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llvm/lib/Target/R600/R600InstrInfo.cpp
Tom Stellard 04c559569f R600: Simplify handling of private address space 
The AMDGPUIndirectAddressing pass was previously responsible for
lowering private loads and stores to indirect addressing instructions.
However, this pass was buggy and way too complicated.  The only
advantage it had over the new simplified code was that it saved one
instruction per direct write to private memory.  This optimization
likely has a minimal impact on performance, and we may be able
to duplicate it using some other transformation.

For the private address space, we now:
1. Lower private loads/store to Register(Load|Store) instructions
2. Reserve part of the register file as 'private memory'
3. After regalloc lower the Register(Load|Store) instructions to
   MOV instructions that use indirect addressing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193179 91177308-0d34-0410-b5e6-96231b3b80d8
2013-10-22 18:19:10 +00:00

1393 lines
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//===-- R600InstrInfo.cpp - R600 Instruction Information ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file
/// \brief R600 Implementation of TargetInstrInfo.
//
//===----------------------------------------------------------------------===//
#include "R600InstrInfo.h"
#include "AMDGPU.h"
#include "AMDGPUSubtarget.h"
#include "AMDGPUTargetMachine.h"
#include "R600Defines.h"
#include "R600MachineFunctionInfo.h"
#include "R600RegisterInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#define GET_INSTRINFO_CTOR
#include "AMDGPUGenDFAPacketizer.inc"
using namespace llvm;
R600InstrInfo::R600InstrInfo(AMDGPUTargetMachine &tm)
: AMDGPUInstrInfo(tm),
RI(tm),
ST(tm.getSubtarget<AMDGPUSubtarget>())
{ }
const R600RegisterInfo &R600InstrInfo::getRegisterInfo() const {
return RI;
}
bool R600InstrInfo::isTrig(const MachineInstr &MI) const {
return get(MI.getOpcode()).TSFlags & R600_InstFlag::TRIG;
}
bool R600InstrInfo::isVector(const MachineInstr &MI) const {
return get(MI.getOpcode()).TSFlags & R600_InstFlag::VECTOR;
}
void
R600InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI, DebugLoc DL,
unsigned DestReg, unsigned SrcReg,
bool KillSrc) const {
unsigned VectorComponents = 0;
if (AMDGPU::R600_Reg128RegClass.contains(DestReg) &&
AMDGPU::R600_Reg128RegClass.contains(SrcReg)) {
VectorComponents = 4;
} else if(AMDGPU::R600_Reg64RegClass.contains(DestReg) &&
AMDGPU::R600_Reg64RegClass.contains(SrcReg)) {
VectorComponents = 2;
}
if (VectorComponents > 0) {
for (unsigned I = 0; I < VectorComponents; I++) {
unsigned SubRegIndex = RI.getSubRegFromChannel(I);
buildDefaultInstruction(MBB, MI, AMDGPU::MOV,
RI.getSubReg(DestReg, SubRegIndex),
RI.getSubReg(SrcReg, SubRegIndex))
.addReg(DestReg,
RegState::Define | RegState::Implicit);
}
} else {
MachineInstr *NewMI = buildDefaultInstruction(MBB, MI, AMDGPU::MOV,
DestReg, SrcReg);
NewMI->getOperand(getOperandIdx(*NewMI, AMDGPU::OpName::src0))
.setIsKill(KillSrc);
}
}
unsigned R600InstrInfo::getIEQOpcode() const {
return AMDGPU::SETE_INT;
}
bool R600InstrInfo::isMov(unsigned Opcode) const {
switch(Opcode) {
default: return false;
case AMDGPU::MOV:
case AMDGPU::MOV_IMM_F32:
case AMDGPU::MOV_IMM_I32:
return true;
}
}
// Some instructions act as place holders to emulate operations that the GPU
// hardware does automatically. This function can be used to check if
// an opcode falls into this category.
