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llvm-mirror/lib/Target/R600/AMDGPUISelDAGToDAG.cpp
Matt Arsenault 52e8d9b98d R600/SI: Fix selection failure on scalar_to_vector 
There seem to be only 2 places that produce these,
and it's kind of tricky to hit them.

Also fixes failure to bitcast between i64 and v2f32,
although this for some reason wasn't actually broken in the
simple bitcast testcase, but did in the scalar_to_vector one.

llvm-svn: 210664
2014-06-11 17:40:32 +00:00

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//===-- AMDILISelDAGToDAG.cpp - A dag to dag inst selector for AMDIL ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//==-----------------------------------------------------------------------===//
//
/// \file
/// \brief Defines an instruction selector for the AMDGPU target.
//
//===----------------------------------------------------------------------===//
#include "AMDGPUInstrInfo.h"
#include "AMDGPUISelLowering.h" // For AMDGPUISD
#include "AMDGPURegisterInfo.h"
#include "R600InstrInfo.h"
#include "SIISelLowering.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/IR/Function.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Instruction Selector Implementation
//===----------------------------------------------------------------------===//
namespace {
/// AMDGPU specific code to select AMDGPU machine instructions for
/// SelectionDAG operations.
class AMDGPUDAGToDAGISel : public SelectionDAGISel {
// Subtarget - Keep a pointer to the AMDGPU Subtarget around so that we can
// make the right decision when generating code for different targets.
const AMDGPUSubtarget &Subtarget;
public:
AMDGPUDAGToDAGISel(TargetMachine &TM);
virtual ~AMDGPUDAGToDAGISel();
SDNode *Select(SDNode *N) override;
const char *getPassName() const override;
void PostprocessISelDAG() override;
private:
bool isInlineImmediate(SDNode *N) const;
inline SDValue getSmallIPtrImm(unsigned Imm);
bool FoldOperand(SDValue &Src, SDValue &Sel, SDValue &Neg, SDValue &Abs,
const R600InstrInfo *TII);
bool FoldOperands(unsigned, const R600InstrInfo *, std::vector<SDValue> &);
bool FoldDotOperands(unsigned, const R600InstrInfo *, std::vector<SDValue> &);
// Complex pattern selectors
bool SelectADDRParam(SDValue Addr, SDValue& R1, SDValue& R2);
bool SelectADDR(SDValue N, SDValue &R1, SDValue &R2);
bool SelectADDR64(SDValue N, SDValue &R1, SDValue &R2);
static bool checkType(const Value *ptr, unsigned int addrspace);
static bool checkPrivateAddress(const MachineMemOperand *Op);
static bool isGlobalStore(const StoreSDNode *N);
static bool isPrivateStore(const StoreSDNode *N);
static bool isLocalStore(const StoreSDNode *N);
static bool isRegionStore(const StoreSDNode *N);
bool isCPLoad(const LoadSDNode *N) const;
bool isConstantLoad(const LoadSDNode *N, int cbID) const;
bool isGlobalLoad(const LoadSDNode *N) const;
bool isParamLoad(const LoadSDNode *N) const;
bool isPrivateLoad(const LoadSDNode *N) const;
bool isLocalLoad(const LoadSDNode *N) const;
bool isRegionLoad(const LoadSDNode *N) const;
/// \returns True if the current basic block being selected is at control
/// flow depth 0. Meaning that the current block dominates the
// exit block.
bool isCFDepth0() const;
const TargetRegisterClass *getOperandRegClass(SDNode *N, unsigned OpNo) const;
bool SelectGlobalValueConstantOffset(SDValue Addr, SDValue& IntPtr);
bool SelectGlobalValueVariableOffset(SDValue Addr, SDValue &BaseReg,
SDValue& Offset);
bool SelectADDRVTX_READ(SDValue Addr, SDValue &Base, SDValue &Offset);
bool SelectADDRIndirect(SDValue Addr, SDValue &Base, SDValue &Offset);
// Include the pieces autogenerated from the target description.
#include "AMDGPUGenDAGISel.inc"
};
} // end anonymous namespace
/// \brief This pass converts a legalized DAG into a AMDGPU-specific
// DAG, ready for instruction scheduling.
