nils.hoelscher
/
llvm-for-llvmta
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
llvm-for-llvmta/lib/Target/AMDGPU/R600ISelLowering.cpp

2281 lines
81 KiB
C++
Raw Permalink Normal View History

first commit
2022-04-25 10:02:23 +02:00
//===-- R600ISelLowering.cpp - R600 DAG Lowering Implementation -----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
/// Custom DAG lowering for R600
//
//===----------------------------------------------------------------------===//
#include "R600ISelLowering.h"
#include "AMDGPU.h"
#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
#include "R600Defines.h"
#include "R600InstrInfo.h"
#include "R600MachineFunctionInfo.h"
#include "R600Subtarget.h"
#include "llvm/IR/IntrinsicsAMDGPU.h"
#include "llvm/IR/IntrinsicsR600.h"
using namespace llvm;
#include "R600GenCallingConv.inc"
R600TargetLowering::R600TargetLowering(const TargetMachine &TM,
const R600Subtarget &STI)
: AMDGPUTargetLowering(TM, STI), Subtarget(&STI), Gen(STI.getGeneration()) {
addRegisterClass(MVT::f32, &R600::R600_Reg32RegClass);
addRegisterClass(MVT::i32, &R600::R600_Reg32RegClass);
addRegisterClass(MVT::v2f32, &R600::R600_Reg64RegClass);
addRegisterClass(MVT::v2i32, &R600::R600_Reg64RegClass);
addRegisterClass(MVT::v4f32, &R600::R600_Reg128RegClass);
addRegisterClass(MVT::v4i32, &R600::R600_Reg128RegClass);
setBooleanContents(ZeroOrNegativeOneBooleanContent);
setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
computeRegisterProperties(Subtarget->getRegisterInfo());
// Legalize loads and stores to the private address space.
setOperationAction(ISD::LOAD, MVT::i32, Custom);
setOperationAction(ISD::LOAD, MVT::v2i32, Custom);
setOperationAction(ISD::LOAD, MVT::v4i32, Custom);
// EXTLOAD should be the same as ZEXTLOAD. It is legal for some address
// spaces, so it is custom lowered to handle those where it isn't.
for (MVT VT : MVT::integer_valuetypes()) {
setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i8, Custom);
setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i16, Custom);
setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i1, Promote);
setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i8, Custom);
setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i16, Custom);
setLoadExtAction(ISD::EXTLOAD, VT, MVT::i1, Promote);
setLoadExtAction(ISD::EXTLOAD, VT, MVT::i8, Custom);
setLoadExtAction(ISD::EXTLOAD, VT, MVT::i16, Custom);
}
// Workaround for LegalizeDAG asserting on expansion of i1 vector loads.
setLoadExtAction(ISD::EXTLOAD, MVT::v2i32, MVT::v2i1, Expand);
setLoadExtAction(ISD::SEXTLOAD, MVT::v2i32, MVT::v2i1, Expand);
setLoadExtAction(ISD::ZEXTLOAD, MVT::v2i32, MVT::v2i1, Expand);
setLoadExtAction(ISD::EXTLOAD, MVT::v4i32, MVT::v4i1, Expand);
setLoadExtAction(ISD::SEXTLOAD, MVT::v4i32, MVT::v4i1, Expand);
setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i32, MVT::v4i1, Expand);
setOperationAction(ISD::STORE, MVT::i8, Custom);
setOperationAction(ISD::STORE, MVT::i32, Custom);
setOperationAction(ISD::STORE, MVT::v2i32, Custom);
setOperationAction(ISD::STORE, MVT::v4i32, Custom);
setTruncStoreAction(MVT::i32, MVT::i8, Custom);
setTruncStoreAction(MVT::i32, MVT::i16, Custom);
// We need to include these since trunc STORES to PRIVATE need
// special handling to accommodate RMW
setTruncStoreAction(MVT::v2i32, MVT::v2i16, Custom);
setTruncStoreAction(MVT::v4i32, MVT::v4i16, Custom);
setTruncStoreAction(MVT::v8i32, MVT::v8i16, Custom);
setTruncStoreAction(MVT::v16i32, MVT::v16i16, Custom);
setTruncStoreAction(MVT::v32i32, MVT::v32i16, Custom);
setTruncStoreAction(MVT::v2i32, MVT::v2i8, Custom);
setTruncStoreAction(MVT::v4i32, MVT::v4i8, Custom);
setTruncStoreAction(MVT::v8i32, MVT::v8i8, Custom);
setTruncStoreAction(MVT::v16i32, MVT::v16i8, Custom);
setTruncStoreAction(MVT::v32i32, MVT::v32i8, Custom);
// Workaround for LegalizeDAG asserting on expansion of i1 vector stores.
setTruncStoreAction(MVT::v2i32, MVT::v2i1, Expand);
setTruncStoreAction(MVT::v4i32, MVT::v4i1, Expand);
// Set condition code actions
setCondCodeAction(ISD::SETO, MVT::f32, Expand);
setCondCodeAction(ISD::SETUO, MVT::f32, Expand);
setCondCodeAction(ISD::SETLT, MVT::f32, Expand);
setCondCodeAction(ISD::SETLE, MVT::f32, Expand);
setCondCodeAction(ISD::SETOLT, MVT::f32, Expand);
setCondCodeAction(ISD::SETOLE, MVT::f32, Expand);
setCondCodeAction(ISD::SETONE, MVT::f32, Expand);
setCondCodeAction(ISD::SETUEQ, MVT::f32, Expand);
setCondCodeAction(ISD::SETUGE, MVT::f32, Expand);
setCondCodeAction(ISD::SETUGT, MVT::f32, Expand);
setCondCodeAction(ISD::SETULT, MVT::f32, Expand);
setCondCodeAction(ISD::SETULE, MVT::f32, Expand);
setCondCodeAction(ISD::SETLE, MVT::i32, Expand);
setCondCodeAction(ISD::SETLT, MVT::i32, Expand);
setCondCodeAction(ISD::SETULE, MVT::i32, Expand);
setCondCodeAction(ISD::SETULT, MVT::i32, Expand);
setOperationAction(ISD::FCOS, MVT::f32, Custom);
setOperationAction(ISD::FSIN, MVT::f32, Custom);
setOperationAction(ISD::SETCC, MVT::v4i32, Expand);
setOperationAction(ISD::SETCC, MVT::v2i32, Expand);
setOperationAction(ISD::BR_CC, MVT::i32, Expand);
setOperationAction(ISD::BR_CC, MVT::f32, Expand);
setOperationAction(ISD::BRCOND, MVT::Other, Custom);
setOperationAction(ISD::FSUB, MVT::f32, Expand);
setOperationAction(ISD::FCEIL, MVT::f64, Custom);
setOperationAction(ISD::FTRUNC, MVT::f64, Custom);
setOperationAction(ISD::FRINT, MVT::f64, Custom);
setOperationAction(ISD::FFLOOR, MVT::f64, Custom);
setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
setOperationAction(ISD::SETCC, MVT::i32, Expand);
setOperationAction(ISD::SETCC, MVT::f32, Expand);
setOperationAction(ISD::FP_TO_UINT, MVT::i1, Custom);
setOperationAction(ISD::FP_TO_SINT, MVT::i1, Custom);
setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
setOperationAction(ISD::FP_TO_UINT, MVT::i64, Custom);
setOperationAction(ISD::SELECT, MVT::i32, Expand);
setOperationAction(ISD::SELECT, MVT::f32, Expand);
setOperationAction(ISD::SELECT, MVT::v2i32, Expand);
setOperationAction(ISD::SELECT, MVT::v4i32, Expand);
// ADD, SUB overflow.
// TODO: turn these into Legal?
if (Subtarget->hasCARRY())
setOperationAction(ISD::UADDO, MVT::i32, Custom);
if (Subtarget->hasBORROW())
setOperationAction(ISD::USUBO, MVT::i32, Custom);
// Expand sign extension of vectors
if (!Subtarget->hasBFE())
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i1, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i1, Expand);
if (!Subtarget->hasBFE())
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i8, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i8, Expand);
if (!Subtarget->hasBFE())
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i16, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i16, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i32, Legal);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v2i32, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::v4i32, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::Other, Expand);
setOperationAction(ISD::FrameIndex, MVT::i32, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i32, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f32, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4i32, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i32, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2f32, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Custom);
// We don't have 64-bit shifts. Thus we need either SHX i64 or SHX_PARTS i32
// to be Legal/Custom in order to avoid library calls.
setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
if (!Subtarget->hasFMA()) {
setOperationAction(ISD::FMA, MVT::f32, Expand);
setOperationAction(ISD::FMA, MVT::f64, Expand);
}
// FIXME: May need no denormals check
setOperationAction(ISD::FMAD, MVT::f32, Legal);
if (!Subtarget->hasBFI()) {
// fcopysign can be done in a single instruction with BFI.
setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
}
if (!Subtarget->hasBCNT(32))
setOperationAction(ISD::CTPOP, MVT::i32, Expand);
if (!Subtarget->hasBCNT(64))
setOperationAction(ISD::CTPOP, MVT::i64, Expand);
if (Subtarget->hasFFBH())
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Custom);
if (Subtarget->hasFFBL())
setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Custom);
// FIXME: This was moved from AMDGPUTargetLowering, I'm not sure if we
// need it for R600.
if (Subtarget->hasBFE())
setHasExtractBitsInsn(true);
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
const MVT ScalarIntVTs[] = { MVT::i32, MVT::i64 };
for (MVT VT : ScalarIntVTs) {
setOperationAction(ISD::ADDC, VT, Expand);
setOperationAction(ISD::SUBC, VT, Expand);
setOperationAction(ISD::ADDE, VT, Expand);
setOperationAction(ISD::SUBE, VT, Expand);
}
// LLVM will expand these to atomic_cmp_swap(0)
// and atomic_swap, respectively.
setOperationAction(ISD::ATOMIC_LOAD, MVT::i32, Expand);
setOperationAction(ISD::ATOMIC_STORE, MVT::i32, Expand);
// We need to custom lower some of the intrinsics
setOperationAction(ISD::INTRINSIC_VOID, MVT::Other, Custom);
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
setSchedulingPreference(Sched::Source);
setTargetDAGCombine(ISD::FP_ROUND);
setTargetDAGCombine(ISD::FP_TO_SINT);
setTargetDAGCombine(ISD::EXTRACT_VECTOR_ELT);
setTargetDAGCombine(ISD::SELECT_CC);
setTargetDAGCombine(ISD::INSERT_VECTOR_ELT);
setTargetDAGCombine(ISD::LOAD);
}
static inline bool isEOP(MachineBasicBlock::iterator I) {
if (std::next(I) == I->getParent()->end())
return false;
return std::next(I)->getOpcode() == R600::RETURN;
}
MachineBasicBlock *
R600TargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *BB) const {
MachineFunction *MF = BB->getParent();
MachineRegisterInfo &MRI = MF->getRegInfo();
MachineBasicBlock::iterator I = MI;
const R600InstrInfo *TII = Subtarget->getInstrInfo();
switch (MI.getOpcode()) {
default:
// Replace LDS_*_RET instruction that don't have any uses with the
// equivalent LDS_*_NORET instruction.
if (TII->isLDSRetInstr(MI.getOpcode())) {
int DstIdx = TII->getOperandIdx(MI.getOpcode(), R600::OpName::dst);
assert(DstIdx != -1);
MachineInstrBuilder NewMI;
// FIXME: getLDSNoRetOp method only handles LDS_1A1D LDS ops. Add
// LDS_1A2D support and remove this special case.
