
Intrinsic::ppc_altivec_vslw
};
Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
}
// vsplti + srl self.
if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
static const unsigned IIDs[] = { // Intrinsic to use for each size.
Intrinsic::ppc_altivec_vsrb, Intrinsic::ppc_altivec_vsrh, 0,
Intrinsic::ppc_altivec_vsrw
};
Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
}
// vsplti + sra self.
if (SextVal == (int)((unsigned)i >> TypeShiftAmt)) {
SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
static const unsigned IIDs[] = { // Intrinsic to use for each size.
Intrinsic::ppc_altivec_vsrab, Intrinsic::ppc_altivec_vsrah, 0,
Intrinsic::ppc_altivec_vsraw
};
Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
}
// vsplti + rol self.
if (SextVal == (int)(((unsigned)i << TypeShiftAmt) |
((unsigned)i >> (SplatBitSize-TypeShiftAmt)))) {
SDValue Res = BuildSplatI(i, SplatSize, MVT::Other, DAG, dl);
static const unsigned IIDs[] = { // Intrinsic to use for each size.
Intrinsic::ppc_altivec_vrlb, Intrinsic::ppc_altivec_vrlh, 0,
Intrinsic::ppc_altivec_vrlw
};
Res = BuildIntrinsicOp(IIDs[SplatSize-1], Res, Res, DAG, dl);
return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Res);
}
// t = vsplti c, result = vsldoi t, t, 1
if (SextVal == (int)(((unsigned)i << 8) | (i < 0 ? 0xFF : 0))) {
SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG, dl);
return BuildVSLDOI(T, T, 1, Op.getValueType(), DAG, dl);
}
// t = vsplti c, result = vsldoi t, t, 2
if (SextVal == (int)(((unsigned)i << 16) | (i < 0 ? 0xFFFF : 0))) {
SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG, dl);
return BuildVSLDOI(T, T, 2, Op.getValueType(), DAG, dl);
}
// t = vsplti c, result = vsldoi t, t, 3
if (SextVal == (int)(((unsigned)i << 24) | (i < 0 ? 0xFFFFFF : 0))) {
SDValue T = BuildSplatI(i, SplatSize, MVT::v16i8, DAG, dl);
return BuildVSLDOI(T, T, 3, Op.getValueType(), DAG, dl);
}
}
return SDValue();
}
/// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
/// the specified operations to build the shuffle.
static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
SDValue RHS, SelectionDAG &DAG,
SDLoc dl) {
unsigned OpNum = (PFEntry >> 26) & 0x0F;
unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
enum {
OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
OP_VMRGHW,
OP_VMRGLW,
OP_VSPLTISW0,
OP_VSPLTISW1,
OP_VSPLTISW2,
OP_VSPLTISW3,
OP_VSLDOI4,
OP_VSLDOI8,
OP_VSLDOI12
};
if (OpNum == OP_COPY) {
if (LHSID == (1*9+2)*9+3) return LHS;
assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
return RHS;
}
SDValue OpLHS, OpRHS;
OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
int ShufIdxs[16];
switch (OpNum) {
default: llvm_unreachable("Unknown i32 permute!");
case OP_VMRGHW:
ShufIdxs[ 0] = 0; ShufIdxs[ 1] = 1; ShufIdxs[ 2] = 2; ShufIdxs[ 3] = 3;
ShufIdxs[ 4] = 16; ShufIdxs[ 5] = 17; ShufIdxs[ 6] = 18; ShufIdxs[ 7] = 19;
ShufIdxs[ 8] = 4; ShufIdxs[ 9] = 5; ShufIdxs[10] = 6; ShufIdxs[11] = 7;
ShufIdxs[12] = 20; ShufIdxs[13] = 21; ShufIdxs[14] = 22; ShufIdxs[15] = 23;
break;
case OP_VMRGLW:
ShufIdxs[ 0] = 8; ShufIdxs[ 1] = 9; ShufIdxs[ 2] = 10; ShufIdxs[ 3] = 11;
ShufIdxs[ 4] = 24; ShufIdxs[ 5] = 25; ShufIdxs[ 6] = 26; ShufIdxs[ 7] = 27;
ShufIdxs[ 8] = 12; ShufIdxs[ 9] = 13; ShufIdxs[10] = 14; ShufIdxs[11] = 15;
ShufIdxs[12] = 28; ShufIdxs[13] = 29; ShufIdxs[14] = 30; ShufIdxs[15] = 31;
break;
case OP_VSPLTISW0:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = (i&3)+0;
break;
case OP_VSPLTISW1:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = (i&3)+4;
break;
case OP_VSPLTISW2:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = (i&3)+8;
break;
case OP_VSPLTISW3:
for (unsigned i = 0; i != 16; ++i)
ShufIdxs[i] = (i&3)+12;
break;
case OP_VSLDOI4:
return BuildVSLDOI(OpLHS, OpRHS, 4, OpLHS.getValueType(), DAG, dl);
case OP_VSLDOI8:
return BuildVSLDOI(OpLHS, OpRHS, 8, OpLHS.getValueType(), DAG, dl);
case OP_VSLDOI12:
return BuildVSLDOI(OpLHS, OpRHS, 12, OpLHS.getValueType(), DAG, dl);
}
EVT VT = OpLHS.getValueType();
OpLHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpLHS);
OpRHS = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OpRHS);
SDValue T = DAG.getVectorShuffle(MVT::v16i8, dl, OpLHS, OpRHS, ShufIdxs);
return DAG.getNode(ISD::BITCAST, dl, VT, T);
}
/// LowerVECTOR_SHUFFLE - Return the code we lower for VECTOR_SHUFFLE. If this
/// is a shuffle we can handle in a single instruction, return it. Otherwise,
/// return the code it can be lowered into. Worst case, it can always be
/// lowered into a vperm.
SDValue PPCTargetLowering::LowerVECTOR_SHUFFLE(SDValue Op,
SelectionDAG &DAG) const {
SDLoc dl(Op);
SDValue V1 = Op.getOperand(0);
SDValue V2 = Op.getOperand(1);
ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
EVT VT = Op.getValueType();
// Cases that are handled by instructions that take permute immediates
// (such as vsplt*) should be left as VECTOR_SHUFFLE nodes so they can be
// selected by the instruction selector.
if (V2.getOpcode() == ISD::UNDEF) {
if (PPC::isSplatShuffleMask(SVOp, 1) ||
PPC::isSplatShuffleMask(SVOp, 2) ||
PPC::isSplatShuffleMask(SVOp, 4) ||
PPC::isVPKUWUMShuffleMask(SVOp, true) ||
PPC::isVPKUHUMShuffleMask(SVOp, true) ||
PPC::isVSLDOIShuffleMask(SVOp, true) != -1 ||
PPC::isVMRGLShuffleMask(SVOp, 1, true) ||
PPC::isVMRGLShuffleMask(SVOp, 2, true) ||
PPC::isVMRGLShuffleMask(SVOp, 4, true) ||
PPC::isVMRGHShuffleMask(SVOp, 1, true) ||
PPC::isVMRGHShuffleMask(SVOp, 2, true) ||
PPC::isVMRGHShuffleMask(SVOp, 4, true)) {
return Op;
}
}
// Altivec has a variety of "shuffle immediates" that take two vector inputs
// and produce a fixed permutation. If any of these match, do not lower to
// VPERM.
if (PPC::isVPKUWUMShuffleMask(SVOp, false) ||
PPC::isVPKUHUMShuffleMask(SVOp, false) ||
PPC::isVSLDOIShuffleMask(SVOp, false) != -1 ||
PPC::isVMRGLShuffleMask(SVOp, 1, false) ||
PPC::isVMRGLShuffleMask(SVOp, 2, false) ||
PPC::isVMRGLShuffleMask(SVOp, 4, false) ||
PPC::isVMRGHShuffleMask(SVOp, 1, false) ||
PPC::isVMRGHShuffleMask(SVOp, 2, false) ||
PPC::isVMRGHShuffleMask(SVOp, 4, false))
return Op;
// Check to see if this is a shuffle of 4-byte values. If so, we can use our
// perfect shuffle table to emit an optimal matching sequence.
ArrayRef<int> PermMask = SVOp->getMask();
unsigned PFIndexes[4];
bool isFourElementShuffle = true;
for (unsigned i = 0; i != 4 && isFourElementShuffle; ++i) { // Element number
unsigned EltNo = 8; // Start out undef.
for (unsigned j = 0; j != 4; ++j) { // Intra-element byte.
if (PermMask[i*4+j] < 0)
continue; // Undef, ignore it.
unsigned ByteSource = PermMask[i*4+j];
if ((ByteSource & 3) != j) {
isFourElementShuffle = false;
break;
}
if (EltNo == 8) {
EltNo = ByteSource/4;
} else if (EltNo != ByteSource/4) {
isFourElementShuffle = false;
break;
}
}
PFIndexes[i] = EltNo;
}
// If this shuffle can be expressed as a shuffle of 4-byte elements, use the
// perfect shuffle vector to determine if it is cost effective to do this as
// discrete instructions, or whether we should use a vperm.
if (isFourElementShuffle) {
// Compute the index in the perfect shuffle table.
unsigned PFTableIndex =
PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
unsigned Cost = (PFEntry >> 30);
// Determining when to avoid vperm is tricky. Many things affect the cost
// of vperm, particularly how many times the perm mask needs to be computed.
// For example, if the perm mask can be hoisted out of a loop or is already
// used (perhaps because there are multiple permutes with the same shuffle
// mask?) the vperm has a cost of 1. OTOH, hoisting the permute mask out of
// the loop requires an extra register.
//
// As a compromise, we only emit discrete instructions if the shuffle can be
// generated in 3 or fewer operations. When we have loop information
// available, if this block is within a loop, we should avoid using vperm
// for 3-operation perms and use a constant pool load instead.
if (Cost < 3)
return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
}
// Lower this to a VPERM(V1, V2, V3) expression, where V3 is a constant
// vector that will get spilled to the constant pool.
if (V2.getOpcode() == ISD::UNDEF) V2 = V1;
// The SHUFFLE_VECTOR mask is almost exactly what we want for vperm, except
// that it is in input element units, not in bytes. Convert now.
EVT EltVT = V1.getValueType().getVectorElementType();
unsigned BytesPerElement = EltVT.getSizeInBits()/8;
SmallVector<SDValue, 16> ResultMask;
for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i) {
unsigned SrcElt = PermMask[i] < 0 ? 0 : PermMask[i];
for (unsigned j = 0; j != BytesPerElement; ++j)
ResultMask.push_back(DAG.getConstant(SrcElt*BytesPerElement+j,
MVT::i32));
}
SDValue VPermMask = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v16i8,
&ResultMask[0], ResultMask.size());
return DAG.getNode(PPCISD::VPERM, dl, V1.getValueType(), V1, V2, VPermMask);
}
/// getAltivecCompareInfo - Given an intrinsic, return false if it is not an
/// altivec comparison. If it is, return true and fill in Opc/isDot with
/// information about the intrinsic.
static bool getAltivecCompareInfo(SDValue Intrin, int &CompareOpc,
bool &isDot) {
unsigned IntrinsicID =
cast<ConstantSDNode>(Intrin.getOperand(0))->getZExtValue();
CompareOpc = -1;
isDot = false;
switch (IntrinsicID) {
default: return false;
// Comparison predicates.
case Intrinsic::ppc_altivec_vcmpbfp_p: CompareOpc = 966; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpeqfp_p: CompareOpc = 198; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpequb_p: CompareOpc = 6; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpequh_p: CompareOpc = 70; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpequw_p: CompareOpc = 134; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgefp_p: CompareOpc = 454; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtfp_p: CompareOpc = 710; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtsb_p: CompareOpc = 774; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtsh_p: CompareOpc = 838; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtsw_p: CompareOpc = 902; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtub_p: CompareOpc = 518; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtuh_p: CompareOpc = 582; isDot = 1; break;
case Intrinsic::ppc_altivec_vcmpgtuw_p: CompareOpc = 646; isDot = 1; break;
// Normal Comparisons.
case Intrinsic::ppc_altivec_vcmpbfp: CompareOpc = 966; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpeqfp: CompareOpc = 198; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpequb: CompareOpc = 6; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpequh: CompareOpc = 70; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpequw: CompareOpc = 134; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgefp: CompareOpc = 454; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtfp: CompareOpc = 710; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtsb: CompareOpc = 774; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtsh: CompareOpc = 838; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtsw: CompareOpc = 902; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtub: CompareOpc = 518; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtuh: CompareOpc = 582; isDot = 0; break;
case Intrinsic::ppc_altivec_vcmpgtuw: CompareOpc = 646; isDot = 0; break;
}
return true;
}
/// LowerINTRINSIC_WO_CHAIN - If this is an intrinsic that we want to custom
/// lower, do it, otherwise return null.
SDValue PPCTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op,
SelectionDAG &DAG) const {
// If this is a lowered altivec predicate compare, CompareOpc is set to the
// opcode number of the comparison.