FunctionPass *llvm::createAMDGPUISelDag(TargetMachine &TM) {
return new AMDGPUDAGToDAGISel(TM);
}
AMDGPUDAGToDAGISel::AMDGPUDAGToDAGISel(TargetMachine &TM)
: SelectionDAGISel(TM), Subtarget(TM.getSubtarget<AMDGPUSubtarget>()) {
}
AMDGPUDAGToDAGISel::~AMDGPUDAGToDAGISel() {
}
bool AMDGPUDAGToDAGISel::isInlineImmediate(SDNode *N) const {
const SITargetLowering *TL
= static_cast<const SITargetLowering *>(getTargetLowering());
return TL->analyzeImmediate(N) == 0;
}
/// \brief Determine the register class for \p OpNo
/// \returns The register class of the virtual register that will be used for
/// the given operand number \OpNo or NULL if the register class cannot be
/// determined.
const TargetRegisterClass *AMDGPUDAGToDAGISel::getOperandRegClass(SDNode *N,
unsigned OpNo) const {
if (!N->isMachineOpcode())
return nullptr;
switch (N->getMachineOpcode()) {
default: {
const MCInstrDesc &Desc = TM.getInstrInfo()->get(N->getMachineOpcode());
unsigned OpIdx = Desc.getNumDefs() + OpNo;
if (OpIdx >= Desc.getNumOperands())
return nullptr;
int RegClass = Desc.OpInfo[OpIdx].RegClass;
if (RegClass == -1)
return nullptr;
return TM.getRegisterInfo()->getRegClass(RegClass);
}
case AMDGPU::REG_SEQUENCE: {
unsigned RCID = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
const TargetRegisterClass *SuperRC = TM.getRegisterInfo()->getRegClass(RCID);
SDValue SubRegOp = N->getOperand(OpNo + 1);
unsigned SubRegIdx = cast<ConstantSDNode>(SubRegOp)->getZExtValue();
return TM.getRegisterInfo()->getSubClassWithSubReg(SuperRC, SubRegIdx);
}
}
}
SDValue AMDGPUDAGToDAGISel::getSmallIPtrImm(unsigned int Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i32);
}
bool AMDGPUDAGToDAGISel::SelectADDRParam(
SDValue Addr, SDValue& R1, SDValue& R2) {
if (Addr.getOpcode() == ISD::FrameIndex) {
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
R1 = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
R2 = CurDAG->getTargetConstant(0, MVT::i32);
} else {
R1 = Addr;
R2 = CurDAG->getTargetConstant(0, MVT::i32);
}
} else if (Addr.getOpcode() == ISD::ADD) {
R1 = Addr.getOperand(0);
R2 = Addr.getOperand(1);
} else {
R1 = Addr;
R2 = CurDAG->getTargetConstant(0, MVT::i32);
}
return true;
}
bool AMDGPUDAGToDAGISel::SelectADDR(SDValue Addr, SDValue& R1, SDValue& R2) {
if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
Addr.getOpcode() == ISD::TargetGlobalAddress) {
return false;
}
return SelectADDRParam(Addr, R1, R2);
}
bool AMDGPUDAGToDAGISel::SelectADDR64(SDValue Addr, SDValue& R1, SDValue& R2) {
if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
Addr.getOpcode() == ISD::TargetGlobalAddress) {
return false;
}
if (Addr.getOpcode() == ISD::FrameIndex) {
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
R1 = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i64);
R2 = CurDAG->getTargetConstant(0, MVT::i64);
} else {
R1 = Addr;
R2 = CurDAG->getTargetConstant(0, MVT::i64);
}
} else if (Addr.getOpcode() == ISD::ADD) {
R1 = Addr.getOperand(0);
R2 = Addr.getOperand(1);
} else {
R1 = Addr;
R2 = CurDAG->getTargetConstant(0, MVT::i64);
}
return true;
}
SDNode *AMDGPUDAGToDAGISel::Select(SDNode *N) {
unsigned int Opc = N->getOpcode();
if (N->isMachineOpcode()) {
N->setNodeId(-1);
return nullptr; // Already selected.