if (!MRI.use_empty(MI.getOperand(DstIdx).getReg()) ||
MI.getOpcode() == R600::LDS_CMPST_RET)
return BB;
NewMI = BuildMI(*BB, I, BB->findDebugLoc(I),
TII->get(R600::getLDSNoRetOp(MI.getOpcode())));
for (unsigned i = 1, e = MI.getNumOperands(); i < e; ++i) {
NewMI.add(MI.getOperand(i));
}
} else {
return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
}
break;
case R600::FABS_R600: {
MachineInstr *NewMI = TII->buildDefaultInstruction(
*BB, I, R600::MOV, MI.getOperand(0).getReg(),
MI.getOperand(1).getReg());
TII->addFlag(*NewMI, 0, MO_FLAG_ABS);
break;
}
case R600::FNEG_R600: {
MachineInstr *NewMI = TII->buildDefaultInstruction(
*BB, I, R600::MOV, MI.getOperand(0).getReg(),
MI.getOperand(1).getReg());
TII->addFlag(*NewMI, 0, MO_FLAG_NEG);
break;
}
case R600::MASK_WRITE: {
Register maskedRegister = MI.getOperand(0).getReg();
assert(maskedRegister.isVirtual());
MachineInstr * defInstr = MRI.getVRegDef(maskedRegister);
TII->addFlag(*defInstr, 0, MO_FLAG_MASK);
break;
}
case R600::MOV_IMM_F32:
TII->buildMovImm(*BB, I, MI.getOperand(0).getReg(), MI.getOperand(1)
.getFPImm()
->getValueAPF()
.bitcastToAPInt()
.getZExtValue());
break;
case R600::MOV_IMM_I32:
TII->buildMovImm(*BB, I, MI.getOperand(0).getReg(),
MI.getOperand(1).getImm());
break;
case R600::MOV_IMM_GLOBAL_ADDR: {
//TODO: Perhaps combine this instruction with the next if possible
auto MIB = TII->buildDefaultInstruction(
*BB, MI, R600::MOV, MI.getOperand(0).getReg(), R600::ALU_LITERAL_X);
int Idx = TII->getOperandIdx(*MIB, R600::OpName::literal);
//TODO: Ugh this is rather ugly
MIB->getOperand(Idx) = MI.getOperand(1);
break;
}
case R600::CONST_COPY: {
MachineInstr *NewMI = TII->buildDefaultInstruction(
*BB, MI, R600::MOV, MI.getOperand(0).getReg(), R600::ALU_CONST);
TII->setImmOperand(*NewMI, R600::OpName::src0_sel,
MI.getOperand(1).getImm());
break;
}
case R600::RAT_WRITE_CACHELESS_32_eg:
case R600::RAT_WRITE_CACHELESS_64_eg:
case R600::RAT_WRITE_CACHELESS_128_eg:
BuildMI(*BB, I, BB->findDebugLoc(I), TII->get(MI.getOpcode()))
.add(MI.getOperand(0))
.add(MI.getOperand(1))
.addImm(isEOP(I)); // Set End of program bit
break;
case R600::RAT_STORE_TYPED_eg:
BuildMI(*BB, I, BB->findDebugLoc(I), TII->get(MI.getOpcode()))
.add(MI.getOperand(0))
.add(MI.getOperand(1))
.add(MI.getOperand(2))
.addImm(isEOP(I)); // Set End of program bit
break;
case R600::BRANCH:
BuildMI(*BB, I, BB->findDebugLoc(I), TII->get(R600::JUMP))
.add(MI.getOperand(0));
break;
case R600::BRANCH_COND_f32: {
MachineInstr *NewMI =
BuildMI(*BB, I, BB->findDebugLoc(I), TII->get(R600::PRED_X),
R600::PREDICATE_BIT)
.add(MI.getOperand(1))
.addImm(R600::PRED_SETNE)
.addImm(0); // Flags
TII->addFlag(*NewMI, 0, MO_FLAG_PUSH);
BuildMI(*BB, I, BB->findDebugLoc(I), TII->get(R600::JUMP_COND))
.add(MI.getOperand(0))
.addReg(R600::PREDICATE_BIT, RegState::Kill);
break;
}
case R600::BRANCH_COND_i32: {
MachineInstr *NewMI =
BuildMI(*BB, I, BB->findDebugLoc(I), TII->get(R600::PRED_X),
R600::PREDICATE_BIT)
.add(MI.getOperand(1))
.addImm(R600::PRED_SETNE_INT)
.addImm(0); // Flags
TII->addFlag(*NewMI, 0, MO_FLAG_PUSH);
BuildMI(*BB, I, BB->findDebugLoc(I), TII->get(R600::JUMP_COND))
.add(MI.getOperand(0))
.addReg(R600::PREDICATE_BIT, RegState::Kill);
break;
}
case R600::EG_ExportSwz:
case R600::R600_ExportSwz: {
// Instruction is left unmodified if its not the last one of its type
bool isLastInstructionOfItsType = true;
unsigned InstExportType = MI.getOperand(1).getImm();
for (MachineBasicBlock::iterator NextExportInst = std::next(I),
EndBlock = BB->end(); NextExportInst != EndBlock;
NextExportInst = std::next(NextExportInst)) {
if (NextExportInst->getOpcode() == R600::EG_ExportSwz ||
NextExportInst->getOpcode() == R600::R600_ExportSwz) {
unsigned CurrentInstExportType = NextExportInst->getOperand(1)
.getImm();
if (CurrentInstExportType == InstExportType) {
isLastInstructionOfItsType = false;
break;
}
}
}
bool EOP = isEOP(I);
if (!EOP && !isLastInstructionOfItsType)
return BB;
unsigned CfInst = (MI.getOpcode() == R600::EG_ExportSwz) ? 84 : 40;
BuildMI(*BB, I, BB->findDebugLoc(I), TII->get(MI.getOpcode()))
.add(MI.getOperand(0))
.add(MI.getOperand(1))
.add(MI.getOperand(2))
.add(MI.getOperand(3))
.add(MI.getOperand(4))
.add(MI.getOperand(5))
.add(MI.getOperand(6))
.addImm(CfInst)
.addImm(EOP);
break;
}
case R600::RETURN: {
return BB;
}
}
MI.eraseFromParent();
return BB;
}
//===----------------------------------------------------------------------===//
// Custom DAG Lowering Operations
//===----------------------------------------------------------------------===//
SDValue R600TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
R600MachineFunctionInfo *MFI = MF.getInfo<R600MachineFunctionInfo>();
switch (Op.getOpcode()) {
default: return AMDGPUTargetLowering::LowerOperation(Op, DAG);
case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
case ISD::INSERT_VECTOR_ELT: return LowerINSERT_VECTOR_ELT(Op, DAG);
case ISD::SHL_PARTS: return LowerSHLParts(Op, DAG);
case ISD::SRA_PARTS:
case ISD::SRL_PARTS: return LowerSRXParts(Op, DAG);
case ISD::UADDO: return LowerUADDSUBO(Op, DAG, ISD::ADD, AMDGPUISD::CARRY);
case ISD::USUBO: return LowerUADDSUBO(Op, DAG, ISD::SUB, AMDGPUISD::BORROW);
case ISD::FCOS:
case ISD::FSIN: return LowerTrig(Op, DAG);
case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
case ISD::STORE: return LowerSTORE(Op, DAG);
case ISD::LOAD: {
SDValue Result = LowerLOAD(Op, DAG);
assert((!Result.getNode() ||
Result.getNode()->getNumValues() == 2) &&
"Load should return a value and a chain");
return Result;
}
case ISD::BRCOND: return LowerBRCOND(Op, DAG);
case ISD::GlobalAddress: return LowerGlobalAddress(MFI, Op, DAG);
case ISD::FrameIndex: return lowerFrameIndex(Op, DAG);
case ISD::INTRINSIC_VOID: {
SDValue Chain = Op.getOperand(0);
unsigned IntrinsicID =
cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
switch (IntrinsicID) {
case Intrinsic::r600_store_swizzle: {
SDLoc DL(Op);
const SDValue Args[8] = {
Chain,
Op.getOperand(2), // Export Value
Op.getOperand(3), // ArrayBase
Op.getOperand(4), // Type
DAG.getConstant(0, DL, MVT::i32), // SWZ_X
DAG.getConstant(1, DL, MVT::i32), // SWZ_Y
DAG.getConstant(2, DL, MVT::i32), // SWZ_Z
DAG.getConstant(3, DL, MVT::i32) // SWZ_W
};
return DAG.getNode(AMDGPUISD::R600_EXPORT, DL, Op.getValueType(), Args);
}
// default for switch(IntrinsicID)
default: break;
}
// break out of case ISD::INTRINSIC_VOID in switch(Op.getOpcode())
break;
}
case ISD::INTRINSIC_WO_CHAIN: {
unsigned IntrinsicID =
cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
EVT VT = Op.getValueType();
SDLoc DL(Op);
switch (IntrinsicID) {
case Intrinsic::r600_tex:
case Intrinsic::r600_texc: {
unsigned TextureOp;
switch (IntrinsicID) {
case Intrinsic::r600_tex:
TextureOp = 0;
break;
case Intrinsic::r600_texc:
TextureOp = 1;
break;
default:
llvm_unreachable("unhandled texture operation");
}
SDValue TexArgs[19] = {
DAG.getConstant(TextureOp, DL, MVT::i32),
Op.getOperand(1),
DAG.getConstant(0, DL, MVT::i32),
DAG.getConstant(1, DL, MVT::i32),
DAG.getConstant(2, DL, MVT::i32),
DAG.getConstant(3, DL, MVT::i32),
Op.getOperand(2),
Op.getOperand(3),
Op.getOperand(4),
DAG.getConstant(0, DL, MVT::i32),
DAG.getConstant(1, DL, MVT::i32),
DAG.getConstant(2, DL, MVT::i32),
DAG.getConstant(3, DL, MVT::i32),
Op.getOperand(5),
Op.getOperand(6),
Op.getOperand(7),
Op.getOperand(8),
Op.getOperand(9),
Op.getOperand(10)
};
return DAG.getNode(AMDGPUISD::TEXTURE_FETCH, DL, MVT::v4f32, TexArgs);
}
case Intrinsic::r600_dot4: {
SDValue Args[8] = {
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32, Op.getOperand(1),
DAG.getConstant(0, DL, MVT::i32)),
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32, Op.getOperand(2),
DAG.getConstant(0, DL, MVT::i32)),
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32, Op.getOperand(1),
DAG.getConstant(1, DL, MVT::i32)),
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32, Op.getOperand(2),
DAG.getConstant(1, DL, MVT::i32)),
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32, Op.getOperand(1),
DAG.getConstant(2, DL, MVT::i32)),
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32, Op.getOperand(2),
DAG.getConstant(2, DL, MVT::i32)),
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32, Op.getOperand(1),
DAG.getConstant(3, DL, MVT::i32)),
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32, Op.getOperand(2),
DAG.getConstant(3, DL, MVT::i32))
};
return DAG.getNode(AMDGPUISD::DOT4, DL, MVT::f32, Args);
}
case Intrinsic::r600_implicitarg_ptr: {
MVT PtrVT = getPointerTy(DAG.getDataLayout(), AMDGPUAS::PARAM_I_ADDRESS);
uint32_t ByteOffset = getImplicitParameterOffset(MF, FIRST_IMPLICIT);
return DAG.getConstant(ByteOffset, DL, PtrVT);
}
case Intrinsic::r600_read_ngroups_x:
return LowerImplicitParameter(DAG, VT, DL, 0);
case Intrinsic::r600_read_ngroups_y:
return LowerImplicitParameter(DAG, VT, DL, 1);
case Intrinsic::r600_read_ngroups_z:
return LowerImplicitParameter(DAG, VT, DL, 2);
case Intrinsic::r600_read_global_size_x:
return LowerImplicitParameter(DAG, VT, DL, 3);
case Intrinsic::r600_read_global_size_y:
return LowerImplicitParameter(DAG, VT, DL, 4);
case Intrinsic::r600_read_global_size_z:
return LowerImplicitParameter(DAG, VT, DL, 5);
case Intrinsic::r600_read_local_size_x:
return LowerImplicitParameter(DAG, VT, DL, 6);
case Intrinsic::r600_read_local_size_y:
return LowerImplicitParameter(DAG, VT, DL, 7);
case Intrinsic::r600_read_local_size_z:
return LowerImplicitParameter(DAG, VT, DL, 8);
case Intrinsic::r600_read_tgid_x:
case Intrinsic::amdgcn_workgroup_id_x:
return CreateLiveInRegisterRaw(DAG, &R600::R600_TReg32RegClass,
R600::T1_X, VT);
case Intrinsic::r600_read_tgid_y:
case Intrinsic::amdgcn_workgroup_id_y:
return CreateLiveInRegisterRaw(DAG, &R600::R600_TReg32RegClass,
R600::T1_Y, VT);
case Intrinsic::r600_read_tgid_z:
case Intrinsic::amdgcn_workgroup_id_z:
return CreateLiveInRegisterRaw(DAG, &R600::R600_TReg32RegClass,
R600::T1_Z, VT);
case Intrinsic::r600_read_tidig_x:
case Intrinsic::amdgcn_workitem_id_x:
return CreateLiveInRegisterRaw(DAG, &R600::R600_TReg32RegClass,
R600::T0_X, VT);
case Intrinsic::r600_read_tidig_y:
case Intrinsic::amdgcn_workitem_id_y:
return CreateLiveInRegisterRaw(DAG, &R600::R600_TReg32RegClass,
R600::T0_Y, VT);
case Intrinsic::r600_read_tidig_z:
case Intrinsic::amdgcn_workitem_id_z:
return CreateLiveInRegisterRaw(DAG, &R600::R600_TReg32RegClass,
R600::T0_Z, VT);
case Intrinsic::r600_recipsqrt_ieee:
return DAG.getNode(AMDGPUISD::RSQ, DL, VT, Op.getOperand(1));
case Intrinsic::r600_recipsqrt_clamped:
return DAG.getNode(AMDGPUISD::RSQ_CLAMP, DL, VT, Op.getOperand(1));
default:
return Op;
}
// break out of case ISD::INTRINSIC_WO_CHAIN in switch(Op.getOpcode())
break;
}
} // end switch(Op.getOpcode())
return SDValue();
}
void R600TargetLowering::ReplaceNodeResults(SDNode *N,
SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) const {
switch (N->getOpcode()) {
default:
AMDGPUTargetLowering::ReplaceNodeResults(N, Results, DAG);
return;
case ISD::FP_TO_UINT:
if (N->getValueType(0) == MVT::i1) {
Results.push_back(lowerFP_TO_UINT(N->getOperand(0), DAG));
return;
}
// Since we don't care about out of bounds values we can use FP_TO_SINT for
// uints too. The DAGLegalizer code for uint considers some extra cases
// which are not necessary here.
