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llvm-6502/lib/Target/R600/AMDILISelDAGToDAG.cpp

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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/ADT/ValueMap.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/Support/Compiler.h"
#include <list>
#include <queue>
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);
virtual const char *getPassName() const;
virtual void PostprocessISelDAG();
private:
inline SDValue getSmallIPtrImm(unsigned Imm);
bool FoldOperand(SDValue &Src, SDValue &Sel, SDValue &Neg, SDValue &Abs,
const R600InstrInfo *TII, std::vector<unsigned> Cst);
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 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;
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() {
}
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()) {
return NULL; // Already selected.
}
switch (Opc) {
default: break;
case ISD::BUILD_VECTOR: {
const AMDGPUSubtarget &ST = TM.getSubtarget<AMDGPUSubtarget>();
if (ST.getGeneration() > AMDGPUSubtarget::NORTHERN_ISLANDS) {
break;
}
// BUILD_VECTOR is usually 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.
SDValue RegSeqArgs[9] = {
CurDAG->getTargetConstant(AMDGPU::R600_Reg128RegClassID, MVT::i32),
SDValue(), CurDAG->getTargetConstant(AMDGPU::sub0, MVT::i32),
SDValue(), CurDAG->getTargetConstant(AMDGPU::sub1, MVT::i32),
SDValue(), CurDAG->getTargetConstant(AMDGPU::sub2, MVT::i32),
SDValue(), CurDAG->getTargetConstant(AMDGPU::sub3, MVT::i32)
};
bool IsRegSeq = true;
for (unsigned i = 0; i < N->getNumOperands(); i++) {
if (dyn_cast<RegisterSDNode>(N->getOperand(i))) {
IsRegSeq = false;
break;
}
RegSeqArgs[2 * i + 1] = N->getOperand(i);
}
if (!IsRegSeq)
break;
return CurDAG->SelectNodeTo(N, AMDGPU::REG_SEQUENCE, N->getVTList(),
RegSeqArgs, 2 * N->getNumOperands() + 1);
}
case ISD::BUILD_PAIR: {
SDValue RC, SubReg0, SubReg1;
const AMDGPUSubtarget &ST = TM.getSubtarget<AMDGPUSubtarget>();
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::ConstantFP:
case ISD::Constant: {
const AMDGPUSubtarget &ST = TM.getSubtarget<AMDGPUSubtarget>();
// XXX: Custom immediate lowering not implemented yet. Instead we use
// pseudo instructions defined in SIInstructions.td
if (ST.getGeneration() > AMDGPUSubtarget::NORTHERN_ISLANDS) {
break;
}
const R600InstrInfo *TII = static_cast<const R600InstrInfo*>(TM.getInstrInfo());
uint64_t ImmValue = 0;
unsigned ImmReg = AMDGPU::ALU_LITERAL_X;
if (N->getOpcode() == ISD::ConstantFP) {
// XXX: 64-bit Immediates not supported yet
assert(N->getValueType(0) != MVT::f64);
ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N);
APFloat Value = C->getValueAPF();
float FloatValue = Value.convertToFloat();
if (FloatValue == 0.0) {
ImmReg = AMDGPU::ZERO;
} else if (FloatValue == 0.5) {
ImmReg = AMDGPU::HALF;
} else if (FloatValue == 1.0) {
ImmReg = AMDGPU::ONE;
} else {
ImmValue = Value.bitcastToAPInt().getZExtValue();
}
} else {
// XXX: 64-bit Immediates not supported yet
assert(N->getValueType(0) != MVT::i64);
ConstantSDNode *C = dyn_cast<ConstantSDNode>(N);
if (C->getZExtValue() == 0) {
ImmReg = AMDGPU::ZERO;
} else if (C->getZExtValue() == 1) {
ImmReg = AMDGPU::ONE_INT;
} else {
ImmValue = C->getZExtValue();
}
}
for (SDNode::use_iterator Use = N->use_begin(), Next = llvm::next(Use);
Use != SDNode::use_end(); Use = Next) {
Next = llvm::next(Use);
std::vector<SDValue> Ops;
for (unsigned i = 0; i < Use->getNumOperands(); ++i) {
Ops.push_back(Use->getOperand(i));
}
if (!Use->isMachineOpcode()) {
if (ImmReg == AMDGPU::ALU_LITERAL_X) {
// We can only use literal constants (e.g. AMDGPU::ZERO,
// AMDGPU::ONE, etc) in machine opcodes.
continue;
}
} else {
if (!TII->isALUInstr(Use->getMachineOpcode()) ||
(TII->get(Use->getMachineOpcode()).TSFlags &
R600_InstFlag::VECTOR)) {
continue;
}
int ImmIdx = TII->getOperandIdx(Use->getMachineOpcode(), R600Operands::IMM);
assert(ImmIdx != -1);
// subtract one from ImmIdx, because the DST operand is usually index
// 0 for MachineInstrs, but we have no DST in the Ops vector.
