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llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
Hal Finkel dea837d3c5 [PowerPC] Guard against illegal selection of add for TargetConstant operands 
r208640 was reverted because it caused a self-hosting failure on ppc64. The
underlying cause was the formation of ISD::ADD nodes with ISD::TargetConstant
operands. Because we have no patterns for 'add' taking 'timm' nodes, these are
selected as r+r add instructions (which is a miscompile). Guard against this
kind of behavior in the future by making the backend crash should this occur
(instead of silently generating invalid output).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216897 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-02 06:23:54 +00:00

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//===-- PPCISelDAGToDAG.cpp - PPC --pattern matching inst selector --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a pattern matching instruction selector for PowerPC,
// converting from a legalized dag to a PPC dag.
//
//===----------------------------------------------------------------------===//
#include "PPC.h"
#include "MCTargetDesc/PPCPredicates.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCTargetMachine.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.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;
#define DEBUG_TYPE "ppc-codegen"
// FIXME: Remove this once the bug has been fixed!
cl::opt<bool> ANDIGlueBug("expose-ppc-andi-glue-bug",
cl::desc("expose the ANDI glue bug on PPC"), cl::Hidden);
namespace llvm {
void initializePPCDAGToDAGISelPass(PassRegistry&);
}
namespace {
//===--------------------------------------------------------------------===//
/// PPCDAGToDAGISel - PPC specific code to select PPC machine
/// instructions for SelectionDAG operations.
///
class PPCDAGToDAGISel : public SelectionDAGISel {
const PPCTargetMachine &TM;
const PPCTargetLowering *PPCLowering;
const PPCSubtarget *PPCSubTarget;
unsigned GlobalBaseReg;
public:
explicit PPCDAGToDAGISel(PPCTargetMachine &tm)
: SelectionDAGISel(tm), TM(tm),
PPCLowering(TM.getSubtargetImpl()->getTargetLowering()),
PPCSubTarget(TM.getSubtargetImpl()) {
initializePPCDAGToDAGISelPass(*PassRegistry::getPassRegistry());
}
bool runOnMachineFunction(MachineFunction &MF) override {
// Make sure we re-emit a set of the global base reg if necessary
GlobalBaseReg = 0;
PPCLowering = TM.getSubtargetImpl()->getTargetLowering();
PPCSubTarget = TM.getSubtargetImpl();
SelectionDAGISel::runOnMachineFunction(MF);
if (!PPCSubTarget->isSVR4ABI())
InsertVRSaveCode(MF);
return true;
}
void PostprocessISelDAG() override;
/// getI32Imm - Return a target constant with the specified value, of type
/// i32.
inline SDValue getI32Imm(unsigned Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i32);
}
/// getI64Imm - Return a target constant with the specified value, of type
/// i64.
inline SDValue getI64Imm(uint64_t Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i64);
}
/// getSmallIPtrImm - Return a target constant of pointer type.
inline SDValue getSmallIPtrImm(unsigned Imm) {
return CurDAG->getTargetConstant(Imm, PPCLowering->getPointerTy());
}
/// isRunOfOnes - Returns true iff Val consists of one contiguous run of 1s
/// with any number of 0s on either side. The 1s are allowed to wrap from
/// LSB to MSB, so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs.
/// 0x0F0F0000 is not, since all 1s are not contiguous.
static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME);
/// isRotateAndMask - Returns true if Mask and Shift can be folded into a
/// rotate and mask opcode and mask operation.
static bool isRotateAndMask(SDNode *N, unsigned Mask, bool isShiftMask,
unsigned &SH, unsigned &MB, unsigned &ME);
/// getGlobalBaseReg - insert code into the entry mbb to materialize the PIC
/// base register. Return the virtual register that holds this value.
SDNode *getGlobalBaseReg();
// Select - Convert the specified operand from a target-independent to a
// target-specific node if it hasn't already been changed.
SDNode *Select(SDNode *N) override;
SDNode *SelectBitfieldInsert(SDNode *N);
/// SelectCC - Select a comparison of the specified values with the
/// specified condition code, returning the CR# of the expression.
SDValue SelectCC(SDValue LHS, SDValue RHS, ISD::CondCode CC, SDLoc dl);
/// SelectAddrImm - Returns true if the address N can be represented by
/// a base register plus a signed 16-bit displacement [r+imm].
bool SelectAddrImm(SDValue N, SDValue &Disp,
SDValue &Base) {
return PPCLowering->SelectAddressRegImm(N, Disp, Base, *CurDAG, false);
}
/// SelectAddrImmOffs - Return true if the operand is valid for a preinc
/// immediate field. Note that the operand at this point is already the
/// result of a prior SelectAddressRegImm call.
bool SelectAddrImmOffs(SDValue N, SDValue &Out) const {
if (N.getOpcode() == ISD::TargetConstant ||
N.getOpcode() == ISD::TargetGlobalAddress) {
Out = N;
return true;
}
return false;
}
/// SelectAddrIdx - Given the specified addressed, check to see if it can be
/// represented as an indexed [r+r] operation. Returns false if it can
/// be represented by [r+imm], which are preferred.
bool SelectAddrIdx(SDValue N, SDValue &Base, SDValue &Index) {
return PPCLowering->SelectAddressRegReg(N, Base, Index, *CurDAG);
}
/// SelectAddrIdxOnly - Given the specified addressed, force it to be
/// represented as an indexed [r+r] operation.
bool SelectAddrIdxOnly(SDValue N, SDValue &Base, SDValue &Index) {
return PPCLowering->SelectAddressRegRegOnly(N, Base, Index, *CurDAG);
}
/// SelectAddrImmX4 - Returns true if the address N can be represented by
/// a base register plus a signed 16-bit displacement that is a multiple of 4.
/// Suitable for use by STD and friends.
bool SelectAddrImmX4(SDValue N, SDValue &Disp, SDValue &Base) {
return PPCLowering->SelectAddressRegImm(N, Disp, Base, *CurDAG, true);
}
// Select an address into a single register.
bool SelectAddr(SDValue N, SDValue &Base) {
Base = N;
return true;
}
/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
/// inline asm expressions. It is always correct to compute the value into
/// a register. The case of adding a (possibly relocatable) constant to a
/// register can be improved, but it is wrong to substitute Reg+Reg for
/// Reg in an asm, because the load or store opcode would have to change.
bool SelectInlineAsmMemoryOperand(const SDValue &Op,
char ConstraintCode,
std::vector<SDValue> &OutOps) override {
OutOps.push_back(Op);
return false;
}
void InsertVRSaveCode(MachineFunction &MF);
const char *getPassName() const override {
return "PowerPC DAG->DAG Pattern Instruction Selection";
}
// Include the pieces autogenerated from the target description.
#include "PPCGenDAGISel.inc"
private:
SDNode *SelectSETCC(SDNode *N);
void PeepholePPC64();
void PeepholeCROps();
bool AllUsersSelectZero(SDNode *N);
void SwapAllSelectUsers(SDNode *N);
};
}
/// InsertVRSaveCode - Once the entire function has been instruction selected,
/// all virtual registers are created and all machine instructions are built,
/// check to see if we need to save/restore VRSAVE. If so, do it.
void PPCDAGToDAGISel::InsertVRSaveCode(MachineFunction &Fn) {
// Check to see if this function uses vector registers, which means we have to
// save and restore the VRSAVE register and update it with the regs we use.
//
// In this case, there will be virtual registers of vector type created
// by the scheduler. Detect them now.
bool HasVectorVReg = false;
for (unsigned i = 0, e = RegInfo->getNumVirtRegs(); i != e; ++i) {
unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
if (RegInfo->getRegClass(Reg) == &PPC::VRRCRegClass) {
HasVectorVReg = true;
break;
}
}
if (!HasVectorVReg) return; // nothing to do.
// If we have a vector register, we want to emit code into the entry and exit
// blocks to save and restore the VRSAVE register. We do this here (instead
// of marking all vector instructions as clobbering VRSAVE) for two reasons:
//
// 1. This (trivially) reduces the load on the register allocator, by not
// having to represent the live range of the VRSAVE register.
// 2. This (more significantly) allows us to create a temporary virtual
// register to hold the saved VRSAVE value, allowing this temporary to be
// register allocated, instead of forcing it to be spilled to the stack.
// Create two vregs - one to hold the VRSAVE register that is live-in to the
// function and one for the value after having bits or'd into it.
unsigned InVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
unsigned UpdatedVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
const TargetInstrInfo &TII = *TM.getSubtargetImpl()->getInstrInfo();
MachineBasicBlock &EntryBB = *Fn.begin();
DebugLoc dl;
// Emit the following code into the entry block:
// InVRSAVE = MFVRSAVE
// UpdatedVRSAVE = UPDATE_VRSAVE InVRSAVE
// MTVRSAVE UpdatedVRSAVE
MachineBasicBlock::iterator IP = EntryBB.begin(); // Insert Point
BuildMI(EntryBB, IP, dl, TII.get(PPC::MFVRSAVE), InVRSAVE);
BuildMI(EntryBB, IP, dl, TII.get(PPC::UPDATE_VRSAVE),
UpdatedVRSAVE).addReg(InVRSAVE);
BuildMI(EntryBB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(UpdatedVRSAVE);
// Find all return blocks, outputting a restore in each epilog.
for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
if (!BB->empty() && BB->back().isReturn()) {
IP = BB->end(); --IP;
// Skip over all terminator instructions, which are part of the return
// sequence.