LLVM_FALLTHROUGH;
case ISD::FP_TO_SINT: {
if (N->getValueType(0) == MVT::i1) {
Results.push_back(lowerFP_TO_SINT(N->getOperand(0), DAG));
return;
}
SDValue Result;
if (expandFP_TO_SINT(N, Result, DAG))
Results.push_back(Result);
return;
}
case ISD::SDIVREM: {
SDValue Op = SDValue(N, 1);
SDValue RES = LowerSDIVREM(Op, DAG);
Results.push_back(RES);
Results.push_back(RES.getValue(1));
break;
}
case ISD::UDIVREM: {
SDValue Op = SDValue(N, 0);
LowerUDIVREM64(Op, DAG, Results);
break;
}
}
}
SDValue R600TargetLowering::vectorToVerticalVector(SelectionDAG &DAG,
SDValue Vector) const {
SDLoc DL(Vector);
EVT VecVT = Vector.getValueType();
EVT EltVT = VecVT.getVectorElementType();
SmallVector<SDValue, 8> Args;
for (unsigned i = 0, e = VecVT.getVectorNumElements(); i != e; ++i) {
Args.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, EltVT, Vector,
DAG.getVectorIdxConstant(i, DL)));
}
return DAG.getNode(AMDGPUISD::BUILD_VERTICAL_VECTOR, DL, VecVT, Args);
}
SDValue R600TargetLowering::LowerEXTRACT_VECTOR_ELT(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
SDValue Vector = Op.getOperand(0);
SDValue Index = Op.getOperand(1);
if (isa<ConstantSDNode>(Index) ||
Vector.getOpcode() == AMDGPUISD::BUILD_VERTICAL_VECTOR)
return Op;
Vector = vectorToVerticalVector(DAG, Vector);
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, Op.getValueType(),
Vector, Index);
}
SDValue R600TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
SDValue Vector = Op.getOperand(0);
SDValue Value = Op.getOperand(1);
SDValue Index = Op.getOperand(2);
if (isa<ConstantSDNode>(Index) ||
Vector.getOpcode() == AMDGPUISD::BUILD_VERTICAL_VECTOR)
return Op;
Vector = vectorToVerticalVector(DAG, Vector);
SDValue Insert = DAG.getNode(ISD::INSERT_VECTOR_ELT, DL, Op.getValueType(),
Vector, Value, Index);
return vectorToVerticalVector(DAG, Insert);
}
SDValue R600TargetLowering::LowerGlobalAddress(AMDGPUMachineFunction *MFI,
SDValue Op,
SelectionDAG &DAG) const {
GlobalAddressSDNode *GSD = cast<GlobalAddressSDNode>(Op);
if (GSD->getAddressSpace() != AMDGPUAS::CONSTANT_ADDRESS)
return AMDGPUTargetLowering::LowerGlobalAddress(MFI, Op, DAG);
const DataLayout &DL = DAG.getDataLayout();
const GlobalValue *GV = GSD->getGlobal();
MVT ConstPtrVT = getPointerTy(DL, AMDGPUAS::CONSTANT_ADDRESS);
SDValue GA = DAG.getTargetGlobalAddress(GV, SDLoc(GSD), ConstPtrVT);
return DAG.getNode(AMDGPUISD::CONST_DATA_PTR, SDLoc(GSD), ConstPtrVT, GA);
}
SDValue R600TargetLowering::LowerTrig(SDValue Op, SelectionDAG &DAG) const {
// On hw >= R700, COS/SIN input must be between -1. and 1.
// Thus we lower them to TRIG ( FRACT ( x / 2Pi + 0.5) - 0.5)
EVT VT = Op.getValueType();
SDValue Arg = Op.getOperand(0);
SDLoc DL(Op);
// TODO: Should this propagate fast-math-flags?
SDValue FractPart = DAG.getNode(AMDGPUISD::FRACT, DL, VT,
DAG.getNode(ISD::FADD, DL, VT,
DAG.getNode(ISD::FMUL, DL, VT, Arg,
DAG.getConstantFP(0.15915494309, DL, MVT::f32)),
DAG.getConstantFP(0.5, DL, MVT::f32)));
unsigned TrigNode;
switch (Op.getOpcode()) {
case ISD::FCOS:
TrigNode = AMDGPUISD::COS_HW;
break;
case ISD::FSIN:
TrigNode = AMDGPUISD::SIN_HW;
break;
default:
llvm_unreachable("Wrong trig opcode");
}
SDValue TrigVal = DAG.getNode(TrigNode, DL, VT,
DAG.getNode(ISD::FADD, DL, VT, FractPart,
DAG.getConstantFP(-0.5, DL, MVT::f32)));
if (Gen >= AMDGPUSubtarget::R700)
return TrigVal;
// On R600 hw, COS/SIN input must be between -Pi and Pi.
return DAG.getNode(ISD::FMUL, DL, VT, TrigVal,
DAG.getConstantFP(numbers::pif, DL, MVT::f32));
}
SDValue R600TargetLowering::LowerSHLParts(SDValue Op, SelectionDAG &DAG) const {
SDLoc DL(Op);
EVT VT = Op.getValueType();
SDValue Lo = Op.getOperand(0);
SDValue Hi = Op.getOperand(1);
SDValue Shift = Op.getOperand(2);
SDValue Zero = DAG.getConstant(0, DL, VT);
SDValue One = DAG.getConstant(1, DL, VT);
SDValue Width = DAG.getConstant(VT.getSizeInBits(), DL, VT);
SDValue Width1 = DAG.getConstant(VT.getSizeInBits() - 1, DL, VT);
SDValue BigShift = DAG.getNode(ISD::SUB, DL, VT, Shift, Width);
SDValue CompShift = DAG.getNode(ISD::SUB, DL, VT, Width1, Shift);
// The dance around Width1 is necessary for 0 special case.
// Without it the CompShift might be 32, producing incorrect results in
// Overflow. So we do the shift in two steps, the alternative is to
// add a conditional to filter the special case.
SDValue Overflow = DAG.getNode(ISD::SRL, DL, VT, Lo, CompShift);
Overflow = DAG.getNode(ISD::SRL, DL, VT, Overflow, One);
SDValue HiSmall = DAG.getNode(ISD::SHL, DL, VT, Hi, Shift);
HiSmall = DAG.getNode(ISD::OR, DL, VT, HiSmall, Overflow);
SDValue LoSmall = DAG.getNode(ISD::SHL, DL, VT, Lo, Shift);
SDValue HiBig = DAG.getNode(ISD::SHL, DL, VT, Lo, BigShift);
SDValue LoBig = Zero;
Hi = DAG.getSelectCC(DL, Shift, Width, HiSmall, HiBig, ISD::SETULT);
Lo = DAG.getSelectCC(DL, Shift, Width, LoSmall, LoBig, ISD::SETULT);
return DAG.getNode(ISD::MERGE_VALUES, DL, DAG.getVTList(VT,VT), Lo, Hi);
}
SDValue R600TargetLowering::LowerSRXParts(SDValue Op, SelectionDAG &DAG) const {
SDLoc DL(Op);
EVT VT = Op.getValueType();
SDValue Lo = Op.getOperand(0);
SDValue Hi = Op.getOperand(1);
SDValue Shift = Op.getOperand(2);
SDValue Zero = DAG.getConstant(0, DL, VT);
SDValue One = DAG.getConstant(1, DL, VT);
const bool SRA = Op.getOpcode() == ISD::SRA_PARTS;
SDValue Width = DAG.getConstant(VT.getSizeInBits(), DL, VT);
SDValue Width1 = DAG.getConstant(VT.getSizeInBits() - 1, DL, VT);
SDValue BigShift = DAG.getNode(ISD::SUB, DL, VT, Shift, Width);
SDValue CompShift = DAG.getNode(ISD::SUB, DL, VT, Width1, Shift);
// The dance around Width1 is necessary for 0 special case.
// Without it the CompShift might be 32, producing incorrect results in
// Overflow. So we do the shift in two steps, the alternative is to
// add a conditional to filter the special case.
SDValue Overflow = DAG.getNode(ISD::SHL, DL, VT, Hi, CompShift);
Overflow = DAG.getNode(ISD::SHL, DL, VT, Overflow, One);
SDValue HiSmall = DAG.getNode(SRA ? ISD::SRA : ISD::SRL, DL, VT, Hi, Shift);
SDValue LoSmall = DAG.getNode(ISD::SRL, DL, VT, Lo, Shift);
LoSmall = DAG.getNode(ISD::OR, DL, VT, LoSmall, Overflow);
SDValue LoBig = DAG.getNode(SRA ? ISD::SRA : ISD::SRL, DL, VT, Hi, BigShift);
SDValue HiBig = SRA ? DAG.getNode(ISD::SRA, DL, VT, Hi, Width1) : Zero;
Hi = DAG.getSelectCC(DL, Shift, Width, HiSmall, HiBig, ISD::SETULT);
Lo = DAG.getSelectCC(DL, Shift, Width, LoSmall, LoBig, ISD::SETULT);
return DAG.getNode(ISD::MERGE_VALUES, DL, DAG.getVTList(VT,VT), Lo, Hi);
}
SDValue R600TargetLowering::LowerUADDSUBO(SDValue Op, SelectionDAG &DAG,
unsigned mainop, unsigned ovf) const {
SDLoc DL(Op);
EVT VT = Op.getValueType();
SDValue Lo = Op.getOperand(0);
SDValue Hi = Op.getOperand(1);
SDValue OVF = DAG.getNode(ovf, DL, VT, Lo, Hi);
// Extend sign.
