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llvm/lib/Target/Alpha/AlphaISelLowering.cpp
Bill Wendling ab58f13839 Remove dead variable. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92194 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-28 02:00:30 +00:00

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//===-- AlphaISelLowering.cpp - Alpha 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 AlphaISelLowering class.
//
//===----------------------------------------------------------------------===//
#include "AlphaISelLowering.h"
#include "AlphaTargetMachine.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/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/Module.h"
#include "llvm/Intrinsics.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
/// AddLiveIn - This helper function adds the specified physical register to the
/// MachineFunction as a live in value. It also creates a corresponding virtual
/// register for it.
static unsigned AddLiveIn(MachineFunction &MF, unsigned PReg,
TargetRegisterClass *RC) {
assert(RC->contains(PReg) && "Not the correct regclass!");
unsigned VReg = MF.getRegInfo().createVirtualRegister(RC);
MF.getRegInfo().addLiveIn(PReg, VReg);
return VReg;
}
AlphaTargetLowering::AlphaTargetLowering(TargetMachine &TM)
: TargetLowering(TM, new TargetLoweringObjectFileELF()) {
// Set up the TargetLowering object.
//I am having problems with shr n i8 1
setShiftAmountType(MVT::i64);
setBooleanContents(ZeroOrOneBooleanContent);
setUsesGlobalOffsetTable(true);
addRegisterClass(MVT::i64, Alpha::GPRCRegisterClass);
addRegisterClass(MVT::f64, Alpha::F8RCRegisterClass);
addRegisterClass(MVT::f32, Alpha::F4RCRegisterClass);
// We want to custom lower some of our intrinsics.
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
setLoadExtAction(ISD::ZEXTLOAD, MVT::i32, Expand);
setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand);
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
// setOperationAction(ISD::BRIND, MVT::Other, Expand);
setOperationAction(ISD::BR_JT, MVT::Other, Expand);
setOperationAction(ISD::BR_CC, MVT::Other, Expand);
setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
setOperationAction(ISD::FREM, MVT::f32, Expand);
setOperationAction(ISD::FREM, MVT::f64, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
if (!TM.getSubtarget<AlphaSubtarget>().hasCT()) {
setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
setOperationAction(ISD::CTLZ , MVT::i64 , Expand);
}
setOperationAction(ISD::BSWAP , MVT::i64, Expand);
setOperationAction(ISD::ROTL , MVT::i64, Expand);
setOperationAction(ISD::ROTR , MVT::i64, Expand);
setOperationAction(ISD::SREM , MVT::i64, Custom);
setOperationAction(ISD::UREM , MVT::i64, Custom);
setOperationAction(ISD::SDIV , MVT::i64, Custom);
setOperationAction(ISD::UDIV , MVT::i64, Custom);
setOperationAction(ISD::ADDC , MVT::i64, Expand);
setOperationAction(ISD::ADDE , MVT::i64, Expand);
setOperationAction(ISD::SUBC , MVT::i64, Expand);
setOperationAction(ISD::SUBE , MVT::i64, Expand);
setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
setOperationAction(ISD::SRA_PARTS, MVT::i64, Expand);
setOperationAction(ISD::SHL_PARTS, MVT::i64, Expand);
// We don't support sin/cos/sqrt/pow
setOperationAction(ISD::FSIN , MVT::f64, Expand);
setOperationAction(ISD::FCOS , MVT::f64, Expand);
setOperationAction(ISD::FSIN , MVT::f32, Expand);
setOperationAction(ISD::FCOS , MVT::f32, Expand);
setOperationAction(ISD::FSQRT, MVT::f64, Expand);
setOperationAction(ISD::FSQRT, MVT::f32, Expand);
setOperationAction(ISD::FPOW , MVT::f32, Expand);
setOperationAction(ISD::FPOW , MVT::f64, Expand);
setOperationAction(ISD::SETCC, MVT::f32, Promote);
setOperationAction(ISD::BIT_CONVERT, MVT::f32, Promote);
setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
// Not implemented yet.
setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
// We want to legalize GlobalAddress and ConstantPool and
// ExternalSymbols nodes into the appropriate instructions to
// materialize the address.
setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
setOperationAction(ISD::ExternalSymbol, MVT::i64, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
setOperationAction(ISD::VASTART, MVT::Other, Custom);
setOperationAction(ISD::VAEND, MVT::Other, Expand);
setOperationAction(ISD::VACOPY, MVT::Other, Custom);
setOperationAction(ISD::VAARG, MVT::Other, Custom);
setOperationAction(ISD::VAARG, MVT::i32, Custom);
setOperationAction(ISD::JumpTable, MVT::i64, Custom);
setOperationAction(ISD::JumpTable, MVT::i32, Custom);
setStackPointerRegisterToSaveRestore(Alpha::R30);
setJumpBufSize(272);
setJumpBufAlignment(16);
computeRegisterProperties();
}
MVT::SimpleValueType AlphaTargetLowering::getSetCCResultType(EVT VT) const {
return MVT::i64;
}
const char *AlphaTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return 0;
case AlphaISD::CVTQT_: return "Alpha::CVTQT_";
case AlphaISD::CVTQS_: return "Alpha::CVTQS_";
case AlphaISD::CVTTQ_: return "Alpha::CVTTQ_";
case AlphaISD::GPRelHi: return "Alpha::GPRelHi";
case AlphaISD::GPRelLo: return "Alpha::GPRelLo";
case AlphaISD::RelLit: return "Alpha::RelLit";
case AlphaISD::GlobalRetAddr: return "Alpha::GlobalRetAddr";
case AlphaISD::CALL: return "Alpha::CALL";
case AlphaISD::DivCall: return "Alpha::DivCall";
case AlphaISD::RET_FLAG: return "Alpha::RET_FLAG";
case AlphaISD::COND_BRANCH_I: return "Alpha::COND_BRANCH_I";
case AlphaISD::COND_BRANCH_F: return "Alpha::COND_BRANCH_F";
}
}
/// getFunctionAlignment - Return the Log2 alignment of this function.
unsigned AlphaTargetLowering::getFunctionAlignment(const Function *F) const {
return 4;
}
static SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) {
EVT PtrVT = Op.getValueType();
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
// FIXME there isn't really any debug info here
DebugLoc dl = Op.getDebugLoc();
SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, JTI,
DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, JTI, Hi);
return Lo;
}
//http://www.cs.arizona.edu/computer.help/policy/DIGITAL_unix/
//AA-PY8AC-TET1_html/callCH3.html#BLOCK21
//For now, just use variable size stack frame format
//In a standard call, the first six items are passed in registers $16
//- $21 and/or registers $f16 - $f21. (See Section 4.1.2 for details
//of argument-to-register correspondence.) The remaining items are
//collected in a memory argument list that is a naturally aligned
//array of quadwords. In a standard call, this list, if present, must
//be passed at 0(SP).
//7 ... n 0(SP) ... (n-7)*8(SP)
// //#define FP $15
// //#define RA $26
// //#define PV $27
// //#define GP $29
// //#define SP $30
#include "AlphaGenCallingConv.inc"
SDValue
AlphaTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
CallingConv::ID CallConv, bool isVarArg,
bool isTailCall,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) {
// Analyze operands of the call, assigning locations to each operand.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
ArgLocs, *DAG.getContext());
CCInfo.AnalyzeCallOperands(Outs, CC_Alpha);
// Get a count of how many bytes are to be pushed on the stack.
unsigned NumBytes = CCInfo.getNextStackOffset();
Chain = DAG.getCALLSEQ_START(Chain, DAG.getConstant(NumBytes,
getPointerTy(), true));
SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
SmallVector<SDValue, 12> MemOpChains;
SDValue StackPtr;
// Walk the register/memloc assignments, inserting copies/loads.
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
SDValue Arg = Outs[i].Val;
// Promote the value if needed.
switch (VA.getLocInfo()) {
default: assert(0 && "Unknown loc info!");
case CCValAssign::Full: break;
case CCValAssign::SExt:
Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
break;
case CCValAssign::ZExt:
Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
break;
case CCValAssign::AExt:
Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
break;
}
// Arguments that can be passed on register must be kept at RegsToPass
// vector
if (VA.isRegLoc()) {
RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
} else {
assert(VA.isMemLoc());
if (StackPtr.getNode() == 0)
StackPtr = DAG.getCopyFromReg(Chain, dl, Alpha::R30, MVT::i64);
SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
StackPtr,
DAG.getIntPtrConstant(VA.getLocMemOffset()));
MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
PseudoSourceValue::getStack(), 0));
}
}
// Transform all store nodes into one single node because all store nodes are
// independent of each other.