bool R600InstrInfo::isPlaceHolderOpcode(unsigned Opcode) const {
switch (Opcode) {
default: return false;
case AMDGPU::RETURN:
return true;
}
}
bool R600InstrInfo::isReductionOp(unsigned Opcode) const {
return false;
}
bool R600InstrInfo::isCubeOp(unsigned Opcode) const {
switch(Opcode) {
default: return false;
case AMDGPU::CUBE_r600_pseudo:
case AMDGPU::CUBE_r600_real:
case AMDGPU::CUBE_eg_pseudo:
case AMDGPU::CUBE_eg_real:
return true;
}
}
bool R600InstrInfo::isALUInstr(unsigned Opcode) const {
unsigned TargetFlags = get(Opcode).TSFlags;
return (TargetFlags & R600_InstFlag::ALU_INST);
}
bool R600InstrInfo::hasInstrModifiers(unsigned Opcode) const {
unsigned TargetFlags = get(Opcode).TSFlags;
return ((TargetFlags & R600_InstFlag::OP1) |
(TargetFlags & R600_InstFlag::OP2) |
(TargetFlags & R600_InstFlag::OP3));
}
bool R600InstrInfo::isLDSInstr(unsigned Opcode) const {
unsigned TargetFlags = get(Opcode).TSFlags;
return ((TargetFlags & R600_InstFlag::LDS_1A) |
(TargetFlags & R600_InstFlag::LDS_1A1D) |
(TargetFlags & R600_InstFlag::LDS_1A2D));
}
bool R600InstrInfo::canBeConsideredALU(const MachineInstr *MI) const {
if (isALUInstr(MI->getOpcode()))
return true;
if (isVector(*MI) || isCubeOp(MI->getOpcode()))
return true;
switch (MI->getOpcode()) {
case AMDGPU::PRED_X:
case AMDGPU::INTERP_PAIR_XY:
case AMDGPU::INTERP_PAIR_ZW:
case AMDGPU::INTERP_VEC_LOAD:
case AMDGPU::COPY:
case AMDGPU::DOT_4:
return true;
default:
return false;
}
}
bool R600InstrInfo::isTransOnly(unsigned Opcode) const {
if (ST.hasCaymanISA())
return false;
return (get(Opcode).getSchedClass() == AMDGPU::Sched::TransALU);
}
bool R600InstrInfo::isTransOnly(const MachineInstr *MI) const {
return isTransOnly(MI->getOpcode());
}
bool R600InstrInfo::isVectorOnly(unsigned Opcode) const {
return (get(Opcode).getSchedClass() == AMDGPU::Sched::VecALU);
}
bool R600InstrInfo::isVectorOnly(const MachineInstr *MI) const {
return isVectorOnly(MI->getOpcode());
}
bool R600InstrInfo::isExport(unsigned Opcode) const {
return (get(Opcode).TSFlags & R600_InstFlag::IS_EXPORT);
}
bool R600InstrInfo::usesVertexCache(unsigned Opcode) const {
return ST.hasVertexCache() && IS_VTX(get(Opcode));
}
bool R600InstrInfo::usesVertexCache(const MachineInstr *MI) const {
const R600MachineFunctionInfo *MFI = MI->getParent()->getParent()->getInfo<R600MachineFunctionInfo>();
return MFI->ShaderType != ShaderType::COMPUTE && usesVertexCache(MI->getOpcode());
}
bool R600InstrInfo::usesTextureCache(unsigned Opcode) const {
return (!ST.hasVertexCache() && IS_VTX(get(Opcode))) || IS_TEX(get(Opcode));
}
bool R600InstrInfo::usesTextureCache(const MachineInstr *MI) const {
const R600MachineFunctionInfo *MFI = MI->getParent()->getParent()->getInfo<R600MachineFunctionInfo>();
return (MFI->ShaderType == ShaderType::COMPUTE && usesVertexCache(MI->getOpcode())) ||
usesTextureCache(MI->getOpcode());
}
bool R600InstrInfo::mustBeLastInClause(unsigned Opcode) const {
switch (Opcode) {
case AMDGPU::KILLGT:
case AMDGPU::GROUP_BARRIER:
return true;
default:
return false;
}
}