SDLoc dl(Op);
int CompareOpc;
bool isDot;
if (!getAltivecCompareInfo(Op, CompareOpc, isDot))
return SDValue(); // Don't custom lower most intrinsics.
// If this is a non-dot comparison, make the VCMP node and we are done.
if (!isDot) {
SDValue Tmp = DAG.getNode(PPCISD::VCMP, dl, Op.getOperand(2).getValueType(),
Op.getOperand(1), Op.getOperand(2),
DAG.getConstant(CompareOpc, MVT::i32));
return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Tmp);
}
// Create the PPCISD altivec 'dot' comparison node.
SDValue Ops[] = {
Op.getOperand(2), // LHS
Op.getOperand(3), // RHS
DAG.getConstant(CompareOpc, MVT::i32)
};
EVT VTs[] = { Op.getOperand(2).getValueType(), MVT::Glue };
SDValue CompNode = DAG.getNode(PPCISD::VCMPo, dl, VTs, Ops, 3);
// Now that we have the comparison, emit a copy from the CR to a GPR.
// This is flagged to the above dot comparison.
SDValue Flags = DAG.getNode(PPCISD::MFOCRF, dl, MVT::i32,
DAG.getRegister(PPC::CR6, MVT::i32),
CompNode.getValue(1));
// Unpack the result based on how the target uses it.
unsigned BitNo; // Bit # of CR6.
bool InvertBit; // Invert result?
switch (cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue()) {
default: // Can't happen, don't crash on invalid number though.
case 0: // Return the value of the EQ bit of CR6.
BitNo = 0; InvertBit = false;
break;
case 1: // Return the inverted value of the EQ bit of CR6.
BitNo = 0; InvertBit = true;
break;
case 2: // Return the value of the LT bit of CR6.
BitNo = 2; InvertBit = false;
break;
case 3: // Return the inverted value of the LT bit of CR6.
BitNo = 2; InvertBit = true;
break;
}
// Shift the bit into the low position.
Flags = DAG.getNode(ISD::SRL, dl, MVT::i32, Flags,
DAG.getConstant(8-(3-BitNo), MVT::i32));
// Isolate the bit.
Flags = DAG.getNode(ISD::AND, dl, MVT::i32, Flags,
DAG.getConstant(1, MVT::i32));
// If we are supposed to, toggle the bit.
if (InvertBit)
Flags = DAG.getNode(ISD::XOR, dl, MVT::i32, Flags,
DAG.getConstant(1, MVT::i32));
return Flags;
}
SDValue PPCTargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op,
SelectionDAG &DAG) const {
SDLoc dl(Op);
// Create a stack slot that is 16-byte aligned.
MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
int FrameIdx = FrameInfo->CreateStackObject(16, 16, false);
EVT PtrVT = getPointerTy();
SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
// Store the input value into Value#0 of the stack slot.
SDValue Store = DAG.getStore(DAG.getEntryNode(), dl,
Op.getOperand(0), FIdx, MachinePointerInfo(),
false, false, 0);
// Load it out.
return DAG.getLoad(Op.getValueType(), dl, Store, FIdx, MachinePointerInfo(),
false, false, false, 0);
}
SDValue PPCTargetLowering::LowerMUL(SDValue Op, SelectionDAG &DAG) const {
SDLoc dl(Op);
if (Op.getValueType() == MVT::v4i32) {
SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
SDValue Zero = BuildSplatI( 0, 1, MVT::v4i32, DAG, dl);
SDValue Neg16 = BuildSplatI(-16, 4, MVT::v4i32, DAG, dl);//+16 as shift amt.
SDValue RHSSwap = // = vrlw RHS, 16
BuildIntrinsicOp(Intrinsic::ppc_altivec_vrlw, RHS, Neg16, DAG, dl);
// Shrinkify inputs to v8i16.
LHS = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, LHS);
RHS = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, RHS);
RHSSwap = DAG.getNode(ISD::BITCAST, dl, MVT::v8i16, RHSSwap);
// Low parts multiplied together, generating 32-bit results (we ignore the
// top parts).
SDValue LoProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmulouh,
LHS, RHS, DAG, dl, MVT::v4i32);
SDValue HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmsumuhm,
LHS, RHSSwap, Zero, DAG, dl, MVT::v4i32);
// Shift the high parts up 16 bits.
HiProd = BuildIntrinsicOp(Intrinsic::ppc_altivec_vslw, HiProd,
Neg16, DAG, dl);
return DAG.getNode(ISD::ADD, dl, MVT::v4i32, LoProd, HiProd);
} else if (Op.getValueType() == MVT::v8i16) {
SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
SDValue Zero = BuildSplatI(0, 1, MVT::v8i16, DAG, dl);
return BuildIntrinsicOp(Intrinsic::ppc_altivec_vmladduhm,
LHS, RHS, Zero, DAG, dl);
} else if (Op.getValueType() == MVT::v16i8) {
SDValue LHS = Op.getOperand(0), RHS = Op.getOperand(1);
// Multiply the even 8-bit parts, producing 16-bit sums.
SDValue EvenParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuleub,
LHS, RHS, DAG, dl, MVT::v8i16);
EvenParts = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, EvenParts);
// Multiply the odd 8-bit parts, producing 16-bit sums.
SDValue OddParts = BuildIntrinsicOp(Intrinsic::ppc_altivec_vmuloub,
LHS, RHS, DAG, dl, MVT::v8i16);
OddParts = DAG.getNode(ISD::BITCAST, dl, MVT::v16i8, OddParts);
// Merge the results together.
int Ops[16];
for (unsigned i = 0; i != 8; ++i) {
Ops[i*2 ] = 2*i+1;
Ops[i*2+1] = 2*i+1+16;
}
return DAG.getVectorShuffle(MVT::v16i8, dl, EvenParts, OddParts, Ops);
} else {
llvm_unreachable("Unknown mul to lower!");
}
}
/// LowerOperation - Provide custom lowering hooks for some operations.
///
SDValue PPCTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
switch (Op.getOpcode()) {
default: llvm_unreachable("Wasn't expecting to be able to lower this!");
case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
case ISD::JumpTable: return LowerJumpTable(Op, DAG);
case ISD::SETCC: return LowerSETCC(Op, DAG);
case ISD::INIT_TRAMPOLINE: return LowerINIT_TRAMPOLINE(Op, DAG);
case ISD::ADJUST_TRAMPOLINE: return LowerADJUST_TRAMPOLINE(Op, DAG);
case ISD::VASTART:
return LowerVASTART(Op, DAG, PPCSubTarget);
case ISD::VAARG:
return LowerVAARG(Op, DAG, PPCSubTarget);
case ISD::STACKRESTORE: return LowerSTACKRESTORE(Op, DAG, PPCSubTarget);
case ISD::DYNAMIC_STACKALLOC:
return LowerDYNAMIC_STACKALLOC(Op, DAG, PPCSubTarget);
case ISD::EH_SJLJ_SETJMP: return lowerEH_SJLJ_SETJMP(Op, DAG);
case ISD::EH_SJLJ_LONGJMP: return lowerEH_SJLJ_LONGJMP(Op, DAG);
case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
case ISD::FP_TO_UINT:
case ISD::FP_TO_SINT: return LowerFP_TO_INT(Op, DAG,
SDLoc(Op));
case ISD::UINT_TO_FP:
case ISD::SINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
case ISD::FLT_ROUNDS_: return LowerFLT_ROUNDS_(Op, DAG);
// Lower 64-bit shifts.
case ISD::SHL_PARTS: return LowerSHL_PARTS(Op, DAG);
case ISD::SRL_PARTS: return LowerSRL_PARTS(Op, DAG);
case ISD::SRA_PARTS: return LowerSRA_PARTS(Op, DAG);
// Vector-related lowering.
case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
case ISD::SCALAR_TO_VECTOR: return LowerSCALAR_TO_VECTOR(Op, DAG);
case ISD::MUL: return LowerMUL(Op, DAG);
// For counter-based loop handling.
case ISD::INTRINSIC_W_CHAIN: return SDValue();
// Frame & Return address.
case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
}
}
void PPCTargetLowering::ReplaceNodeResults(SDNode *N,
SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG) const {
const TargetMachine &TM = getTargetMachine();
SDLoc dl(N);
switch (N->getOpcode()) {
default:
llvm_unreachable("Do not know how to custom type legalize this operation!");
case ISD::INTRINSIC_W_CHAIN: {
if (cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() !=
Intrinsic::ppc_is_decremented_ctr_nonzero)
break;
assert(N->getValueType(0) == MVT::i1 &&
"Unexpected result type for CTR decrement intrinsic");
EVT SVT = getSetCCResultType(*DAG.getContext(), N->getValueType(0));
SDVTList VTs = DAG.getVTList(SVT, MVT::Other);
SDValue NewInt = DAG.getNode(N->getOpcode(), dl, VTs, N->getOperand(0),
N->getOperand(1));
Results.push_back(NewInt);
Results.push_back(NewInt.getValue(1));
break;
}
case ISD::VAARG: {
if (!TM.getSubtarget<PPCSubtarget>().isSVR4ABI()
|| TM.getSubtarget<PPCSubtarget>().isPPC64())
return;
EVT VT = N->getValueType(0);
if (VT == MVT::i64) {
SDValue NewNode = LowerVAARG(SDValue(N, 1), DAG, PPCSubTarget);
Results.push_back(NewNode);
Results.push_back(NewNode.getValue(1));
}
return;
}
case ISD::FP_ROUND_INREG: {
assert(N->getValueType(0) == MVT::ppcf128);
assert(N->getOperand(0).getValueType() == MVT::ppcf128);
SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl,
MVT::f64, N->getOperand(0),
DAG.getIntPtrConstant(0));
SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl,
MVT::f64, N->getOperand(0),
DAG.getIntPtrConstant(1));
// Add the two halves of the long double in round-to-zero mode.
SDValue FPreg = DAG.getNode(PPCISD::FADDRTZ, dl, MVT::f64, Lo, Hi);
// We know the low half is about to be thrown away, so just use something
// convenient.
Results.push_back(DAG.getNode(ISD::BUILD_PAIR, dl, MVT::ppcf128,
FPreg, FPreg));
return;
}
case ISD::FP_TO_SINT:
Results.push_back(LowerFP_TO_INT(SDValue(N, 0), DAG, dl));
return;
}
}
//===----------------------------------------------------------------------===//
// Other Lowering Code
//===----------------------------------------------------------------------===//
MachineBasicBlock *
PPCTargetLowering::EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
bool is64bit, unsigned BinOpcode) const {
// This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineFunction *F = BB->getParent();
MachineFunction::iterator It = BB;
++It;
unsigned dest = MI->getOperand(0).getReg();
unsigned ptrA = MI->getOperand(1).getReg();
unsigned ptrB = MI->getOperand(2).getReg();
unsigned incr = MI->getOperand(3).getReg();
DebugLoc dl = MI->getDebugLoc();
MachineBasicBlock *loopMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(It, loopMBB);
F->insert(It, exitMBB);
exitMBB->splice(exitMBB->begin(), BB,
llvm::next(MachineBasicBlock::iterator(MI)),
BB->end());
exitMBB->transferSuccessorsAndUpdatePHIs(BB);
MachineRegisterInfo &RegInfo = F->getRegInfo();
unsigned TmpReg = (!BinOpcode) ? incr :
RegInfo.createVirtualRegister(
is64bit ? (const TargetRegisterClass *) &PPC::G8RCRegClass :
(const TargetRegisterClass *) &PPC::GPRCRegClass);
// thisMBB:
// ...
// fallthrough --> loopMBB
BB->addSuccessor(loopMBB);
// loopMBB:
// l[wd]arx dest, ptr
// add r0, dest, incr
// st[wd]cx. r0, ptr
// bne- loopMBB
// fallthrough --> exitMBB
BB = loopMBB;
BuildMI(BB, dl, TII->get(is64bit ? PPC::LDARX : PPC::LWARX), dest)
.addReg(ptrA).addReg(ptrB);
if (BinOpcode)
BuildMI(BB, dl, TII->get(BinOpcode), TmpReg).addReg(incr).addReg(dest);
BuildMI(BB, dl, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
.addReg(TmpReg).addReg(ptrA).addReg(ptrB);
BuildMI(BB, dl, TII->get(PPC::BCC))
.addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loopMBB);
BB->addSuccessor(loopMBB);
BB->addSuccessor(exitMBB);
// exitMBB:
// ...