MachineBasicBlock::iterator I2 = IP;
while (I2 != BB->begin() && (--I2)->isTerminator())
IP = I2;
// Emit: MTVRSAVE InVRSave
BuildMI(*BB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(InVRSAVE);
}
}
}
/// getGlobalBaseReg - Output the instructions required to put the
/// base address to use for accessing globals into a register.
///
SDNode *PPCDAGToDAGISel::getGlobalBaseReg() {
if (!GlobalBaseReg) {
const TargetInstrInfo &TII = *TM.getSubtargetImpl()->getInstrInfo();
// Insert the set of GlobalBaseReg into the first MBB of the function
MachineBasicBlock &FirstMBB = MF->front();
MachineBasicBlock::iterator MBBI = FirstMBB.begin();
DebugLoc dl;
if (PPCLowering->getPointerTy() == MVT::i32) {
if (PPCSubTarget->isTargetELF())
GlobalBaseReg = PPC::R30;
else
GlobalBaseReg =
RegInfo->createVirtualRegister(&PPC::GPRC_NOR0RegClass);
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR));
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
if (PPCSubTarget->isTargetELF()) {
unsigned TempReg = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
BuildMI(FirstMBB, MBBI, dl,
TII.get(PPC::GetGBRO), TempReg).addReg(GlobalBaseReg);
BuildMI(FirstMBB, MBBI, dl,
TII.get(PPC::UpdateGBR)).addReg(GlobalBaseReg).addReg(TempReg);
MF->getInfo<PPCFunctionInfo>()->setUsesPICBase(true);
}
} else {
GlobalBaseReg = RegInfo->createVirtualRegister(&PPC::G8RC_NOX0RegClass);
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR8));
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR8), GlobalBaseReg);
}
}
return CurDAG->getRegister(GlobalBaseReg,
PPCLowering->getPointerTy()).getNode();
}
/// 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);
}
/// isInt32Immediate - This method tests to see if the node is a 32-bit constant
/// operand. If so Imm will receive the 32-bit value.
static bool isInt32Immediate(SDNode *N, unsigned &Imm) {
if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) {
Imm = cast<ConstantSDNode>(N)->getZExtValue();
return true;
}
return false;
}
/// isInt64Immediate - This method tests to see if the node is a 64-bit constant
/// operand. If so Imm will receive the 64-bit value.
static bool isInt64Immediate(SDNode *N, uint64_t &Imm) {
if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i64) {
Imm = cast<ConstantSDNode>(N)->getZExtValue();
return true;
}
return false;
}
// isInt32Immediate - This method tests to see if a constant operand.
// If so Imm will receive the 32 bit value.
static bool isInt32Immediate(SDValue N, unsigned &Imm) {
return isInt32Immediate(N.getNode(), Imm);
}
// isOpcWithIntImmediate - This method tests to see if the node is a specific
// opcode and that it has a immediate integer right operand.
// If so Imm will receive the 32 bit value.
static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) {
return N->getOpcode() == Opc
&& isInt32Immediate(N->getOperand(1).getNode(), Imm);
}
bool PPCDAGToDAGISel::isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
if (!Val)
return false;
if (isShiftedMask_32(Val)) {
// look for the first non-zero bit
MB = countLeadingZeros(Val);
// look for the first zero bit after the run of ones
ME = countLeadingZeros((Val - 1) ^ Val);
return true;
} else {
Val = ~Val; // invert mask
if (isShiftedMask_32(Val)) {
// effectively look for the first zero bit
ME = countLeadingZeros(Val) - 1;
// effectively look for the first one bit after the run of zeros
MB = countLeadingZeros((Val - 1) ^ Val) + 1;
return true;
}
}
// no run present
return false;
}
bool PPCDAGToDAGISel::isRotateAndMask(SDNode *N, unsigned Mask,
bool isShiftMask, unsigned &SH,
unsigned &MB, unsigned &ME) {
// Don't even go down this path for i64, since different logic will be
// necessary for rldicl/rldicr/rldimi.
if (N->getValueType(0) != MVT::i32)
return false;
unsigned Shift = 32;
unsigned Indeterminant = ~0; // bit mask marking indeterminant results
unsigned Opcode = N->getOpcode();
if (N->getNumOperands() != 2 ||
!isInt32Immediate(N->getOperand(1).getNode(), Shift) || (Shift > 31))
return false;
if (Opcode == ISD::SHL) {
// apply shift left to mask if it comes first
if (isShiftMask) Mask = Mask << Shift;
// determine which bits are made indeterminant by shift
Indeterminant = ~(0xFFFFFFFFu << Shift);
} else if (Opcode == ISD::SRL) {
// apply shift right to mask if it comes first
if (isShiftMask) Mask = Mask >> Shift;
// determine which bits are made indeterminant by shift
Indeterminant = ~(0xFFFFFFFFu >> Shift);
// adjust for the left rotate
Shift = 32 - Shift;
} else if (Opcode == ISD::ROTL) {
Indeterminant = 0;
} else {
return false;
}
// if the mask doesn't intersect any Indeterminant bits
if (Mask && !(Mask & Indeterminant)) {
SH = Shift & 31;
// make sure the mask is still a mask (wrap arounds may not be)
return isRunOfOnes(Mask, MB, ME);
}
return false;
}
/// SelectBitfieldInsert - turn an or of two masked values into
/// the rotate left word immediate then mask insert (rlwimi) instruction.
SDNode *PPCDAGToDAGISel::SelectBitfieldInsert(SDNode *N) {
SDValue Op0 = N->getOperand(0);
SDValue Op1 = N->getOperand(1);
SDLoc dl(N);
APInt LKZ, LKO, RKZ, RKO;
CurDAG->computeKnownBits(Op0, LKZ, LKO);
CurDAG->computeKnownBits(Op1, RKZ, RKO);
unsigned TargetMask = LKZ.getZExtValue();
unsigned InsertMask = RKZ.getZExtValue();
if ((TargetMask | InsertMask) == 0xFFFFFFFF) {
unsigned Op0Opc = Op0.getOpcode();
unsigned Op1Opc = Op1.getOpcode();
unsigned Value, SH = 0;
TargetMask = ~TargetMask;
InsertMask = ~InsertMask;
// If the LHS has a foldable shift and the RHS does not, then swap it to the
// RHS so that we can fold the shift into the insert.
if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) {
if (Op0.getOperand(0).getOpcode() == ISD::SHL ||
Op0.getOperand(0).getOpcode() == ISD::SRL) {
if (Op1.getOperand(0).getOpcode() != ISD::SHL &&
Op1.getOperand(0).getOpcode() != ISD::SRL) {
std::swap(Op0, Op1);
std::swap(Op0Opc, Op1Opc);
std::swap(TargetMask, InsertMask);
}
}
} else if (Op0Opc == ISD::SHL || Op0Opc == ISD::SRL) {
if (Op1Opc == ISD::AND && Op1.getOperand(0).getOpcode() != ISD::SHL &&
Op1.getOperand(0).getOpcode() != ISD::SRL) {
std::swap(Op0, Op1);
std::swap(Op0Opc, Op1Opc);
std::swap(TargetMask, InsertMask);
}
}
unsigned MB, ME;
if (isRunOfOnes(InsertMask, MB, ME)) {
SDValue Tmp1, Tmp2;
if ((Op1Opc == ISD::SHL || Op1Opc == ISD::SRL) &&
isInt32Immediate(Op1.getOperand(1), Value)) {
Op1 = Op1.getOperand(0);
SH = (Op1Opc == ISD::SHL) ? Value : 32 - Value;
}
if (Op1Opc == ISD::AND) {
// The AND mask might not be a constant, and we need to make sure that
// if we're going to fold the masking with the insert, all bits not
// know to be zero in the mask are known to be one.
APInt MKZ, MKO;
CurDAG->computeKnownBits(Op1.getOperand(1), MKZ, MKO);
bool CanFoldMask = InsertMask == MKO.getZExtValue();
unsigned SHOpc = Op1.getOperand(0).getOpcode();
if ((SHOpc == ISD::SHL || SHOpc == ISD::SRL) && CanFoldMask &&
isInt32Immediate(Op1.getOperand(0).getOperand(1), Value)) {
// Note that Value must be in range here (less than 32) because
// otherwise there would not be any bits set in InsertMask.
Op1 = Op1.getOperand(0).getOperand(0);
SH = (SHOpc == ISD::SHL) ? Value : 32 - Value;
}
}
SH &= 31;
SDValue Ops[] = { Op0, Op1, getI32Imm(SH), getI32Imm(MB),
getI32Imm(ME) };
return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops);
}
}
return nullptr;
}
/// SelectCC - Select a comparison of the specified values with the specified
/// condition code, returning the CR# of the expression.