bool R600InstrInfo::usesAddressRegister(MachineInstr *MI) const {
return MI->findRegisterUseOperandIdx(AMDGPU::AR_X) != -1;
}
bool R600InstrInfo::definesAddressRegister(MachineInstr *MI) const {
return MI->findRegisterDefOperandIdx(AMDGPU::AR_X) != -1;
}
bool R600InstrInfo::readsLDSSrcReg(const MachineInstr *MI) const {
if (!isALUInstr(MI->getOpcode())) {
return false;
}
for (MachineInstr::const_mop_iterator I = MI->operands_begin(),
E = MI->operands_end(); I != E; ++I) {
if (!I->isReg() || !I->isUse() ||
TargetRegisterInfo::isVirtualRegister(I->getReg()))
continue;
if (AMDGPU::R600_LDS_SRC_REGRegClass.contains(I->getReg()))
return true;
}
return false;
}
int R600InstrInfo::getSrcIdx(unsigned Opcode, unsigned SrcNum) const {
static const unsigned OpTable[] = {
AMDGPU::OpName::src0,
AMDGPU::OpName::src1,
AMDGPU::OpName::src2
};
assert (SrcNum < 3);
return getOperandIdx(Opcode, OpTable[SrcNum]);
}
#define SRC_SEL_ROWS 11
int R600InstrInfo::getSelIdx(unsigned Opcode, unsigned SrcIdx) const {
static const unsigned SrcSelTable[SRC_SEL_ROWS][2] = {
{AMDGPU::OpName::src0, AMDGPU::OpName::src0_sel},
{AMDGPU::OpName::src1, AMDGPU::OpName::src1_sel},
{AMDGPU::OpName::src2, AMDGPU::OpName::src2_sel},
{AMDGPU::OpName::src0_X, AMDGPU::OpName::src0_sel_X},
{AMDGPU::OpName::src0_Y, AMDGPU::OpName::src0_sel_Y},
{AMDGPU::OpName::src0_Z, AMDGPU::OpName::src0_sel_Z},
{AMDGPU::OpName::src0_W, AMDGPU::OpName::src0_sel_W},
{AMDGPU::OpName::src1_X, AMDGPU::OpName::src1_sel_X},
{AMDGPU::OpName::src1_Y, AMDGPU::OpName::src1_sel_Y},
{AMDGPU::OpName::src1_Z, AMDGPU::OpName::src1_sel_Z},
{AMDGPU::OpName::src1_W, AMDGPU::OpName::src1_sel_W}
};
for (unsigned i = 0; i < SRC_SEL_ROWS; ++i) {
if (getOperandIdx(Opcode, SrcSelTable[i][0]) == (int)SrcIdx) {
return getOperandIdx(Opcode, SrcSelTable[i][1]);
}
}
return -1;
}
#undef SRC_SEL_ROWS
SmallVector<std::pair<MachineOperand *, int64_t>, 3>
R600InstrInfo::getSrcs(MachineInstr *MI) const {
SmallVector<std::pair<MachineOperand *, int64_t>, 3> Result;
if (MI->getOpcode() == AMDGPU::DOT_4) {
static const unsigned OpTable[8][2] = {
{AMDGPU::OpName::src0_X, AMDGPU::OpName::src0_sel_X},
{AMDGPU::OpName::src0_Y, AMDGPU::OpName::src0_sel_Y},
{AMDGPU::OpName::src0_Z, AMDGPU::OpName::src0_sel_Z},
{AMDGPU::OpName::src0_W, AMDGPU::OpName::src0_sel_W},
{AMDGPU::OpName::src1_X, AMDGPU::OpName::src1_sel_X},
{AMDGPU::OpName::src1_Y, AMDGPU::OpName::src1_sel_Y},
{AMDGPU::OpName::src1_Z, AMDGPU::OpName::src1_sel_Z},
{AMDGPU::OpName::src1_W, AMDGPU::OpName::src1_sel_W},
};
for (unsigned j = 0; j < 8; j++) {
MachineOperand &MO = MI->getOperand(getOperandIdx(MI->getOpcode(),
OpTable[j][0]));
unsigned Reg = MO.getReg();
if (Reg == AMDGPU::ALU_CONST) {
unsigned Sel = MI->getOperand(getOperandIdx(MI->getOpcode(),
OpTable[j][1])).getImm();
Result.push_back(std::pair<MachineOperand *, int64_t>(&MO, Sel));
continue;
}
}
return Result;
}
static const unsigned OpTable[3][2] = {
{AMDGPU::OpName::src0, AMDGPU::OpName::src0_sel},
{AMDGPU::OpName::src1, AMDGPU::OpName::src1_sel},
{AMDGPU::OpName::src2, AMDGPU::OpName::src2_sel},
};