BB = exitMBB;
return BB;
}
MachineBasicBlock *
PPCTargetLowering::EmitPartwordAtomicBinary(MachineInstr *MI,
MachineBasicBlock *BB,
bool is8bit, // operation
unsigned BinOpcode) const {
// This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
// In 64 bit mode we have to use 64 bits for addresses, even though the
// lwarx/stwcx are 32 bits. With the 32-bit atomics we can use address
// registers without caring whether they're 32 or 64, but here we're
// doing actual arithmetic on the addresses.
bool is64bit = PPCSubTarget.isPPC64();
unsigned ZeroReg = is64bit ? PPC::ZERO8 : PPC::ZERO;
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineFunction *F = BB->getParent();
MachineFunction::iterator It = BB;
++It;
unsigned dest = MI->getOperand(0).getReg();
unsigned ptrA = MI->getOperand(1).getReg();
unsigned ptrB = MI->getOperand(2).getReg();
unsigned incr = MI->getOperand(3).getReg();
DebugLoc dl = MI->getDebugLoc();
MachineBasicBlock *loopMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(It, loopMBB);
F->insert(It, exitMBB);
exitMBB->splice(exitMBB->begin(), BB,
llvm::next(MachineBasicBlock::iterator(MI)),
BB->end());
exitMBB->transferSuccessorsAndUpdatePHIs(BB);
MachineRegisterInfo &RegInfo = F->getRegInfo();
const TargetRegisterClass *RC =
is64bit ? (const TargetRegisterClass *) &PPC::G8RCRegClass :
(const TargetRegisterClass *) &PPC::GPRCRegClass;
unsigned PtrReg = RegInfo.createVirtualRegister(RC);
unsigned Shift1Reg = RegInfo.createVirtualRegister(RC);
unsigned ShiftReg = RegInfo.createVirtualRegister(RC);
unsigned Incr2Reg = RegInfo.createVirtualRegister(RC);
unsigned MaskReg = RegInfo.createVirtualRegister(RC);
unsigned Mask2Reg = RegInfo.createVirtualRegister(RC);
unsigned Mask3Reg = RegInfo.createVirtualRegister(RC);
unsigned Tmp2Reg = RegInfo.createVirtualRegister(RC);
unsigned Tmp3Reg = RegInfo.createVirtualRegister(RC);
unsigned Tmp4Reg = RegInfo.createVirtualRegister(RC);
unsigned TmpDestReg = RegInfo.createVirtualRegister(RC);
unsigned Ptr1Reg;
unsigned TmpReg = (!BinOpcode) ? Incr2Reg : RegInfo.createVirtualRegister(RC);
// thisMBB:
// ...
// fallthrough --> loopMBB
BB->addSuccessor(loopMBB);
// The 4-byte load must be aligned, while a char or short may be
// anywhere in the word. Hence all this nasty bookkeeping code.
// add ptr1, ptrA, ptrB [copy if ptrA==0]
// rlwinm shift1, ptr1, 3, 27, 28 [3, 27, 27]
// xori shift, shift1, 24 [16]
// rlwinm ptr, ptr1, 0, 0, 29
// slw incr2, incr, shift
// li mask2, 255 [li mask3, 0; ori mask2, mask3, 65535]
// slw mask, mask2, shift
// loopMBB:
// lwarx tmpDest, ptr
// add tmp, tmpDest, incr2
// andc tmp2, tmpDest, mask
// and tmp3, tmp, mask
// or tmp4, tmp3, tmp2
// stwcx. tmp4, ptr
// bne- loopMBB
// fallthrough --> exitMBB
// srw dest, tmpDest, shift
if (ptrA != ZeroReg) {
Ptr1Reg = RegInfo.createVirtualRegister(RC);
BuildMI(BB, dl, TII->get(is64bit ? PPC::ADD8 : PPC::ADD4), Ptr1Reg)
.addReg(ptrA).addReg(ptrB);
} else {
Ptr1Reg = ptrB;
}
BuildMI(BB, dl, TII->get(PPC::RLWINM), Shift1Reg).addReg(Ptr1Reg)
.addImm(3).addImm(27).addImm(is8bit ? 28 : 27);
BuildMI(BB, dl, TII->get(is64bit ? PPC::XORI8 : PPC::XORI), ShiftReg)
.addReg(Shift1Reg).addImm(is8bit ? 24 : 16);
if (is64bit)
BuildMI(BB, dl, TII->get(PPC::RLDICR), PtrReg)
.addReg(Ptr1Reg).addImm(0).addImm(61);
else
BuildMI(BB, dl, TII->get(PPC::RLWINM), PtrReg)
.addReg(Ptr1Reg).addImm(0).addImm(0).addImm(29);
BuildMI(BB, dl, TII->get(PPC::SLW), Incr2Reg)
.addReg(incr).addReg(ShiftReg);
if (is8bit)
BuildMI(BB, dl, TII->get(PPC::LI), Mask2Reg).addImm(255);
else {
BuildMI(BB, dl, TII->get(PPC::LI), Mask3Reg).addImm(0);
BuildMI(BB, dl, TII->get(PPC::ORI),Mask2Reg).addReg(Mask3Reg).addImm(65535);
}
BuildMI(BB, dl, TII->get(PPC::SLW), MaskReg)
.addReg(Mask2Reg).addReg(ShiftReg);
BB = loopMBB;
BuildMI(BB, dl, TII->get(PPC::LWARX), TmpDestReg)
.addReg(ZeroReg).addReg(PtrReg);
if (BinOpcode)
BuildMI(BB, dl, TII->get(BinOpcode), TmpReg)
.addReg(Incr2Reg).addReg(TmpDestReg);
BuildMI(BB, dl, TII->get(is64bit ? PPC::ANDC8 : PPC::ANDC), Tmp2Reg)
.addReg(TmpDestReg).addReg(MaskReg);
BuildMI(BB, dl, TII->get(is64bit ? PPC::AND8 : PPC::AND), Tmp3Reg)
.addReg(TmpReg).addReg(MaskReg);
BuildMI(BB, dl, TII->get(is64bit ? PPC::OR8 : PPC::OR), Tmp4Reg)
.addReg(Tmp3Reg).addReg(Tmp2Reg);
BuildMI(BB, dl, TII->get(PPC::STWCX))
.addReg(Tmp4Reg).addReg(ZeroReg).addReg(PtrReg);
BuildMI(BB, dl, TII->get(PPC::BCC))
.addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loopMBB);
BB->addSuccessor(loopMBB);
BB->addSuccessor(exitMBB);
// exitMBB:
// ...
BB = exitMBB;
BuildMI(*BB, BB->begin(), dl, TII->get(PPC::SRW), dest).addReg(TmpDestReg)
.addReg(ShiftReg);
return BB;
}
llvm::MachineBasicBlock*
PPCTargetLowering::emitEHSjLjSetJmp(MachineInstr *MI,
MachineBasicBlock *MBB) const {
DebugLoc DL = MI->getDebugLoc();
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
MachineFunction *MF = MBB->getParent();
MachineRegisterInfo &MRI = MF->getRegInfo();
const BasicBlock *BB = MBB->getBasicBlock();
MachineFunction::iterator I = MBB;
++I;
// Memory Reference
MachineInstr::mmo_iterator MMOBegin = MI->memoperands_begin();
MachineInstr::mmo_iterator MMOEnd = MI->memoperands_end();
unsigned DstReg = MI->getOperand(0).getReg();
const TargetRegisterClass *RC = MRI.getRegClass(DstReg);
assert(RC->hasType(MVT::i32) && "Invalid destination!");
unsigned mainDstReg = MRI.createVirtualRegister(RC);
unsigned restoreDstReg = MRI.createVirtualRegister(RC);
MVT PVT = getPointerTy();
assert((PVT == MVT::i64 || PVT == MVT::i32) &&
"Invalid Pointer Size!");
// For v = setjmp(buf), we generate
//
// thisMBB:
// SjLjSetup mainMBB
// bl mainMBB
// v_restore = 1
// b sinkMBB
//
// mainMBB:
// buf[LabelOffset] = LR
// v_main = 0
//
// sinkMBB:
// v = phi(main, restore)
//
MachineBasicBlock *thisMBB = MBB;
MachineBasicBlock *mainMBB = MF->CreateMachineBasicBlock(BB);
MachineBasicBlock *sinkMBB = MF->CreateMachineBasicBlock(BB);
MF->insert(I, mainMBB);
MF->insert(I, sinkMBB);
MachineInstrBuilder MIB;
// Transfer the remainder of BB and its successor edges to sinkMBB.
sinkMBB->splice(sinkMBB->begin(), MBB,
llvm::next(MachineBasicBlock::iterator(MI)), MBB->end());
sinkMBB->transferSuccessorsAndUpdatePHIs(MBB);
// Note that the structure of the jmp_buf used here is not compatible
// with that used by libc, and is not designed to be. Specifically, it
// stores only those 'reserved' registers that LLVM does not otherwise
// understand how to spill. Also, by convention, by the time this
// intrinsic is called, Clang has already stored the frame address in the
// first slot of the buffer and stack address in the third. Following the
// X86 target code, we'll store the jump address in the second slot. We also
// need to save the TOC pointer (R2) to handle jumps between shared
// libraries, and that will be stored in the fourth slot. The thread
// identifier (R13) is not affected.
// thisMBB:
const int64_t LabelOffset = 1 * PVT.getStoreSize();
const int64_t TOCOffset = 3 * PVT.getStoreSize();
// Prepare IP either in reg.
const TargetRegisterClass *PtrRC = getRegClassFor(PVT);
unsigned LabelReg = MRI.createVirtualRegister(PtrRC);
unsigned BufReg = MI->getOperand(1).getReg();
if (PPCSubTarget.isPPC64() && PPCSubTarget.isSVR4ABI()) {
MIB = BuildMI(*thisMBB, MI, DL, TII->get(PPC::STD))
.addReg(PPC::X2)
.addImm(TOCOffset)
.addReg(BufReg);
MIB.setMemRefs(MMOBegin, MMOEnd);
}
// Setup
MIB = BuildMI(*thisMBB, MI, DL, TII->get(PPC::BCLalways)).addMBB(mainMBB);
const PPCRegisterInfo *TRI =
static_cast<const PPCRegisterInfo*>(getTargetMachine().getRegisterInfo());
MIB.addRegMask(TRI->getNoPreservedMask());
BuildMI(*thisMBB, MI, DL, TII->get(PPC::LI), restoreDstReg).addImm(1);
MIB = BuildMI(*thisMBB, MI, DL, TII->get(PPC::EH_SjLj_Setup))
.addMBB(mainMBB);
MIB = BuildMI(*thisMBB, MI, DL, TII->get(PPC::B)).addMBB(sinkMBB);
thisMBB->addSuccessor(mainMBB, /* weight */ 0);
thisMBB->addSuccessor(sinkMBB, /* weight */ 1);
// mainMBB:
// mainDstReg = 0
MIB = BuildMI(mainMBB, DL,
TII->get(PPCSubTarget.isPPC64() ? PPC::MFLR8 : PPC::MFLR), LabelReg);
// Store IP
if (PPCSubTarget.isPPC64()) {
MIB = BuildMI(mainMBB, DL, TII->get(PPC::STD))
.addReg(LabelReg)
.addImm(LabelOffset)
.addReg(BufReg);
} else {
MIB = BuildMI(mainMBB, DL, TII->get(PPC::STW))
.addReg(LabelReg)
.addImm(LabelOffset)
.addReg(BufReg);
}
MIB.setMemRefs(MMOBegin, MMOEnd);
BuildMI(mainMBB, DL, TII->get(PPC::LI), mainDstReg).addImm(0);
mainMBB->addSuccessor(sinkMBB);
// sinkMBB:
BuildMI(*sinkMBB, sinkMBB->begin(), DL,
TII->get(PPC::PHI), DstReg)
.addReg(mainDstReg).addMBB(mainMBB)
.addReg(restoreDstReg).addMBB(thisMBB);
MI->eraseFromParent();
return sinkMBB;
}
MachineBasicBlock *
PPCTargetLowering::emitEHSjLjLongJmp(MachineInstr *MI,
MachineBasicBlock *MBB) const {
DebugLoc DL = MI->getDebugLoc();
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
MachineFunction *MF = MBB->getParent();
MachineRegisterInfo &MRI = MF->getRegInfo();
// Memory Reference
MachineInstr::mmo_iterator MMOBegin = MI->memoperands_begin();
MachineInstr::mmo_iterator MMOEnd = MI->memoperands_end();
MVT PVT = getPointerTy();
assert((PVT == MVT::i64 || PVT == MVT::i32) &&
"Invalid Pointer Size!");
const TargetRegisterClass *RC =
(PVT == MVT::i64) ? &PPC::G8RCRegClass : &PPC::GPRCRegClass;
unsigned Tmp = MRI.createVirtualRegister(RC);
// Since FP is only updated here but NOT referenced, it's treated as GPR.
unsigned FP = (PVT == MVT::i64) ? PPC::X31 : PPC::R31;
unsigned SP = (PVT == MVT::i64) ? PPC::X1 : PPC::R1;
MachineInstrBuilder MIB;
const int64_t LabelOffset = 1 * PVT.getStoreSize();
const int64_t SPOffset = 2 * PVT.getStoreSize();
const int64_t TOCOffset = 3 * PVT.getStoreSize();
unsigned BufReg = MI->getOperand(0).getReg();
// Reload FP (the jumped-to function may not have had a
// frame pointer, and if so, then its r31 will be restored
// as necessary).
if (PVT == MVT::i64) {
MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LD), FP)
.addImm(0)
.addReg(BufReg);
} else {
MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LWZ), FP)
.addImm(0)
.addReg(BufReg);
}
MIB.setMemRefs(MMOBegin, MMOEnd);
// Reload IP
if (PVT == MVT::i64) {
MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LD), Tmp)
.addImm(LabelOffset)
.addReg(BufReg);
} else {
MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LWZ), Tmp)
.addImm(LabelOffset)
.addReg(BufReg);
}
MIB.setMemRefs(MMOBegin, MMOEnd);
// Reload SP
if (PVT == MVT::i64) {
MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LD), SP)
.addImm(SPOffset)
.addReg(BufReg);
} else {
MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LWZ), SP)
.addImm(SPOffset)
.addReg(BufReg);
}
MIB.setMemRefs(MMOBegin, MMOEnd);
// FIXME: When we also support base pointers, that register must also be
// restored here.