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 registers. The InFlag in
// necessary since all emited instructions must be stuck together.
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);
}
// Returns a chain & a flag for retval copy to use.
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
SmallVector<SDValue, 8> Ops;
Ops.push_back(Chain);
Ops.push_back(Callee);
// 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()));
if (InFlag.getNode())
Ops.push_back(InFlag);
Chain = DAG.getNode(AlphaISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
InFlag = Chain.getValue(1);
// Create the CALLSEQ_END node.
Chain = DAG.getCALLSEQ_END(Chain,
DAG.getConstant(NumBytes, getPointerTy(), true),
DAG.getConstant(0, getPointerTy(), true),
InFlag);
InFlag = Chain.getValue(1);
// Handle result values, copying them out of physregs into vregs that we
// return.
return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
Ins, dl, DAG, InVals);
}
/// LowerCallResult - Lower the result values of a call into the
/// appropriate copies out of appropriate physical registers.
///
SDValue
AlphaTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) {
// Assign locations to each value returned by this call.
SmallVector<CCValAssign, 16> RVLocs;
CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs,
*DAG.getContext());
CCInfo.AnalyzeCallResult(Ins, RetCC_Alpha);
// Copy all of the result registers out of their specified physreg.
for (unsigned i = 0; i != RVLocs.size(); ++i) {
CCValAssign &VA = RVLocs[i];
Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
VA.getLocVT(), InFlag).getValue(1);
SDValue RetValue = Chain.getValue(0);
InFlag = Chain.getValue(2);
// If this is an 8/16/32-bit value, it is really passed promoted to 64
// bits. Insert an assert[sz]ext to capture this, then truncate to the
// right size.
if (VA.getLocInfo() == CCValAssign::SExt)
RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue,
DAG.getValueType(VA.getValVT()));
else if (VA.getLocInfo() == CCValAssign::ZExt)
RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue,
DAG.getValueType(VA.getValVT()));
if (VA.getLocInfo() != CCValAssign::Full)
RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue);
InVals.push_back(RetValue);
}
return Chain;
}
SDValue
AlphaTargetLowering::LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg>
&Ins,
DebugLoc dl, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) {
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
unsigned args_int[] = {
Alpha::R16, Alpha::R17, Alpha::R18, Alpha::R19, Alpha::R20, Alpha::R21};
unsigned args_float[] = {
Alpha::F16, Alpha::F17, Alpha::F18, Alpha::F19, Alpha::F20, Alpha::F21};
for (unsigned ArgNo = 0, e = Ins.size(); ArgNo != e; ++ArgNo) {
SDValue argt;
EVT ObjectVT = Ins[ArgNo].VT;
SDValue ArgVal;
if (ArgNo < 6) {
switch (ObjectVT.getSimpleVT().SimpleTy) {
default:
assert(false && "Invalid value type!");
case MVT::f64:
args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
&Alpha::F8RCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
break;
case MVT::f32:
args_float[ArgNo] = AddLiveIn(MF, args_float[ArgNo],
&Alpha::F4RCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, args_float[ArgNo], ObjectVT);
break;
case MVT::i64:
args_int[ArgNo] = AddLiveIn(MF, args_int[ArgNo],
&Alpha::GPRCRegClass);
ArgVal = DAG.getCopyFromReg(Chain, dl, args_int[ArgNo], MVT::i64);
break;
}
} else { //more args
// Create the frame index object for this incoming parameter...