for (unsigned j = 0; j < 3; j++) {
int SrcIdx = getOperandIdx(MI->getOpcode(), OpTable[j][0]);
if (SrcIdx < 0)
break;
MachineOperand &MO = MI->getOperand(SrcIdx);
unsigned Reg = MI->getOperand(SrcIdx).getReg();
if (Reg == AMDGPU::ALU_CONST) {
unsigned Sel = MI->getOperand(
getOperandIdx(MI->getOpcode(), OpTable[j][1])).getImm();
Result.push_back(std::pair<MachineOperand *, int64_t>(&MO, Sel));
continue;
}
if (Reg == AMDGPU::ALU_LITERAL_X) {
unsigned Imm = MI->getOperand(
getOperandIdx(MI->getOpcode(), AMDGPU::OpName::literal)).getImm();
Result.push_back(std::pair<MachineOperand *, int64_t>(&MO, Imm));
continue;
}
Result.push_back(std::pair<MachineOperand *, int64_t>(&MO, 0));
}
return Result;
}
std::vector<std::pair<int, unsigned> >
R600InstrInfo::ExtractSrcs(MachineInstr *MI,
const DenseMap<unsigned, unsigned> &PV,
unsigned &ConstCount) const {
ConstCount = 0;
const SmallVector<std::pair<MachineOperand *, int64_t>, 3> Srcs = getSrcs(MI);
const std::pair<int, unsigned> DummyPair(-1, 0);
std::vector<std::pair<int, unsigned> > Result;
unsigned i = 0;
for (unsigned n = Srcs.size(); i < n; ++i) {
unsigned Reg = Srcs[i].first->getReg();
unsigned Index = RI.getEncodingValue(Reg) & 0xff;
if (Reg == AMDGPU::OQAP) {
Result.push_back(std::pair<int, unsigned>(Index, 0));
}
if (PV.find(Reg) != PV.end()) {
// 255 is used to tells its a PS/PV reg
Result.push_back(std::pair<int, unsigned>(255, 0));
continue;
}
if (Index > 127) {
ConstCount++;
Result.push_back(DummyPair);
continue;
}
unsigned Chan = RI.getHWRegChan(Reg);
Result.push_back(std::pair<int, unsigned>(Index, Chan));
}
for (; i < 3; ++i)
Result.push_back(DummyPair);
return Result;
}
static std::vector<std::pair<int, unsigned> >
Swizzle(std::vector<std::pair<int, unsigned> > Src,
R600InstrInfo::BankSwizzle Swz) {
if (Src[0] == Src[1])
Src[1].first = -1;
switch (Swz) {
case R600InstrInfo::ALU_VEC_012_SCL_210:
break;
case R600InstrInfo::ALU_VEC_021_SCL_122:
std::swap(Src[1], Src[2]);
break;
case R600InstrInfo::ALU_VEC_102_SCL_221:
std::swap(Src[0], Src[1]);
break;
case R600InstrInfo::ALU_VEC_120_SCL_212:
std::swap(Src[0], Src[1]);
std::swap(Src[0], Src[2]);
break;
case R600InstrInfo::ALU_VEC_201:
std::swap(Src[0], Src[2]);
std::swap(Src[0], Src[1]);
break;
case R600InstrInfo::ALU_VEC_210:
std::swap(Src[0], Src[2]);
break;
}
return Src;
}
static unsigned
getTransSwizzle(R600InstrInfo::BankSwizzle Swz, unsigned Op) {
switch (Swz) {
case R600InstrInfo::ALU_VEC_012_SCL_210: {
unsigned Cycles[3] = { 2, 1, 0};
return Cycles[Op];
}
case R600InstrInfo::ALU_VEC_021_SCL_122: {
unsigned Cycles[3] = { 1, 2, 2};
return Cycles[Op];
}
case R600InstrInfo::ALU_VEC_120_SCL_212: {
unsigned Cycles[3] = { 2, 1, 2};
return Cycles[Op];
}
case R600InstrInfo::ALU_VEC_102_SCL_221: {
unsigned Cycles[3] = { 2, 2, 1};
return Cycles[Op];
}
default:
llvm_unreachable("Wrong Swizzle for Trans Slot");
return 0;
}
}
/// returns how many MIs (whose inputs are represented by IGSrcs) can be packed
/// in the same Instruction Group while meeting read port limitations given a
/// Swz swizzle sequence.