// Reload TOC
if (PVT == MVT::i64 && PPCSubTarget.isSVR4ABI()) {
MIB = BuildMI(*MBB, MI, DL, TII->get(PPC::LD), PPC::X2)
.addImm(TOCOffset)
.addReg(BufReg);
MIB.setMemRefs(MMOBegin, MMOEnd);
}
// Jump
BuildMI(*MBB, MI, DL,
TII->get(PVT == MVT::i64 ? PPC::MTCTR8 : PPC::MTCTR)).addReg(Tmp);
BuildMI(*MBB, MI, DL, TII->get(PVT == MVT::i64 ? PPC::BCTR8 : PPC::BCTR));
MI->eraseFromParent();
return MBB;
}
MachineBasicBlock *
PPCTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) const {
if (MI->getOpcode() == PPC::EH_SjLj_SetJmp32 ||
MI->getOpcode() == PPC::EH_SjLj_SetJmp64) {
return emitEHSjLjSetJmp(MI, BB);
} else if (MI->getOpcode() == PPC::EH_SjLj_LongJmp32 ||
MI->getOpcode() == PPC::EH_SjLj_LongJmp64) {
return emitEHSjLjLongJmp(MI, BB);
}
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
// To "insert" these instructions we actually have to insert their
// control-flow patterns.
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineFunction::iterator It = BB;
++It;
MachineFunction *F = BB->getParent();
if (PPCSubTarget.hasISEL() && (MI->getOpcode() == PPC::SELECT_CC_I4 ||
MI->getOpcode() == PPC::SELECT_CC_I8)) {
SmallVector<MachineOperand, 2> Cond;
Cond.push_back(MI->getOperand(4));
Cond.push_back(MI->getOperand(1));
DebugLoc dl = MI->getDebugLoc();
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
TII->insertSelect(*BB, MI, dl, MI->getOperand(0).getReg(),
Cond, MI->getOperand(2).getReg(),
MI->getOperand(3).getReg());
} else if (MI->getOpcode() == PPC::SELECT_CC_I4 ||
MI->getOpcode() == PPC::SELECT_CC_I8 ||
MI->getOpcode() == PPC::SELECT_CC_F4 ||
MI->getOpcode() == PPC::SELECT_CC_F8 ||
MI->getOpcode() == PPC::SELECT_CC_VRRC) {
// The incoming instruction knows the destination vreg to set, the
// condition code register to branch on, the true/false values to
// select between, and a branch opcode to use.
// thisMBB:
// ...
// TrueVal = ...
// cmpTY ccX, r1, r2
// bCC copy1MBB
// fallthrough --> copy0MBB
MachineBasicBlock *thisMBB = BB;
MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
unsigned SelectPred = MI->getOperand(4).getImm();
DebugLoc dl = MI->getDebugLoc();
F->insert(It, copy0MBB);
F->insert(It, sinkMBB);
// Transfer the remainder of BB and its successor edges to sinkMBB.
sinkMBB->splice(sinkMBB->begin(), BB,
llvm::next(MachineBasicBlock::iterator(MI)),
BB->end());
sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
// Next, add the true and fallthrough blocks as its successors.
BB->addSuccessor(copy0MBB);
BB->addSuccessor(sinkMBB);
BuildMI(BB, dl, TII->get(PPC::BCC))
.addImm(SelectPred).addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB);
// copy0MBB:
// %FalseValue = ...
// # fallthrough to sinkMBB
BB = copy0MBB;
// Update machine-CFG edges
BB->addSuccessor(sinkMBB);
// sinkMBB:
// %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
// ...
BB = sinkMBB;
BuildMI(*BB, BB->begin(), dl,
TII->get(PPC::PHI), MI->getOperand(0).getReg())
.addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB)
.addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
}
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I8)
BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::ADD4);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I16)
BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::ADD4);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I32)
BB = EmitAtomicBinary(MI, BB, false, PPC::ADD4);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_ADD_I64)
BB = EmitAtomicBinary(MI, BB, true, PPC::ADD8);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I8)
BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::AND);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I16)
BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::AND);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I32)
BB = EmitAtomicBinary(MI, BB, false, PPC::AND);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_AND_I64)
BB = EmitAtomicBinary(MI, BB, true, PPC::AND8);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I8)
BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::OR);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I16)
BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::OR);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I32)
BB = EmitAtomicBinary(MI, BB, false, PPC::OR);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_OR_I64)
BB = EmitAtomicBinary(MI, BB, true, PPC::OR8);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I8)
BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::XOR);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I16)
BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::XOR);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I32)
BB = EmitAtomicBinary(MI, BB, false, PPC::XOR);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_XOR_I64)
BB = EmitAtomicBinary(MI, BB, true, PPC::XOR8);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I8)
BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::ANDC);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I16)
BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::ANDC);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I32)
BB = EmitAtomicBinary(MI, BB, false, PPC::ANDC);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_NAND_I64)
BB = EmitAtomicBinary(MI, BB, true, PPC::ANDC8);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I8)
BB = EmitPartwordAtomicBinary(MI, BB, true, PPC::SUBF);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I16)
BB = EmitPartwordAtomicBinary(MI, BB, false, PPC::SUBF);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I32)
BB = EmitAtomicBinary(MI, BB, false, PPC::SUBF);
else if (MI->getOpcode() == PPC::ATOMIC_LOAD_SUB_I64)
BB = EmitAtomicBinary(MI, BB, true, PPC::SUBF8);
else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I8)
BB = EmitPartwordAtomicBinary(MI, BB, true, 0);
else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I16)
BB = EmitPartwordAtomicBinary(MI, BB, false, 0);
else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I32)
BB = EmitAtomicBinary(MI, BB, false, 0);
else if (MI->getOpcode() == PPC::ATOMIC_SWAP_I64)
BB = EmitAtomicBinary(MI, BB, true, 0);
else if (MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I32 ||
MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I64) {
bool is64bit = MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I64;
unsigned dest = MI->getOperand(0).getReg();
unsigned ptrA = MI->getOperand(1).getReg();
unsigned ptrB = MI->getOperand(2).getReg();
unsigned oldval = MI->getOperand(3).getReg();
unsigned newval = MI->getOperand(4).getReg();
DebugLoc dl = MI->getDebugLoc();
MachineBasicBlock *loop1MBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *loop2MBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(It, loop1MBB);
F->insert(It, loop2MBB);
F->insert(It, midMBB);
F->insert(It, exitMBB);
exitMBB->splice(exitMBB->begin(), BB,
llvm::next(MachineBasicBlock::iterator(MI)),
BB->end());
exitMBB->transferSuccessorsAndUpdatePHIs(BB);
// thisMBB:
// ...
// fallthrough --> loopMBB
BB->addSuccessor(loop1MBB);
// loop1MBB:
// l[wd]arx dest, ptr
// cmp[wd] dest, oldval
// bne- midMBB
// loop2MBB:
// st[wd]cx. newval, ptr
// bne- loopMBB
// b exitBB
// midMBB:
// st[wd]cx. dest, ptr
// exitBB:
BB = loop1MBB;
BuildMI(BB, dl, TII->get(is64bit ? PPC::LDARX : PPC::LWARX), dest)
.addReg(ptrA).addReg(ptrB);
BuildMI(BB, dl, TII->get(is64bit ? PPC::CMPD : PPC::CMPW), PPC::CR0)
.addReg(oldval).addReg(dest);
BuildMI(BB, dl, TII->get(PPC::BCC))
.addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(midMBB);
BB->addSuccessor(loop2MBB);
BB->addSuccessor(midMBB);
BB = loop2MBB;
BuildMI(BB, dl, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
.addReg(newval).addReg(ptrA).addReg(ptrB);
BuildMI(BB, dl, TII->get(PPC::BCC))
.addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loop1MBB);
BuildMI(BB, dl, TII->get(PPC::B)).addMBB(exitMBB);
BB->addSuccessor(loop1MBB);
BB->addSuccessor(exitMBB);
BB = midMBB;
BuildMI(BB, dl, TII->get(is64bit ? PPC::STDCX : PPC::STWCX))
.addReg(dest).addReg(ptrA).addReg(ptrB);
BB->addSuccessor(exitMBB);
// exitMBB:
// ...
BB = exitMBB;
} else if (MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I8 ||
MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I16) {
// We must use 64-bit registers for addresses when targeting 64-bit,
// since we're actually doing arithmetic on them. Other registers
// can be 32-bit.
bool is64bit = PPCSubTarget.isPPC64();
bool is8bit = MI->getOpcode() == PPC::ATOMIC_CMP_SWAP_I8;
unsigned dest = MI->getOperand(0).getReg();
unsigned ptrA = MI->getOperand(1).getReg();
unsigned ptrB = MI->getOperand(2).getReg();
unsigned oldval = MI->getOperand(3).getReg();
unsigned newval = MI->getOperand(4).getReg();
DebugLoc dl = MI->getDebugLoc();
MachineBasicBlock *loop1MBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *loop2MBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(It, loop1MBB);
F->insert(It, loop2MBB);
F->insert(It, midMBB);
F->insert(It, exitMBB);
exitMBB->splice(exitMBB->begin(), BB,
llvm::next(MachineBasicBlock::iterator(MI)),
BB->end());
exitMBB->transferSuccessorsAndUpdatePHIs(BB);
MachineRegisterInfo &RegInfo = F->getRegInfo();
const TargetRegisterClass *RC =
is64bit ? (const TargetRegisterClass *) &PPC::G8RCRegClass :
(const TargetRegisterClass *) &PPC::GPRCRegClass;
unsigned PtrReg = RegInfo.createVirtualRegister(RC);
unsigned Shift1Reg = RegInfo.createVirtualRegister(RC);
unsigned ShiftReg = RegInfo.createVirtualRegister(RC);
unsigned NewVal2Reg = RegInfo.createVirtualRegister(RC);
unsigned NewVal3Reg = RegInfo.createVirtualRegister(RC);
unsigned OldVal2Reg = RegInfo.createVirtualRegister(RC);
unsigned OldVal3Reg = RegInfo.createVirtualRegister(RC);
unsigned MaskReg = RegInfo.createVirtualRegister(RC);
unsigned Mask2Reg = RegInfo.createVirtualRegister(RC);
unsigned Mask3Reg = RegInfo.createVirtualRegister(RC);
unsigned Tmp2Reg = RegInfo.createVirtualRegister(RC);
unsigned Tmp4Reg = RegInfo.createVirtualRegister(RC);
unsigned TmpDestReg = RegInfo.createVirtualRegister(RC);
unsigned Ptr1Reg;
unsigned TmpReg = RegInfo.createVirtualRegister(RC);
unsigned ZeroReg = is64bit ? PPC::ZERO8 : PPC::ZERO;
// thisMBB:
// ...
// fallthrough --> loopMBB
BB->addSuccessor(loop1MBB);
// The 4-byte load must be aligned, while a char or short may be
// anywhere in the word. Hence all this nasty bookkeeping code.