OVF = DAG.getNode(ISD::SIGN_EXTEND_INREG, DL, VT, OVF,
DAG.getValueType(MVT::i1));
SDValue Res = DAG.getNode(mainop, DL, VT, Lo, Hi);
return DAG.getNode(ISD::MERGE_VALUES, DL, DAG.getVTList(VT, VT), Res, OVF);
}
SDValue R600TargetLowering::lowerFP_TO_UINT(SDValue Op, SelectionDAG &DAG) const {
SDLoc DL(Op);
return DAG.getNode(
ISD::SETCC,
DL,
MVT::i1,
Op, DAG.getConstantFP(1.0f, DL, MVT::f32),
DAG.getCondCode(ISD::SETEQ));
}
SDValue R600TargetLowering::lowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const {
SDLoc DL(Op);
return DAG.getNode(
ISD::SETCC,
DL,
MVT::i1,
Op, DAG.getConstantFP(-1.0f, DL, MVT::f32),
DAG.getCondCode(ISD::SETEQ));
}
SDValue R600TargetLowering::LowerImplicitParameter(SelectionDAG &DAG, EVT VT,
const SDLoc &DL,
unsigned DwordOffset) const {
unsigned ByteOffset = DwordOffset * 4;
PointerType * PtrType = PointerType::get(VT.getTypeForEVT(*DAG.getContext()),
AMDGPUAS::PARAM_I_ADDRESS);
// We shouldn't be using an offset wider than 16-bits for implicit parameters.
assert(isInt<16>(ByteOffset));
return DAG.getLoad(VT, DL, DAG.getEntryNode(),
DAG.getConstant(ByteOffset, DL, MVT::i32), // PTR
MachinePointerInfo(ConstantPointerNull::get(PtrType)));
}
bool R600TargetLowering::isZero(SDValue Op) const {
if(ConstantSDNode *Cst = dyn_cast<ConstantSDNode>(Op)) {
return Cst->isNullValue();
} else if(ConstantFPSDNode *CstFP = dyn_cast<ConstantFPSDNode>(Op)){
return CstFP->isZero();
} else {
return false;
}
}
bool R600TargetLowering::isHWTrueValue(SDValue Op) const {
if (ConstantFPSDNode * CFP = dyn_cast<ConstantFPSDNode>(Op)) {
return CFP->isExactlyValue(1.0);
}
return isAllOnesConstant(Op);
}
bool R600TargetLowering::isHWFalseValue(SDValue Op) const {
if (ConstantFPSDNode * CFP = dyn_cast<ConstantFPSDNode>(Op)) {
return CFP->getValueAPF().isZero();
}
return isNullConstant(Op);
}
SDValue R600TargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
SDLoc DL(Op);
EVT VT = Op.getValueType();
SDValue LHS = Op.getOperand(0);
SDValue RHS = Op.getOperand(1);
SDValue True = Op.getOperand(2);
SDValue False = Op.getOperand(3);
SDValue CC = Op.getOperand(4);
SDValue Temp;
if (VT == MVT::f32) {
DAGCombinerInfo DCI(DAG, AfterLegalizeVectorOps, true, nullptr);
SDValue MinMax = combineFMinMaxLegacy(DL, VT, LHS, RHS, True, False, CC, DCI);
if (MinMax)
return MinMax;
}
// LHS and RHS are guaranteed to be the same value type
EVT CompareVT = LHS.getValueType();
// Check if we can lower this to a native operation.
// Try to lower to a SET* instruction:
//
// SET* can match the following patterns:
//
// select_cc f32, f32, -1, 0, cc_supported
// select_cc f32, f32, 1.0f, 0.0f, cc_supported
// select_cc i32, i32, -1, 0, cc_supported
//
// Move hardware True/False values to the correct operand.
if (isHWTrueValue(False) && isHWFalseValue(True)) {
ISD::CondCode CCOpcode = cast<CondCodeSDNode>(CC)->get();
ISD::CondCode InverseCC = ISD::getSetCCInverse(CCOpcode, CompareVT);
if (isCondCodeLegal(InverseCC, CompareVT.getSimpleVT())) {
std::swap(False, True);
CC = DAG.getCondCode(InverseCC);
} else {
ISD::CondCode SwapInvCC = ISD::getSetCCSwappedOperands(InverseCC);
if (isCondCodeLegal(SwapInvCC, CompareVT.getSimpleVT())) {
std::swap(False, True);
std::swap(LHS, RHS);
CC = DAG.getCondCode(SwapInvCC);
}
}
}
if (isHWTrueValue(True) && isHWFalseValue(False) &&
(CompareVT == VT || VT == MVT::i32)) {
// This can be matched by a SET* instruction.
return DAG.getNode(ISD::SELECT_CC, DL, VT, LHS, RHS, True, False, CC);
}
// Try to lower to a CND* instruction:
//
// CND* can match the following patterns:
//
// select_cc f32, 0.0, f32, f32, cc_supported
// select_cc f32, 0.0, i32, i32, cc_supported
// select_cc i32, 0, f32, f32, cc_supported
// select_cc i32, 0, i32, i32, cc_supported
//
// Try to move the zero value to the RHS
if (isZero(LHS)) {
ISD::CondCode CCOpcode = cast<CondCodeSDNode>(CC)->get();
// Try swapping the operands
ISD::CondCode CCSwapped = ISD::getSetCCSwappedOperands(CCOpcode);
if (isCondCodeLegal(CCSwapped, CompareVT.getSimpleVT())) {
std::swap(LHS, RHS);
CC = DAG.getCondCode(CCSwapped);
} else {
// Try inverting the conditon and then swapping the operands
ISD::CondCode CCInv = ISD::getSetCCInverse(CCOpcode, CompareVT);
CCSwapped = ISD::getSetCCSwappedOperands(CCInv);
if (isCondCodeLegal(CCSwapped, CompareVT.getSimpleVT())) {
std::swap(True, False);
std::swap(LHS, RHS);
CC = DAG.getCondCode(CCSwapped);
}
}
}
if (isZero(RHS)) {
SDValue Cond = LHS;
SDValue Zero = RHS;
ISD::CondCode CCOpcode = cast<CondCodeSDNode>(CC)->get();
if (CompareVT != VT) {
// Bitcast True / False to the correct types. This will end up being
// a nop, but it allows us to define only a single pattern in the
// .TD files for each CND* instruction rather than having to have
// one pattern for integer True/False and one for fp True/False
True = DAG.getNode(ISD::BITCAST, DL, CompareVT, True);
False = DAG.getNode(ISD::BITCAST, DL, CompareVT, False);
}
switch (CCOpcode) {
case ISD::SETONE:
case ISD::SETUNE:
case ISD::SETNE:
CCOpcode = ISD::getSetCCInverse(CCOpcode, CompareVT);
Temp = True;
True = False;
False = Temp;
break;
default:
break;
}
SDValue SelectNode = DAG.getNode(ISD::SELECT_CC, DL, CompareVT,
Cond, Zero,
True, False,
DAG.getCondCode(CCOpcode));
return DAG.getNode(ISD::BITCAST, DL, VT, SelectNode);
}
// If we make it this for it means we have no native instructions to handle
// this SELECT_CC, so we must lower it.
SDValue HWTrue, HWFalse;
if (CompareVT == MVT::f32) {
HWTrue = DAG.getConstantFP(1.0f, DL, CompareVT);
HWFalse = DAG.getConstantFP(0.0f, DL, CompareVT);
} else if (CompareVT == MVT::i32) {
HWTrue = DAG.getConstant(-1, DL, CompareVT);
HWFalse = DAG.getConstant(0, DL, CompareVT);
}
else {
llvm_unreachable("Unhandled value type in LowerSELECT_CC");
}
// Lower this unsupported SELECT_CC into a combination of two supported
// SELECT_CC operations.
SDValue Cond = DAG.getNode(ISD::SELECT_CC, DL, CompareVT, LHS, RHS, HWTrue, HWFalse, CC);
return DAG.getNode(ISD::SELECT_CC, DL, VT,
Cond, HWFalse,
True, False,
DAG.getCondCode(ISD::SETNE));
}
/// LLVM generates byte-addressed pointers. For indirect addressing, we need to
/// convert these pointers to a register index. Each register holds
/// 16 bytes, (4 x 32bit sub-register), but we need to take into account the
/// \p StackWidth, which tells us how many of the 4 sub-registrers will be used
/// for indirect addressing.
SDValue R600TargetLowering::stackPtrToRegIndex(SDValue Ptr,
unsigned StackWidth,
SelectionDAG &DAG) const {
unsigned SRLPad;
switch(StackWidth) {
case 1:
SRLPad = 2;
break;
case 2:
SRLPad = 3;
break;
case 4:
SRLPad = 4;
break;
default: llvm_unreachable("Invalid stack width");
}
SDLoc DL(Ptr);
return DAG.getNode(ISD::SRL, DL, Ptr.getValueType(), Ptr,
DAG.getConstant(SRLPad, DL, MVT::i32));
}
void R600TargetLowering::getStackAddress(unsigned StackWidth,
unsigned ElemIdx,
unsigned &Channel,
unsigned &PtrIncr) const {
switch (StackWidth) {
default:
case 1:
Channel = 0;
if (ElemIdx > 0) {
PtrIncr = 1;
} else {
PtrIncr = 0;
}
break;
case 2:
Channel = ElemIdx % 2;
if (ElemIdx == 2) {
PtrIncr = 1;
} else {
PtrIncr = 0;
}
break;
case 4:
Channel = ElemIdx;
PtrIncr = 0;
break;
}
}
SDValue R600TargetLowering::lowerPrivateTruncStore(StoreSDNode *Store,
SelectionDAG &DAG) const {
SDLoc DL(Store);
//TODO: Who creates the i8 stores?
assert(Store->isTruncatingStore()
|| Store->getValue().getValueType() == MVT::i8);
assert(Store->getAddressSpace() == AMDGPUAS::PRIVATE_ADDRESS);
SDValue Mask;
if (Store->getMemoryVT() == MVT::i8) {
assert(Store->getAlignment() >= 1);
Mask = DAG.getConstant(0xff, DL, MVT::i32);
} else if (Store->getMemoryVT() == MVT::i16) {
assert(Store->getAlignment() >= 2);
Mask = DAG.getConstant(0xffff, DL, MVT::i32);
} else {
llvm_unreachable("Unsupported private trunc store");
}
SDValue OldChain = Store->getChain();
bool VectorTrunc = (OldChain.getOpcode() == AMDGPUISD::DUMMY_CHAIN);
// Skip dummy
SDValue Chain = VectorTrunc ? OldChain->getOperand(0) : OldChain;
SDValue BasePtr = Store->getBasePtr();
SDValue Offset = Store->getOffset();
EVT MemVT = Store->getMemoryVT();
SDValue LoadPtr = BasePtr;
if (!Offset.isUndef()) {
LoadPtr = DAG.getNode(ISD::ADD, DL, MVT::i32, BasePtr, Offset);
}
// Get dword location
// TODO: this should be eliminated by the future SHR ptr, 2
SDValue Ptr = DAG.getNode(ISD::AND, DL, MVT::i32, LoadPtr,
DAG.getConstant(0xfffffffc, DL, MVT::i32));
// Load dword
// TODO: can we be smarter about machine pointer info?