}
const AMDGPUSubtarget &ST = TM.getSubtarget<AMDGPUSubtarget>();
switch (Opc) {
default: break;
// We are selecting i64 ADD here instead of custom lower it during
// DAG legalization, so we can fold some i64 ADDs used for address
// calculation into the LOAD and STORE instructions.
case ISD::ADD: {
if (N->getValueType(0) != MVT::i64 ||
ST.getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS)
break;
SDLoc DL(N);
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
SDValue Sub0 = CurDAG->getTargetConstant(AMDGPU::sub0, MVT::i32);
SDValue Sub1 = CurDAG->getTargetConstant(AMDGPU::sub1, MVT::i32);
SDNode *Lo0 = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG,
DL, MVT::i32, LHS, Sub0);
SDNode *Hi0 = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG,
DL, MVT::i32, LHS, Sub1);
SDNode *Lo1 = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG,
DL, MVT::i32, RHS, Sub0);
SDNode *Hi1 = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG,
DL, MVT::i32, RHS, Sub1);
SDVTList VTList = CurDAG->getVTList(MVT::i32, MVT::Glue);
SmallVector<SDValue, 8> AddLoArgs;
AddLoArgs.push_back(SDValue(Lo0, 0));
AddLoArgs.push_back(SDValue(Lo1, 0));
SDNode *AddLo = CurDAG->getMachineNode(
isCFDepth0() ? AMDGPU::S_ADD_I32 : AMDGPU::V_ADD_I32_e32,
DL, VTList, AddLoArgs);
SDValue Carry = SDValue(AddLo, 1);
SDNode *AddHi = CurDAG->getMachineNode(
isCFDepth0() ? AMDGPU::S_ADDC_U32 : AMDGPU::V_ADDC_U32_e32,
DL, MVT::i32, SDValue(Hi0, 0), SDValue(Hi1, 0), Carry);
SDValue Args[5] = {
CurDAG->getTargetConstant(AMDGPU::SReg_64RegClassID, MVT::i32),
SDValue(AddLo,0),
Sub0,
SDValue(AddHi,0),
Sub1,
};
return CurDAG->SelectNodeTo(N, AMDGPU::REG_SEQUENCE, MVT::i64, Args);
}
case ISD::SCALAR_TO_VECTOR:
case ISD::BUILD_VECTOR: {
unsigned RegClassID;
const AMDGPURegisterInfo *TRI =
static_cast<const AMDGPURegisterInfo*>(TM.getRegisterInfo());
const SIRegisterInfo *SIRI =
static_cast<const SIRegisterInfo*>(TM.getRegisterInfo());
EVT VT = N->getValueType(0);
unsigned NumVectorElts = VT.getVectorNumElements();
EVT EltVT = VT.getVectorElementType();
assert(EltVT.bitsEq(MVT::i32));
if (ST.getGeneration() >= AMDGPUSubtarget::SOUTHERN_ISLANDS) {
bool UseVReg = true;
for (SDNode::use_iterator U = N->use_begin(), E = SDNode::use_end();
U != E; ++U) {
if (!U->isMachineOpcode()) {
continue;
}
const TargetRegisterClass *RC = getOperandRegClass(*U, U.getOperandNo());
if (!RC) {
continue;
}
if (SIRI->isSGPRClass(RC)) {
UseVReg = false;
}
}
switch(NumVectorElts) {
case 1: RegClassID = UseVReg ? AMDGPU::VReg_32RegClassID :
AMDGPU::SReg_32RegClassID;
break;
case 2: RegClassID = UseVReg ? AMDGPU::VReg_64RegClassID :
AMDGPU::SReg_64RegClassID;
break;
case 4: RegClassID = UseVReg ? AMDGPU::VReg_128RegClassID :
AMDGPU::SReg_128RegClassID;
break;
case 8: RegClassID = UseVReg ? AMDGPU::VReg_256RegClassID :
AMDGPU::SReg_256RegClassID;
break;
case 16: RegClassID = UseVReg ? AMDGPU::VReg_512RegClassID :
AMDGPU::SReg_512RegClassID;
break;
default: llvm_unreachable("Do not know how to lower this BUILD_VECTOR");
}
} else {
// BUILD_VECTOR was lowered into an IMPLICIT_DEF + 4 INSERT_SUBREG
// that adds a 128 bits reg copy when going through TwoAddressInstructions
// pass. We want to avoid 128 bits copies as much as possible because they
// can't be bundled by our scheduler.