// add ptr1, ptrA, ptrB [copy if ptrA==0]
// rlwinm shift1, ptr1, 3, 27, 28 [3, 27, 27]
// xori shift, shift1, 24 [16]
// rlwinm ptr, ptr1, 0, 0, 29
// slw newval2, newval, shift
// slw oldval2, oldval,shift
// li mask2, 255 [li mask3, 0; ori mask2, mask3, 65535]
// slw mask, mask2, shift
// and newval3, newval2, mask
// and oldval3, oldval2, mask
// loop1MBB:
// lwarx tmpDest, ptr
// and tmp, tmpDest, mask
// cmpw tmp, oldval3
// bne- midMBB
// loop2MBB:
// andc tmp2, tmpDest, mask
// or tmp4, tmp2, newval3
// stwcx. tmp4, ptr
// bne- loop1MBB
// b exitBB
// midMBB:
// stwcx. tmpDest, ptr
// exitBB:
// srw dest, tmpDest, shift
if (ptrA != ZeroReg) {
Ptr1Reg = RegInfo.createVirtualRegister(RC);
BuildMI(BB, dl, TII->get(is64bit ? PPC::ADD8 : PPC::ADD4), Ptr1Reg)
.addReg(ptrA).addReg(ptrB);
} else {
Ptr1Reg = ptrB;
}
BuildMI(BB, dl, TII->get(PPC::RLWINM), Shift1Reg).addReg(Ptr1Reg)
.addImm(3).addImm(27).addImm(is8bit ? 28 : 27);
BuildMI(BB, dl, TII->get(is64bit ? PPC::XORI8 : PPC::XORI), ShiftReg)
.addReg(Shift1Reg).addImm(is8bit ? 24 : 16);
if (is64bit)
BuildMI(BB, dl, TII->get(PPC::RLDICR), PtrReg)
.addReg(Ptr1Reg).addImm(0).addImm(61);
else
BuildMI(BB, dl, TII->get(PPC::RLWINM), PtrReg)
.addReg(Ptr1Reg).addImm(0).addImm(0).addImm(29);
BuildMI(BB, dl, TII->get(PPC::SLW), NewVal2Reg)
.addReg(newval).addReg(ShiftReg);
BuildMI(BB, dl, TII->get(PPC::SLW), OldVal2Reg)
.addReg(oldval).addReg(ShiftReg);
if (is8bit)
BuildMI(BB, dl, TII->get(PPC::LI), Mask2Reg).addImm(255);
else {
BuildMI(BB, dl, TII->get(PPC::LI), Mask3Reg).addImm(0);
BuildMI(BB, dl, TII->get(PPC::ORI), Mask2Reg)
.addReg(Mask3Reg).addImm(65535);
}
BuildMI(BB, dl, TII->get(PPC::SLW), MaskReg)
.addReg(Mask2Reg).addReg(ShiftReg);
BuildMI(BB, dl, TII->get(PPC::AND), NewVal3Reg)
.addReg(NewVal2Reg).addReg(MaskReg);
BuildMI(BB, dl, TII->get(PPC::AND), OldVal3Reg)
.addReg(OldVal2Reg).addReg(MaskReg);
BB = loop1MBB;
BuildMI(BB, dl, TII->get(PPC::LWARX), TmpDestReg)
.addReg(ZeroReg).addReg(PtrReg);
BuildMI(BB, dl, TII->get(PPC::AND),TmpReg)
.addReg(TmpDestReg).addReg(MaskReg);
BuildMI(BB, dl, TII->get(PPC::CMPW), PPC::CR0)
.addReg(TmpReg).addReg(OldVal3Reg);
BuildMI(BB, dl, TII->get(PPC::BCC))
.addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(midMBB);
BB->addSuccessor(loop2MBB);
BB->addSuccessor(midMBB);
BB = loop2MBB;
BuildMI(BB, dl, TII->get(PPC::ANDC),Tmp2Reg)
.addReg(TmpDestReg).addReg(MaskReg);
BuildMI(BB, dl, TII->get(PPC::OR),Tmp4Reg)
.addReg(Tmp2Reg).addReg(NewVal3Reg);
BuildMI(BB, dl, TII->get(PPC::STWCX)).addReg(Tmp4Reg)
.addReg(ZeroReg).addReg(PtrReg);
BuildMI(BB, dl, TII->get(PPC::BCC))
.addImm(PPC::PRED_NE).addReg(PPC::CR0).addMBB(loop1MBB);
BuildMI(BB, dl, TII->get(PPC::B)).addMBB(exitMBB);
BB->addSuccessor(loop1MBB);
BB->addSuccessor(exitMBB);
BB = midMBB;
BuildMI(BB, dl, TII->get(PPC::STWCX)).addReg(TmpDestReg)
.addReg(ZeroReg).addReg(PtrReg);
BB->addSuccessor(exitMBB);
// exitMBB:
// ...
BB = exitMBB;
BuildMI(*BB, BB->begin(), dl, TII->get(PPC::SRW),dest).addReg(TmpReg)
.addReg(ShiftReg);
} else if (MI->getOpcode() == PPC::FADDrtz) {
// This pseudo performs an FADD with rounding mode temporarily forced
// to round-to-zero. We emit this via custom inserter since the FPSCR
// is not modeled at the SelectionDAG level.
unsigned Dest = MI->getOperand(0).getReg();
unsigned Src1 = MI->getOperand(1).getReg();
unsigned Src2 = MI->getOperand(2).getReg();
DebugLoc dl = MI->getDebugLoc();
MachineRegisterInfo &RegInfo = F->getRegInfo();
unsigned MFFSReg = RegInfo.createVirtualRegister(&PPC::F8RCRegClass);
// Save FPSCR value.
BuildMI(*BB, MI, dl, TII->get(PPC::MFFS), MFFSReg);
// Set rounding mode to round-to-zero.
BuildMI(*BB, MI, dl, TII->get(PPC::MTFSB1)).addImm(31);
BuildMI(*BB, MI, dl, TII->get(PPC::MTFSB0)).addImm(30);
// Perform addition.
BuildMI(*BB, MI, dl, TII->get(PPC::FADD), Dest).addReg(Src1).addReg(Src2);
// Restore FPSCR value.
BuildMI(*BB, MI, dl, TII->get(PPC::MTFSF)).addImm(1).addReg(MFFSReg);
} else if (MI->getOpcode() == PPC::FRINDrint ||
MI->getOpcode() == PPC::FRINSrint) {
bool isf32 = MI->getOpcode() == PPC::FRINSrint;
unsigned Dest = MI->getOperand(0).getReg();
unsigned Src = MI->getOperand(1).getReg();
DebugLoc dl = MI->getDebugLoc();
MachineRegisterInfo &RegInfo = F->getRegInfo();
unsigned CRReg = RegInfo.createVirtualRegister(&PPC::CRRCRegClass);
// Perform the rounding.
BuildMI(*BB, MI, dl, TII->get(isf32 ? PPC::FRINS : PPC::FRIND), Dest)
.addReg(Src);
// Compare the results.
BuildMI(*BB, MI, dl, TII->get(isf32 ? PPC::FCMPUS : PPC::FCMPUD), CRReg)
.addReg(Dest).addReg(Src);
// If the results were not equal, then set the FPSCR XX bit.
MachineBasicBlock *midMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *exitMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(It, midMBB);
F->insert(It, exitMBB);
exitMBB->splice(exitMBB->begin(), BB,
llvm::next(MachineBasicBlock::iterator(MI)),
BB->end());
exitMBB->transferSuccessorsAndUpdatePHIs(BB);
BuildMI(*BB, MI, dl, TII->get(PPC::BCC))
.addImm(PPC::PRED_EQ).addReg(CRReg).addMBB(exitMBB);
BB->addSuccessor(midMBB);
BB->addSuccessor(exitMBB);
BB = midMBB;
// Set the FPSCR XX bit (FE_INEXACT). Note that we cannot just set
// the FI bit here because that will not automatically set XX also,
// and XX is what libm interprets as the FE_INEXACT flag.
BuildMI(BB, dl, TII->get(PPC::MTFSB1)).addImm(/* 38 - 32 = */ 6);
BuildMI(BB, dl, TII->get(PPC::B)).addMBB(exitMBB);
BB->addSuccessor(exitMBB);
BB = exitMBB;
} else {
llvm_unreachable("Unexpected instr type to insert");
}
MI->eraseFromParent(); // The pseudo instruction is gone now.
return BB;
}
//===----------------------------------------------------------------------===//
// Target Optimization Hooks
//===----------------------------------------------------------------------===//
SDValue PPCTargetLowering::DAGCombineFastRecip(SDValue Op,
DAGCombinerInfo &DCI) const {
if (DCI.isAfterLegalizeVectorOps())
return SDValue();
EVT VT = Op.getValueType();
if ((VT == MVT::f32 && PPCSubTarget.hasFRES()) ||
(VT == MVT::f64 && PPCSubTarget.hasFRE()) ||
(VT == MVT::v4f32 && PPCSubTarget.hasAltivec())) {
// Newton iteration for a function: F(X) is X_{i+1} = X_i - F(X_i)/F'(X_i)
// For the reciprocal, we need to find the zero of the function:
// F(X) = A X - 1 [which has a zero at X = 1/A]
// =>
// X_{i+1} = X_i (2 - A X_i) = X_i + X_i (1 - A X_i) [this second form
// does not require additional intermediate precision]
// Convergence is quadratic, so we essentially double the number of digits
// correct after every iteration. The minimum architected relative
// accuracy is 2^-5. When hasRecipPrec(), this is 2^-14. IEEE float has
// 23 digits and double has 52 digits.
int Iterations = PPCSubTarget.hasRecipPrec() ? 1 : 3;
if (VT.getScalarType() == MVT::f64)
++Iterations;
SelectionDAG &DAG = DCI.DAG;
SDLoc dl(Op);
SDValue FPOne =
DAG.getConstantFP(1.0, VT.getScalarType());
if (VT.isVector()) {
assert(VT.getVectorNumElements() == 4 &&
"Unknown vector type");
FPOne = DAG.getNode(ISD::BUILD_VECTOR, dl, VT,
FPOne, FPOne, FPOne, FPOne);
}
SDValue Est = DAG.getNode(PPCISD::FRE, dl, VT, Op);
DCI.AddToWorklist(Est.getNode());
// Newton iterations: Est = Est + Est (1 - Arg * Est)
for (int i = 0; i < Iterations; ++i) {
SDValue NewEst = DAG.getNode(ISD::FMUL, dl, VT, Op, Est);
DCI.AddToWorklist(NewEst.getNode());
NewEst = DAG.getNode(ISD::FSUB, dl, VT, FPOne, NewEst);
DCI.AddToWorklist(NewEst.getNode());
NewEst = DAG.getNode(ISD::FMUL, dl, VT, Est, NewEst);
DCI.AddToWorklist(NewEst.getNode());
Est = DAG.getNode(ISD::FADD, dl, VT, Est, NewEst);
DCI.AddToWorklist(Est.getNode());
}
return Est;
}
return SDValue();
}
SDValue PPCTargetLowering::DAGCombineFastRecipFSQRT(SDValue Op,
DAGCombinerInfo &DCI) const {
if (DCI.isAfterLegalizeVectorOps())
return SDValue();
EVT VT = Op.getValueType();
if ((VT == MVT::f32 && PPCSubTarget.hasFRSQRTES()) ||
(VT == MVT::f64 && PPCSubTarget.hasFRSQRTE()) ||
(VT == MVT::v4f32 && PPCSubTarget.hasAltivec())) {
// Newton iteration for a function: F(X) is X_{i+1} = X_i - F(X_i)/F'(X_i)
// For the reciprocal sqrt, we need to find the zero of the function:
// F(X) = 1/X^2 - A [which has a zero at X = 1/sqrt(A)]
// =>
// X_{i+1} = X_i (1.5 - A X_i^2 / 2)
// As a result, we precompute A/2 prior to the iteration loop.
// Convergence is quadratic, so we essentially double the number of digits
// correct after every iteration. The minimum architected relative
// accuracy is 2^-5. When hasRecipPrec(), this is 2^-14. IEEE float has
// 23 digits and double has 52 digits.
int Iterations = PPCSubTarget.hasRecipPrec() ? 1 : 3;
if (VT.getScalarType() == MVT::f64)
++Iterations;
SelectionDAG &DAG = DCI.DAG;
SDLoc dl(Op);
SDValue FPThreeHalves =
DAG.getConstantFP(1.5, VT.getScalarType());
if (VT.isVector()) {
assert(VT.getVectorNumElements() == 4 &&
"Unknown vector type");
FPThreeHalves = DAG.getNode(ISD::BUILD_VECTOR, dl, VT,
FPThreeHalves, FPThreeHalves,
FPThreeHalves, FPThreeHalves);
}
SDValue Est = DAG.getNode(PPCISD::FRSQRTE, dl, VT, Op);
DCI.AddToWorklist(Est.getNode());
// We now need 0.5*Arg which we can write as (1.5*Arg - Arg) so that
// this entire sequence requires only one FP constant.