MachinePointerInfo PtrInfo(AMDGPUAS::PRIVATE_ADDRESS);
SDValue Dst = DAG.getLoad(MVT::i32, DL, Chain, Ptr, PtrInfo);
Chain = Dst.getValue(1);
// Get offset in dword
SDValue ByteIdx = DAG.getNode(ISD::AND, DL, MVT::i32, LoadPtr,
DAG.getConstant(0x3, DL, MVT::i32));
// Convert byte offset to bit shift
SDValue ShiftAmt = DAG.getNode(ISD::SHL, DL, MVT::i32, ByteIdx,
DAG.getConstant(3, DL, MVT::i32));
// TODO: Contrary to the name of the functiom,
// it also handles sub i32 non-truncating stores (like i1)
SDValue SExtValue = DAG.getNode(ISD::SIGN_EXTEND, DL, MVT::i32,
Store->getValue());
// Mask the value to the right type
SDValue MaskedValue = DAG.getZeroExtendInReg(SExtValue, DL, MemVT);
// Shift the value in place
SDValue ShiftedValue = DAG.getNode(ISD::SHL, DL, MVT::i32,
MaskedValue, ShiftAmt);
// Shift the mask in place
SDValue DstMask = DAG.getNode(ISD::SHL, DL, MVT::i32, Mask, ShiftAmt);
// Invert the mask. NOTE: if we had native ROL instructions we could
// use inverted mask
DstMask = DAG.getNOT(DL, DstMask, MVT::i32);
// Cleanup the target bits
Dst = DAG.getNode(ISD::AND, DL, MVT::i32, Dst, DstMask);
// Add the new bits
SDValue Value = DAG.getNode(ISD::OR, DL, MVT::i32, Dst, ShiftedValue);
// Store dword
// TODO: Can we be smarter about MachinePointerInfo?
SDValue NewStore = DAG.getStore(Chain, DL, Value, Ptr, PtrInfo);
// If we are part of expanded vector, make our neighbors depend on this store
if (VectorTrunc) {
// Make all other vector elements depend on this store
Chain = DAG.getNode(AMDGPUISD::DUMMY_CHAIN, DL, MVT::Other, NewStore);
DAG.ReplaceAllUsesOfValueWith(OldChain, Chain);
}
return NewStore;
}
SDValue R600TargetLowering::LowerSTORE(SDValue Op, SelectionDAG &DAG) const {
StoreSDNode *StoreNode = cast<StoreSDNode>(Op);
unsigned AS = StoreNode->getAddressSpace();
SDValue Chain = StoreNode->getChain();
SDValue Ptr = StoreNode->getBasePtr();
SDValue Value = StoreNode->getValue();
EVT VT = Value.getValueType();
EVT MemVT = StoreNode->getMemoryVT();
EVT PtrVT = Ptr.getValueType();
SDLoc DL(Op);
const bool TruncatingStore = StoreNode->isTruncatingStore();
// Neither LOCAL nor PRIVATE can do vectors at the moment
if ((AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::PRIVATE_ADDRESS ||
TruncatingStore) &&
VT.isVector()) {
if ((AS == AMDGPUAS::PRIVATE_ADDRESS) && TruncatingStore) {
// Add an extra level of chain to isolate this vector
SDValue NewChain = DAG.getNode(AMDGPUISD::DUMMY_CHAIN, DL, MVT::Other, Chain);
// TODO: can the chain be replaced without creating a new store?
SDValue NewStore = DAG.getTruncStore(
NewChain, DL, Value, Ptr, StoreNode->getPointerInfo(),
MemVT, StoreNode->getAlignment(),
StoreNode->getMemOperand()->getFlags(), StoreNode->getAAInfo());
StoreNode = cast<StoreSDNode>(NewStore);
}
return scalarizeVectorStore(StoreNode, DAG);
}
Align Alignment = StoreNode->getAlign();
if (Alignment < MemVT.getStoreSize() &&
!allowsMisalignedMemoryAccesses(MemVT, AS, Alignment.value(),
StoreNode->getMemOperand()->getFlags(),
nullptr)) {
return expandUnalignedStore(StoreNode, DAG);
}
SDValue DWordAddr = DAG.getNode(ISD::SRL, DL, PtrVT, Ptr,
DAG.getConstant(2, DL, PtrVT));
if (AS == AMDGPUAS::GLOBAL_ADDRESS) {
// It is beneficial to create MSKOR here instead of combiner to avoid
// artificial dependencies introduced by RMW
if (TruncatingStore) {
assert(VT.bitsLE(MVT::i32));
SDValue MaskConstant;
if (MemVT == MVT::i8) {
MaskConstant = DAG.getConstant(0xFF, DL, MVT::i32);
} else {
assert(MemVT == MVT::i16);
assert(StoreNode->getAlignment() >= 2);
MaskConstant = DAG.getConstant(0xFFFF, DL, MVT::i32);
}
SDValue ByteIndex = DAG.getNode(ISD::AND, DL, PtrVT, Ptr,
DAG.getConstant(0x00000003, DL, PtrVT));
SDValue BitShift = DAG.getNode(ISD::SHL, DL, VT, ByteIndex,
DAG.getConstant(3, DL, VT));
// Put the mask in correct place
SDValue Mask = DAG.getNode(ISD::SHL, DL, VT, MaskConstant, BitShift);
// Put the value bits in correct place
SDValue TruncValue = DAG.getNode(ISD::AND, DL, VT, Value, MaskConstant);
SDValue ShiftedValue = DAG.getNode(ISD::SHL, DL, VT, TruncValue, BitShift);
// XXX: If we add a 64-bit ZW register class, then we could use a 2 x i32
// vector instead.
SDValue Src[4] = {
ShiftedValue,
DAG.getConstant(0, DL, MVT::i32),
DAG.getConstant(0, DL, MVT::i32),
Mask
};
SDValue Input = DAG.getBuildVector(MVT::v4i32, DL, Src);
SDValue Args[3] = { Chain, Input, DWordAddr };
return DAG.getMemIntrinsicNode(AMDGPUISD::STORE_MSKOR, DL,
Op->getVTList(), Args, MemVT,
StoreNode->getMemOperand());
} else if (Ptr->getOpcode() != AMDGPUISD::DWORDADDR && VT.bitsGE(MVT::i32)) {
// Convert pointer from byte address to dword address.
Ptr = DAG.getNode(AMDGPUISD::DWORDADDR, DL, PtrVT, DWordAddr);
if (StoreNode->isIndexed()) {
llvm_unreachable("Indexed stores not supported yet");
} else {
Chain = DAG.getStore(Chain, DL, Value, Ptr, StoreNode->getMemOperand());
}
return Chain;
}
}
// GLOBAL_ADDRESS has been handled above, LOCAL_ADDRESS allows all sizes
if (AS != AMDGPUAS::PRIVATE_ADDRESS)
return SDValue();
if (MemVT.bitsLT(MVT::i32))
return lowerPrivateTruncStore(StoreNode, DAG);
// Standard i32+ store, tag it with DWORDADDR to note that the address
// has been shifted
if (Ptr.getOpcode() != AMDGPUISD::DWORDADDR) {
Ptr = DAG.getNode(AMDGPUISD::DWORDADDR, DL, PtrVT, DWordAddr);
return DAG.getStore(Chain, DL, Value, Ptr, StoreNode->getMemOperand());
}
// Tagged i32+ stores will be matched by patterns
return SDValue();
}
// return (512 + (kc_bank << 12)
static int
ConstantAddressBlock(unsigned AddressSpace) {
switch (AddressSpace) {
case AMDGPUAS::CONSTANT_BUFFER_0:
return 512;
case AMDGPUAS::CONSTANT_BUFFER_1:
return 512 + 4096;
case AMDGPUAS::CONSTANT_BUFFER_2:
return 512 + 4096 * 2;
case AMDGPUAS::CONSTANT_BUFFER_3:
return 512 + 4096 * 3;
case AMDGPUAS::CONSTANT_BUFFER_4:
return 512 + 4096 * 4;
case AMDGPUAS::CONSTANT_BUFFER_5:
return 512 + 4096 * 5;
case AMDGPUAS::CONSTANT_BUFFER_6:
return 512 + 4096 * 6;
case AMDGPUAS::CONSTANT_BUFFER_7:
return 512 + 4096 * 7;
case AMDGPUAS::CONSTANT_BUFFER_8:
return 512 + 4096 * 8;
case AMDGPUAS::CONSTANT_BUFFER_9:
return 512 + 4096 * 9;
case AMDGPUAS::CONSTANT_BUFFER_10:
return 512 + 4096 * 10;
case AMDGPUAS::CONSTANT_BUFFER_11:
return 512 + 4096 * 11;
case AMDGPUAS::CONSTANT_BUFFER_12:
return 512 + 4096 * 12;
case AMDGPUAS::CONSTANT_BUFFER_13:
return 512 + 4096 * 13;
case AMDGPUAS::CONSTANT_BUFFER_14:
return 512 + 4096 * 14;
case AMDGPUAS::CONSTANT_BUFFER_15:
return 512 + 4096 * 15;
default:
return -1;
}
}
SDValue R600TargetLowering::lowerPrivateExtLoad(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
LoadSDNode *Load = cast<LoadSDNode>(Op);
ISD::LoadExtType ExtType = Load->getExtensionType();
EVT MemVT = Load->getMemoryVT();
assert(Load->getAlignment() >= MemVT.getStoreSize());
SDValue BasePtr = Load->getBasePtr();
SDValue Chain = Load->getChain();
SDValue Offset = Load->getOffset();
SDValue LoadPtr = BasePtr;
if (!Offset.isUndef()) {
LoadPtr = DAG.getNode(ISD::ADD, DL, MVT::i32, BasePtr, Offset);
}
// Get dword location
// NOTE: this should be eliminated by the future SHR ptr, 2
SDValue Ptr = DAG.getNode(ISD::AND, DL, MVT::i32, LoadPtr,
DAG.getConstant(0xfffffffc, DL, MVT::i32));
// Load dword
// TODO: can we be smarter about machine pointer info?
MachinePointerInfo PtrInfo(AMDGPUAS::PRIVATE_ADDRESS);
SDValue Read = DAG.getLoad(MVT::i32, DL, Chain, Ptr, PtrInfo);
// Get offset within the register.
SDValue ByteIdx = DAG.getNode(ISD::AND, DL, MVT::i32,
LoadPtr, DAG.getConstant(0x3, DL, MVT::i32));
// Bit offset of target byte (byteIdx * 8).
SDValue ShiftAmt = DAG.getNode(ISD::SHL, DL, MVT::i32, ByteIdx,
DAG.getConstant(3, DL, MVT::i32));
// Shift to the right.
SDValue Ret = DAG.getNode(ISD::SRL, DL, MVT::i32, Read, ShiftAmt);
// Eliminate the upper bits by setting them to ...
EVT MemEltVT = MemVT.getScalarType();
if (ExtType == ISD::SEXTLOAD) { // ... ones.
SDValue MemEltVTNode = DAG.getValueType(MemEltVT);
Ret = DAG.getNode(ISD::SIGN_EXTEND_INREG, DL, MVT::i32, Ret, MemEltVTNode);
} else { // ... or zeros.