ImmIdx--;
// 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 == AMDGPU::ALU_LITERAL_X) {
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Use->getOperand(ImmIdx));
assert(C);
if (C->getZExtValue() != 0) {
// This instruction is already using an immediate.
continue;
}
// Set the immediate value
Ops[ImmIdx] = CurDAG->getTargetConstant(ImmValue, MVT::i32);
}
}
// Set the immediate register
Ops[Use.getOperandNo()] = CurDAG->getRegister(ImmReg, MVT::i32);
CurDAG->UpdateNodeOperands(*Use, Ops.data(), Use->getNumOperands());
}
break;
}
}
SDNode *Result = SelectCode(N);
// Fold operands of selected node
const AMDGPUSubtarget &ST = TM.getSubtarget<AMDGPUSubtarget>();
if (ST.getGeneration() <= AMDGPUSubtarget::NORTHERN_ISLANDS) {
const R600InstrInfo *TII =
static_cast<const R600InstrInfo*>(TM.getInstrInfo());
if (Result && Result->isMachineOpcode() && Result->getMachineOpcode() == AMDGPU::DOT_4) {
bool IsModified = false;
do {
std::vector<SDValue> Ops;
for(SDNode::op_iterator I = Result->op_begin(), E = Result->op_end();
I != E; ++I)
Ops.push_back(*I);
IsModified = FoldDotOperands(Result->getMachineOpcode(), TII, Ops);
if (IsModified) {
Result = CurDAG->UpdateNodeOperands(Result, Ops.data(), Ops.size());
}
} while (IsModified);
}
if (Result && Result->isMachineOpcode() &&
!(TII->get(Result->getMachineOpcode()).TSFlags & R600_InstFlag::VECTOR)
&& TII->isALUInstr(Result->getMachineOpcode())) {
// Fold FNEG/FABS/CONST_ADDRESS
// TODO: Isel can generate multiple MachineInst, we need to recursively
// parse Result
bool IsModified = false;
do {
std::vector<SDValue> Ops;
for(SDNode::op_iterator I = Result->op_begin(), E = Result->op_end();
I != E; ++I)
Ops.push_back(*I);
IsModified = FoldOperands(Result->getMachineOpcode(), TII, Ops);
if (IsModified) {
Result = CurDAG->UpdateNodeOperands(Result, Ops.data(), Ops.size());
}
} while (IsModified);
// If node has a single use which is CLAMP_R600, folds it
if (Result->hasOneUse() && Result->isMachineOpcode()) {
SDNode *PotentialClamp = *Result->use_begin();
if (PotentialClamp->isMachineOpcode() &&
PotentialClamp->getMachineOpcode() == AMDGPU::CLAMP_R600) {
unsigned ClampIdx =
TII->getOperandIdx(Result->getMachineOpcode(), R600Operands::CLAMP);
std::vector<SDValue> Ops;
unsigned NumOp = Result->getNumOperands();
for (unsigned i = 0; i < NumOp; ++i) {
Ops.push_back(Result->getOperand(i));
}
Ops[ClampIdx - 1] = CurDAG->getTargetConstant(1, MVT::i32);
Result = CurDAG->SelectNodeTo(PotentialClamp,
Result->getMachineOpcode(), PotentialClamp->getVTList(),
Ops.data(), NumOp);
}
}
}
}
return Result;
}
bool AMDGPUDAGToDAGISel::FoldOperand(SDValue &Src, SDValue &Sel, SDValue &Neg,
SDValue &Abs, const R600InstrInfo *TII,
std::vector<unsigned> Consts) {
switch (Src.getOpcode()) {
case AMDGPUISD::CONST_ADDRESS: {
SDValue CstOffset;
if (Src.getValueType().isVector() ||
!SelectGlobalValueConstantOffset(Src.getOperand(0), CstOffset))
return false;
ConstantSDNode *Cst = dyn_cast<ConstantSDNode>(CstOffset);
Consts.push_back(Cst->getZExtValue());