SDValue HalfArg = DAG.getNode(ISD::FMUL, dl, VT, FPThreeHalves, Op);
DCI.AddToWorklist(HalfArg.getNode());
HalfArg = DAG.getNode(ISD::FSUB, dl, VT, HalfArg, Op);
DCI.AddToWorklist(HalfArg.getNode());
// Newton iterations: Est = Est * (1.5 - HalfArg * Est * Est)
for (int i = 0; i < Iterations; ++i) {
SDValue NewEst = DAG.getNode(ISD::FMUL, dl, VT, Est, Est);
DCI.AddToWorklist(NewEst.getNode());
NewEst = DAG.getNode(ISD::FMUL, dl, VT, HalfArg, NewEst);
DCI.AddToWorklist(NewEst.getNode());
NewEst = DAG.getNode(ISD::FSUB, dl, VT, FPThreeHalves, NewEst);
DCI.AddToWorklist(NewEst.getNode());
Est = DAG.getNode(ISD::FMUL, dl, VT, Est, NewEst);
DCI.AddToWorklist(Est.getNode());
}
return Est;
}
return SDValue();
}
// Like SelectionDAG::isConsecutiveLoad, but also works for stores, and does
// not enforce equality of the chain operands.
static bool isConsecutiveLS(LSBaseSDNode *LS, LSBaseSDNode *Base,
unsigned Bytes, int Dist,
SelectionDAG &DAG) {
EVT VT = LS->getMemoryVT();
if (VT.getSizeInBits() / 8 != Bytes)
return false;
SDValue Loc = LS->getBasePtr();
SDValue BaseLoc = Base->getBasePtr();
if (Loc.getOpcode() == ISD::FrameIndex) {
if (BaseLoc.getOpcode() != ISD::FrameIndex)
return false;
const MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
int FI = cast<FrameIndexSDNode>(Loc)->getIndex();
int BFI = cast<FrameIndexSDNode>(BaseLoc)->getIndex();
int FS = MFI->getObjectSize(FI);
int BFS = MFI->getObjectSize(BFI);
if (FS != BFS || FS != (int)Bytes) return false;
return MFI->getObjectOffset(FI) == (MFI->getObjectOffset(BFI) + Dist*Bytes);
}
// Handle X+C
if (DAG.isBaseWithConstantOffset(Loc) && Loc.getOperand(0) == BaseLoc &&
cast<ConstantSDNode>(Loc.getOperand(1))->getSExtValue() == Dist*Bytes)
return true;
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
const GlobalValue *GV1 = NULL;
const GlobalValue *GV2 = NULL;
int64_t Offset1 = 0;
int64_t Offset2 = 0;
bool isGA1 = TLI.isGAPlusOffset(Loc.getNode(), GV1, Offset1);
bool isGA2 = TLI.isGAPlusOffset(BaseLoc.getNode(), GV2, Offset2);
if (isGA1 && isGA2 && GV1 == GV2)
return Offset1 == (Offset2 + Dist*Bytes);
return false;
}
// Return true is there is a nearyby consecutive load to the one provided
// (regardless of alignment). We search up and down the chain, looking though
// token factors and other loads (but nothing else). As a result, a true
// results indicates that it is safe to create a new consecutive load adjacent
// to the load provided.
static bool findConsecutiveLoad(LoadSDNode *LD, SelectionDAG &DAG) {
SDValue Chain = LD->getChain();
EVT VT = LD->getMemoryVT();
SmallSet<SDNode *, 16> LoadRoots;
SmallVector<SDNode *, 8> Queue(1, Chain.getNode());
SmallSet<SDNode *, 16> Visited;
// First, search up the chain, branching to follow all token-factor operands.
// If we find a consecutive load, then we're done, otherwise, record all
// nodes just above the top-level loads and token factors.
while (!Queue.empty()) {
SDNode *ChainNext = Queue.pop_back_val();
if (!Visited.insert(ChainNext))
continue;
if (LoadSDNode *ChainLD = dyn_cast<LoadSDNode>(ChainNext)) {
if (isConsecutiveLS(ChainLD, LD, VT.getStoreSize(), 1, DAG))
return true;
if (!Visited.count(ChainLD->getChain().getNode()))
Queue.push_back(ChainLD->getChain().getNode());
} else if (ChainNext->getOpcode() == ISD::TokenFactor) {
for (SDNode::op_iterator O = ChainNext->op_begin(),
OE = ChainNext->op_end(); O != OE; ++O)
if (!Visited.count(O->getNode()))
Queue.push_back(O->getNode());
} else
LoadRoots.insert(ChainNext);
}
// Second, search down the chain, starting from the top-level nodes recorded
// in the first phase. These top-level nodes are the nodes just above all
// loads and token factors. Starting with their uses, recursively look though
// all loads (just the chain uses) and token factors to find a consecutive
// load.
Visited.clear();
Queue.clear();
for (SmallSet<SDNode *, 16>::iterator I = LoadRoots.begin(),
IE = LoadRoots.end(); I != IE; ++I) {
Queue.push_back(*I);
while (!Queue.empty()) {
SDNode *LoadRoot = Queue.pop_back_val();
if (!Visited.insert(LoadRoot))
continue;
if (LoadSDNode *ChainLD = dyn_cast<LoadSDNode>(LoadRoot))
if (isConsecutiveLS(ChainLD, LD, VT.getStoreSize(), 1, DAG))
return true;
for (SDNode::use_iterator UI = LoadRoot->use_begin(),
UE = LoadRoot->use_end(); UI != UE; ++UI)
if (((isa<LoadSDNode>(*UI) &&
cast<LoadSDNode>(*UI)->getChain().getNode() == LoadRoot) ||
UI->getOpcode() == ISD::TokenFactor) && !Visited.count(*UI))
Queue.push_back(*UI);
}
}
return false;
}
SDValue PPCTargetLowering::PerformDAGCombine(SDNode *N,
DAGCombinerInfo &DCI) const {
const TargetMachine &TM = getTargetMachine();
SelectionDAG &DAG = DCI.DAG;
SDLoc dl(N);
switch (N->getOpcode()) {
default: break;
case PPCISD::SHL:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
if (C->isNullValue()) // 0 << V -> 0.
return N->getOperand(0);
}
break;
case PPCISD::SRL:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
if (C->isNullValue()) // 0 >>u V -> 0.
return N->getOperand(0);
}
break;
case PPCISD::SRA:
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(0))) {
if (C->isNullValue() || // 0 >>s V -> 0.
C->isAllOnesValue()) // -1 >>s V -> -1.
return N->getOperand(0);
}
break;
case ISD::FDIV: {
assert(TM.Options.UnsafeFPMath &&
"Reciprocal estimates require UnsafeFPMath");
if (N->getOperand(1).getOpcode() == ISD::FSQRT) {
SDValue RV =
DAGCombineFastRecipFSQRT(N->getOperand(1).getOperand(0), DCI);
if (RV.getNode() != 0) {
DCI.AddToWorklist(RV.getNode());
return DAG.getNode(ISD::FMUL, dl, N->getValueType(0),
N->getOperand(0), RV);
}
} else if (N->getOperand(1).getOpcode() == ISD::FP_EXTEND &&
N->getOperand(1).getOperand(0).getOpcode() == ISD::FSQRT) {
SDValue RV =
DAGCombineFastRecipFSQRT(N->getOperand(1).getOperand(0).getOperand(0),
DCI);
if (RV.getNode() != 0) {
DCI.AddToWorklist(RV.getNode());
RV = DAG.getNode(ISD::FP_EXTEND, SDLoc(N->getOperand(1)),
N->getValueType(0), RV);
DCI.AddToWorklist(RV.getNode());
return DAG.getNode(ISD::FMUL, dl, N->getValueType(0),
N->getOperand(0), RV);
}
} else if (N->getOperand(1).getOpcode() == ISD::FP_ROUND &&
N->getOperand(1).getOperand(0).getOpcode() == ISD::FSQRT) {
SDValue RV =
DAGCombineFastRecipFSQRT(N->getOperand(1).getOperand(0).getOperand(0),
DCI);
if (RV.getNode() != 0) {
DCI.AddToWorklist(RV.getNode());
RV = DAG.getNode(ISD::FP_ROUND, SDLoc(N->getOperand(1)),
N->getValueType(0), RV,
N->getOperand(1).getOperand(1));
DCI.AddToWorklist(RV.getNode());
return DAG.getNode(ISD::FMUL, dl, N->getValueType(0),
N->getOperand(0), RV);
}
}
SDValue RV = DAGCombineFastRecip(N->getOperand(1), DCI);
if (RV.getNode() != 0) {
DCI.AddToWorklist(RV.getNode());
return DAG.getNode(ISD::FMUL, dl, N->getValueType(0),
N->getOperand(0), RV);
}
}
break;
case ISD::FSQRT: {
assert(TM.Options.UnsafeFPMath &&
"Reciprocal estimates require UnsafeFPMath");
// Compute this as 1/(1/sqrt(X)), which is the reciprocal of the
// reciprocal sqrt.
SDValue RV = DAGCombineFastRecipFSQRT(N->getOperand(0), DCI);
if (RV.getNode() != 0) {
DCI.AddToWorklist(RV.getNode());
RV = DAGCombineFastRecip(RV, DCI);
if (RV.getNode() != 0)
return RV;
}
}
break;
case ISD::SINT_TO_FP:
if (TM.getSubtarget<PPCSubtarget>().has64BitSupport()) {
if (N->getOperand(0).getOpcode() == ISD::FP_TO_SINT) {
// Turn (sint_to_fp (fp_to_sint X)) -> fctidz/fcfid without load/stores.
// We allow the src/dst to be either f32/f64, but the intermediate
// type must be i64.
if (N->getOperand(0).getValueType() == MVT::i64 &&
N->getOperand(0).getOperand(0).getValueType() != MVT::ppcf128) {
SDValue Val = N->getOperand(0).getOperand(0);
if (Val.getValueType() == MVT::f32) {
Val = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Val);
DCI.AddToWorklist(Val.getNode());
}
Val = DAG.getNode(PPCISD::FCTIDZ, dl, MVT::f64, Val);
DCI.AddToWorklist(Val.getNode());
Val = DAG.getNode(PPCISD::FCFID, dl, MVT::f64, Val);
DCI.AddToWorklist(Val.getNode());
if (N->getValueType(0) == MVT::f32) {
Val = DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, Val,
DAG.getIntPtrConstant(0));
DCI.AddToWorklist(Val.getNode());
}
return Val;
} else if (N->getOperand(0).getValueType() == MVT::i32) {
// If the intermediate type is i32, we can avoid the load/store here
// too.
}
}
}
break;
case ISD::STORE:
// Turn STORE (FP_TO_SINT F) -> STFIWX(FCTIWZ(F)).
if (TM.getSubtarget<PPCSubtarget>().hasSTFIWX() &&
!cast<StoreSDNode>(N)->isTruncatingStore() &&
N->getOperand(1).getOpcode() == ISD::FP_TO_SINT &&
N->getOperand(1).getValueType() == MVT::i32 &&
N->getOperand(1).getOperand(0).getValueType() != MVT::ppcf128) {
SDValue Val = N->getOperand(1).getOperand(0);
if (Val.getValueType() == MVT::f32) {
Val = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, Val);
DCI.AddToWorklist(Val.getNode());
}
Val = DAG.getNode(PPCISD::FCTIWZ, dl, MVT::f64, Val);
DCI.AddToWorklist(Val.getNode());
SDValue Ops[] = {
N->getOperand(0), Val, N->getOperand(2),
DAG.getValueType(N->getOperand(1).getValueType())
};
Val = DAG.getMemIntrinsicNode(PPCISD::STFIWX, dl,
DAG.getVTList(MVT::Other), Ops, array_lengthof(Ops),
cast<StoreSDNode>(N)->getMemoryVT(),
cast<StoreSDNode>(N)->getMemOperand());
DCI.AddToWorklist(Val.getNode());
return Val;
}
// Turn STORE (BSWAP) -> sthbrx/stwbrx.
if (cast<StoreSDNode>(N)->isUnindexed() &&
N->getOperand(1).getOpcode() == ISD::BSWAP &&
N->getOperand(1).getNode()->hasOneUse() &&
(N->getOperand(1).getValueType() == MVT::i32 ||
N->getOperand(1).getValueType() == MVT::i16 ||
(TM.getSubtarget<PPCSubtarget>().hasLDBRX() &&
TM.getSubtarget<PPCSubtarget>().isPPC64() &&
N->getOperand(1).getValueType() == MVT::i64))) {
SDValue BSwapOp = N->getOperand(1).getOperand(0);
// Do an any-extend to 32-bits if this is a half-word input.
if (BSwapOp.getValueType() == MVT::i16)
BSwapOp = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, BSwapOp);
SDValue Ops[] = {
N->getOperand(0), BSwapOp, N->getOperand(2),
DAG.getValueType(N->getOperand(1).getValueType())
};
return
DAG.getMemIntrinsicNode(PPCISD::STBRX, dl, DAG.getVTList(MVT::Other),
Ops, array_lengthof(Ops),
cast<StoreSDNode>(N)->getMemoryVT(),
cast<StoreSDNode>(N)->getMemOperand());
}
break;
case ISD::LOAD: {
LoadSDNode *LD = cast<LoadSDNode>(N);
EVT VT = LD->getValueType(0);
Type *Ty = LD->getMemoryVT().getTypeForEVT(*DAG.getContext());
unsigned ABIAlignment = getDataLayout()->getABITypeAlignment(Ty);
if (ISD::isNON_EXTLoad(N) && VT.isVector() &&
TM.getSubtarget<PPCSubtarget>().hasAltivec() &&
DCI.getDAGCombineLevel() == AfterLegalizeTypes &&
LD->getAlignment() < ABIAlignment) {
// This is a type-legal unaligned Altivec load.