Ret = DAG.getZeroExtendInReg(Ret, DL, MemEltVT);
}
SDValue Ops[] = {
Ret,
Read.getValue(1) // This should be our output chain
};
return DAG.getMergeValues(Ops, DL);
}
SDValue R600TargetLowering::LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
LoadSDNode *LoadNode = cast<LoadSDNode>(Op);
unsigned AS = LoadNode->getAddressSpace();
EVT MemVT = LoadNode->getMemoryVT();
ISD::LoadExtType ExtType = LoadNode->getExtensionType();
if (AS == AMDGPUAS::PRIVATE_ADDRESS &&
ExtType != ISD::NON_EXTLOAD && MemVT.bitsLT(MVT::i32)) {
return lowerPrivateExtLoad(Op, DAG);
}
SDLoc DL(Op);
EVT VT = Op.getValueType();
SDValue Chain = LoadNode->getChain();
SDValue Ptr = LoadNode->getBasePtr();
if ((LoadNode->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS ||
LoadNode->getAddressSpace() == AMDGPUAS::PRIVATE_ADDRESS) &&
VT.isVector()) {
SDValue Ops[2];
std::tie(Ops[0], Ops[1]) = scalarizeVectorLoad(LoadNode, DAG);
return DAG.getMergeValues(Ops, DL);
}
// This is still used for explicit load from addrspace(8)
int ConstantBlock = ConstantAddressBlock(LoadNode->getAddressSpace());
if (ConstantBlock > -1 &&
((LoadNode->getExtensionType() == ISD::NON_EXTLOAD) ||
(LoadNode->getExtensionType() == ISD::ZEXTLOAD))) {
SDValue Result;
if (isa<Constant>(LoadNode->getMemOperand()->getValue()) ||
isa<ConstantSDNode>(Ptr)) {
return constBufferLoad(LoadNode, LoadNode->getAddressSpace(), DAG);
} else {
//TODO: Does this even work?
// non-constant ptr can't be folded, keeps it as a v4f32 load
Result = DAG.getNode(AMDGPUISD::CONST_ADDRESS, DL, MVT::v4i32,
DAG.getNode(ISD::SRL, DL, MVT::i32, Ptr,
DAG.getConstant(4, DL, MVT::i32)),
DAG.getConstant(LoadNode->getAddressSpace() -
AMDGPUAS::CONSTANT_BUFFER_0, DL, MVT::i32)
);
}
if (!VT.isVector()) {
Result = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, Result,
DAG.getConstant(0, DL, MVT::i32));
}
SDValue MergedValues[2] = {
Result,
Chain
};
return DAG.getMergeValues(MergedValues, DL);
}
// For most operations returning SDValue() will result in the node being
// expanded by the DAG Legalizer. This is not the case for ISD::LOAD, so we
// need to manually expand loads that may be legal in some address spaces and
// illegal in others. SEXT loads from CONSTANT_BUFFER_0 are supported for
// compute shaders, since the data is sign extended when it is uploaded to the
// buffer. However SEXT loads from other address spaces are not supported, so
// we need to expand them here.
if (LoadNode->getExtensionType() == ISD::SEXTLOAD) {
assert(!MemVT.isVector() && (MemVT == MVT::i16 || MemVT == MVT::i8));
SDValue NewLoad = DAG.getExtLoad(
ISD::EXTLOAD, DL, VT, Chain, Ptr, LoadNode->getPointerInfo(), MemVT,
LoadNode->getAlignment(), LoadNode->getMemOperand()->getFlags());
SDValue Res = DAG.getNode(ISD::SIGN_EXTEND_INREG, DL, VT, NewLoad,
DAG.getValueType(MemVT));
SDValue MergedValues[2] = { Res, Chain };
return DAG.getMergeValues(MergedValues, DL);
}
if (LoadNode->getAddressSpace() != AMDGPUAS::PRIVATE_ADDRESS) {
return SDValue();
}
// DWORDADDR ISD marks already shifted address
if (Ptr.getOpcode() != AMDGPUISD::DWORDADDR) {
assert(VT == MVT::i32);
Ptr = DAG.getNode(ISD::SRL, DL, MVT::i32, Ptr, DAG.getConstant(2, DL, MVT::i32));
Ptr = DAG.getNode(AMDGPUISD::DWORDADDR, DL, MVT::i32, Ptr);
return DAG.getLoad(MVT::i32, DL, Chain, Ptr, LoadNode->getMemOperand());
}
return SDValue();
}
SDValue R600TargetLowering::LowerBRCOND(SDValue Op, SelectionDAG &DAG) const {
SDValue Chain = Op.getOperand(0);
SDValue Cond = Op.getOperand(1);
SDValue Jump = Op.getOperand(2);
return DAG.getNode(AMDGPUISD::BRANCH_COND, SDLoc(Op), Op.getValueType(),
Chain, Jump, Cond);
}
SDValue R600TargetLowering::lowerFrameIndex(SDValue Op,
SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
const R600FrameLowering *TFL = Subtarget->getFrameLowering();
FrameIndexSDNode *FIN = cast<FrameIndexSDNode>(Op);
unsigned FrameIndex = FIN->getIndex();
Register IgnoredFrameReg;
StackOffset Offset =
TFL->getFrameIndexReference(MF, FrameIndex, IgnoredFrameReg);
return DAG.getConstant(Offset.getFixed() * 4 * TFL->getStackWidth(MF),
SDLoc(Op), Op.getValueType());
}
CCAssignFn *R600TargetLowering::CCAssignFnForCall(CallingConv::ID CC,
bool IsVarArg) const {
switch (CC) {
case CallingConv::AMDGPU_KERNEL:
case CallingConv::SPIR_KERNEL:
case CallingConv::C:
case CallingConv::Fast:
case CallingConv::Cold:
llvm_unreachable("kernels should not be handled here");
case CallingConv::AMDGPU_VS:
case CallingConv::AMDGPU_GS:
case CallingConv::AMDGPU_PS:
case CallingConv::AMDGPU_CS:
case CallingConv::AMDGPU_HS:
case CallingConv::AMDGPU_ES:
case CallingConv::AMDGPU_LS:
return CC_R600;
default:
report_fatal_error("Unsupported calling convention.");
}
}
/// XXX Only kernel functions are supported, so we can assume for now that
/// every function is a kernel function, but in the future we should use
/// separate calling conventions for kernel and non-kernel functions.
SDValue R600TargetLowering::LowerFormalArguments(
SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &DL,
SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs,
*DAG.getContext());
MachineFunction &MF = DAG.getMachineFunction();
SmallVector<ISD::InputArg, 8> LocalIns;
if (AMDGPU::isShader(CallConv)) {
CCInfo.AnalyzeFormalArguments(Ins, CCAssignFnForCall(CallConv, isVarArg));
} else {
analyzeFormalArgumentsCompute(CCInfo, Ins);
}
for (unsigned i = 0, e = Ins.size(); i < e; ++i) {
CCValAssign &VA = ArgLocs[i];
const ISD::InputArg &In = Ins[i];
EVT VT = In.VT;
EVT MemVT = VA.getLocVT();
if (!VT.isVector() && MemVT.isVector()) {
// Get load source type if scalarized.
MemVT = MemVT.getVectorElementType();
}
if (AMDGPU::isShader(CallConv)) {
Register Reg = MF.addLiveIn(VA.getLocReg(), &R600::R600_Reg128RegClass);
SDValue Register = DAG.getCopyFromReg(Chain, DL, Reg, VT);
InVals.push_back(Register);
continue;
}
// i64 isn't a legal type, so the register type used ends up as i32, which
// isn't expected here. It attempts to create this sextload, but it ends up
// being invalid. Somehow this seems to work with i64 arguments, but breaks
// for <1 x i64>.
// The first 36 bytes of the input buffer contains information about
// thread group and global sizes.
ISD::LoadExtType Ext = ISD::NON_EXTLOAD;
if (MemVT.getScalarSizeInBits() != VT.getScalarSizeInBits()) {
// FIXME: This should really check the extload type, but the handling of
// extload vector parameters seems to be broken.
// Ext = In.Flags.isSExt() ? ISD::SEXTLOAD : ISD::ZEXTLOAD;
Ext = ISD::SEXTLOAD;
}
// Compute the offset from the value.
// XXX - I think PartOffset should give you this, but it seems to give the
// size of the register which isn't useful.
unsigned PartOffset = VA.getLocMemOffset();
unsigned Alignment = MinAlign(VT.getStoreSize(), PartOffset);
MachinePointerInfo PtrInfo(AMDGPUAS::PARAM_I_ADDRESS);
SDValue Arg = DAG.getLoad(
ISD::UNINDEXED, Ext, VT, DL, Chain,
DAG.getConstant(PartOffset, DL, MVT::i32), DAG.getUNDEF(MVT::i32),
PtrInfo,
MemVT, Alignment, MachineMemOperand::MONonTemporal |
MachineMemOperand::MODereferenceable |
MachineMemOperand::MOInvariant);
InVals.push_back(Arg);
}
return Chain;
}
EVT R600TargetLowering::getSetCCResultType(const DataLayout &DL, LLVMContext &,
EVT VT) const {
if (!VT.isVector())
return MVT::i32;
return VT.changeVectorElementTypeToInteger();
}
bool R600TargetLowering::canMergeStoresTo(unsigned AS, EVT MemVT,
const SelectionDAG &DAG) const {
// Local and Private addresses do not handle vectors. Limit to i32
if ((AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::PRIVATE_ADDRESS)) {
return (MemVT.getSizeInBits() <= 32);
}
return true;
}
bool R600TargetLowering::allowsMisalignedMemoryAccesses(
EVT VT, unsigned AddrSpace, unsigned Align, MachineMemOperand::Flags Flags,
bool *IsFast) const {
if (IsFast)
*IsFast = false;
if (!VT.isSimple() || VT == MVT::Other)
return false;
if (VT.bitsLT(MVT::i32))
return false;
// TODO: This is a rough estimate.
if (IsFast)
*IsFast = true;
return VT.bitsGT(MVT::i32) && Align % 4 == 0;
}
static SDValue CompactSwizzlableVector(
SelectionDAG &DAG, SDValue VectorEntry,
DenseMap<unsigned, unsigned> &RemapSwizzle) {
assert(RemapSwizzle.empty());
SDLoc DL(VectorEntry);
EVT EltTy = VectorEntry.getValueType().getVectorElementType();
SDValue NewBldVec[4];
for (unsigned i = 0; i < 4; i++)
NewBldVec[i] = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, EltTy, VectorEntry,
DAG.getIntPtrConstant(i, DL));
for (unsigned i = 0; i < 4; i++) {
if (NewBldVec[i].isUndef())
// We mask write here to teach later passes that the ith element of this
// vector is undef. Thus we can use it to reduce 128 bits reg usage,
// break false dependencies and additionnaly make assembly easier to read.