SDValue PPCDAGToDAGISel::SelectCC(SDValue LHS, SDValue RHS,
ISD::CondCode CC, SDLoc dl) {
// Always select the LHS.
unsigned Opc;
if (LHS.getValueType() == MVT::i32) {
unsigned Imm;
if (CC == ISD::SETEQ || CC == ISD::SETNE) {
if (isInt32Immediate(RHS, Imm)) {
// SETEQ/SETNE comparison with 16-bit immediate, fold it.
if (isUInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
// If this is a 16-bit signed immediate, fold it.
if (isInt<16>((int)Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
// For non-equality comparisons, the default code would materialize the
// constant, then compare against it, like this:
// lis r2, 4660
// ori r2, r2, 22136
// cmpw cr0, r3, r2
// Since we are just comparing for equality, we can emit this instead:
// xoris r0,r3,0x1234
// cmplwi cr0,r0,0x5678
// beq cr0,L6
SDValue Xor(CurDAG->getMachineNode(PPC::XORIS, dl, MVT::i32, LHS,
getI32Imm(Imm >> 16)), 0);
return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, Xor,
getI32Imm(Imm & 0xFFFF)), 0);
}
Opc = PPC::CMPLW;
} else if (ISD::isUnsignedIntSetCC(CC)) {
if (isInt32Immediate(RHS, Imm) && isUInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
Opc = PPC::CMPLW;
} else {
short SImm;
if (isIntS16Immediate(RHS, SImm))
return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
getI32Imm((int)SImm & 0xFFFF)),
0);
Opc = PPC::CMPW;
}
} else if (LHS.getValueType() == MVT::i64) {
uint64_t Imm;
if (CC == ISD::SETEQ || CC == ISD::SETNE) {
if (isInt64Immediate(RHS.getNode(), Imm)) {
// SETEQ/SETNE comparison with 16-bit immediate, fold it.
if (isUInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
// If this is a 16-bit signed immediate, fold it.
if (isInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
// For non-equality comparisons, the default code would materialize the
// constant, then compare against it, like this:
// lis r2, 4660
// ori r2, r2, 22136
// cmpd cr0, r3, r2
// Since we are just comparing for equality, we can emit this instead:
// xoris r0,r3,0x1234
// cmpldi cr0,r0,0x5678
// beq cr0,L6
if (isUInt<32>(Imm)) {
SDValue Xor(CurDAG->getMachineNode(PPC::XORIS8, dl, MVT::i64, LHS,
getI64Imm(Imm >> 16)), 0);
return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, Xor,
getI64Imm(Imm & 0xFFFF)), 0);
}
}
Opc = PPC::CMPLD;
} else if (ISD::isUnsignedIntSetCC(CC)) {
if (isInt64Immediate(RHS.getNode(), Imm) && isUInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
getI64Imm(Imm & 0xFFFF)), 0);
Opc = PPC::CMPLD;
} else {
short SImm;
if (isIntS16Immediate(RHS, SImm))
return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
getI64Imm(SImm & 0xFFFF)),
0);
Opc = PPC::CMPD;
}
} else if (LHS.getValueType() == MVT::f32) {
Opc = PPC::FCMPUS;
} else {
assert(LHS.getValueType() == MVT::f64 && "Unknown vt!");
Opc = PPCSubTarget->hasVSX() ? PPC::XSCMPUDP : PPC::FCMPUD;
}
return SDValue(CurDAG->getMachineNode(Opc, dl, MVT::i32, LHS, RHS), 0);
}
static PPC::Predicate getPredicateForSetCC(ISD::CondCode CC) {
switch (CC) {
case ISD::SETUEQ:
case ISD::SETONE:
case ISD::SETOLE:
case ISD::SETOGE:
llvm_unreachable("Should be lowered by legalize!");
default: llvm_unreachable("Unknown condition!");
case ISD::SETOEQ:
case ISD::SETEQ: return PPC::PRED_EQ;
case ISD::SETUNE:
case ISD::SETNE: return PPC::PRED_NE;
case ISD::SETOLT:
case ISD::SETLT: return PPC::PRED_LT;
case ISD::SETULE:
case ISD::SETLE: return PPC::PRED_LE;
case ISD::SETOGT:
case ISD::SETGT: return PPC::PRED_GT;
case ISD::SETUGE:
case ISD::SETGE: return PPC::PRED_GE;
case ISD::SETO: return PPC::PRED_NU;
case ISD::SETUO: return PPC::PRED_UN;
// These two are invalid for floating point. Assume we have int.
case ISD::SETULT: return PPC::PRED_LT;
case ISD::SETUGT: return PPC::PRED_GT;
}
}
/// getCRIdxForSetCC - Return the index of the condition register field
/// associated with the SetCC condition, and whether or not the field is
/// treated as inverted. That is, lt = 0; ge = 0 inverted.
static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool &Invert) {
Invert = false;
switch (CC) {
default: llvm_unreachable("Unknown condition!");
case ISD::SETOLT:
case ISD::SETLT: return 0; // Bit #0 = SETOLT
case ISD::SETOGT:
case ISD::SETGT: return 1; // Bit #1 = SETOGT
case ISD::SETOEQ:
case ISD::SETEQ: return 2; // Bit #2 = SETOEQ
case ISD::SETUO: return 3; // Bit #3 = SETUO
case ISD::SETUGE:
case ISD::SETGE: Invert = true; return 0; // !Bit #0 = SETUGE
case ISD::SETULE:
case ISD::SETLE: Invert = true; return 1; // !Bit #1 = SETULE
case ISD::SETUNE:
case ISD::SETNE: Invert = true; return 2; // !Bit #2 = SETUNE
case ISD::SETO: Invert = true; return 3; // !Bit #3 = SETO
case ISD::SETUEQ:
case ISD::SETOGE:
case ISD::SETOLE:
case ISD::SETONE:
llvm_unreachable("Invalid branch code: should be expanded by legalize");
// These are invalid for floating point. Assume integer.
case ISD::SETULT: return 0;
case ISD::SETUGT: return 1;
}
}
// getVCmpInst: return the vector compare instruction for the specified
// vector type and condition code. Since this is for altivec specific code,
// only support the altivec types (v16i8, v8i16, v4i32, and v4f32).
static unsigned int getVCmpInst(MVT VecVT, ISD::CondCode CC,
bool HasVSX, bool &Swap, bool &Negate) {
Swap = false;
Negate = false;
if (VecVT.isFloatingPoint()) {
/* Handle some cases by swapping input operands. */
switch (CC) {
case ISD::SETLE: CC = ISD::SETGE; Swap = true; break;
case ISD::SETLT: CC = ISD::SETGT; Swap = true; break;
case ISD::SETOLE: CC = ISD::SETOGE; Swap = true; break;
case ISD::SETOLT: CC = ISD::SETOGT; Swap = true; break;
case ISD::SETUGE: CC = ISD::SETULE; Swap = true; break;
case ISD::SETUGT: CC = ISD::SETULT; Swap = true; break;
default: break;
}
/* Handle some cases by negating the result. */
switch (CC) {
case ISD::SETNE: CC = ISD::SETEQ; Negate = true; break;
case ISD::SETUNE: CC = ISD::SETOEQ; Negate = true; break;
case ISD::SETULE: CC = ISD::SETOGT; Negate = true; break;
case ISD::SETULT: CC = ISD::SETOGE; Negate = true; break;
default: break;
}
/* We have instructions implementing the remaining cases. */
switch (CC) {
case ISD::SETEQ:
case ISD::SETOEQ:
if (VecVT == MVT::v4f32)
return HasVSX ? PPC::XVCMPEQSP : PPC::VCMPEQFP;
else if (VecVT == MVT::v2f64)
return PPC::XVCMPEQDP;
break;
case ISD::SETGT:
case ISD::SETOGT:
if (VecVT == MVT::v4f32)
return HasVSX ? PPC::XVCMPGTSP : PPC::VCMPGTFP;
else if (VecVT == MVT::v2f64)
return PPC::XVCMPGTDP;
break;
case ISD::SETGE:
case ISD::SETOGE:
if (VecVT == MVT::v4f32)
return HasVSX ? PPC::XVCMPGESP : PPC::VCMPGEFP;
else if (VecVT == MVT::v2f64)
return PPC::XVCMPGEDP;
break;
default:
break;
}
llvm_unreachable("Invalid floating-point vector compare condition");
} else {
/* Handle some cases by swapping input operands. */
switch (CC) {
case ISD::SETGE: CC = ISD::SETLE; Swap = true; break;
case ISD::SETLT: CC = ISD::SETGT; Swap = true; break;
case ISD::SETUGE: CC = ISD::SETULE; Swap = true; break;
case ISD::SETULT: CC = ISD::SETUGT; Swap = true; break;
default: break;
}
/* Handle some cases by negating the result. */
switch (CC) {
case ISD::SETNE: CC = ISD::SETEQ; Negate = true; break;
case ISD::SETUNE: CC = ISD::SETUEQ; Negate = true; break;
case ISD::SETLE: CC = ISD::SETGT; Negate = true; break;
case ISD::SETULE: CC = ISD::SETUGT; Negate = true; break;
default: break;
}
/* We have instructions implementing the remaining cases. */
switch (CC) {
case ISD::SETEQ:
case ISD::SETUEQ:
if (VecVT == MVT::v16i8)
return PPC::VCMPEQUB;
else if (VecVT == MVT::v8i16)
return PPC::VCMPEQUH;
else if (VecVT == MVT::v4i32)
return PPC::VCMPEQUW;
break;
case ISD::SETGT:
if (VecVT == MVT::v16i8)
return PPC::VCMPGTSB;
else if (VecVT == MVT::v8i16)
return PPC::VCMPGTSH;
else if (VecVT == MVT::v4i32)
return PPC::VCMPGTSW;
break;
case ISD::SETUGT:
if (VecVT == MVT::v16i8)
return PPC::VCMPGTUB;
else if (VecVT == MVT::v8i16)
return PPC::VCMPGTUH;
else if (VecVT == MVT::v4i32)
return PPC::VCMPGTUW;
break;
default:
break;
}
llvm_unreachable("Invalid integer vector compare condition");
}
}
SDNode *PPCDAGToDAGISel::SelectSETCC(SDNode *N) {
SDLoc dl(N);
unsigned Imm;
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
EVT PtrVT = CurDAG->getTargetLoweringInfo().getPointerTy();
bool isPPC64 = (PtrVT == MVT::i64);
if (!PPCSubTarget->useCRBits() &&
isInt32Immediate(N->getOperand(1), Imm)) {
// We can codegen setcc op, imm very efficiently compared to a brcond.