if (!TII->fitsConstReadLimitations(Consts))
return false;
Src = CurDAG->getRegister(AMDGPU::ALU_CONST, MVT::f32);
Sel = CstOffset;
return true;
}
case ISD::FNEG:
Src = Src.getOperand(0);
Neg = CurDAG->getTargetConstant(1, MVT::i32);
return true;
case ISD::FABS:
if (!Abs.getNode())
return false;
Src = Src.getOperand(0);
Abs = CurDAG->getTargetConstant(1, MVT::i32);
return true;
case ISD::BITCAST:
Src = Src.getOperand(0);
return true;
default:
return false;
}
}
bool AMDGPUDAGToDAGISel::FoldOperands(unsigned Opcode,
const R600InstrInfo *TII, std::vector<SDValue> &Ops) {
int OperandIdx[] = {
TII->getOperandIdx(Opcode, R600Operands::SRC0),
TII->getOperandIdx(Opcode, R600Operands::SRC1),
TII->getOperandIdx(Opcode, R600Operands::SRC2)
};
int SelIdx[] = {
TII->getOperandIdx(Opcode, R600Operands::SRC0_SEL),
TII->getOperandIdx(Opcode, R600Operands::SRC1_SEL),
TII->getOperandIdx(Opcode, R600Operands::SRC2_SEL)
};
int NegIdx[] = {
TII->getOperandIdx(Opcode, R600Operands::SRC0_NEG),
TII->getOperandIdx(Opcode, R600Operands::SRC1_NEG),
TII->getOperandIdx(Opcode, R600Operands::SRC2_NEG)
};
int AbsIdx[] = {
TII->getOperandIdx(Opcode, R600Operands::SRC0_ABS),
TII->getOperandIdx(Opcode, R600Operands::SRC1_ABS),
-1
};
// Gather constants values
std::vector<unsigned> Consts;
for (unsigned j = 0; j < 3; j++) {
int SrcIdx = OperandIdx[j];
if (SrcIdx < 0)
break;
if (RegisterSDNode *Reg = dyn_cast<RegisterSDNode>(Ops[SrcIdx - 1])) {
if (Reg->getReg() == AMDGPU::ALU_CONST) {
ConstantSDNode *Cst = dyn_cast<ConstantSDNode>(Ops[SelIdx[j] - 1]);
Consts.push_back(Cst->getZExtValue());
}
}
}
for (unsigned i = 0; i < 3; i++) {
if (OperandIdx[i] < 0)
return false;
SDValue &Src = Ops[OperandIdx[i] - 1];
SDValue &Sel = Ops[SelIdx[i] - 1];
SDValue &Neg = Ops[NegIdx[i] - 1];
SDValue FakeAbs;
SDValue &Abs = (AbsIdx[i] > -1) ? Ops[AbsIdx[i] - 1] : FakeAbs;
if (FoldOperand(Src, Sel, Neg, Abs, TII, Consts))
return true;
}
return false;
}
bool AMDGPUDAGToDAGISel::FoldDotOperands(unsigned Opcode,
const R600InstrInfo *TII, std::vector<SDValue> &Ops) {
int OperandIdx[] = {
TII->getOperandIdx(Opcode, R600Operands::SRC0_X),
TII->getOperandIdx(Opcode, R600Operands::SRC0_Y),
TII->getOperandIdx(Opcode, R600Operands::SRC0_Z),
TII->getOperandIdx(Opcode, R600Operands::SRC0_W),
TII->getOperandIdx(Opcode, R600Operands::SRC1_X),
TII->getOperandIdx(Opcode, R600Operands::SRC1_Y),
TII->getOperandIdx(Opcode, R600Operands::SRC1_Z),
TII->getOperandIdx(Opcode, R600Operands::SRC1_W)
};
int SelIdx[] = {
TII->getOperandIdx(Opcode, R600Operands::SRC0_SEL_X),
TII->getOperandIdx(Opcode, R600Operands::SRC0_SEL_Y),
TII->getOperandIdx(Opcode, R600Operands::SRC0_SEL_Z),
TII->getOperandIdx(Opcode, R600Operands::SRC0_SEL_W),
TII->getOperandIdx(Opcode, R600Operands::SRC1_SEL_X),
TII->getOperandIdx(Opcode, R600Operands::SRC1_SEL_Y),
TII->getOperandIdx(Opcode, R600Operands::SRC1_SEL_Z),
TII->getOperandIdx(Opcode, R600Operands::SRC1_SEL_W)
};
int NegIdx[] = {
TII->getOperandIdx(Opcode, R600Operands::SRC0_NEG_X),
TII->getOperandIdx(Opcode, R600Operands::SRC0_NEG_Y),