SDValue Chain = LD->getChain();
SDValue Ptr = LD->getBasePtr();
// This implements the loading of unaligned vectors as described in
// the venerable Apple Velocity Engine overview. Specifically:
// https://developer.apple.com/hardwaredrivers/ve/alignment.html
// https://developer.apple.com/hardwaredrivers/ve/code_optimization.html
//
// The general idea is to expand a sequence of one or more unaligned
// loads into a alignment-based permutation-control instruction (lvsl),
// a series of regular vector loads (which always truncate their
// input address to an aligned address), and a series of permutations.
// The results of these permutations are the requested loaded values.
// The trick is that the last "extra" load is not taken from the address
// you might suspect (sizeof(vector) bytes after the last requested
// load), but rather sizeof(vector) - 1 bytes after the last
// requested vector. The point of this is to avoid a page fault if the
// base address happend to be aligned. This works because if the base
// address is aligned, then adding less than a full vector length will
// cause the last vector in the sequence to be (re)loaded. Otherwise,
// the next vector will be fetched as you might suspect was necessary.
// We might be able to reuse the permutation generation from
// a different base address offset from this one by an aligned amount.
// The INTRINSIC_WO_CHAIN DAG combine will attempt to perform this
// optimization later.
SDValue PermCntl = BuildIntrinsicOp(Intrinsic::ppc_altivec_lvsl, Ptr,
DAG, dl, MVT::v16i8);
// Refine the alignment of the original load (a "new" load created here
// which was identical to the first except for the alignment would be
// merged with the existing node regardless).
MachineFunction &MF = DAG.getMachineFunction();
MachineMemOperand *MMO =
MF.getMachineMemOperand(LD->getPointerInfo(),
LD->getMemOperand()->getFlags(),
LD->getMemoryVT().getStoreSize(),
ABIAlignment);
LD->refineAlignment(MMO);
SDValue BaseLoad = SDValue(LD, 0);
// Note that the value of IncOffset (which is provided to the next
// load's pointer info offset value, and thus used to calculate the
// alignment), and the value of IncValue (which is actually used to
// increment the pointer value) are different! This is because we
// require the next load to appear to be aligned, even though it
// is actually offset from the base pointer by a lesser amount.
int IncOffset = VT.getSizeInBits() / 8;
int IncValue = IncOffset;
// Walk (both up and down) the chain looking for another load at the real
// (aligned) offset (the alignment of the other load does not matter in
// this case). If found, then do not use the offset reduction trick, as
// that will prevent the loads from being later combined (as they would
// otherwise be duplicates).
if (!findConsecutiveLoad(LD, DAG))
--IncValue;
SDValue Increment = DAG.getConstant(IncValue, getPointerTy());
Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
SDValue ExtraLoad =
DAG.getLoad(VT, dl, Chain, Ptr,
LD->getPointerInfo().getWithOffset(IncOffset),
LD->isVolatile(), LD->isNonTemporal(),
LD->isInvariant(), ABIAlignment);
SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
BaseLoad.getValue(1), ExtraLoad.getValue(1));
if (BaseLoad.getValueType() != MVT::v4i32)
BaseLoad = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, BaseLoad);
if (ExtraLoad.getValueType() != MVT::v4i32)
ExtraLoad = DAG.getNode(ISD::BITCAST, dl, MVT::v4i32, ExtraLoad);
SDValue Perm = BuildIntrinsicOp(Intrinsic::ppc_altivec_vperm,
BaseLoad, ExtraLoad, PermCntl, DAG, dl);
if (VT != MVT::v4i32)
Perm = DAG.getNode(ISD::BITCAST, dl, VT, Perm);
// Now we need to be really careful about how we update the users of the
// original load. We cannot just call DCI.CombineTo (or
// DAG.ReplaceAllUsesWith for that matter), because the load still has
// uses created here (the permutation for example) that need to stay.
SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
while (UI != UE) {
SDUse &Use = UI.getUse();
SDNode *User = *UI;
// Note: BaseLoad is checked here because it might not be N, but a
// bitcast of N.
if (User == Perm.getNode() || User == BaseLoad.getNode() ||
User == TF.getNode() || Use.getResNo() > 1) {
++UI;
continue;
}
SDValue To = Use.getResNo() ? TF : Perm;
++UI;
SmallVector<SDValue, 8> Ops;
for (SDNode::op_iterator O = User->op_begin(),
OE = User->op_end(); O != OE; ++O) {
if (*O == Use)
Ops.push_back(To);
else
Ops.push_back(*O);
}
DAG.UpdateNodeOperands(User, Ops.data(), Ops.size());
}
return SDValue(N, 0);
}
}
break;
case ISD::INTRINSIC_WO_CHAIN:
if (cast<ConstantSDNode>(N->getOperand(0))->getZExtValue() ==
Intrinsic::ppc_altivec_lvsl &&
N->getOperand(1)->getOpcode() == ISD::ADD) {
SDValue Add = N->getOperand(1);
if (DAG.MaskedValueIsZero(Add->getOperand(1),
APInt::getAllOnesValue(4 /* 16 byte alignment */).zext(
Add.getValueType().getScalarType().getSizeInBits()))) {
SDNode *BasePtr = Add->getOperand(0).getNode();
for (SDNode::use_iterator UI = BasePtr->use_begin(),
UE = BasePtr->use_end(); UI != UE; ++UI) {
if (UI->getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
cast<ConstantSDNode>(UI->getOperand(0))->getZExtValue() ==
Intrinsic::ppc_altivec_lvsl) {
// We've found another LVSL, and this address if an aligned
// multiple of that one. The results will be the same, so use the
// one we've just found instead.
return SDValue(*UI, 0);
}
}
}
}
case ISD::BSWAP:
// Turn BSWAP (LOAD) -> lhbrx/lwbrx.
if (ISD::isNON_EXTLoad(N->getOperand(0).getNode()) &&
N->getOperand(0).hasOneUse() &&
(N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i16 ||
(TM.getSubtarget<PPCSubtarget>().hasLDBRX() &&
TM.getSubtarget<PPCSubtarget>().isPPC64() &&
N->getValueType(0) == MVT::i64))) {
SDValue Load = N->getOperand(0);
LoadSDNode *LD = cast<LoadSDNode>(Load);
// Create the byte-swapping load.
SDValue Ops[] = {
LD->getChain(), // Chain
LD->getBasePtr(), // Ptr
DAG.getValueType(N->getValueType(0)) // VT
};
SDValue BSLoad =
DAG.getMemIntrinsicNode(PPCISD::LBRX, dl,
DAG.getVTList(N->getValueType(0) == MVT::i64 ?
MVT::i64 : MVT::i32, MVT::Other),
Ops, 3, LD->getMemoryVT(), LD->getMemOperand());
// If this is an i16 load, insert the truncate.
SDValue ResVal = BSLoad;
if (N->getValueType(0) == MVT::i16)
ResVal = DAG.getNode(ISD::TRUNCATE, dl, MVT::i16, BSLoad);
// First, combine the bswap away. This makes the value produced by the
// load dead.
DCI.CombineTo(N, ResVal);
// Next, combine the load away, we give it a bogus result value but a real
// chain result. The result value is dead because the bswap is dead.
DCI.CombineTo(Load.getNode(), ResVal, BSLoad.getValue(1));
// Return N so it doesn't get rechecked!
return SDValue(N, 0);
}
break;
case PPCISD::VCMP: {
// If a VCMPo node already exists with exactly the same operands as this
// node, use its result instead of this node (VCMPo computes both a CR6 and
// a normal output).
//
if (!N->getOperand(0).hasOneUse() &&
!N->getOperand(1).hasOneUse() &&
!N->getOperand(2).hasOneUse()) {
// Scan all of the users of the LHS, looking for VCMPo's that match.
SDNode *VCMPoNode = 0;
SDNode *LHSN = N->getOperand(0).getNode();
for (SDNode::use_iterator UI = LHSN->use_begin(), E = LHSN->use_end();
UI != E; ++UI)
if (UI->getOpcode() == PPCISD::VCMPo &&
UI->getOperand(1) == N->getOperand(1) &&
UI->getOperand(2) == N->getOperand(2) &&
UI->getOperand(0) == N->getOperand(0)) {
VCMPoNode = *UI;
break;
}
// If there is no VCMPo node, or if the flag value has a single use, don't
// transform this.
if (!VCMPoNode || VCMPoNode->hasNUsesOfValue(0, 1))
break;
// Look at the (necessarily single) use of the flag value. If it has a
// chain, this transformation is more complex. Note that multiple things
// could use the value result, which we should ignore.
SDNode *FlagUser = 0;
for (SDNode::use_iterator UI = VCMPoNode->use_begin();
FlagUser == 0; ++UI) {
assert(UI != VCMPoNode->use_end() && "Didn't find user!");
SDNode *User = *UI;
for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) {
if (User->getOperand(i) == SDValue(VCMPoNode, 1)) {
FlagUser = User;
break;
}
}
}
// If the user is a MFOCRF instruction, we know this is safe.
// Otherwise we give up for right now.
if (FlagUser->getOpcode() == PPCISD::MFOCRF)
return SDValue(VCMPoNode, 0);
}
break;
}
case ISD::BR_CC: {
// If this is a branch on an altivec predicate comparison, lower this so
// that we don't have to do a MFOCRF: instead, branch directly on CR6. This
// lowering is done pre-legalize, because the legalizer lowers the predicate
// compare down to code that is difficult to reassemble.
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
SDValue LHS = N->getOperand(2), RHS = N->getOperand(3);
// Sometimes the promoted value of the intrinsic is ANDed by some non-zero
// value. If so, pass-through the AND to get to the intrinsic.
if (LHS.getOpcode() == ISD::AND &&
LHS.getOperand(0).getOpcode() == ISD::INTRINSIC_W_CHAIN &&
cast<ConstantSDNode>(LHS.getOperand(0).getOperand(1))->getZExtValue() ==
Intrinsic::ppc_is_decremented_ctr_nonzero &&
isa<ConstantSDNode>(LHS.getOperand(1)) &&
!cast<ConstantSDNode>(LHS.getOperand(1))->getConstantIntValue()->
isZero())
LHS = LHS.getOperand(0);
if (LHS.getOpcode() == ISD::INTRINSIC_W_CHAIN &&
cast<ConstantSDNode>(LHS.getOperand(1))->getZExtValue() ==
Intrinsic::ppc_is_decremented_ctr_nonzero &&
isa<ConstantSDNode>(RHS)) {
assert((CC == ISD::SETEQ || CC == ISD::SETNE) &&
"Counter decrement comparison is not EQ or NE");
unsigned Val = cast<ConstantSDNode>(RHS)->getZExtValue();
bool isBDNZ = (CC == ISD::SETEQ && Val) ||
(CC == ISD::SETNE && !Val);
// We now need to make the intrinsic dead (it cannot be instruction
// selected).
DAG.ReplaceAllUsesOfValueWith(LHS.getValue(1), LHS.getOperand(0));
assert(LHS.getNode()->hasOneUse() &&
"Counter decrement has more than one use");
return DAG.getNode(isBDNZ ? PPCISD::BDNZ : PPCISD::BDZ, dl, MVT::Other,
N->getOperand(0), N->getOperand(4));
}
int CompareOpc;
bool isDot;
if (LHS.getOpcode() == ISD::INTRINSIC_WO_CHAIN &&
isa<ConstantSDNode>(RHS) && (CC == ISD::SETEQ || CC == ISD::SETNE) &&
getAltivecCompareInfo(LHS, CompareOpc, isDot)) {
assert(isDot && "Can't compare against a vector result!");
// If this is a comparison against something other than 0/1, then we know
// that the condition is never/always true.
unsigned Val = cast<ConstantSDNode>(RHS)->getZExtValue();
if (Val != 0 && Val != 1) {
if (CC == ISD::SETEQ) // Cond never true, remove branch.
return N->getOperand(0);
// Always !=, turn it into an unconditional branch.
return DAG.getNode(ISD::BR, dl, MVT::Other,
N->getOperand(0), N->getOperand(4));
}
bool BranchOnWhenPredTrue = (CC == ISD::SETEQ) ^ (Val == 0);
// Create the PPCISD altivec 'dot' comparison node.
SDValue Ops[] = {
LHS.getOperand(2), // LHS of compare
LHS.getOperand(3), // RHS of compare
DAG.getConstant(CompareOpc, MVT::i32)
};
EVT VTs[] = { LHS.getOperand(2).getValueType(), MVT::Glue };
SDValue CompNode = DAG.getNode(PPCISD::VCMPo, dl, VTs, Ops, 3);
// Unpack the result based on how the target uses it.