// Check for those cases here.
// setcc op, 0
if (Imm == 0) {
SDValue Op = N->getOperand(0);
switch (CC) {
default: break;
case ISD::SETEQ: {
Op = SDValue(CurDAG->getMachineNode(PPC::CNTLZW, dl, MVT::i32, Op), 0);
SDValue Ops[] = { Op, getI32Imm(27), getI32Imm(5), getI32Imm(31) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
case ISD::SETNE: {
if (isPPC64) break;
SDValue AD =
SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
Op, getI32Imm(~0U)), 0);
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op,
AD.getValue(1));
}
case ISD::SETLT: {
SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
case ISD::SETGT: {
SDValue T =
SDValue(CurDAG->getMachineNode(PPC::NEG, dl, MVT::i32, Op), 0);
T = SDValue(CurDAG->getMachineNode(PPC::ANDC, dl, MVT::i32, T, Op), 0);
SDValue Ops[] = { T, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
}
} else if (Imm == ~0U) { // setcc op, -1
SDValue Op = N->getOperand(0);
switch (CC) {
default: break;
case ISD::SETEQ:
if (isPPC64) break;
Op = SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
Op, getI32Imm(1)), 0);
return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
SDValue(CurDAG->getMachineNode(PPC::LI, dl,
MVT::i32,
getI32Imm(0)), 0),
Op.getValue(1));
case ISD::SETNE: {
if (isPPC64) break;
Op = SDValue(CurDAG->getMachineNode(PPC::NOR, dl, MVT::i32, Op, Op), 0);
SDNode *AD = CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
Op, getI32Imm(~0U));
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, SDValue(AD, 0),
Op, SDValue(AD, 1));
}
case ISD::SETLT: {
SDValue AD = SDValue(CurDAG->getMachineNode(PPC::ADDI, dl, MVT::i32, Op,
getI32Imm(1)), 0);
SDValue AN = SDValue(CurDAG->getMachineNode(PPC::AND, dl, MVT::i32, AD,
Op), 0);
SDValue Ops[] = { AN, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
case ISD::SETGT: {
SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
Op = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops),
0);
return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Op,
getI32Imm(1));
}
}
}
}
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
// Altivec Vector compare instructions do not set any CR register by default and
// vector compare operations return the same type as the operands.
if (LHS.getValueType().isVector()) {
EVT VecVT = LHS.getValueType();
bool Swap, Negate;
unsigned int VCmpInst = getVCmpInst(VecVT.getSimpleVT(), CC,
PPCSubTarget->hasVSX(), Swap, Negate);
if (Swap)
std::swap(LHS, RHS);
if (Negate) {
SDValue VCmp(CurDAG->getMachineNode(VCmpInst, dl, VecVT, LHS, RHS), 0);
return CurDAG->SelectNodeTo(N, PPCSubTarget->hasVSX() ? PPC::XXLNOR :
PPC::VNOR,
VecVT, VCmp, VCmp);
}
return CurDAG->SelectNodeTo(N, VCmpInst, VecVT, LHS, RHS);
}
if (PPCSubTarget->useCRBits())
return nullptr;
bool Inv;
unsigned Idx = getCRIdxForSetCC(CC, Inv);
SDValue CCReg = SelectCC(LHS, RHS, CC, dl);
SDValue IntCR;
// Force the ccreg into CR7.
SDValue CR7Reg = CurDAG->getRegister(PPC::CR7, MVT::i32);
SDValue InFlag(nullptr, 0); // Null incoming flag value.
CCReg = CurDAG->getCopyToReg(CurDAG->getEntryNode(), dl, CR7Reg, CCReg,
InFlag).getValue(1);
IntCR = SDValue(CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32, CR7Reg,
CCReg), 0);
SDValue Ops[] = { IntCR, getI32Imm((32-(3-Idx)) & 31),
getI32Imm(31), getI32Imm(31) };
if (!Inv)
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
// Get the specified bit.
SDValue Tmp =
SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops), 0);
return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Tmp, getI32Imm(1));
}
// Select - Convert the specified operand from a target-independent to a
// target-specific node if it hasn't already been changed.
SDNode *PPCDAGToDAGISel::Select(SDNode *N) {
SDLoc dl(N);
if (N->isMachineOpcode()) {
N->setNodeId(-1);
return nullptr; // Already selected.
}
// In case any misguided DAG-level optimizations form an ADD with a
// TargetConstant operand, crash here instead of miscompiling (by selecting
// an r+r add instead of some kind of r+i add).
if (N->getOpcode() == ISD::ADD &&
N->getOperand(1).getOpcode() == ISD::TargetConstant)
llvm_unreachable("Invalid ADD with TargetConstant operand");
switch (N->getOpcode()) {
default: break;
case ISD::Constant: {
if (N->getValueType(0) == MVT::i64) {
// Get 64 bit value.
int64_t Imm = cast<ConstantSDNode>(N)->getZExtValue();
// Assume no remaining bits.
unsigned Remainder = 0;
// Assume no shift required.
unsigned Shift = 0;
// If it can't be represented as a 32 bit value.
if (!isInt<32>(Imm)) {
Shift = countTrailingZeros<uint64_t>(Imm);
int64_t ImmSh = static_cast<uint64_t>(Imm) >> Shift;
// If the shifted value fits 32 bits.
if (isInt<32>(ImmSh)) {
// Go with the shifted value.
Imm = ImmSh;
} else {
// Still stuck with a 64 bit value.
Remainder = Imm;
Shift = 32;
Imm >>= 32;
}
}
// Intermediate operand.
SDNode *Result;
// Handle first 32 bits.
unsigned Lo = Imm & 0xFFFF;
unsigned Hi = (Imm >> 16) & 0xFFFF;
// Simple value.
if (isInt<16>(Imm)) {
// Just the Lo bits.
Result = CurDAG->getMachineNode(PPC::LI8, dl, MVT::i64, getI32Imm(Lo));
} else if (Lo) {
// Handle the Hi bits.
unsigned OpC = Hi ? PPC::LIS8 : PPC::LI8;
Result = CurDAG->getMachineNode(OpC, dl, MVT::i64, getI32Imm(Hi));
// And Lo bits.
Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
SDValue(Result, 0), getI32Imm(Lo));
} else {
// Just the Hi bits.
Result = CurDAG->getMachineNode(PPC::LIS8, dl, MVT::i64, getI32Imm(Hi));
}
// If no shift, we're done.
if (!Shift) return Result;
// Shift for next step if the upper 32-bits were not zero.
if (Imm) {
Result = CurDAG->getMachineNode(PPC::RLDICR, dl, MVT::i64,
SDValue(Result, 0),
getI32Imm(Shift),
getI32Imm(63 - Shift));
}
// Add in the last bits as required.
if ((Hi = (Remainder >> 16) & 0xFFFF)) {
Result = CurDAG->getMachineNode(PPC::ORIS8, dl, MVT::i64,
SDValue(Result, 0), getI32Imm(Hi));
}
if ((Lo = Remainder & 0xFFFF)) {
Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
SDValue(Result, 0), getI32Imm(Lo));
}
return Result;
}
break;
}
case ISD::SETCC: {
SDNode *SN = SelectSETCC(N);
if (SN)
return SN;
break;
}
case PPCISD::GlobalBaseReg:
return getGlobalBaseReg();
case ISD::FrameIndex: {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
SDValue TFI = CurDAG->getTargetFrameIndex(FI, N->getValueType(0));
unsigned Opc = N->getValueType(0) == MVT::i32 ? PPC::ADDI : PPC::ADDI8;
if (N->hasOneUse())
return CurDAG->SelectNodeTo(N, Opc, N->getValueType(0), TFI,
getSmallIPtrImm(0));
return CurDAG->getMachineNode(Opc, dl, N->getValueType(0), TFI,
getSmallIPtrImm(0));
}
case PPCISD::MFOCRF: {
SDValue InFlag = N->getOperand(1);
return CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32,
N->getOperand(0), InFlag);
}
case ISD::SDIV: {
// FIXME: since this depends on the setting of the carry flag from the srawi
// we should really be making notes about that for the scheduler.
// FIXME: It sure would be nice if we could cheaply recognize the
// srl/add/sra pattern the dag combiner will generate for this as
// sra/addze rather than having to handle sdiv ourselves. oh well.
unsigned Imm;
if (isInt32Immediate(N->getOperand(1), Imm)) {
SDValue N0 = N->getOperand(0);
if ((signed)Imm > 0 && isPowerOf2_32(Imm)) {
SDNode *Op =
CurDAG->getMachineNode(PPC::SRAWI, dl, MVT::i32, MVT::Glue,
N0, getI32Imm(Log2_32(Imm)));
return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
SDValue(Op, 0), SDValue(Op, 1));
} else if ((signed)Imm < 0 && isPowerOf2_32(-Imm)) {
SDNode *Op =
CurDAG->getMachineNode(PPC::SRAWI, dl, MVT::i32, MVT::Glue,
N0, getI32Imm(Log2_32(-Imm)));
SDValue PT =
SDValue(CurDAG->getMachineNode(PPC::ADDZE, dl, MVT::i32,
SDValue(Op, 0), SDValue(Op, 1)),
0);
return CurDAG->SelectNodeTo(N, PPC::NEG, MVT::i32, PT);
}
}
// Other cases are autogenerated.
break;
}
case ISD::LOAD: {
// Handle preincrement loads.