switch(NumVectorElts) {
case 2: RegClassID = AMDGPU::R600_Reg64RegClassID; break;
case 4: RegClassID = AMDGPU::R600_Reg128RegClassID; break;
default: llvm_unreachable("Do not know how to lower this BUILD_VECTOR");
}
}
SDValue RegClass = CurDAG->getTargetConstant(RegClassID, MVT::i32);
if (NumVectorElts == 1) {
return CurDAG->SelectNodeTo(N, AMDGPU::COPY_TO_REGCLASS, EltVT,
N->getOperand(0), RegClass);
}
assert(NumVectorElts <= 16 && "Vectors with more than 16 elements not "
"supported yet");
// 16 = Max Num Vector Elements
// 2 = 2 REG_SEQUENCE operands per element (value, subreg index)
// 1 = Vector Register Class
SmallVector<SDValue, 16 * 2 + 1> RegSeqArgs(NumVectorElts * 2 + 1);
RegSeqArgs[0] = CurDAG->getTargetConstant(RegClassID, MVT::i32);
bool IsRegSeq = true;
unsigned NOps = N->getNumOperands();
for (unsigned i = 0; i < NOps; i++) {
// XXX: Why is this here?
if (dyn_cast<RegisterSDNode>(N->getOperand(i))) {
IsRegSeq = false;
break;
}
RegSeqArgs[1 + (2 * i)] = N->getOperand(i);
RegSeqArgs[1 + (2 * i) + 1] =
CurDAG->getTargetConstant(TRI->getSubRegFromChannel(i), MVT::i32);
}
if (NOps != NumVectorElts) {
// Fill in the missing undef elements if this was a scalar_to_vector.
assert(Opc == ISD::SCALAR_TO_VECTOR && NOps < NumVectorElts);
MachineSDNode *ImpDef = CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF,
SDLoc(N), EltVT);
for (unsigned i = NOps; i < NumVectorElts; ++i) {
RegSeqArgs[1 + (2 * i)] = SDValue(ImpDef, 0);
RegSeqArgs[1 + (2 * i) + 1] =
CurDAG->getTargetConstant(TRI->getSubRegFromChannel(i), MVT::i32);
}
}
if (!IsRegSeq)
break;
return CurDAG->SelectNodeTo(N, AMDGPU::REG_SEQUENCE, N->getVTList(),
RegSeqArgs);
}
case ISD::BUILD_PAIR: {
SDValue RC, SubReg0, SubReg1;
if (ST.getGeneration() <= AMDGPUSubtarget::NORTHERN_ISLANDS) {
break;
}
if (N->getValueType(0) == MVT::i128) {
RC = CurDAG->getTargetConstant(AMDGPU::SReg_128RegClassID, MVT::i32);
SubReg0 = CurDAG->getTargetConstant(AMDGPU::sub0_sub1, MVT::i32);
SubReg1 = CurDAG->getTargetConstant(AMDGPU::sub2_sub3, MVT::i32);
} else if (N->getValueType(0) == MVT::i64) {
RC = CurDAG->getTargetConstant(AMDGPU::SReg_64RegClassID, MVT::i32);
SubReg0 = CurDAG->getTargetConstant(AMDGPU::sub0, MVT::i32);
SubReg1 = CurDAG->getTargetConstant(AMDGPU::sub1, MVT::i32);
} else {
llvm_unreachable("Unhandled value type for BUILD_PAIR");
}
const SDValue Ops[] = { RC, N->getOperand(0), SubReg0,
N->getOperand(1), SubReg1 };
return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE,
SDLoc(N), N->getValueType(0), Ops);
}
case ISD::Constant:
case ISD::ConstantFP: {
const AMDGPUSubtarget &ST = TM.getSubtarget<AMDGPUSubtarget>();
if (ST.getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS ||