int FI = MFI->CreateFixedObject(8, 8 * (ArgNo - 6), true, false);
// Create the SelectionDAG nodes corresponding to a load
//from this parameter
SDValue FIN = DAG.getFrameIndex(FI, MVT::i64);
ArgVal = DAG.getLoad(ObjectVT, dl, Chain, FIN, NULL, 0);
}
InVals.push_back(ArgVal);
}
// If the functions takes variable number of arguments, copy all regs to stack
if (isVarArg) {
VarArgsOffset = Ins.size() * 8;
std::vector<SDValue> LS;
for (int i = 0; i < 6; ++i) {
if (TargetRegisterInfo::isPhysicalRegister(args_int[i]))
args_int[i] = AddLiveIn(MF, args_int[i], &Alpha::GPRCRegClass);
SDValue argt = DAG.getCopyFromReg(Chain, dl, args_int[i], MVT::i64);
int FI = MFI->CreateFixedObject(8, -8 * (6 - i), true, false);
if (i == 0) VarArgsBase = FI;
SDValue SDFI = DAG.getFrameIndex(FI, MVT::i64);
LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, NULL, 0));
if (TargetRegisterInfo::isPhysicalRegister(args_float[i]))
args_float[i] = AddLiveIn(MF, args_float[i], &Alpha::F8RCRegClass);
argt = DAG.getCopyFromReg(Chain, dl, args_float[i], MVT::f64);
FI = MFI->CreateFixedObject(8, - 8 * (12 - i), true, false);
SDFI = DAG.getFrameIndex(FI, MVT::i64);
LS.push_back(DAG.getStore(Chain, dl, argt, SDFI, NULL, 0));
}
//Set up a token factor with all the stack traffic
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &LS[0], LS.size());
}
return Chain;
}
SDValue
AlphaTargetLowering::LowerReturn(SDValue Chain,
CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
DebugLoc dl, SelectionDAG &DAG) {
SDValue Copy = DAG.getCopyToReg(Chain, dl, Alpha::R26,
DAG.getNode(AlphaISD::GlobalRetAddr,
DebugLoc::getUnknownLoc(),
MVT::i64),
SDValue());
switch (Outs.size()) {
default:
llvm_unreachable("Do not know how to return this many arguments!");
case 0:
break;
//return SDValue(); // ret void is legal
case 1: {
EVT ArgVT = Outs[0].Val.getValueType();
unsigned ArgReg;
if (ArgVT.isInteger())
ArgReg = Alpha::R0;
else {
assert(ArgVT.isFloatingPoint());
ArgReg = Alpha::F0;
}
Copy = DAG.getCopyToReg(Copy, dl, ArgReg,
Outs[0].Val, Copy.getValue(1));
if (DAG.getMachineFunction().getRegInfo().liveout_empty())
DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg);
break;
}
case 2: {
EVT ArgVT = Outs[0].Val.getValueType();
unsigned ArgReg1, ArgReg2;
if (ArgVT.isInteger()) {
ArgReg1 = Alpha::R0;
ArgReg2 = Alpha::R1;
} else {
assert(ArgVT.isFloatingPoint());
ArgReg1 = Alpha::F0;
ArgReg2 = Alpha::F1;
}
Copy = DAG.getCopyToReg(Copy, dl, ArgReg1,
Outs[0].Val, Copy.getValue(1));
if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg1)
== DAG.getMachineFunction().getRegInfo().liveout_end())
DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg1);
Copy = DAG.getCopyToReg(Copy, dl, ArgReg2,
Outs[1].Val, Copy.getValue(1));
if (std::find(DAG.getMachineFunction().getRegInfo().liveout_begin(),
DAG.getMachineFunction().getRegInfo().liveout_end(), ArgReg2)
== DAG.getMachineFunction().getRegInfo().liveout_end())
DAG.getMachineFunction().getRegInfo().addLiveOut(ArgReg2);
break;
}
}
return DAG.getNode(AlphaISD::RET_FLAG, dl,
MVT::Other, Copy, Copy.getValue(1));
}
void AlphaTargetLowering::LowerVAARG(SDNode *N, SDValue &Chain,
SDValue &DataPtr, SelectionDAG &DAG) {
Chain = N->getOperand(0);
SDValue VAListP = N->getOperand(1);