unsigned R600InstrInfo::isLegalUpTo(
const std::vector<std::vector<std::pair<int, unsigned> > > &IGSrcs,
const std::vector<R600InstrInfo::BankSwizzle> &Swz,
const std::vector<std::pair<int, unsigned> > &TransSrcs,
R600InstrInfo::BankSwizzle TransSwz) const {
int Vector[4][3];
memset(Vector, -1, sizeof(Vector));
for (unsigned i = 0, e = IGSrcs.size(); i < e; i++) {
const std::vector<std::pair<int, unsigned> > &Srcs =
Swizzle(IGSrcs[i], Swz[i]);
for (unsigned j = 0; j < 3; j++) {
const std::pair<int, unsigned> &Src = Srcs[j];
if (Src.first < 0 || Src.first == 255)
continue;
if (Src.first == GET_REG_INDEX(RI.getEncodingValue(AMDGPU::OQAP))) {
if (Swz[i] != R600InstrInfo::ALU_VEC_012_SCL_210 &&
Swz[i] != R600InstrInfo::ALU_VEC_021_SCL_122) {
// The value from output queue A (denoted by register OQAP) can
// only be fetched during the first cycle.
return false;
}
// OQAP does not count towards the normal read port restrictions
continue;
}
if (Vector[Src.second][j] < 0)
Vector[Src.second][j] = Src.first;
if (Vector[Src.second][j] != Src.first)
return i;
}
}
// Now check Trans Alu
for (unsigned i = 0, e = TransSrcs.size(); i < e; ++i) {
const std::pair<int, unsigned> &Src = TransSrcs[i];
unsigned Cycle = getTransSwizzle(TransSwz, i);
if (Src.first < 0)
continue;
if (Src.first == 255)
continue;
if (Vector[Src.second][Cycle] < 0)
Vector[Src.second][Cycle] = Src.first;
if (Vector[Src.second][Cycle] != Src.first)
return IGSrcs.size() - 1;
}
return IGSrcs.size();
}
/// Given a swizzle sequence SwzCandidate and an index Idx, returns the next
/// (in lexicographic term) swizzle sequence assuming that all swizzles after
/// Idx can be skipped
static bool
NextPossibleSolution(
std::vector<R600InstrInfo::BankSwizzle> &SwzCandidate,
unsigned Idx) {
assert(Idx < SwzCandidate.size());
int ResetIdx = Idx;
while (ResetIdx > -1 && SwzCandidate[ResetIdx] == R600InstrInfo::ALU_VEC_210)
ResetIdx --;
for (unsigned i = ResetIdx + 1, e = SwzCandidate.size(); i < e; i++) {
SwzCandidate[i] = R600InstrInfo::ALU_VEC_012_SCL_210;
}
if (ResetIdx == -1)
return false;
int NextSwizzle = SwzCandidate[ResetIdx] + 1;
SwzCandidate[ResetIdx] = (R600InstrInfo::BankSwizzle)NextSwizzle;
return true;
}
/// Enumerate all possible Swizzle sequence to find one that can meet all
/// read port requirements.