N->getValueType(0).getSizeInBits() != 64 || isInlineImmediate(N))
break;
uint64_t Imm;
if (ConstantFPSDNode *FP = dyn_cast<ConstantFPSDNode>(N))
Imm = FP->getValueAPF().bitcastToAPInt().getZExtValue();
else {
ConstantSDNode *C = cast<ConstantSDNode>(N);
Imm = C->getZExtValue();
}
SDNode *Lo = CurDAG->getMachineNode(AMDGPU::S_MOV_B32, SDLoc(N), MVT::i32,
CurDAG->getConstant(Imm & 0xFFFFFFFF, MVT::i32));
SDNode *Hi = CurDAG->getMachineNode(AMDGPU::S_MOV_B32, SDLoc(N), MVT::i32,
CurDAG->getConstant(Imm >> 32, MVT::i32));
const SDValue Ops[] = {
CurDAG->getTargetConstant(AMDGPU::SReg_64RegClassID, MVT::i32),
SDValue(Lo, 0), CurDAG->getTargetConstant(AMDGPU::sub0, MVT::i32),
SDValue(Hi, 0), CurDAG->getTargetConstant(AMDGPU::sub1, MVT::i32)
};
return CurDAG->getMachineNode(TargetOpcode::REG_SEQUENCE, SDLoc(N),
N->getValueType(0), Ops);
}
case AMDGPUISD::REGISTER_LOAD: {
if (ST.getGeneration() <= AMDGPUSubtarget::NORTHERN_ISLANDS)
break;
SDValue Addr, Offset;
SelectADDRIndirect(N->getOperand(1), Addr, Offset);
const SDValue Ops[] = {
Addr,
Offset,
CurDAG->getTargetConstant(0, MVT::i32),
N->getOperand(0),
};
return CurDAG->getMachineNode(AMDGPU::SI_RegisterLoad, SDLoc(N),
CurDAG->getVTList(MVT::i32, MVT::i64, MVT::Other),
Ops);
}
case AMDGPUISD::REGISTER_STORE: {
if (ST.getGeneration() <= AMDGPUSubtarget::NORTHERN_ISLANDS)
break;
SDValue Addr, Offset;
SelectADDRIndirect(N->getOperand(2), Addr, Offset);
const SDValue Ops[] = {
N->getOperand(1),
Addr,
Offset,
CurDAG->getTargetConstant(0, MVT::i32),
N->getOperand(0),
};
return CurDAG->getMachineNode(AMDGPU::SI_RegisterStorePseudo, SDLoc(N),
CurDAG->getVTList(MVT::Other),
Ops);
}
case AMDGPUISD::BFE_I32:
case AMDGPUISD::BFE_U32: {
if (ST.getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS)
break;
// There is a scalar version available, but unlike the vector version which
// has a separate operand for the offset and width, the scalar version packs
// the width and offset into a single operand. Try to move to the scalar
// version if the offsets are constant, so that we can try to keep extended
// loads of kernel arguments in SGPRs.
// TODO: Technically we could try to pattern match scalar bitshifts of
// dynamic values, but it's probably not useful.
ConstantSDNode *Offset = dyn_cast<ConstantSDNode>(N->getOperand(1));
if (!Offset)
break;
ConstantSDNode *Width = dyn_cast<ConstantSDNode>(N->getOperand(2));
if (!Width)
break;
bool Signed = Opc == AMDGPUISD::BFE_I32;
// Transformation function, pack the offset and width of a BFE into
// the format expected by the S_BFE_I32 / S_BFE_U32. In the second
// source, bits [5:0] contain the offset and bits [22:16] the width.