const Value *VAListS = cast<SrcValueSDNode>(N->getOperand(2))->getValue();
DebugLoc dl = N->getDebugLoc();
SDValue Base = DAG.getLoad(MVT::i64, dl, Chain, VAListP, VAListS, 0);
SDValue Tmp = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
DAG.getConstant(8, MVT::i64));
SDValue Offset = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Base.getValue(1),
Tmp, NULL, 0, MVT::i32);
DataPtr = DAG.getNode(ISD::ADD, dl, MVT::i64, Base, Offset);
if (N->getValueType(0).isFloatingPoint())
{
//if fp && Offset < 6*8, then subtract 6*8 from DataPtr
SDValue FPDataPtr = DAG.getNode(ISD::SUB, dl, MVT::i64, DataPtr,
DAG.getConstant(8*6, MVT::i64));
SDValue CC = DAG.getSetCC(dl, MVT::i64, Offset,
DAG.getConstant(8*6, MVT::i64), ISD::SETLT);
DataPtr = DAG.getNode(ISD::SELECT, dl, MVT::i64, CC, FPDataPtr, DataPtr);
}
SDValue NewOffset = DAG.getNode(ISD::ADD, dl, MVT::i64, Offset,
DAG.getConstant(8, MVT::i64));
Chain = DAG.getTruncStore(Offset.getValue(1), dl, NewOffset, Tmp, NULL, 0,
MVT::i32);
}
/// LowerOperation - Provide custom lowering hooks for some operations.
///
SDValue AlphaTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) {
DebugLoc dl = Op.getDebugLoc();
switch (Op.getOpcode()) {
default: llvm_unreachable("Wasn't expecting to be able to lower this!");
case ISD::JumpTable: return LowerJumpTable(Op, DAG);
case ISD::INTRINSIC_WO_CHAIN: {
unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
switch (IntNo) {
default: break; // Don't custom lower most intrinsics.
case Intrinsic::alpha_umulh:
return DAG.getNode(ISD::MULHU, dl, MVT::i64,
Op.getOperand(1), Op.getOperand(2));
}
}
case ISD::SRL_PARTS: {
SDValue ShOpLo = Op.getOperand(0);
SDValue ShOpHi = Op.getOperand(1);
SDValue ShAmt = Op.getOperand(2);
SDValue bm = DAG.getNode(ISD::SUB, dl, MVT::i64,
DAG.getConstant(64, MVT::i64), ShAmt);
SDValue BMCC = DAG.getSetCC(dl, MVT::i64, bm,
DAG.getConstant(0, MVT::i64), ISD::SETLE);
// if 64 - shAmt <= 0
SDValue Hi_Neg = DAG.getConstant(0, MVT::i64);
SDValue ShAmt_Neg = DAG.getNode(ISD::SUB, dl, MVT::i64,
DAG.getConstant(0, MVT::i64), bm);
SDValue Lo_Neg = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt_Neg);
// else
SDValue carries = DAG.getNode(ISD::SHL, dl, MVT::i64, ShOpHi, bm);
SDValue Hi_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpHi, ShAmt);
SDValue Lo_Pos = DAG.getNode(ISD::SRL, dl, MVT::i64, ShOpLo, ShAmt);
Lo_Pos = DAG.getNode(ISD::OR, dl, MVT::i64, Lo_Pos, carries);
// Merge
SDValue Hi = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Hi_Neg, Hi_Pos);
SDValue Lo = DAG.getNode(ISD::SELECT, dl, MVT::i64, BMCC, Lo_Neg, Lo_Pos);
SDValue Ops[2] = { Lo, Hi };
return DAG.getMergeValues(Ops, 2, dl);
}
// case ISD::SRA_PARTS:
// case ISD::SHL_PARTS:
case ISD::SINT_TO_FP: {
assert(Op.getOperand(0).getValueType() == MVT::i64 &&
"Unhandled SINT_TO_FP type in custom expander!");
SDValue LD;
bool isDouble = Op.getValueType() == MVT::f64;
LD = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op.getOperand(0));
SDValue FP = DAG.getNode(isDouble?AlphaISD::CVTQT_:AlphaISD::CVTQS_, dl,
isDouble?MVT::f64:MVT::f32, LD);
return FP;
}
case ISD::FP_TO_SINT: {
bool isDouble = Op.getOperand(0).getValueType() == MVT::f64;
SDValue src = Op.getOperand(0);
if (!isDouble) //Promote
src = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f64, src);
src = DAG.getNode(AlphaISD::CVTTQ_, dl, MVT::f64, src);
return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i64, src);
}
case ISD::ConstantPool: {
ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
Constant *C = CP->getConstVal();
SDValue CPI = DAG.getTargetConstantPool(C, MVT::i64, CP->getAlignment());
// FIXME there isn't really any debug info here
SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, CPI,
DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, CPI, Hi);
return Lo;
}
case ISD::GlobalTLSAddress:
llvm_unreachable("TLS not implemented for Alpha.");
case ISD::GlobalAddress: {
GlobalAddressSDNode *GSDN = cast<GlobalAddressSDNode>(Op);
GlobalValue *GV = GSDN->getGlobal();
SDValue GA = DAG.getTargetGlobalAddress(GV, MVT::i64, GSDN->getOffset());
// FIXME there isn't really any debug info here
// if (!GV->hasWeakLinkage() && !GV->isDeclaration() && !GV->hasLinkOnceLinkage()) {
if (GV->hasLocalLinkage()) {
SDValue Hi = DAG.getNode(AlphaISD::GPRelHi, dl, MVT::i64, GA,
DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
SDValue Lo = DAG.getNode(AlphaISD::GPRelLo, dl, MVT::i64, GA, Hi);
return Lo;
} else
return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64, GA,
DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
}
case ISD::ExternalSymbol: {
return DAG.getNode(AlphaISD::RelLit, dl, MVT::i64,
DAG.getTargetExternalSymbol(cast<ExternalSymbolSDNode>(Op)
->getSymbol(), MVT::i64),
DAG.getGLOBAL_OFFSET_TABLE(MVT::i64));
}
case ISD::UREM:
case ISD::SREM:
//Expand only on constant case
if (Op.getOperand(1).getOpcode() == ISD::Constant) {
EVT VT = Op.getNode()->getValueType(0);
SDValue Tmp1 = Op.getNode()->getOpcode() == ISD::UREM ?
BuildUDIV(Op.getNode(), DAG, NULL) :
BuildSDIV(Op.getNode(), DAG, NULL);
Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Op.getOperand(1));
Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Op.getOperand(0), Tmp1);
return Tmp1;
}
//fall through
case ISD::SDIV:
case ISD::UDIV:
if (Op.getValueType().isInteger()) {
if (Op.getOperand(1).getOpcode() == ISD::Constant)
return Op.getOpcode() == ISD::SDIV ? BuildSDIV(Op.getNode(), DAG, NULL)
: BuildUDIV(Op.getNode(), DAG, NULL);
const char* opstr = 0;
switch (Op.getOpcode()) {
case ISD::UREM: opstr = "__remqu"; break;
case ISD::SREM: opstr = "__remq"; break;
case ISD::UDIV: opstr = "__divqu"; break;
case ISD::SDIV: opstr = "__divq"; break;
}
SDValue Tmp1 = Op.getOperand(0),
Tmp2 = Op.getOperand(1),
Addr = DAG.getExternalSymbol(opstr, MVT::i64);
return DAG.getNode(AlphaISD::DivCall, dl, MVT::i64, Addr, Tmp1, Tmp2);
}
break;
case ISD::VAARG: {
SDValue Chain, DataPtr;
LowerVAARG(Op.getNode(), Chain, DataPtr, DAG);
SDValue Result;
if (Op.getValueType() == MVT::i32)
Result = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Chain, DataPtr,
NULL, 0, MVT::i32);
else
Result = DAG.getLoad(Op.getValueType(), dl, Chain, DataPtr, NULL, 0);
return Result;
}
case ISD::VACOPY: {
SDValue Chain = Op.getOperand(0);
SDValue DestP = Op.getOperand(1);
SDValue SrcP = Op.getOperand(2);
const Value *DestS = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
const Value *SrcS = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