bool R600InstrInfo::FindSwizzleForVectorSlot(
const std::vector<std::vector<std::pair<int, unsigned> > > &IGSrcs,
std::vector<R600InstrInfo::BankSwizzle> &SwzCandidate,
const std::vector<std::pair<int, unsigned> > &TransSrcs,
R600InstrInfo::BankSwizzle TransSwz) const {
unsigned ValidUpTo = 0;
do {
ValidUpTo = isLegalUpTo(IGSrcs, SwzCandidate, TransSrcs, TransSwz);
if (ValidUpTo == IGSrcs.size())
return true;
} while (NextPossibleSolution(SwzCandidate, ValidUpTo));
return false;
}
/// Instructions in Trans slot can't read gpr at cycle 0 if they also read
/// a const, and can't read a gpr at cycle 1 if they read 2 const.
static bool
isConstCompatible(R600InstrInfo::BankSwizzle TransSwz,
const std::vector<std::pair<int, unsigned> > &TransOps,
unsigned ConstCount) {
// TransALU can't read 3 constants
if (ConstCount > 2)
return false;
for (unsigned i = 0, e = TransOps.size(); i < e; ++i) {
const std::pair<int, unsigned> &Src = TransOps[i];
unsigned Cycle = getTransSwizzle(TransSwz, i);
if (Src.first < 0)
continue;
if (ConstCount > 0 && Cycle == 0)
return false;
if (ConstCount > 1 && Cycle == 1)
return false;
}
return true;
}
bool
R600InstrInfo::fitsReadPortLimitations(const std::vector<MachineInstr *> &IG,
const DenseMap<unsigned, unsigned> &PV,
std::vector<BankSwizzle> &ValidSwizzle,
bool isLastAluTrans)
const {
//Todo : support shared src0 - src1 operand
std::vector<std::vector<std::pair<int, unsigned> > > IGSrcs;
ValidSwizzle.clear();
unsigned ConstCount;
BankSwizzle TransBS = ALU_VEC_012_SCL_210;
for (unsigned i = 0, e = IG.size(); i < e; ++i) {
IGSrcs.push_back(ExtractSrcs(IG[i], PV, ConstCount));
unsigned Op = getOperandIdx(IG[i]->getOpcode(),
AMDGPU::OpName::bank_swizzle);
ValidSwizzle.push_back( (R600InstrInfo::BankSwizzle)
IG[i]->getOperand(Op).getImm());
}
std::vector<std::pair<int, unsigned> > TransOps;
if (!isLastAluTrans)
return FindSwizzleForVectorSlot(IGSrcs, ValidSwizzle, TransOps, TransBS);
TransOps = IGSrcs.back();
IGSrcs.pop_back();
ValidSwizzle.pop_back();
static const R600InstrInfo::BankSwizzle TransSwz[] = {
ALU_VEC_012_SCL_210,
ALU_VEC_021_SCL_122,
ALU_VEC_120_SCL_212,
ALU_VEC_102_SCL_221
};
for (unsigned i = 0; i < 4; i++) {
TransBS = TransSwz[i];
if (!isConstCompatible(TransBS, TransOps, ConstCount))
continue;
bool Result = FindSwizzleForVectorSlot(IGSrcs, ValidSwizzle, TransOps,
TransBS);
if (Result) {
ValidSwizzle.push_back(TransBS);
return true;
}
}
return false;
}
bool
R600InstrInfo::fitsConstReadLimitations(const std::vector<unsigned> &Consts)
const {
assert (Consts.size() <= 12 && "Too many operands in instructions group");
unsigned Pair1 = 0, Pair2 = 0;
for (unsigned i = 0, n = Consts.size(); i < n; ++i) {
unsigned ReadConstHalf = Consts[i] & 2;
unsigned ReadConstIndex = Consts[i] & (~3);
unsigned ReadHalfConst = ReadConstIndex | ReadConstHalf;
if (!Pair1) {
Pair1 = ReadHalfConst;
continue;
}
if (Pair1 == ReadHalfConst)
continue;
if (!Pair2) {
Pair2 = ReadHalfConst;
continue;
}
if (Pair2 != ReadHalfConst)
return false;
}
return true;
}
bool
R600InstrInfo::fitsConstReadLimitations(const std::vector<MachineInstr *> &MIs)
const {