PPC::Predicate CompOpc;
switch (cast<ConstantSDNode>(LHS.getOperand(1))->getZExtValue()) {
default: // Can't happen, don't crash on invalid number though.
case 0: // Branch on the value of the EQ bit of CR6.
CompOpc = BranchOnWhenPredTrue ? PPC::PRED_EQ : PPC::PRED_NE;
break;
case 1: // Branch on the inverted value of the EQ bit of CR6.
CompOpc = BranchOnWhenPredTrue ? PPC::PRED_NE : PPC::PRED_EQ;
break;
case 2: // Branch on the value of the LT bit of CR6.
CompOpc = BranchOnWhenPredTrue ? PPC::PRED_LT : PPC::PRED_GE;
break;
case 3: // Branch on the inverted value of the LT bit of CR6.
CompOpc = BranchOnWhenPredTrue ? PPC::PRED_GE : PPC::PRED_LT;
break;
}
return DAG.getNode(PPCISD::COND_BRANCH, dl, MVT::Other, N->getOperand(0),
DAG.getConstant(CompOpc, MVT::i32),
DAG.getRegister(PPC::CR6, MVT::i32),
N->getOperand(4), CompNode.getValue(1));
}
break;
}
}
return SDValue();
}
//===----------------------------------------------------------------------===//
// Inline Assembly Support
//===----------------------------------------------------------------------===//
void PPCTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
APInt &KnownZero,
APInt &KnownOne,
const SelectionDAG &DAG,
unsigned Depth) const {
KnownZero = KnownOne = APInt(KnownZero.getBitWidth(), 0);
switch (Op.getOpcode()) {
default: break;
case PPCISD::LBRX: {
// lhbrx is known to have the top bits cleared out.
if (cast<VTSDNode>(Op.getOperand(2))->getVT() == MVT::i16)
KnownZero = 0xFFFF0000;
break;
}
case ISD::INTRINSIC_WO_CHAIN: {
switch (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue()) {
default: break;
case Intrinsic::ppc_altivec_vcmpbfp_p:
case Intrinsic::ppc_altivec_vcmpeqfp_p:
case Intrinsic::ppc_altivec_vcmpequb_p:
case Intrinsic::ppc_altivec_vcmpequh_p:
case Intrinsic::ppc_altivec_vcmpequw_p:
case Intrinsic::ppc_altivec_vcmpgefp_p:
case Intrinsic::ppc_altivec_vcmpgtfp_p:
case Intrinsic::ppc_altivec_vcmpgtsb_p:
case Intrinsic::ppc_altivec_vcmpgtsh_p:
case Intrinsic::ppc_altivec_vcmpgtsw_p:
case Intrinsic::ppc_altivec_vcmpgtub_p:
case Intrinsic::ppc_altivec_vcmpgtuh_p:
case Intrinsic::ppc_altivec_vcmpgtuw_p:
KnownZero = ~1U; // All bits but the low one are known to be zero.
break;
}
}
}
}
/// getConstraintType - Given a constraint, return the type of
/// constraint it is for this target.
PPCTargetLowering::ConstraintType
PPCTargetLowering::getConstraintType(const std::string &Constraint) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
default: break;
case 'b':
case 'r':
case 'f':
case 'v':
case 'y':
return C_RegisterClass;
case 'Z':
// FIXME: While Z does indicate a memory constraint, it specifically
// indicates an r+r address (used in conjunction with the 'y' modifier
// in the replacement string). Currently, we're forcing the base
// register to be r0 in the asm printer (which is interpreted as zero)
// and forming the complete address in the second register. This is
// suboptimal.
return C_Memory;
}
}
return TargetLowering::getConstraintType(Constraint);
}
/// Examine constraint type and operand type and determine a weight value.
/// This object must already have been set up with the operand type
/// and the current alternative constraint selected.
TargetLowering::ConstraintWeight
PPCTargetLowering::getSingleConstraintMatchWeight(
AsmOperandInfo &info, const char *constraint) const {
ConstraintWeight weight = CW_Invalid;
Value *CallOperandVal = info.CallOperandVal;
// If we don't have a value, we can't do a match,
// but allow it at the lowest weight.
if (CallOperandVal == NULL)
return CW_Default;
Type *type = CallOperandVal->getType();
// Look at the constraint type.
switch (*constraint) {
default:
weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
break;
case 'b':
if (type->isIntegerTy())
weight = CW_Register;
break;
case 'f':
if (type->isFloatTy())
weight = CW_Register;
break;
case 'd':
if (type->isDoubleTy())
weight = CW_Register;
break;
case 'v':
if (type->isVectorTy())
weight = CW_Register;
break;
case 'y':
weight = CW_Register;
break;
case 'Z':
weight = CW_Memory;
break;
}
return weight;
}
std::pair<unsigned, const TargetRegisterClass*>
PPCTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
MVT VT) const {
if (Constraint.size() == 1) {
// GCC RS6000 Constraint Letters
switch (Constraint[0]) {
case 'b': // R1-R31
if (VT == MVT::i64 && PPCSubTarget.isPPC64())
return std::make_pair(0U, &PPC::G8RC_NOX0RegClass);
return std::make_pair(0U, &PPC::GPRC_NOR0RegClass);
case 'r': // R0-R31
if (VT == MVT::i64 && PPCSubTarget.isPPC64())
return std::make_pair(0U, &PPC::G8RCRegClass);
return std::make_pair(0U, &PPC::GPRCRegClass);
case 'f':
if (VT == MVT::f32 || VT == MVT::i32)
return std::make_pair(0U, &PPC::F4RCRegClass);
if (VT == MVT::f64 || VT == MVT::i64)
return std::make_pair(0U, &PPC::F8RCRegClass);
break;
case 'v':
return std::make_pair(0U, &PPC::VRRCRegClass);
case 'y': // crrc
return std::make_pair(0U, &PPC::CRRCRegClass);
}
}
return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
}
/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
/// vector. If it is invalid, don't add anything to Ops.
void PPCTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
std::string &Constraint,
std::vector<SDValue>&Ops,
SelectionDAG &DAG) const {
SDValue Result(0,0);
// Only support length 1 constraints.
if (Constraint.length() > 1) return;
char Letter = Constraint[0];
switch (Letter) {
default: break;
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'O':
case 'P': {
ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Op);
if (!CST) return; // Must be an immediate to match.
unsigned Value = CST->getZExtValue();
switch (Letter) {
default: llvm_unreachable("Unknown constraint letter!");
case 'I': // "I" is a signed 16-bit constant.
if ((short)Value == (int)Value)
Result = DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'J': // "J" is a constant with only the high-order 16 bits nonzero.
case 'L': // "L" is a signed 16-bit constant shifted left 16 bits.
if ((short)Value == 0)
Result = DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'K': // "K" is a constant with only the low-order 16 bits nonzero.
if ((Value >> 16) == 0)
Result = DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'M': // "M" is a constant that is greater than 31.
if (Value > 31)
Result = DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'N': // "N" is a positive constant that is an exact power of two.
if ((int)Value > 0 && isPowerOf2_32(Value))
Result = DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'O': // "O" is the constant zero.
if (Value == 0)
Result = DAG.getTargetConstant(Value, Op.getValueType());
break;
case 'P': // "P" is a constant whose negation is a signed 16-bit constant.
if ((short)-Value == (int)-Value)
Result = DAG.getTargetConstant(Value, Op.getValueType());
break;
}
break;
}
}
if (Result.getNode()) {
Ops.push_back(Result);
return;
}
// Handle standard constraint letters.
TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
}
// isLegalAddressingMode - Return true if the addressing mode represented
// by AM is legal for this target, for a load/store of the specified type.
bool PPCTargetLowering::isLegalAddressingMode(const AddrMode &AM,
Type *Ty) const {
// FIXME: PPC does not allow r+i addressing modes for vectors!
// PPC allows a sign-extended 16-bit immediate field.
if (AM.BaseOffs <= -(1LL << 16) || AM.BaseOffs >= (1LL << 16)-1)
return false;
// No global is ever allowed as a base.
if (AM.BaseGV)
return false;
// PPC only support r+r,
switch (AM.Scale) {
case 0: // "r+i" or just "i", depending on HasBaseReg.
break;
case 1:
if (AM.HasBaseReg && AM.BaseOffs) // "r+r+i" is not allowed.
return false;
// Otherwise we have r+r or r+i.
break;
case 2:
if (AM.HasBaseReg || AM.BaseOffs) // 2*r+r or 2*r+i is not allowed.
return false;
// Allow 2*r as r+r.
break;
default:
// No other scales are supported.
return false;
}
return true;
}
SDValue PPCTargetLowering::LowerRETURNADDR(SDValue Op,
SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MFI->setReturnAddressIsTaken(true);
SDLoc dl(Op);
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
// Make sure the function does not optimize away the store of the RA to
// the stack.
PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
FuncInfo->setLRStoreRequired();
bool isPPC64 = PPCSubTarget.isPPC64();
bool isDarwinABI = PPCSubTarget.isDarwinABI();
if (Depth > 0) {
SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
SDValue Offset =
DAG.getConstant(PPCFrameLowering::getReturnSaveOffset(isPPC64, isDarwinABI),
isPPC64? MVT::i64 : MVT::i32);
return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
DAG.getNode(ISD::ADD, dl, getPointerTy(),
FrameAddr, Offset),
MachinePointerInfo(), false, false, false, 0);
}
// Just load the return address off the stack.
SDValue RetAddrFI = getReturnAddrFrameIndex(DAG);
return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
RetAddrFI, MachinePointerInfo(), false, false, false, 0);
}
SDValue PPCTargetLowering::LowerFRAMEADDR(SDValue Op,
SelectionDAG &DAG) const {
SDLoc dl(Op);
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
bool isPPC64 = PtrVT == MVT::i64;
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MFI->setFrameAddressIsTaken(true);
// Naked functions never have a frame pointer, and so we use r1. For all
// other functions, this decision must be delayed until during PEI.
unsigned FrameReg;
if (MF.getFunction()->getAttributes().hasAttribute(
AttributeSet::FunctionIndex, Attribute::Naked))
FrameReg = isPPC64 ? PPC::X1 : PPC::R1;
else
FrameReg = isPPC64 ? PPC::FP8 : PPC::FP;
SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg,
PtrVT);
while (Depth--)
FrameAddr = DAG.getLoad(Op.getValueType(), dl, DAG.getEntryNode(),
FrameAddr, MachinePointerInfo(), false, false,
false, 0);
return FrameAddr;
}
bool
PPCTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
// The PowerPC target isn't yet aware of offsets.
return false;
}
/// getOptimalMemOpType - Returns the target specific optimal type for load
/// and store operations as a result of memset, memcpy, and memmove
/// lowering. If DstAlign is zero that means it's safe to destination
/// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
/// means there isn't a need to check it against alignment requirement,
/// probably because the source does not need to be loaded. If 'IsMemset' is
/// true, that means it's expanding a memset. If 'ZeroMemset' is true, that
/// means it's a memset of zero. 'MemcpyStrSrc' indicates whether the memcpy
/// source is constant so it does not need to be loaded.
/// It returns EVT::Other if the type should be determined using generic
/// target-independent logic.
EVT PPCTargetLowering::getOptimalMemOpType(uint64_t Size,
unsigned DstAlign, unsigned SrcAlign,
bool IsMemset, bool ZeroMemset,
bool MemcpyStrSrc,
MachineFunction &MF) const {
if (this->PPCSubTarget.isPPC64()) {
return MVT::i64;
} else {
return MVT::i32;
}
}
bool PPCTargetLowering::allowsUnalignedMemoryAccesses(EVT VT,
bool *Fast) const {
if (DisablePPCUnaligned)
return false;
// PowerPC supports unaligned memory access for simple non-vector types.
// Although accessing unaligned addresses is not as efficient as accessing
// aligned addresses, it is generally more efficient than manual expansion,
// and generally only traps for software emulation when crossing page
// boundaries.
if (!VT.isSimple())
return false;
if (VT.getSimpleVT().isVector())
return false;
if (VT == MVT::ppcf128)
return false;
if (Fast)
*Fast = true;
return true;
}
/// isFMAFasterThanMulAndAdd - Return true if an FMA operation is faster than
/// a pair of mul and add instructions. fmuladd intrinsics will be expanded to
/// FMAs when this method returns true (and FMAs are legal), otherwise fmuladd
/// is expanded to mul + add.
bool PPCTargetLowering::isFMAFasterThanMulAndAdd(EVT VT) const {
if (!VT.isSimple())
return false;
switch (VT.getSimpleVT().SimpleTy) {
case MVT::f32:
case MVT::f64:
case MVT::v4f32:
return true;
default:
break;
}
return false;
}
Sched::Preference PPCTargetLowering::getSchedulingPreference(SDNode *N) const {
if (DisableILPPref)
return TargetLowering::getSchedulingPreference(N);
return Sched::ILP;
}
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