SDValue Val = DAG.getLoad(getPointerTy(), dl, Chain, SrcP, SrcS, 0);
SDValue Result = DAG.getStore(Val.getValue(1), dl, Val, DestP, DestS, 0);
SDValue NP = DAG.getNode(ISD::ADD, dl, MVT::i64, SrcP,
DAG.getConstant(8, MVT::i64));
Val = DAG.getExtLoad(ISD::SEXTLOAD, dl, MVT::i64, Result,
NP, NULL,0, MVT::i32);
SDValue NPD = DAG.getNode(ISD::ADD, dl, MVT::i64, DestP,
DAG.getConstant(8, MVT::i64));
return DAG.getTruncStore(Val.getValue(1), dl, Val, NPD, NULL, 0, MVT::i32);
}
case ISD::VASTART: {
SDValue Chain = Op.getOperand(0);
SDValue VAListP = Op.getOperand(1);
const Value *VAListS = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
// vastart stores the address of the VarArgsBase and VarArgsOffset
SDValue FR = DAG.getFrameIndex(VarArgsBase, MVT::i64);
SDValue S1 = DAG.getStore(Chain, dl, FR, VAListP, VAListS, 0);
SDValue SA2 = DAG.getNode(ISD::ADD, dl, MVT::i64, VAListP,
DAG.getConstant(8, MVT::i64));
return DAG.getTruncStore(S1, dl, DAG.getConstant(VarArgsOffset, MVT::i64),
SA2, NULL, 0, MVT::i32);
}
case ISD::RETURNADDR:
return DAG.getNode(AlphaISD::GlobalRetAddr, DebugLoc::getUnknownLoc(),
MVT::i64);
//FIXME: implement
case ISD::FRAMEADDR: break;
}
return SDValue();
}
void AlphaTargetLowering::ReplaceNodeResults(SDNode *N,
SmallVectorImpl<SDValue>&Results,
SelectionDAG &DAG) {
DebugLoc dl = N->getDebugLoc();
assert(N->getValueType(0) == MVT::i32 &&
N->getOpcode() == ISD::VAARG &&
"Unknown node to custom promote!");
SDValue Chain, DataPtr;
LowerVAARG(N, Chain, DataPtr, DAG);
SDValue Res = DAG.getLoad(N->getValueType(0), dl, Chain, DataPtr, NULL, 0);
Results.push_back(Res);
Results.push_back(SDValue(Res.getNode(), 1));
}
//Inline Asm
/// getConstraintType - Given a constraint letter, return the type of
/// constraint it is for this target.
AlphaTargetLowering::ConstraintType
AlphaTargetLowering::getConstraintType(const std::string &Constraint) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
default: break;
case 'f':
case 'r':
return C_RegisterClass;
}
}
return TargetLowering::getConstraintType(Constraint);
}
std::vector<unsigned> AlphaTargetLowering::
getRegClassForInlineAsmConstraint(const std::string &Constraint,
EVT VT) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
default: break; // Unknown constriant letter
case 'f':
return make_vector<unsigned>(Alpha::F0 , Alpha::F1 , Alpha::F2 ,
Alpha::F3 , Alpha::F4 , Alpha::F5 ,
Alpha::F6 , Alpha::F7 , Alpha::F8 ,
Alpha::F9 , Alpha::F10, Alpha::F11,
Alpha::F12, Alpha::F13, Alpha::F14,
Alpha::F15, Alpha::F16, Alpha::F17,
Alpha::F18, Alpha::F19, Alpha::F20,
Alpha::F21, Alpha::F22, Alpha::F23,
Alpha::F24, Alpha::F25, Alpha::F26,
Alpha::F27, Alpha::F28, Alpha::F29,
Alpha::F30, Alpha::F31, 0);
case 'r':
return make_vector<unsigned>(Alpha::R0 , Alpha::R1 , Alpha::R2 ,
Alpha::R3 , Alpha::R4 , Alpha::R5 ,
Alpha::R6 , Alpha::R7 , Alpha::R8 ,
Alpha::R9 , Alpha::R10, Alpha::R11,
Alpha::R12, Alpha::R13, Alpha::R14,
Alpha::R15, Alpha::R16, Alpha::R17,
Alpha::R18, Alpha::R19, Alpha::R20,
Alpha::R21, Alpha::R22, Alpha::R23,
Alpha::R24, Alpha::R25, Alpha::R26,
Alpha::R27, Alpha::R28, Alpha::R29,
Alpha::R30, Alpha::R31, 0);
}
}
return std::vector<unsigned>();
}
//===----------------------------------------------------------------------===//
// Other Lowering Code