LoadSDNode *LD = cast<LoadSDNode>(N);
EVT LoadedVT = LD->getMemoryVT();
// Normal loads are handled by code generated from the .td file.
if (LD->getAddressingMode() != ISD::PRE_INC)
break;
SDValue Offset = LD->getOffset();
if (Offset.getOpcode() == ISD::TargetConstant ||
Offset.getOpcode() == ISD::TargetGlobalAddress) {
unsigned Opcode;
bool isSExt = LD->getExtensionType() == ISD::SEXTLOAD;
if (LD->getValueType(0) != MVT::i64) {
// Handle PPC32 integer and normal FP loads.
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
switch (LoadedVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid PPC load type!");
case MVT::f64: Opcode = PPC::LFDU; break;
case MVT::f32: Opcode = PPC::LFSU; break;
case MVT::i32: Opcode = PPC::LWZU; break;
case MVT::i16: Opcode = isSExt ? PPC::LHAU : PPC::LHZU; break;
case MVT::i1:
case MVT::i8: Opcode = PPC::LBZU; break;
}
} else {
assert(LD->getValueType(0) == MVT::i64 && "Unknown load result type!");
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
switch (LoadedVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid PPC load type!");
case MVT::i64: Opcode = PPC::LDU; break;
case MVT::i32: Opcode = PPC::LWZU8; break;
case MVT::i16: Opcode = isSExt ? PPC::LHAU8 : PPC::LHZU8; break;
case MVT::i1:
case MVT::i8: Opcode = PPC::LBZU8; break;
}
}
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Ops[] = { Offset, Base, Chain };
return CurDAG->getMachineNode(Opcode, dl, LD->getValueType(0),
PPCLowering->getPointerTy(),
MVT::Other, Ops);
} else {
unsigned Opcode;
bool isSExt = LD->getExtensionType() == ISD::SEXTLOAD;
if (LD->getValueType(0) != MVT::i64) {
// Handle PPC32 integer and normal FP loads.
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
switch (LoadedVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid PPC load type!");
case MVT::f64: Opcode = PPC::LFDUX; break;
case MVT::f32: Opcode = PPC::LFSUX; break;
case MVT::i32: Opcode = PPC::LWZUX; break;
case MVT::i16: Opcode = isSExt ? PPC::LHAUX : PPC::LHZUX; break;
case MVT::i1:
case MVT::i8: Opcode = PPC::LBZUX; break;
}
} else {
assert(LD->getValueType(0) == MVT::i64 && "Unknown load result type!");
assert((!isSExt || LoadedVT == MVT::i16 || LoadedVT == MVT::i32) &&
"Invalid sext update load");
switch (LoadedVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid PPC load type!");
case MVT::i64: Opcode = PPC::LDUX; break;
case MVT::i32: Opcode = isSExt ? PPC::LWAUX : PPC::LWZUX8; break;
case MVT::i16: Opcode = isSExt ? PPC::LHAUX8 : PPC::LHZUX8; break;
case MVT::i1:
case MVT::i8: Opcode = PPC::LBZUX8; break;
}
}
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Ops[] = { Base, Offset, Chain };
return CurDAG->getMachineNode(Opcode, dl, LD->getValueType(0),
PPCLowering->getPointerTy(),
MVT::Other, Ops);
}
}
case ISD::AND: {
unsigned Imm, Imm2, SH, MB, ME;
uint64_t Imm64;
// If this is an and of a value rotated between 0 and 31 bits and then and'd
// with a mask, emit rlwinm
if (isInt32Immediate(N->getOperand(1), Imm) &&
isRotateAndMask(N->getOperand(0).getNode(), Imm, false, SH, MB, ME)) {
SDValue Val = N->getOperand(0).getOperand(0);
SDValue Ops[] = { Val, getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
// If this is just a masked value where the input is not handled above, and
// is not a rotate-left (handled by a pattern in the .td file), emit rlwinm
if (isInt32Immediate(N->getOperand(1), Imm) &&
isRunOfOnes(Imm, MB, ME) &&
N->getOperand(0).getOpcode() != ISD::ROTL) {
SDValue Val = N->getOperand(0);
SDValue Ops[] = { Val, getI32Imm(0), getI32Imm(MB), getI32Imm(ME) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
// If this is a 64-bit zero-extension mask, emit rldicl.
if (isInt64Immediate(N->getOperand(1).getNode(), Imm64) &&
isMask_64(Imm64)) {
SDValue Val = N->getOperand(0);
MB = 64 - CountTrailingOnes_64(Imm64);
SH = 0;
// If the operand is a logical right shift, we can fold it into this
// instruction: rldicl(rldicl(x, 64-n, n), 0, mb) -> rldicl(x, 64-n, mb)
// for n <= mb. The right shift is really a left rotate followed by a
// mask, and this mask is a more-restrictive sub-mask of the mask implied
// by the shift.
if (Val.getOpcode() == ISD::SRL &&
isInt32Immediate(Val.getOperand(1).getNode(), Imm) && Imm <= MB) {
assert(Imm < 64 && "Illegal shift amount");
Val = Val.getOperand(0);
SH = 64 - Imm;
}
SDValue Ops[] = { Val, getI32Imm(SH), getI32Imm(MB) };
return CurDAG->SelectNodeTo(N, PPC::RLDICL, MVT::i64, Ops);
}
// AND X, 0 -> 0, not "rlwinm 32".
if (isInt32Immediate(N->getOperand(1), Imm) && (Imm == 0)) {
ReplaceUses(SDValue(N, 0), N->getOperand(1));
return nullptr;
}
// ISD::OR doesn't get all the bitfield insertion fun.
// (and (or x, c1), c2) where isRunOfOnes(~(c1^c2)) is a bitfield insert
if (isInt32Immediate(N->getOperand(1), Imm) &&
N->getOperand(0).getOpcode() == ISD::OR &&
isInt32Immediate(N->getOperand(0).getOperand(1), Imm2)) {
unsigned MB, ME;
Imm = ~(Imm^Imm2);
if (isRunOfOnes(Imm, MB, ME)) {
SDValue Ops[] = { N->getOperand(0).getOperand(0),
N->getOperand(0).getOperand(1),
getI32Imm(0), getI32Imm(MB),getI32Imm(ME) };
return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops);
}
}
// Other cases are autogenerated.
break;
}
case ISD::OR:
if (N->getValueType(0) == MVT::i32)
if (SDNode *I = SelectBitfieldInsert(N))
return I;
// Other cases are autogenerated.
break;
case ISD::SHL: {
unsigned Imm, SH, MB, ME;
if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
isRotateAndMask(N, Imm, true, SH, MB, ME)) {
SDValue Ops[] = { N->getOperand(0).getOperand(0),
getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
// Other cases are autogenerated.
break;
}
case ISD::SRL: {
unsigned Imm, SH, MB, ME;
if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
isRotateAndMask(N, Imm, true, SH, MB, ME)) {
SDValue Ops[] = { N->getOperand(0).getOperand(0),
getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
// Other cases are autogenerated.
break;
}
// FIXME: Remove this once the ANDI glue bug is fixed:
case PPCISD::ANDIo_1_EQ_BIT:
case PPCISD::ANDIo_1_GT_BIT: {
if (!ANDIGlueBug)
break;
EVT InVT = N->getOperand(0).getValueType();
assert((InVT == MVT::i64 || InVT == MVT::i32) &&
"Invalid input type for ANDIo_1_EQ_BIT");
unsigned Opcode = (InVT == MVT::i64) ? PPC::ANDIo8 : PPC::ANDIo;
SDValue AndI(CurDAG->getMachineNode(Opcode, dl, InVT, MVT::Glue,
N->getOperand(0),
CurDAG->getTargetConstant(1, InVT)), 0);
SDValue CR0Reg = CurDAG->getRegister(PPC::CR0, MVT::i32);
SDValue SRIdxVal =
CurDAG->getTargetConstant(N->getOpcode() == PPCISD::ANDIo_1_EQ_BIT ?
PPC::sub_eq : PPC::sub_gt, MVT::i32);
return CurDAG->SelectNodeTo(N, TargetOpcode::EXTRACT_SUBREG, MVT::i1,
CR0Reg, SRIdxVal,
SDValue(AndI.getNode(), 1) /* glue */);
}
case ISD::SELECT_CC: {
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
EVT PtrVT = CurDAG->getTargetLoweringInfo().getPointerTy();
bool isPPC64 = (PtrVT == MVT::i64);
// If this is a select of i1 operands, we'll pattern match it.
if (PPCSubTarget->useCRBits() &&
N->getOperand(0).getValueType() == MVT::i1)
break;
// Handle the setcc cases here. select_cc lhs, 0, 1, 0, cc
if (!isPPC64)
if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N->getOperand(1)))
if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N->getOperand(2)))
if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N->getOperand(3)))
if (N1C->isNullValue() && N3C->isNullValue() &&
N2C->getZExtValue() == 1ULL && CC == ISD::SETNE &&
// FIXME: Implement this optzn for PPC64.