RemapSwizzle[i] = 7; // SEL_MASK_WRITE
if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(NewBldVec[i])) {
if (C->isZero()) {
RemapSwizzle[i] = 4; // SEL_0
NewBldVec[i] = DAG.getUNDEF(MVT::f32);
} else if (C->isExactlyValue(1.0)) {
RemapSwizzle[i] = 5; // SEL_1
NewBldVec[i] = DAG.getUNDEF(MVT::f32);
}
}
if (NewBldVec[i].isUndef())
continue;
for (unsigned j = 0; j < i; j++) {
if (NewBldVec[i] == NewBldVec[j]) {
NewBldVec[i] = DAG.getUNDEF(NewBldVec[i].getValueType());
RemapSwizzle[i] = j;
break;
}
}
}
return DAG.getBuildVector(VectorEntry.getValueType(), SDLoc(VectorEntry),
NewBldVec);
}
static SDValue ReorganizeVector(SelectionDAG &DAG, SDValue VectorEntry,
DenseMap<unsigned, unsigned> &RemapSwizzle) {
assert(RemapSwizzle.empty());
SDLoc DL(VectorEntry);
EVT EltTy = VectorEntry.getValueType().getVectorElementType();
SDValue NewBldVec[4];
bool isUnmovable[4] = {false, false, false, false};
for (unsigned i = 0; i < 4; i++)
NewBldVec[i] = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, EltTy, VectorEntry,
DAG.getIntPtrConstant(i, DL));
for (unsigned i = 0; i < 4; i++) {
RemapSwizzle[i] = i;
if (NewBldVec[i].getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
unsigned Idx = cast<ConstantSDNode>(NewBldVec[i].getOperand(1))
->getZExtValue();
if (i == Idx)
isUnmovable[Idx] = true;
}
}
for (unsigned i = 0; i < 4; i++) {
if (NewBldVec[i].getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
unsigned Idx = cast<ConstantSDNode>(NewBldVec[i].getOperand(1))
->getZExtValue();
if (isUnmovable[Idx])
continue;
// Swap i and Idx
std::swap(NewBldVec[Idx], NewBldVec[i]);
std::swap(RemapSwizzle[i], RemapSwizzle[Idx]);
break;
}
}
return DAG.getBuildVector(VectorEntry.getValueType(), SDLoc(VectorEntry),
NewBldVec);
}
SDValue R600TargetLowering::OptimizeSwizzle(SDValue BuildVector, SDValue Swz[4],
SelectionDAG &DAG,
const SDLoc &DL) const {
// Old -> New swizzle values
DenseMap<unsigned, unsigned> SwizzleRemap;
BuildVector = CompactSwizzlableVector(DAG, BuildVector, SwizzleRemap);
for (unsigned i = 0; i < 4; i++) {
unsigned Idx = cast<ConstantSDNode>(Swz[i])->getZExtValue();
if (SwizzleRemap.find(Idx) != SwizzleRemap.end())
Swz[i] = DAG.getConstant(SwizzleRemap[Idx], DL, MVT::i32);
}
SwizzleRemap.clear();
BuildVector = ReorganizeVector(DAG, BuildVector, SwizzleRemap);
for (unsigned i = 0; i < 4; i++) {
unsigned Idx = cast<ConstantSDNode>(Swz[i])->getZExtValue();
if (SwizzleRemap.find(Idx) != SwizzleRemap.end())
Swz[i] = DAG.getConstant(SwizzleRemap[Idx], DL, MVT::i32);
}
return BuildVector;
}
SDValue R600TargetLowering::constBufferLoad(LoadSDNode *LoadNode, int Block,
SelectionDAG &DAG) const {
SDLoc DL(LoadNode);
EVT VT = LoadNode->getValueType(0);
SDValue Chain = LoadNode->getChain();
SDValue Ptr = LoadNode->getBasePtr();
assert (isa<ConstantSDNode>(Ptr));
//TODO: Support smaller loads
if (LoadNode->getMemoryVT().getScalarType() != MVT::i32 || !ISD::isNON_EXTLoad(LoadNode))
return SDValue();
if (LoadNode->getAlignment() < 4)
return SDValue();
int ConstantBlock = ConstantAddressBlock(Block);
SDValue Slots[4];
for (unsigned i = 0; i < 4; i++) {
// We want Const position encoded with the following formula :
// (((512 + (kc_bank << 12) + const_index) << 2) + chan)
// const_index is Ptr computed by llvm using an alignment of 16.
// Thus we add (((512 + (kc_bank << 12)) + chan ) * 4 here and
// then div by 4 at the ISel step
SDValue NewPtr = DAG.getNode(ISD::ADD, DL, Ptr.getValueType(), Ptr,
DAG.getConstant(4 * i + ConstantBlock * 16, DL, MVT::i32));
Slots[i] = DAG.getNode(AMDGPUISD::CONST_ADDRESS, DL, MVT::i32, NewPtr);
}
EVT NewVT = MVT::v4i32;
unsigned NumElements = 4;
if (VT.isVector()) {
NewVT = VT;
NumElements = VT.getVectorNumElements();
}
SDValue Result = DAG.getBuildVector(NewVT, DL, makeArrayRef(Slots, NumElements));
if (!VT.isVector()) {
Result = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::i32, Result,
DAG.getConstant(0, DL, MVT::i32));
}
SDValue MergedValues[2] = {
Result,
Chain
};
return DAG.getMergeValues(MergedValues, DL);
}
//===----------------------------------------------------------------------===//
// Custom DAG Optimizations
//===----------------------------------------------------------------------===//
SDValue R600TargetLowering::PerformDAGCombine(SDNode *N,
DAGCombinerInfo &DCI) const {
SelectionDAG &DAG = DCI.DAG;
SDLoc DL(N);
switch (N->getOpcode()) {
// (f32 fp_round (f64 uint_to_fp a)) -> (f32 uint_to_fp a)
case ISD::FP_ROUND: {
SDValue Arg = N->getOperand(0);
if (Arg.getOpcode() == ISD::UINT_TO_FP && Arg.getValueType() == MVT::f64) {
return DAG.getNode(ISD::UINT_TO_FP, DL, N->getValueType(0),
Arg.getOperand(0));
}
break;
}
// (i32 fp_to_sint (fneg (select_cc f32, f32, 1.0, 0.0 cc))) ->
// (i32 select_cc f32, f32, -1, 0 cc)
//
// Mesa's GLSL frontend generates the above pattern a lot and we can lower
// this to one of the SET*_DX10 instructions.
case ISD::FP_TO_SINT: {
SDValue FNeg = N->getOperand(0);
if (FNeg.getOpcode() != ISD::FNEG) {
return SDValue();
}
SDValue SelectCC = FNeg.getOperand(0);
if (SelectCC.getOpcode() != ISD::SELECT_CC ||
SelectCC.getOperand(0).getValueType() != MVT::f32 || // LHS
SelectCC.getOperand(2).getValueType() != MVT::f32 || // True
!isHWTrueValue(SelectCC.getOperand(2)) ||
!isHWFalseValue(SelectCC.getOperand(3))) {
return SDValue();
}
return DAG.getNode(ISD::SELECT_CC, DL, N->getValueType(0),
SelectCC.getOperand(0), // LHS
SelectCC.getOperand(1), // RHS
DAG.getConstant(-1, DL, MVT::i32), // True
DAG.getConstant(0, DL, MVT::i32), // False
SelectCC.getOperand(4)); // CC
}
// insert_vector_elt (build_vector elt0, ... , eltN), NewEltIdx, idx
// => build_vector elt0, ... , NewEltIdx, ... , eltN
case ISD::INSERT_VECTOR_ELT: {
SDValue InVec = N->getOperand(0);
SDValue InVal = N->getOperand(1);
SDValue EltNo = N->getOperand(2);
// If the inserted element is an UNDEF, just use the input vector.
if (InVal.isUndef())
return InVec;
EVT VT = InVec.getValueType();
// If we can't generate a legal BUILD_VECTOR, exit
if (!isOperationLegal(ISD::BUILD_VECTOR, VT))
return SDValue();
// Check that we know which element is being inserted
if (!isa<ConstantSDNode>(EltNo))
return SDValue();
unsigned Elt = cast<ConstantSDNode>(EltNo)->getZExtValue();
// Check that the operand is a BUILD_VECTOR (or UNDEF, which can essentially
// be converted to a BUILD_VECTOR). Fill in the Ops vector with the
// vector elements.
SmallVector<SDValue, 8> Ops;
if (InVec.getOpcode() == ISD::BUILD_VECTOR) {
Ops.append(InVec.getNode()->op_begin(),
InVec.getNode()->op_end());
} else if (InVec.isUndef()) {
unsigned NElts = VT.getVectorNumElements();
Ops.append(NElts, DAG.getUNDEF(InVal.getValueType()));
} else {
return SDValue();
}
// Insert the element
if (Elt < Ops.size()) {
// All the operands of BUILD_VECTOR must have the same type;
// we enforce that here.
EVT OpVT = Ops[0].getValueType();
if (InVal.getValueType() != OpVT)
InVal = OpVT.bitsGT(InVal.getValueType()) ?
DAG.getNode(ISD::ANY_EXTEND, DL, OpVT, InVal) :
DAG.getNode(ISD::TRUNCATE, DL, OpVT, InVal);
Ops[Elt] = InVal;
}
// Return the new vector
return DAG.getBuildVector(VT, DL, Ops);
}
// Extract_vec (Build_vector) generated by custom lowering
// also needs to be customly combined
case ISD::EXTRACT_VECTOR_ELT: {
SDValue Arg = N->getOperand(0);
if (Arg.getOpcode() == ISD::BUILD_VECTOR) {
if (ConstantSDNode *Const = dyn_cast<ConstantSDNode>(N->getOperand(1))) {
unsigned Element = Const->getZExtValue();
return Arg->getOperand(Element);
}
}
if (Arg.getOpcode() == ISD::BITCAST &&
Arg.getOperand(0).getOpcode() == ISD::BUILD_VECTOR &&
(Arg.getOperand(0).getValueType().getVectorNumElements() ==
Arg.getValueType().getVectorNumElements())) {
if (ConstantSDNode *Const = dyn_cast<ConstantSDNode>(N->getOperand(1))) {
unsigned Element = Const->getZExtValue();
return DAG.getNode(ISD::BITCAST, DL, N->getVTList(),
Arg->getOperand(0).getOperand(Element));
}
}
break;
}
case ISD::SELECT_CC: {
// Try common optimizations
if (SDValue Ret = AMDGPUTargetLowering::PerformDAGCombine(N, DCI))
return Ret;
// fold selectcc (selectcc x, y, a, b, cc), b, a, b, seteq ->
// selectcc x, y, a, b, inv(cc)
//
// fold selectcc (selectcc x, y, a, b, cc), b, a, b, setne ->
// selectcc x, y, a, b, cc
SDValue LHS = N->getOperand(0);
if (LHS.getOpcode() != ISD::SELECT_CC) {
return SDValue();
}
SDValue RHS = N->getOperand(1);
SDValue True = N->getOperand(2);
SDValue False = N->getOperand(3);
ISD::CondCode NCC = cast<CondCodeSDNode>(N->getOperand(4))->get();
if (LHS.getOperand(2).getNode() != True.getNode() ||
LHS.getOperand(3).getNode() != False.getNode() ||
RHS.getNode() != False.getNode()) {
return SDValue();
}
switch (NCC) {
default: return SDValue();
case ISD::SETNE: return LHS;
case ISD::SETEQ: {
ISD::CondCode LHSCC = cast<CondCodeSDNode>(LHS.getOperand(4))->get();
LHSCC = ISD::getSetCCInverse(LHSCC, LHS.getOperand(0).getValueType());
if (DCI.isBeforeLegalizeOps() ||
isCondCodeLegal(LHSCC, LHS.getOperand(0).getSimpleValueType()))