//===----------------------------------------------------------------------===//
MachineBasicBlock *
AlphaTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB,
DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const {
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
assert((MI->getOpcode() == Alpha::CAS32 ||
MI->getOpcode() == Alpha::CAS64 ||
MI->getOpcode() == Alpha::LAS32 ||
MI->getOpcode() == Alpha::LAS64 ||
MI->getOpcode() == Alpha::SWAP32 ||
MI->getOpcode() == Alpha::SWAP64) &&
"Unexpected instr type to insert");
bool is32 = MI->getOpcode() == Alpha::CAS32 ||
MI->getOpcode() == Alpha::LAS32 ||
MI->getOpcode() == Alpha::SWAP32;
//Load locked store conditional for atomic ops take on the same form
//start:
//ll
//do stuff (maybe branch to exit)
//sc
//test sc and maybe branck to start
//exit:
const BasicBlock *LLVM_BB = BB->getBasicBlock();
DebugLoc dl = MI->getDebugLoc();
MachineFunction::iterator It = BB;
++It;
MachineBasicBlock *thisMBB = BB;
MachineFunction *F = BB->getParent();
MachineBasicBlock *llscMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
// Inform sdisel of the edge changes.
for (MachineBasicBlock::succ_iterator I = BB->succ_begin(),
E = BB->succ_end(); I != E; ++I)
EM->insert(std::make_pair(*I, sinkMBB));
sinkMBB->transferSuccessors(thisMBB);
F->insert(It, llscMBB);
F->insert(It, sinkMBB);
BuildMI(thisMBB, dl, TII->get(Alpha::BR)).addMBB(llscMBB);
unsigned reg_res = MI->getOperand(0).getReg(),
reg_ptr = MI->getOperand(1).getReg(),
reg_v2 = MI->getOperand(2).getReg(),
reg_store = F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::LDL_L : Alpha::LDQ_L),
reg_res).addImm(0).addReg(reg_ptr);
switch (MI->getOpcode()) {
case Alpha::CAS32:
case Alpha::CAS64: {
unsigned reg_cmp
= F->getRegInfo().createVirtualRegister(&Alpha::GPRCRegClass);
BuildMI(llscMBB, dl, TII->get(Alpha::CMPEQ), reg_cmp)
.addReg(reg_v2).addReg(reg_res);
BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
.addImm(0).addReg(reg_cmp).addMBB(sinkMBB);
BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
.addReg(Alpha::R31).addReg(MI->getOperand(3).getReg());
break;
}
case Alpha::LAS32:
case Alpha::LAS64: {
BuildMI(llscMBB, dl,TII->get(is32 ? Alpha::ADDLr : Alpha::ADDQr), reg_store)
.addReg(reg_res).addReg(reg_v2);
break;
}
case Alpha::SWAP32:
case Alpha::SWAP64: {
BuildMI(llscMBB, dl, TII->get(Alpha::BISr), reg_store)
.addReg(reg_v2).addReg(reg_v2);
break;
}
}
BuildMI(llscMBB, dl, TII->get(is32 ? Alpha::STL_C : Alpha::STQ_C), reg_store)
.addReg(reg_store).addImm(0).addReg(reg_ptr);
BuildMI(llscMBB, dl, TII->get(Alpha::BEQ))
.addImm(0).addReg(reg_store).addMBB(llscMBB);
BuildMI(llscMBB, dl, TII->get(Alpha::BR)).addMBB(sinkMBB);
thisMBB->addSuccessor(llscMBB);
llscMBB->addSuccessor(llscMBB);
llscMBB->addSuccessor(sinkMBB);
F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
return sinkMBB;
}
bool
AlphaTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
// The Alpha target isn't yet aware of offsets.
return false;
}
bool AlphaTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
if (VT != MVT::f32 && VT != MVT::f64)
return false;
// +0.0 F31
// +0.0f F31
// -0.0 -F31
// -0.0f -F31
return Imm.isZero() || Imm.isNegZero();
}
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