std::vector<unsigned> Consts;
SmallSet<int64_t, 4> Literals;
for (unsigned i = 0, n = MIs.size(); i < n; i++) {
MachineInstr *MI = MIs[i];
if (!isALUInstr(MI->getOpcode()))
continue;
const SmallVectorImpl<std::pair<MachineOperand *, int64_t> > &Srcs =
getSrcs(MI);
for (unsigned j = 0, e = Srcs.size(); j < e; j++) {
std::pair<MachineOperand *, unsigned> Src = Srcs[j];
if (Src.first->getReg() == AMDGPU::ALU_LITERAL_X)
Literals.insert(Src.second);
if (Literals.size() > 4)
return false;
if (Src.first->getReg() == AMDGPU::ALU_CONST)
Consts.push_back(Src.second);
if (AMDGPU::R600_KC0RegClass.contains(Src.first->getReg()) ||
AMDGPU::R600_KC1RegClass.contains(Src.first->getReg())) {
unsigned Index = RI.getEncodingValue(Src.first->getReg()) & 0xff;
unsigned Chan = RI.getHWRegChan(Src.first->getReg());
Consts.push_back((Index << 2) | Chan);
}
}
}
return fitsConstReadLimitations(Consts);
}
DFAPacketizer *R600InstrInfo::CreateTargetScheduleState(const TargetMachine *TM,
const ScheduleDAG *DAG) const {
const InstrItineraryData *II = TM->getInstrItineraryData();
return TM->getSubtarget<AMDGPUSubtarget>().createDFAPacketizer(II);
}
static bool
isPredicateSetter(unsigned Opcode) {
switch (Opcode) {
case AMDGPU::PRED_X:
return true;
default:
return false;
}
}
static MachineInstr *
findFirstPredicateSetterFrom(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) {
while (I != MBB.begin()) {
--I;
MachineInstr *MI = I;
if (isPredicateSetter(MI->getOpcode()))
return MI;
}
return NULL;
}
static
bool isJump(unsigned Opcode) {
return Opcode == AMDGPU::JUMP || Opcode == AMDGPU::JUMP_COND;
}
static bool isBranch(unsigned Opcode) {
return Opcode == AMDGPU::BRANCH || Opcode == AMDGPU::BRANCH_COND_i32 ||
Opcode == AMDGPU::BRANCH_COND_f32;
}
bool
R600InstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
SmallVectorImpl<MachineOperand> &Cond,
bool AllowModify) const {
// Most of the following comes from the ARM implementation of AnalyzeBranch
// If the block has no terminators, it just falls into the block after it.
MachineBasicBlock::iterator I = MBB.end();
if (I == MBB.begin())
return false;
--I;
while (I->isDebugValue()) {
if (I == MBB.begin())
return false;
--I;
}
// AMDGPU::BRANCH* instructions are only available after isel and are not
// handled
if (isBranch(I->getOpcode()))
return true;
if (!isJump(static_cast<MachineInstr *>(I)->getOpcode())) {
return false;
}
// Get the last instruction in the block.
MachineInstr *LastInst = I;
// If there is only one terminator instruction, process it.
unsigned LastOpc = LastInst->getOpcode();
if (I == MBB.begin() ||
!isJump(static_cast<MachineInstr *>(--I)->getOpcode())) {
if (LastOpc == AMDGPU::JUMP) {
TBB = LastInst->getOperand(0).getMBB();
return false;
} else if (LastOpc == AMDGPU::JUMP_COND) {
MachineInstr *predSet = I;
while (!isPredicateSetter(predSet->getOpcode())) {
predSet = --I;
}
TBB = LastInst->getOperand(0).getMBB();
Cond.push_back(predSet->getOperand(1));
Cond.push_back(predSet->getOperand(2));
Cond.push_back(MachineOperand::CreateReg(AMDGPU::PRED_SEL_ONE, false));
return false;
}
return true; // Can't handle indirect branch.