return DAG.getSelectCC(DL,
LHS.getOperand(0),
LHS.getOperand(1),
LHS.getOperand(2),
LHS.getOperand(3),
LHSCC);
break;
}
}
return SDValue();
}
case AMDGPUISD::R600_EXPORT: {
SDValue Arg = N->getOperand(1);
if (Arg.getOpcode() != ISD::BUILD_VECTOR)
break;
SDValue NewArgs[8] = {
N->getOperand(0), // Chain
SDValue(),
N->getOperand(2), // ArrayBase
N->getOperand(3), // Type
N->getOperand(4), // SWZ_X
N->getOperand(5), // SWZ_Y
N->getOperand(6), // SWZ_Z
N->getOperand(7) // SWZ_W
};
NewArgs[1] = OptimizeSwizzle(N->getOperand(1), &NewArgs[4], DAG, DL);
return DAG.getNode(AMDGPUISD::R600_EXPORT, DL, N->getVTList(), NewArgs);
}
case AMDGPUISD::TEXTURE_FETCH: {
SDValue Arg = N->getOperand(1);
if (Arg.getOpcode() != ISD::BUILD_VECTOR)
break;
SDValue NewArgs[19] = {
N->getOperand(0),
N->getOperand(1),
N->getOperand(2),
N->getOperand(3),
N->getOperand(4),
N->getOperand(5),
N->getOperand(6),
N->getOperand(7),
N->getOperand(8),
N->getOperand(9),
N->getOperand(10),
N->getOperand(11),
N->getOperand(12),
N->getOperand(13),
N->getOperand(14),
N->getOperand(15),
N->getOperand(16),
N->getOperand(17),
N->getOperand(18),
};
NewArgs[1] = OptimizeSwizzle(N->getOperand(1), &NewArgs[2], DAG, DL);
return DAG.getNode(AMDGPUISD::TEXTURE_FETCH, DL, N->getVTList(), NewArgs);
}
case ISD::LOAD: {
LoadSDNode *LoadNode = cast<LoadSDNode>(N);
SDValue Ptr = LoadNode->getBasePtr();
if (LoadNode->getAddressSpace() == AMDGPUAS::PARAM_I_ADDRESS &&
isa<ConstantSDNode>(Ptr))
return constBufferLoad(LoadNode, AMDGPUAS::CONSTANT_BUFFER_0, DAG);
break;
}
default: break;
}
return AMDGPUTargetLowering::PerformDAGCombine(N, DCI);
}
bool R600TargetLowering::FoldOperand(SDNode *ParentNode, unsigned SrcIdx,
SDValue &Src, SDValue &Neg, SDValue &Abs,
SDValue &Sel, SDValue &Imm,
SelectionDAG &DAG) const {
const R600InstrInfo *TII = Subtarget->getInstrInfo();
if (!Src.isMachineOpcode())
return false;
switch (Src.getMachineOpcode()) {
case R600::FNEG_R600:
if (!Neg.getNode())
return false;
Src = Src.getOperand(0);
Neg = DAG.getTargetConstant(1, SDLoc(ParentNode), MVT::i32);
return true;
case R600::FABS_R600:
if (!Abs.getNode())
return false;
Src = Src.getOperand(0);
Abs = DAG.getTargetConstant(1, SDLoc(ParentNode), MVT::i32);
return true;
case R600::CONST_COPY: {
unsigned Opcode = ParentNode->getMachineOpcode();
bool HasDst = TII->getOperandIdx(Opcode, R600::OpName::dst) > -1;
if (!Sel.getNode())
return false;
SDValue CstOffset = Src.getOperand(0);
if (ParentNode->getValueType(0).isVector())
return false;
// Gather constants values
int SrcIndices[] = {
TII->getOperandIdx(Opcode, R600::OpName::src0),
TII->getOperandIdx(Opcode, R600::OpName::src1),
TII->getOperandIdx(Opcode, R600::OpName::src2),
TII->getOperandIdx(Opcode, R600::OpName::src0_X),
TII->getOperandIdx(Opcode, R600::OpName::src0_Y),
TII->getOperandIdx(Opcode, R600::OpName::src0_Z),
TII->getOperandIdx(Opcode, R600::OpName::src0_W),
TII->getOperandIdx(Opcode, R600::OpName::src1_X),
TII->getOperandIdx(Opcode, R600::OpName::src1_Y),
TII->getOperandIdx(Opcode, R600::OpName::src1_Z),
TII->getOperandIdx(Opcode, R600::OpName::src1_W)
};
std::vector<unsigned> Consts;
for (int OtherSrcIdx : SrcIndices) {
int OtherSelIdx = TII->getSelIdx(Opcode, OtherSrcIdx);
if (OtherSrcIdx < 0 || OtherSelIdx < 0)
continue;
if (HasDst) {
OtherSrcIdx--;
OtherSelIdx--;
}
if (RegisterSDNode *Reg =
dyn_cast<RegisterSDNode>(ParentNode->getOperand(OtherSrcIdx))) {
if (Reg->getReg() == R600::ALU_CONST) {
ConstantSDNode *Cst
= cast<ConstantSDNode>(ParentNode->getOperand(OtherSelIdx));
Consts.push_back(Cst->getZExtValue());
}
}
}
ConstantSDNode *Cst = cast<ConstantSDNode>(CstOffset);
Consts.push_back(Cst->getZExtValue());
if (!TII->fitsConstReadLimitations(Consts)) {
return false;
}
Sel = CstOffset;
Src = DAG.getRegister(R600::ALU_CONST, MVT::f32);
return true;
}
case R600::MOV_IMM_GLOBAL_ADDR:
// Check if the Imm slot is used. Taken from below.
if (cast<ConstantSDNode>(Imm)->getZExtValue())
return false;
Imm = Src.getOperand(0);
Src = DAG.getRegister(R600::ALU_LITERAL_X, MVT::i32);
return true;
case R600::MOV_IMM_I32:
case R600::MOV_IMM_F32: {
unsigned ImmReg = R600::ALU_LITERAL_X;
uint64_t ImmValue = 0;
if (Src.getMachineOpcode() == R600::MOV_IMM_F32) {
ConstantFPSDNode *FPC = cast<ConstantFPSDNode>(Src.getOperand(0));
float FloatValue = FPC->getValueAPF().convertToFloat();
if (FloatValue == 0.0) {
ImmReg = R600::ZERO;
} else if (FloatValue == 0.5) {
ImmReg = R600::HALF;
} else if (FloatValue == 1.0) {
ImmReg = R600::ONE;
} else {
ImmValue = FPC->getValueAPF().bitcastToAPInt().getZExtValue();
}
} else {
ConstantSDNode *C = cast<ConstantSDNode>(Src.getOperand(0));
uint64_t Value = C->getZExtValue();
if (Value == 0) {
ImmReg = R600::ZERO;
} else if (Value == 1) {
ImmReg = R600::ONE_INT;
} else {
ImmValue = Value;
}
}
// Check that we aren't already using an immediate.
// XXX: It's possible for an instruction to have more than one
// immediate operand, but this is not supported yet.
if (ImmReg == R600::ALU_LITERAL_X) {
if (!Imm.getNode())
return false;
ConstantSDNode *C = cast<ConstantSDNode>(Imm);
if (C->getZExtValue())
return false;
Imm = DAG.getTargetConstant(ImmValue, SDLoc(ParentNode), MVT::i32);
}
Src = DAG.getRegister(ImmReg, MVT::i32);
return true;
}
default:
return false;
}
}
/// Fold the instructions after selecting them
SDNode *R600TargetLowering::PostISelFolding(MachineSDNode *Node,
SelectionDAG &DAG) const {
const R600InstrInfo *TII = Subtarget->getInstrInfo();
if (!Node->isMachineOpcode())
return Node;
unsigned Opcode = Node->getMachineOpcode();
SDValue FakeOp;
std::vector<SDValue> Ops(Node->op_begin(), Node->op_end());
if (Opcode == R600::DOT_4) {
int OperandIdx[] = {
TII->getOperandIdx(Opcode, R600::OpName::src0_X),
TII->getOperandIdx(Opcode, R600::OpName::src0_Y),
TII->getOperandIdx(Opcode, R600::OpName::src0_Z),
TII->getOperandIdx(Opcode, R600::OpName::src0_W),
TII->getOperandIdx(Opcode, R600::OpName::src1_X),
TII->getOperandIdx(Opcode, R600::OpName::src1_Y),
TII->getOperandIdx(Opcode, R600::OpName::src1_Z),
TII->getOperandIdx(Opcode, R600::OpName::src1_W)
};
int NegIdx[] = {
TII->getOperandIdx(Opcode, R600::OpName::src0_neg_X),
TII->getOperandIdx(Opcode, R600::OpName::src0_neg_Y),
TII->getOperandIdx(Opcode, R600::OpName::src0_neg_Z),
TII->getOperandIdx(Opcode, R600::OpName::src0_neg_W),
TII->getOperandIdx(Opcode, R600::OpName::src1_neg_X),
TII->getOperandIdx(Opcode, R600::OpName::src1_neg_Y),
TII->getOperandIdx(Opcode, R600::OpName::src1_neg_Z),
TII->getOperandIdx(Opcode, R600::OpName::src1_neg_W)
};
int AbsIdx[] = {
TII->getOperandIdx(Opcode, R600::OpName::src0_abs_X),
TII->getOperandIdx(Opcode, R600::OpName::src0_abs_Y),
TII->getOperandIdx(Opcode, R600::OpName::src0_abs_Z),
TII->getOperandIdx(Opcode, R600::OpName::src0_abs_W),
TII->getOperandIdx(Opcode, R600::OpName::src1_abs_X),
TII->getOperandIdx(Opcode, R600::OpName::src1_abs_Y),
TII->getOperandIdx(Opcode, R600::OpName::src1_abs_Z),
TII->getOperandIdx(Opcode, R600::OpName::src1_abs_W)
};
for (unsigned i = 0; i < 8; i++) {
if (OperandIdx[i] < 0)
return Node;
SDValue &Src = Ops[OperandIdx[i] - 1];
SDValue &Neg = Ops[NegIdx[i] - 1];
SDValue &Abs = Ops[AbsIdx[i] - 1];
bool HasDst = TII->getOperandIdx(Opcode, R600::OpName::dst) > -1;
int SelIdx = TII->getSelIdx(Opcode, OperandIdx[i]);
if (HasDst)
SelIdx--;
SDValue &Sel = (SelIdx > -1) ? Ops[SelIdx] : FakeOp;
if (FoldOperand(Node, i, Src, Neg, Abs, Sel, FakeOp, DAG))
return DAG.getMachineNode(Opcode, SDLoc(Node), Node->getVTList(), Ops);
}
} else if (Opcode == R600::REG_SEQUENCE) {
for (unsigned i = 1, e = Node->getNumOperands(); i < e; i += 2) {
SDValue &Src = Ops[i];
if (FoldOperand(Node, i, Src, FakeOp, FakeOp, FakeOp, FakeOp, DAG))
return DAG.getMachineNode(Opcode, SDLoc(Node), Node->getVTList(), Ops);
}
} else {
if (!TII->hasInstrModifiers(Opcode))
return Node;
int OperandIdx[] = {
TII->getOperandIdx(Opcode, R600::OpName::src0),
TII->getOperandIdx(Opcode, R600::OpName::src1),
TII->getOperandIdx(Opcode, R600::OpName::src2)
};
int NegIdx[] = {
TII->getOperandIdx(Opcode, R600::OpName::src0_neg),
TII->getOperandIdx(Opcode, R600::OpName::src1_neg),
TII->getOperandIdx(Opcode, R600::OpName::src2_neg)
};
int AbsIdx[] = {
TII->getOperandIdx(Opcode, R600::OpName::src0_abs),
TII->getOperandIdx(Opcode, R600::OpName::src1_abs),
-1
};
for (unsigned i = 0; i < 3; i++) {
if (OperandIdx[i] < 0)
return Node;
SDValue &Src = Ops[OperandIdx[i] - 1];
SDValue &Neg = Ops[NegIdx[i] - 1];
SDValue FakeAbs;
SDValue &Abs = (AbsIdx[i] > -1) ? Ops[AbsIdx[i] - 1] : FakeAbs;
bool HasDst = TII->getOperandIdx(Opcode, R600::OpName::dst) > -1;
int SelIdx = TII->getSelIdx(Opcode, OperandIdx[i]);
int ImmIdx = TII->getOperandIdx(Opcode, R600::OpName::literal);
if (HasDst) {
SelIdx--;
ImmIdx--;
}
SDValue &Sel = (SelIdx > -1) ? Ops[SelIdx] : FakeOp;
SDValue &Imm = Ops[ImmIdx];
if (FoldOperand(Node, i, Src, Neg, Abs, Sel, Imm, DAG))
return DAG.getMachineNode(Opcode, SDLoc(Node), Node->getVTList(), Ops);
}
}
return Node;
}