uint32_t OffsetVal = Offset->getZExtValue();
uint32_t WidthVal = Width->getZExtValue();
uint32_t PackedVal = OffsetVal | WidthVal << 16;
SDValue PackedOffsetWidth = CurDAG->getTargetConstant(PackedVal, MVT::i32);
return CurDAG->getMachineNode(Signed ? AMDGPU::S_BFE_I32 : AMDGPU::S_BFE_U32,
SDLoc(N),
MVT::i32,
N->getOperand(0),
PackedOffsetWidth);
}
}
return SelectCode(N);
}
bool AMDGPUDAGToDAGISel::checkType(const Value *Ptr, unsigned AS) {
assert(AS != 0 && "Use checkPrivateAddress instead.");
if (!Ptr)
return false;
return Ptr->getType()->getPointerAddressSpace() == AS;
}
bool AMDGPUDAGToDAGISel::checkPrivateAddress(const MachineMemOperand *Op) {
if (Op->getPseudoValue())
return true;
if (PointerType *PT = dyn_cast<PointerType>(Op->getValue()->getType()))
return PT->getAddressSpace() == AMDGPUAS::PRIVATE_ADDRESS;
return false;
}
bool AMDGPUDAGToDAGISel::isGlobalStore(const StoreSDNode *N) {
return checkType(N->getMemOperand()->getValue(), AMDGPUAS::GLOBAL_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isPrivateStore(const StoreSDNode *N) {
const Value *MemVal = N->getMemOperand()->getValue();
return (!checkType(MemVal, AMDGPUAS::LOCAL_ADDRESS) &&
!checkType(MemVal, AMDGPUAS::GLOBAL_ADDRESS) &&
!checkType(MemVal, AMDGPUAS::REGION_ADDRESS));
}
bool AMDGPUDAGToDAGISel::isLocalStore(const StoreSDNode *N) {
return checkType(N->getMemOperand()->getValue(), AMDGPUAS::LOCAL_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isRegionStore(const StoreSDNode *N) {
return checkType(N->getMemOperand()->getValue(), AMDGPUAS::REGION_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isConstantLoad(const LoadSDNode *N, int CbId) const {
const Value *MemVal = N->getMemOperand()->getValue();
if (CbId == -1)
return checkType(MemVal, AMDGPUAS::CONSTANT_ADDRESS);
return checkType(MemVal, AMDGPUAS::CONSTANT_BUFFER_0 + CbId);
}
bool AMDGPUDAGToDAGISel::isGlobalLoad(const LoadSDNode *N) const {
if (N->getAddressSpace() == AMDGPUAS::CONSTANT_ADDRESS) {
const AMDGPUSubtarget &ST = TM.getSubtarget<AMDGPUSubtarget>();
if (ST.getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS ||
N->getMemoryVT().bitsLT(MVT::i32)) {
return true;
}
}
return checkType(N->getMemOperand()->getValue(), AMDGPUAS::GLOBAL_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isParamLoad(const LoadSDNode *N) const {
return checkType(N->getMemOperand()->getValue(), AMDGPUAS::PARAM_I_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isLocalLoad(const LoadSDNode *N) const {
return checkType(N->getMemOperand()->getValue(), AMDGPUAS::LOCAL_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isRegionLoad(const LoadSDNode *N) const {
return checkType(N->getMemOperand()->getValue(), AMDGPUAS::REGION_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isCPLoad(const LoadSDNode *N) const {
MachineMemOperand *MMO = N->getMemOperand();
if (checkPrivateAddress(N->getMemOperand())) {
if (MMO) {
const PseudoSourceValue *PSV = MMO->getPseudoValue();
if (PSV && PSV == PseudoSourceValue::getConstantPool()) {
return true;
}
}
}
return false;
}
bool AMDGPUDAGToDAGISel::isPrivateLoad(const LoadSDNode *N) const {
if (checkPrivateAddress(N->getMemOperand())) {
// Check to make sure we are not a constant pool load or a constant load
// that is marked as a private load
if (isCPLoad(N) || isConstantLoad(N, -1)) {
return false;
}
}
const Value *MemVal = N->getMemOperand()->getValue();
if (!checkType(MemVal, AMDGPUAS::LOCAL_ADDRESS) &&
!checkType(MemVal, AMDGPUAS::GLOBAL_ADDRESS) &&
!checkType(MemVal, AMDGPUAS::REGION_ADDRESS) &&
!checkType(MemVal, AMDGPUAS::CONSTANT_ADDRESS) &&
!checkType(MemVal, AMDGPUAS::PARAM_D_ADDRESS) &&
!checkType(MemVal, AMDGPUAS::PARAM_I_ADDRESS)){
return true;
}
return false;
}
bool AMDGPUDAGToDAGISel::isCFDepth0() const {
// FIXME: Figure out a way to use DominatorTree analysis here.