TII->getOperandIdx(Opcode, R600Operands::SRC0_NEG_Z),
TII->getOperandIdx(Opcode, R600Operands::SRC0_NEG_W),
TII->getOperandIdx(Opcode, R600Operands::SRC1_NEG_X),
TII->getOperandIdx(Opcode, R600Operands::SRC1_NEG_Y),
TII->getOperandIdx(Opcode, R600Operands::SRC1_NEG_Z),
TII->getOperandIdx(Opcode, R600Operands::SRC1_NEG_W)
};
int AbsIdx[] = {
TII->getOperandIdx(Opcode, R600Operands::SRC0_ABS_X),
TII->getOperandIdx(Opcode, R600Operands::SRC0_ABS_Y),
TII->getOperandIdx(Opcode, R600Operands::SRC0_ABS_Z),
TII->getOperandIdx(Opcode, R600Operands::SRC0_ABS_W),
TII->getOperandIdx(Opcode, R600Operands::SRC1_ABS_X),
TII->getOperandIdx(Opcode, R600Operands::SRC1_ABS_Y),
TII->getOperandIdx(Opcode, R600Operands::SRC1_ABS_Z),
TII->getOperandIdx(Opcode, R600Operands::SRC1_ABS_W)
};
// Gather constants values
std::vector<unsigned> Consts;
for (unsigned j = 0; j < 8; j++) {
int SrcIdx = OperandIdx[j];
if (SrcIdx < 0)
break;
if (RegisterSDNode *Reg = dyn_cast<RegisterSDNode>(Ops[SrcIdx - 1])) {
if (Reg->getReg() == AMDGPU::ALU_CONST) {
ConstantSDNode *Cst = dyn_cast<ConstantSDNode>(Ops[SelIdx[j] - 1]);
Consts.push_back(Cst->getZExtValue());
}
}
}
for (unsigned i = 0; i < 8; i++) {
if (OperandIdx[i] < 0)
return false;
SDValue &Src = Ops[OperandIdx[i] - 1];
SDValue &Sel = Ops[SelIdx[i] - 1];
SDValue &Neg = Ops[NegIdx[i] - 1];
SDValue &Abs = Ops[AbsIdx[i] - 1];
if (FoldOperand(Src, Sel, Neg, Abs, TII, Consts))
return true;
}
return false;
}
bool AMDGPUDAGToDAGISel::checkType(const Value *ptr, unsigned int addrspace) {
if (!ptr) {
return false;
}
Type *ptrType = ptr->getType();
return dyn_cast<PointerType>(ptrType)->getAddressSpace() == addrspace;
}
bool AMDGPUDAGToDAGISel::isGlobalStore(const StoreSDNode *N) {
return checkType(N->getSrcValue(), AMDGPUAS::GLOBAL_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isPrivateStore(const StoreSDNode *N) {
return (!checkType(N->getSrcValue(), AMDGPUAS::LOCAL_ADDRESS)
&& !checkType(N->getSrcValue(), AMDGPUAS::GLOBAL_ADDRESS)
&& !checkType(N->getSrcValue(), AMDGPUAS::REGION_ADDRESS));
}
bool AMDGPUDAGToDAGISel::isLocalStore(const StoreSDNode *N) {
return checkType(N->getSrcValue(), AMDGPUAS::LOCAL_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isRegionStore(const StoreSDNode *N) {
return checkType(N->getSrcValue(), AMDGPUAS::REGION_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isConstantLoad(const LoadSDNode *N, int cbID) const {
if (checkType(N->getSrcValue(), AMDGPUAS::CONSTANT_ADDRESS)) {
return true;
}
const DataLayout *DL = TM.getDataLayout();
MachineMemOperand *MMO = N->getMemOperand();
const Value *V = MMO->getValue();
const Value *BV = GetUnderlyingObject(V, DL, 0);
if (MMO
&& MMO->getValue()
&& ((V && dyn_cast<GlobalValue>(V))
|| (BV && dyn_cast<GlobalValue>(
GetUnderlyingObject(MMO->getValue(), DL, 0))))) {
return checkType(N->getSrcValue(), AMDGPUAS::PRIVATE_ADDRESS);
} else {
return false;
}
}
bool AMDGPUDAGToDAGISel::isGlobalLoad(const LoadSDNode *N) const {
return checkType(N->getSrcValue(), AMDGPUAS::GLOBAL_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isParamLoad(const LoadSDNode *N) const {