N->getValueType(0) == MVT::i32) {
SDNode *Tmp =
CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
N->getOperand(0), getI32Imm(~0U));
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32,
SDValue(Tmp, 0), N->getOperand(0),
SDValue(Tmp, 1));
}
SDValue CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC, dl);
if (N->getValueType(0) == MVT::i1) {
// An i1 select is: (c & t) | (!c & f).
bool Inv;
unsigned Idx = getCRIdxForSetCC(CC, Inv);
unsigned SRI;
switch (Idx) {
default: llvm_unreachable("Invalid CC index");
case 0: SRI = PPC::sub_lt; break;
case 1: SRI = PPC::sub_gt; break;
case 2: SRI = PPC::sub_eq; break;
case 3: SRI = PPC::sub_un; break;
}
SDValue CCBit = CurDAG->getTargetExtractSubreg(SRI, dl, MVT::i1, CCReg);
SDValue NotCCBit(CurDAG->getMachineNode(PPC::CRNOR, dl, MVT::i1,
CCBit, CCBit), 0);
SDValue C = Inv ? NotCCBit : CCBit,
NotC = Inv ? CCBit : NotCCBit;
SDValue CAndT(CurDAG->getMachineNode(PPC::CRAND, dl, MVT::i1,
C, N->getOperand(2)), 0);
SDValue NotCAndF(CurDAG->getMachineNode(PPC::CRAND, dl, MVT::i1,
NotC, N->getOperand(3)), 0);
return CurDAG->SelectNodeTo(N, PPC::CROR, MVT::i1, CAndT, NotCAndF);
}
unsigned BROpc = getPredicateForSetCC(CC);
unsigned SelectCCOp;
if (N->getValueType(0) == MVT::i32)
SelectCCOp = PPC::SELECT_CC_I4;
else if (N->getValueType(0) == MVT::i64)
SelectCCOp = PPC::SELECT_CC_I8;
else if (N->getValueType(0) == MVT::f32)
SelectCCOp = PPC::SELECT_CC_F4;
else if (N->getValueType(0) == MVT::f64)
SelectCCOp = PPC::SELECT_CC_F8;
else
SelectCCOp = PPC::SELECT_CC_VRRC;
SDValue Ops[] = { CCReg, N->getOperand(2), N->getOperand(3),
getI32Imm(BROpc) };
return CurDAG->SelectNodeTo(N, SelectCCOp, N->getValueType(0), Ops);
}
case ISD::VSELECT:
if (PPCSubTarget->hasVSX()) {
SDValue Ops[] = { N->getOperand(2), N->getOperand(1), N->getOperand(0) };
return CurDAG->SelectNodeTo(N, PPC::XXSEL, N->getValueType(0), Ops);
}
break;
case ISD::VECTOR_SHUFFLE:
if (PPCSubTarget->hasVSX() && (N->getValueType(0) == MVT::v2f64 ||
N->getValueType(0) == MVT::v2i64)) {
ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
SDValue Op1 = N->getOperand(SVN->getMaskElt(0) < 2 ? 0 : 1),
Op2 = N->getOperand(SVN->getMaskElt(1) < 2 ? 0 : 1);
unsigned DM[2];
for (int i = 0; i < 2; ++i)
if (SVN->getMaskElt(i) <= 0 || SVN->getMaskElt(i) == 2)
DM[i] = 0;
else
DM[i] = 1;
SDValue DMV = CurDAG->getTargetConstant(DM[1] | (DM[0] << 1), MVT::i32);
if (Op1 == Op2 && DM[0] == 0 && DM[1] == 0 &&
Op1.getOpcode() == ISD::SCALAR_TO_VECTOR &&
isa<LoadSDNode>(Op1.getOperand(0))) {
LoadSDNode *LD = cast<LoadSDNode>(Op1.getOperand(0));
SDValue Base, Offset;
if (LD->isUnindexed() &&
SelectAddrIdxOnly(LD->getBasePtr(), Base, Offset)) {
SDValue Chain = LD->getChain();
SDValue Ops[] = { Base, Offset, Chain };
return CurDAG->SelectNodeTo(N, PPC::LXVDSX,
N->getValueType(0), Ops);
}
}
SDValue Ops[] = { Op1, Op2, DMV };
return CurDAG->SelectNodeTo(N, PPC::XXPERMDI, N->getValueType(0), Ops);
}
break;
case PPCISD::BDNZ:
case PPCISD::BDZ: {
bool IsPPC64 = PPCSubTarget->isPPC64();
SDValue Ops[] = { N->getOperand(1), N->getOperand(0) };
return CurDAG->SelectNodeTo(N, N->getOpcode() == PPCISD::BDNZ ?
(IsPPC64 ? PPC::BDNZ8 : PPC::BDNZ) :
(IsPPC64 ? PPC::BDZ8 : PPC::BDZ),
MVT::Other, Ops);
}
case PPCISD::COND_BRANCH: {
// Op #0 is the Chain.
// Op #1 is the PPC::PRED_* number.
// Op #2 is the CR#
// Op #3 is the Dest MBB
// Op #4 is the Flag.
// Prevent PPC::PRED_* from being selected into LI.
SDValue Pred =
getI32Imm(cast<ConstantSDNode>(N->getOperand(1))->getZExtValue());
SDValue Ops[] = { Pred, N->getOperand(2), N->getOperand(3),
N->getOperand(0), N->getOperand(4) };
return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops);
}
case ISD::BR_CC: {
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
unsigned PCC = getPredicateForSetCC(CC);
if (N->getOperand(2).getValueType() == MVT::i1) {
unsigned Opc;
bool Swap;
switch (PCC) {
default: llvm_unreachable("Unexpected Boolean-operand predicate");
case PPC::PRED_LT: Opc = PPC::CRANDC; Swap = true; break;
case PPC::PRED_LE: Opc = PPC::CRORC; Swap = true; break;
case PPC::PRED_EQ: Opc = PPC::CREQV; Swap = false; break;
case PPC::PRED_GE: Opc = PPC::CRORC; Swap = false; break;
case PPC::PRED_GT: Opc = PPC::CRANDC; Swap = false; break;
case PPC::PRED_NE: Opc = PPC::CRXOR; Swap = false; break;
}
SDValue BitComp(CurDAG->getMachineNode(Opc, dl, MVT::i1,
N->getOperand(Swap ? 3 : 2),
N->getOperand(Swap ? 2 : 3)), 0);
return CurDAG->SelectNodeTo(N, PPC::BC, MVT::Other,
BitComp, N->getOperand(4), N->getOperand(0));
}
SDValue CondCode = SelectCC(N->getOperand(2), N->getOperand(3), CC, dl);
SDValue Ops[] = { getI32Imm(PCC), CondCode,
N->getOperand(4), N->getOperand(0) };
return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops);
}
case ISD::BRIND: {
// FIXME: Should custom lower this.
SDValue Chain = N->getOperand(0);
SDValue Target = N->getOperand(1);
unsigned Opc = Target.getValueType() == MVT::i32 ? PPC::MTCTR : PPC::MTCTR8;
unsigned Reg = Target.getValueType() == MVT::i32 ? PPC::BCTR : PPC::BCTR8;
Chain = SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Glue, Target,
Chain), 0);
return CurDAG->SelectNodeTo(N, Reg, MVT::Other, Chain);
}
case PPCISD::TOC_ENTRY: {
if (PPCSubTarget->isSVR4ABI() && !PPCSubTarget->isPPC64()) {
SDValue GA = N->getOperand(0);
return CurDAG->getMachineNode(PPC::LWZtoc, dl, MVT::i32, GA,
N->getOperand(1));
}
assert (PPCSubTarget->isPPC64() &&
"Only supported for 64-bit ABI and 32-bit SVR4");
// For medium and large code model, we generate two instructions as
// described below. Otherwise we allow SelectCodeCommon to handle this,
// selecting one of LDtoc, LDtocJTI, and LDtocCPT.
CodeModel::Model CModel = TM.getCodeModel();
if (CModel != CodeModel::Medium && CModel != CodeModel::Large)
break;
// The first source operand is a TargetGlobalAddress or a TargetJumpTable.
// If it is an externally defined symbol, a symbol with common linkage,
// a non-local function address, or a jump table address, or if we are
// generating code for large code model, we generate:
// LDtocL(<ga:@sym>, ADDIStocHA(%X2, <ga:@sym>))
// Otherwise we generate:
// ADDItocL(ADDIStocHA(%X2, <ga:@sym>), <ga:@sym>)
SDValue GA = N->getOperand(0);
SDValue TOCbase = N->getOperand(1);
SDNode *Tmp = CurDAG->getMachineNode(PPC::ADDIStocHA, dl, MVT::i64,
TOCbase, GA);
if (isa<JumpTableSDNode>(GA) || CModel == CodeModel::Large)
return CurDAG->getMachineNode(PPC::LDtocL, dl, MVT::i64, GA,
SDValue(Tmp, 0));
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(GA)) {
const GlobalValue *GValue = G->getGlobal();
if ((GValue->getType()->getElementType()->isFunctionTy() &&
(GValue->isDeclaration() || GValue->isWeakForLinker())) ||
GValue->isDeclaration() || GValue->hasCommonLinkage() ||
GValue->hasAvailableExternallyLinkage())
return CurDAG->getMachineNode(PPC::LDtocL, dl, MVT::i64, GA,
SDValue(Tmp, 0));
}
return CurDAG->getMachineNode(PPC::ADDItocL, dl, MVT::i64,
SDValue(Tmp, 0), GA);
}
case PPCISD::PPC32_PICGOT: {
// Generate a PIC-safe GOT reference.