const BasicBlock *CurBlock = FuncInfo->MBB->getBasicBlock();
const Function *Fn = FuncInfo->Fn;
return &Fn->front() == CurBlock || &Fn->back() == CurBlock;
}
const char *AMDGPUDAGToDAGISel::getPassName() const {
return "AMDGPU DAG->DAG Pattern Instruction Selection";
}
#ifdef DEBUGTMP
#undef INT64_C
#endif
#undef DEBUGTMP
//===----------------------------------------------------------------------===//
// Complex Patterns
//===----------------------------------------------------------------------===//
bool AMDGPUDAGToDAGISel::SelectGlobalValueConstantOffset(SDValue Addr,
SDValue& IntPtr) {
if (ConstantSDNode *Cst = dyn_cast<ConstantSDNode>(Addr)) {
IntPtr = CurDAG->getIntPtrConstant(Cst->getZExtValue() / 4, true);
return true;
}
return false;
}
bool AMDGPUDAGToDAGISel::SelectGlobalValueVariableOffset(SDValue Addr,
SDValue& BaseReg, SDValue &Offset) {
if (!isa<ConstantSDNode>(Addr)) {
BaseReg = Addr;
Offset = CurDAG->getIntPtrConstant(0, true);
return true;
}
return false;
}
bool AMDGPUDAGToDAGISel::SelectADDRVTX_READ(SDValue Addr, SDValue &Base,
SDValue &Offset) {
ConstantSDNode *IMMOffset;
if (Addr.getOpcode() == ISD::ADD
&& (IMMOffset = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
&& isInt<16>(IMMOffset->getZExtValue())) {
Base = Addr.getOperand(0);
Offset = CurDAG->getTargetConstant(IMMOffset->getZExtValue(), MVT::i32);
return true;
// If the pointer address is constant, we can move it to the offset field.
} else if ((IMMOffset = dyn_cast<ConstantSDNode>(Addr))
&& isInt<16>(IMMOffset->getZExtValue())) {
Base = CurDAG->getCopyFromReg(CurDAG->getEntryNode(),
SDLoc(CurDAG->getEntryNode()),
AMDGPU::ZERO, MVT::i32);
Offset = CurDAG->getTargetConstant(IMMOffset->getZExtValue(), MVT::i32);
return true;
}
// Default case, no offset
Base = Addr;
Offset = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
bool AMDGPUDAGToDAGISel::SelectADDRIndirect(SDValue Addr, SDValue &Base,
SDValue &Offset) {
ConstantSDNode *C;
if ((C = dyn_cast<ConstantSDNode>(Addr))) {
Base = CurDAG->getRegister(AMDGPU::INDIRECT_BASE_ADDR, MVT::i32);
Offset = CurDAG->getTargetConstant(C->getZExtValue(), MVT::i32);
} else if ((Addr.getOpcode() == ISD::ADD || Addr.getOpcode() == ISD::OR) &&
(C = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))) {
Base = Addr.getOperand(0);
Offset = CurDAG->getTargetConstant(C->getZExtValue(), MVT::i32);
} else {
Base = Addr;
Offset = CurDAG->getTargetConstant(0, MVT::i32);
}
return true;
}
void AMDGPUDAGToDAGISel::PostprocessISelDAG() {
const AMDGPUTargetLowering& Lowering =
*static_cast<const AMDGPUTargetLowering*>(getTargetLowering());
bool IsModified = false;
do {
IsModified = false;
// Go over all selected nodes and try to fold them a bit more
for (SelectionDAG::allnodes_iterator I = CurDAG->allnodes_begin(),
E = CurDAG->allnodes_end(); I != E; ++I) {
SDNode *Node = I;
MachineSDNode *MachineNode = dyn_cast<MachineSDNode>(I);
if (!MachineNode)
continue;
SDNode *ResNode = Lowering.PostISelFolding(MachineNode, *CurDAG);
if (ResNode != Node) {
ReplaceUses(Node, ResNode);
IsModified = true;
}
}
CurDAG->RemoveDeadNodes();
} while (IsModified);
}
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