return checkType(N->getSrcValue(), AMDGPUAS::PARAM_I_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isLocalLoad(const LoadSDNode *N) const {
return checkType(N->getSrcValue(), AMDGPUAS::LOCAL_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isRegionLoad(const LoadSDNode *N) const {
return checkType(N->getSrcValue(), AMDGPUAS::REGION_ADDRESS);
}
bool AMDGPUDAGToDAGISel::isCPLoad(const LoadSDNode *N) const {
MachineMemOperand *MMO = N->getMemOperand();
if (checkType(N->getSrcValue(), AMDGPUAS::PRIVATE_ADDRESS)) {
if (MMO) {
const Value *V = MMO->getValue();
const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V);
if (PSV && PSV == PseudoSourceValue::getConstantPool()) {
return true;
}
}
}
return false;
}
bool AMDGPUDAGToDAGISel::isPrivateLoad(const LoadSDNode *N) const {
if (checkType(N->getSrcValue(), AMDGPUAS::PRIVATE_ADDRESS)) {
// 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;
}
}
if (!checkType(N->getSrcValue(), AMDGPUAS::LOCAL_ADDRESS)
&& !checkType(N->getSrcValue(), AMDGPUAS::GLOBAL_ADDRESS)
&& !checkType(N->getSrcValue(), AMDGPUAS::REGION_ADDRESS)
&& !checkType(N->getSrcValue(), AMDGPUAS::CONSTANT_ADDRESS)
&& !checkType(N->getSrcValue(), AMDGPUAS::PARAM_D_ADDRESS)
&& !checkType(N->getSrcValue(), AMDGPUAS::PARAM_I_ADDRESS)) {
return true;
}
return false;
}
const char *AMDGPUDAGToDAGISel::getPassName() const {
return "AMDGPU DAG->DAG Pattern Instruction Selection";
}
#ifdef DEBUGTMP
#undef INT64_C
#endif
#undef DEBUGTMP
///==== AMDGPU Functions ====///
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 (!dyn_cast<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() {
if (Subtarget.getGeneration() < AMDGPUSubtarget::SOUTHERN_ISLANDS) {
return;
}
// Go over all selected nodes and try to fold them a bit more
const AMDGPUTargetLowering& Lowering =
(*(const AMDGPUTargetLowering*)getTargetLowering());
for (SelectionDAG::allnodes_iterator I = CurDAG->allnodes_begin(),
E = CurDAG->allnodes_end(); I != E; ++I) {
SDNode *Node = I;
switch (Node->getOpcode()) {
// Fix the register class in copy to CopyToReg nodes - ISel will always
// use SReg classes for 64-bit copies, but this is not always what we want.
case ISD::CopyToReg: {
unsigned Reg = cast<RegisterSDNode>(Node->getOperand(1))->getReg();
SDValue Val = Node->getOperand(2);
const TargetRegisterClass *RC = RegInfo->getRegClass(Reg);
if (RC != &AMDGPU::SReg_64RegClass) {
continue;
}
if (!Val.getNode()->isMachineOpcode() ||
Val.getNode()->getMachineOpcode() == AMDGPU::IMPLICIT_DEF) {
continue;
}
const MCInstrDesc Desc = TM.getInstrInfo()->get(Val.getNode()->getMachineOpcode());
const TargetRegisterInfo *TRI = TM.getRegisterInfo();
RegInfo->setRegClass(Reg, TRI->getRegClass(Desc.OpInfo[0].RegClass));
continue;
}
}
MachineSDNode *MachineNode = dyn_cast<MachineSDNode>(I);
if (!MachineNode)
continue;
SDNode *ResNode = Lowering.PostISelFolding(MachineNode, *CurDAG);
if (ResNode != Node) {
ReplaceUses(Node, ResNode);
}
}
}
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