assert(!PPCSubTarget->isPPC64() && PPCSubTarget->isSVR4ABI() &&
"PPCISD::PPC32_PICGOT is only supported for 32-bit SVR4");
return CurDAG->SelectNodeTo(N, PPC::PPC32PICGOT, PPCLowering->getPointerTy(), MVT::i32);
}
case PPCISD::VADD_SPLAT: {
// This expands into one of three sequences, depending on whether
// the first operand is odd or even, positive or negative.
assert(isa<ConstantSDNode>(N->getOperand(0)) &&
isa<ConstantSDNode>(N->getOperand(1)) &&
"Invalid operand on VADD_SPLAT!");
int Elt = N->getConstantOperandVal(0);
int EltSize = N->getConstantOperandVal(1);
unsigned Opc1, Opc2, Opc3;
EVT VT;
if (EltSize == 1) {
Opc1 = PPC::VSPLTISB;
Opc2 = PPC::VADDUBM;
Opc3 = PPC::VSUBUBM;
VT = MVT::v16i8;
} else if (EltSize == 2) {
Opc1 = PPC::VSPLTISH;
Opc2 = PPC::VADDUHM;
Opc3 = PPC::VSUBUHM;
VT = MVT::v8i16;
} else {
assert(EltSize == 4 && "Invalid element size on VADD_SPLAT!");
Opc1 = PPC::VSPLTISW;
Opc2 = PPC::VADDUWM;
Opc3 = PPC::VSUBUWM;
VT = MVT::v4i32;
}
if ((Elt & 1) == 0) {
// Elt is even, in the range [-32,-18] + [16,30].
//
// Convert: VADD_SPLAT elt, size
// Into: tmp = VSPLTIS[BHW] elt
// VADDU[BHW]M tmp, tmp
// Where: [BHW] = B for size = 1, H for size = 2, W for size = 4
SDValue EltVal = getI32Imm(Elt >> 1);
SDNode *Tmp = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
SDValue TmpVal = SDValue(Tmp, 0);
return CurDAG->getMachineNode(Opc2, dl, VT, TmpVal, TmpVal);
} else if (Elt > 0) {
// Elt is odd and positive, in the range [17,31].
//
// Convert: VADD_SPLAT elt, size
// Into: tmp1 = VSPLTIS[BHW] elt-16
// tmp2 = VSPLTIS[BHW] -16
// VSUBU[BHW]M tmp1, tmp2
SDValue EltVal = getI32Imm(Elt - 16);
SDNode *Tmp1 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
EltVal = getI32Imm(-16);
SDNode *Tmp2 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
return CurDAG->getMachineNode(Opc3, dl, VT, SDValue(Tmp1, 0),
SDValue(Tmp2, 0));
} else {
// Elt is odd and negative, in the range [-31,-17].
//
// Convert: VADD_SPLAT elt, size
// Into: tmp1 = VSPLTIS[BHW] elt+16
// tmp2 = VSPLTIS[BHW] -16
// VADDU[BHW]M tmp1, tmp2
SDValue EltVal = getI32Imm(Elt + 16);
SDNode *Tmp1 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
EltVal = getI32Imm(-16);
SDNode *Tmp2 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
return CurDAG->getMachineNode(Opc2, dl, VT, SDValue(Tmp1, 0),
SDValue(Tmp2, 0));
}
}
}
return SelectCode(N);
}
/// PostprocessISelDAG - Perform some late peephole optimizations
/// on the DAG representation.
void PPCDAGToDAGISel::PostprocessISelDAG() {
// Skip peepholes at -O0.
if (TM.getOptLevel() == CodeGenOpt::None)
return;
PeepholePPC64();
PeepholeCROps();
}
// Check if all users of this node will become isel where the second operand
// is the constant zero. If this is so, and if we can negate the condition,
// then we can flip the true and false operands. This will allow the zero to
// be folded with the isel so that we don't need to materialize a register
// containing zero.
bool PPCDAGToDAGISel::AllUsersSelectZero(SDNode *N) {
// If we're not using isel, then this does not matter.
if (!PPCSubTarget->hasISEL())
return false;
for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
UI != UE; ++UI) {
SDNode *User = *UI;
if (!User->isMachineOpcode())
return false;
if (User->getMachineOpcode() != PPC::SELECT_I4 &&
User->getMachineOpcode() != PPC::SELECT_I8)
return false;
SDNode *Op2 = User->getOperand(2).getNode();
if (!Op2->isMachineOpcode())
return false;
if (Op2->getMachineOpcode() != PPC::LI &&
Op2->getMachineOpcode() != PPC::LI8)
return false;
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op2->getOperand(0));
if (!C)
return false;
if (!C->isNullValue())
return false;
}
return true;
}
void PPCDAGToDAGISel::SwapAllSelectUsers(SDNode *N) {
SmallVector<SDNode *, 4> ToReplace;
for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
UI != UE; ++UI) {
SDNode *User = *UI;
assert((User->getMachineOpcode() == PPC::SELECT_I4 ||
User->getMachineOpcode() == PPC::SELECT_I8) &&
"Must have all select users");
ToReplace.push_back(User);
}
for (SmallVector<SDNode *, 4>::iterator UI = ToReplace.begin(),
UE = ToReplace.end(); UI != UE; ++UI) {
SDNode *User = *UI;
SDNode *ResNode =
CurDAG->getMachineNode(User->getMachineOpcode(), SDLoc(User),
User->getValueType(0), User->getOperand(0),
User->getOperand(2),
User->getOperand(1));
DEBUG(dbgs() << "CR Peephole replacing:\nOld: ");
DEBUG(User->dump(CurDAG));
DEBUG(dbgs() << "\nNew: ");
DEBUG(ResNode->dump(CurDAG));
DEBUG(dbgs() << "\n");
ReplaceUses(User, ResNode);
}
}
void PPCDAGToDAGISel::PeepholeCROps() {
bool IsModified;
do {
IsModified = false;
for (SelectionDAG::allnodes_iterator I = CurDAG->allnodes_begin(),
E = CurDAG->allnodes_end(); I != E; ++I) {
MachineSDNode *MachineNode = dyn_cast<MachineSDNode>(I);
if (!MachineNode || MachineNode->use_empty())
continue;
SDNode *ResNode = MachineNode;
bool Op1Set = false, Op1Unset = false,
Op1Not = false,
Op2Set = false, Op2Unset = false,
Op2Not = false;
unsigned Opcode = MachineNode->getMachineOpcode();
switch (Opcode) {
default: break;
case PPC::CRAND:
case PPC::CRNAND:
case PPC::CROR:
case PPC::CRXOR:
case PPC::CRNOR:
case PPC::CREQV:
case PPC::CRANDC:
case PPC::CRORC: {
SDValue Op = MachineNode->getOperand(1);
if (Op.isMachineOpcode()) {
if (Op.getMachineOpcode() == PPC::CRSET)
Op2Set = true;
else if (Op.getMachineOpcode() == PPC::CRUNSET)
Op2Unset = true;
else if (Op.getMachineOpcode() == PPC::CRNOR &&
Op.getOperand(0) == Op.getOperand(1))
Op2Not = true;
}
} // fallthrough
case PPC::BC:
case PPC::BCn:
case PPC::SELECT_I4:
case PPC::SELECT_I8:
case PPC::SELECT_F4:
case PPC::SELECT_F8:
case PPC::SELECT_VRRC: {
SDValue Op = MachineNode->getOperand(0);
if (Op.isMachineOpcode()) {
if (Op.getMachineOpcode() == PPC::CRSET)
Op1Set = true;
else if (Op.getMachineOpcode() == PPC::CRUNSET)
Op1Unset = true;
else if (Op.getMachineOpcode() == PPC::CRNOR &&
Op.getOperand(0) == Op.getOperand(1))
Op1Not = true;
}
}
break;
}
bool SelectSwap = false;
switch (Opcode) {
default: break;
case PPC::CRAND:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
// x & x = x
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Set)
// 1 & y = y
ResNode = MachineNode->getOperand(1).getNode();
else if (Op2Set)
// x & 1 = x
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Unset || Op2Unset)
// x & 0 = 0 & y = 0
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Not)
// ~x & y = andc(y, x)
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(0).
getOperand(0));
else if (Op2Not)
// x & ~y = andc(x, y)
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRNAND, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CRNAND:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
// nand(x, x) -> nor(x, x)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Set)
// nand(1, y) -> nor(y, y)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op2Set)
// nand(x, 1) -> nor(x, x)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Unset || Op2Unset)
// nand(x, 0) = nand(0, y) = 1
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Not)
// nand(~x, y) = ~(~x & y) = x | ~y = orc(x, y)
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
// nand(x, ~y) = ~x | y = orc(y, x)
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1).
getOperand(0),
MachineNode->getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRAND, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CROR:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
// x | x = x
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Set || Op2Set)
// x | 1 = 1 | y = 1
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Unset)
// 0 | y = y
ResNode = MachineNode->getOperand(1).getNode();
else if (Op2Unset)
// x | 0 = x
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Not)
// ~x | y = orc(y, x)
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(0).
getOperand(0));
else if (Op2Not)
// x | ~y = orc(x, y)
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CRXOR:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
// xor(x, x) = 0
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Set)
// xor(1, y) -> nor(y, y)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op2Set)
// xor(x, 1) -> nor(x, x)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Unset)
// xor(0, y) = y
ResNode = MachineNode->getOperand(1).getNode();
else if (Op2Unset)
// xor(x, 0) = x
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Not)
// xor(~x, y) = eqv(x, y)
ResNode = CurDAG->getMachineNode(PPC::CREQV, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
// xor(x, ~y) = eqv(x, y)
ResNode = CurDAG->getMachineNode(PPC::CREQV, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CREQV, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CRNOR:
if (Op1Set || Op2Set)
// nor(1, y) -> 0
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Unset)
// nor(0, y) = ~y -> nor(y, y)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op2Unset)
// nor(x, 0) = ~x
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Not)
// nor(~x, y) = andc(x, y)
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
// nor(x, ~y) = andc(y, x)
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1).
getOperand(0),
MachineNode->getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CROR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CREQV:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
// eqv(x, x) = 1
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Set)
// eqv(1, y) = y
ResNode = MachineNode->getOperand(1).getNode();
else if (Op2Set)
// eqv(x, 1) = x
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Unset)
// eqv(0, y) = ~y -> nor(y, y)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op2Unset)
// eqv(x, 0) = ~x
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Not)
// eqv(~x, y) = xor(x, y)
ResNode = CurDAG->getMachineNode(PPC::CRXOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
// eqv(x, ~y) = xor(x, y)
ResNode = CurDAG->getMachineNode(PPC::CRXOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRXOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CRANDC:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
// andc(x, x) = 0
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Set)
// andc(1, y) = ~y
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op1Unset || Op2Set)
// andc(0, y) = andc(x, 1) = 0
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op2Unset)
// andc(x, 0) = x
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Not)
// andc(~x, y) = ~(x | y) = nor(x, y)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
// andc(x, ~y) = x & y
ResNode = CurDAG->getMachineNode(PPC::CRAND, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(0)),
SelectSwap = true;
break;
case PPC::CRORC:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
// orc(x, x) = 1
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Set || Op2Unset)
// orc(1, y) = orc(x, 0) = 1
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op2Set)
// orc(x, 1) = x
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Unset)
// orc(0, y) = ~y
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op1Not)
// orc(~x, y) = ~(x & y) = nand(x, y)
ResNode = CurDAG->getMachineNode(PPC::CRNAND, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
// orc(x, ~y) = x | y
ResNode = CurDAG->getMachineNode(PPC::CROR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(0)),
SelectSwap = true;
break;
case PPC::SELECT_I4:
case PPC::SELECT_I8:
case PPC::SELECT_F4:
case PPC::SELECT_F8:
case PPC::SELECT_VRRC:
if (Op1Set)
ResNode = MachineNode->getOperand(1).getNode();
else if (Op1Unset)
ResNode = MachineNode->getOperand(2).getNode();
else if (Op1Not)
ResNode = CurDAG->getMachineNode(MachineNode->getMachineOpcode(),
SDLoc(MachineNode),
MachineNode->getValueType(0),
MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(2),
MachineNode->getOperand(1));
break;
case PPC::BC:
case PPC::BCn:
if (Op1Not)
ResNode = CurDAG->getMachineNode(Opcode == PPC::BC ? PPC::BCn :
PPC::BC,
SDLoc(MachineNode),
MVT::Other,
MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1),
MachineNode->getOperand(2));
// FIXME: Handle Op1Set, Op1Unset here too.
break;
}
// If we're inverting this node because it is used only by selects that
// we'd like to swap, then swap the selects before the node replacement.
if (SelectSwap)
SwapAllSelectUsers(MachineNode);
if (ResNode != MachineNode) {
DEBUG(dbgs() << "CR Peephole replacing:\nOld: ");
DEBUG(MachineNode->dump(CurDAG));
DEBUG(dbgs() << "\nNew: ");
DEBUG(ResNode->dump(CurDAG));
DEBUG(dbgs() << "\n");
ReplaceUses(MachineNode, ResNode);
IsModified = true;
}
}
if (IsModified)
CurDAG->RemoveDeadNodes();
} while (IsModified);
}
void PPCDAGToDAGISel::PeepholePPC64() {
// These optimizations are currently supported only for 64-bit SVR4.
if (PPCSubTarget->isDarwin() || !PPCSubTarget->isPPC64())
return;
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
++Position;
while (Position != CurDAG->allnodes_begin()) {
SDNode *N = --Position;
// Skip dead nodes and any non-machine opcodes.
if (N->use_empty() || !N->isMachineOpcode())
continue;
unsigned FirstOp;
unsigned StorageOpcode = N->getMachineOpcode();
switch (StorageOpcode) {
default: continue;
case PPC::LBZ:
case PPC::LBZ8:
case PPC::LD:
case PPC::LFD:
case PPC::LFS:
case PPC::LHA:
case PPC::LHA8:
case PPC::LHZ:
case PPC::LHZ8:
case PPC::LWA:
case PPC::LWZ:
case PPC::LWZ8:
FirstOp = 0;
break;
case PPC::STB:
case PPC::STB8:
case PPC::STD:
case PPC::STFD:
case PPC::STFS:
case PPC::STH:
case PPC::STH8:
case PPC::STW:
case PPC::STW8:
FirstOp = 1;
break;
}
// If this is a load or store with a zero offset, we may be able to
// fold an add-immediate into the memory operation.
if (!isa<ConstantSDNode>(N->getOperand(FirstOp)) ||
N->getConstantOperandVal(FirstOp) != 0)
continue;
SDValue Base = N->getOperand(FirstOp + 1);
if (!Base.isMachineOpcode())
continue;
unsigned Flags = 0;
bool ReplaceFlags = true;
// When the feeding operation is an add-immediate of some sort,
// determine whether we need to add relocation information to the
// target flags on the immediate operand when we fold it into the
// load instruction.
//
// For something like ADDItocL, the relocation information is
// inferred from the opcode; when we process it in the AsmPrinter,
// we add the necessary relocation there. A load, though, can receive
// relocation from various flavors of ADDIxxx, so we need to carry
// the relocation information in the target flags.
switch (Base.getMachineOpcode()) {
default: continue;
case PPC::ADDI8:
case PPC::ADDI:
// In some cases (such as TLS) the relocation information
// is already in place on the operand, so copying the operand
// is sufficient.
ReplaceFlags = false;
// For these cases, the immediate may not be divisible by 4, in
// which case the fold is illegal for DS-form instructions. (The
// other cases provide aligned addresses and are always safe.)
if ((StorageOpcode == PPC::LWA ||
StorageOpcode == PPC::LD ||
StorageOpcode == PPC::STD) &&
(!isa<ConstantSDNode>(Base.getOperand(1)) ||
Base.getConstantOperandVal(1) % 4 != 0))
continue;
break;
case PPC::ADDIdtprelL:
Flags = PPCII::MO_DTPREL_LO;
break;
case PPC::ADDItlsldL:
Flags = PPCII::MO_TLSLD_LO;
break;
case PPC::ADDItocL:
Flags = PPCII::MO_TOC_LO;
break;
}
// We found an opportunity. Reverse the operands from the add
// immediate and substitute them into the load or store. If
// needed, update the target flags for the immediate operand to
// reflect the necessary relocation information.
DEBUG(dbgs() << "Folding add-immediate into mem-op:\nBase: ");
DEBUG(Base->dump(CurDAG));
DEBUG(dbgs() << "\nN: ");
DEBUG(N->dump(CurDAG));
DEBUG(dbgs() << "\n");
SDValue ImmOpnd = Base.getOperand(1);
// If the relocation information isn't already present on the
// immediate operand, add it now.
if (ReplaceFlags) {
if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(ImmOpnd)) {
SDLoc dl(GA);
const GlobalValue *GV = GA->getGlobal();
// We can't perform this optimization for data whose alignment
// is insufficient for the instruction encoding.
if (GV->getAlignment() < 4 &&
(StorageOpcode == PPC::LD || StorageOpcode == PPC::STD ||
StorageOpcode == PPC::LWA)) {
DEBUG(dbgs() << "Rejected this candidate for alignment.\n\n");
continue;
}
ImmOpnd = CurDAG->getTargetGlobalAddress(GV, dl, MVT::i64, 0, Flags);
} else if (ConstantPoolSDNode *CP =
dyn_cast<ConstantPoolSDNode>(ImmOpnd)) {
const Constant *C = CP->getConstVal();
ImmOpnd = CurDAG->getTargetConstantPool(C, MVT::i64,
CP->getAlignment(),
0, Flags);
}
}
if (FirstOp == 1) // Store
(void)CurDAG->UpdateNodeOperands(N, N->getOperand(0), ImmOpnd,
Base.getOperand(0), N->getOperand(3));
else // Load
(void)CurDAG->UpdateNodeOperands(N, ImmOpnd, Base.getOperand(0),
N->getOperand(2));
// The add-immediate may now be dead, in which case remove it.
if (Base.getNode()->use_empty())
CurDAG->RemoveDeadNode(Base.getNode());
}
}
/// createPPCISelDag - This pass converts a legalized DAG into a
/// PowerPC-specific DAG, ready for instruction scheduling.
///
FunctionPass *llvm::createPPCISelDag(PPCTargetMachine &TM) {
return new PPCDAGToDAGISel(TM);
}
static void initializePassOnce(PassRegistry &Registry) {
const char *Name = "PowerPC DAG->DAG Pattern Instruction Selection";
PassInfo *PI = new PassInfo(Name, "ppc-codegen", &SelectionDAGISel::ID,
nullptr, false, false);
Registry.registerPass(*PI, true);
}
void llvm::initializePPCDAGToDAGISelPass(PassRegistry &Registry) {
CALL_ONCE_INITIALIZATION(initializePassOnce);
}
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