}
// Get the instruction before it if it is a terminator.
MachineInstr *SecondLastInst = I;
unsigned SecondLastOpc = SecondLastInst->getOpcode();
// If the block ends with a B and a Bcc, handle it.
if (SecondLastOpc == AMDGPU::JUMP_COND && LastOpc == AMDGPU::JUMP) {
MachineInstr *predSet = --I;
while (!isPredicateSetter(predSet->getOpcode())) {
predSet = --I;
}
TBB = SecondLastInst->getOperand(0).getMBB();
FBB = LastInst->getOperand(0).getMBB();
Cond.push_back(predSet->getOperand(1));
Cond.push_back(predSet->getOperand(2));
Cond.push_back(MachineOperand::CreateReg(AMDGPU::PRED_SEL_ONE, false));
return false;
}
// Otherwise, can't handle this.
return true;
}
int R600InstrInfo::getBranchInstr(const MachineOperand &op) const {
const MachineInstr *MI = op.getParent();
switch (MI->getDesc().OpInfo->RegClass) {
default: // FIXME: fallthrough??
case AMDGPU::GPRI32RegClassID: return AMDGPU::BRANCH_COND_i32;
case AMDGPU::GPRF32RegClassID: return AMDGPU::BRANCH_COND_f32;
};
}
static
MachineBasicBlock::iterator FindLastAluClause(MachineBasicBlock &MBB) {
for (MachineBasicBlock::reverse_iterator It = MBB.rbegin(), E = MBB.rend();
It != E; ++It) {
if (It->getOpcode() == AMDGPU::CF_ALU ||
It->getOpcode() == AMDGPU::CF_ALU_PUSH_BEFORE)
return llvm::prior(It.base());
}
return MBB.end();
}
unsigned
R600InstrInfo::InsertBranch(MachineBasicBlock &MBB,
MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
const SmallVectorImpl<MachineOperand> &Cond,
DebugLoc DL) const {
assert(TBB && "InsertBranch must not be told to insert a fallthrough");
if (FBB == 0) {
if (Cond.empty()) {
BuildMI(&MBB, DL, get(AMDGPU::JUMP)).addMBB(TBB);
return 1;
} else {
MachineInstr *PredSet = findFirstPredicateSetterFrom(MBB, MBB.end());
assert(PredSet && "No previous predicate !");
addFlag(PredSet, 0, MO_FLAG_PUSH);
PredSet->getOperand(2).setImm(Cond[1].getImm());
BuildMI(&MBB, DL, get(AMDGPU::JUMP_COND))
.addMBB(TBB)
.addReg(AMDGPU::PREDICATE_BIT, RegState::Kill);
MachineBasicBlock::iterator CfAlu = FindLastAluClause(MBB);
if (CfAlu == MBB.end())
return 1;
assert (CfAlu->getOpcode() == AMDGPU::CF_ALU);
CfAlu->setDesc(get(AMDGPU::CF_ALU_PUSH_BEFORE));
return 1;
}
} else {
MachineInstr *PredSet = findFirstPredicateSetterFrom(MBB, MBB.end());
assert(PredSet && "No previous predicate !");
addFlag(PredSet, 0, MO_FLAG_PUSH);
PredSet->getOperand(2).setImm(Cond[1].getImm());
BuildMI(&MBB, DL, get(AMDGPU::JUMP_COND))
.addMBB(TBB)
.addReg(AMDGPU::PREDICATE_BIT, RegState::Kill);
BuildMI(&MBB, DL, get(AMDGPU::JUMP)).addMBB(FBB);
MachineBasicBlock::iterator CfAlu = FindLastAluClause(MBB);
if (CfAlu == MBB.end())
return 2;
assert (CfAlu->getOpcode() == AMDGPU::CF_ALU);
CfAlu->setDesc(get(AMDGPU::CF_ALU_PUSH_BEFORE));
return 2;
}
}
unsigned
R600InstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
// Note : we leave PRED* instructions there.
// They may be needed when predicating instructions.
MachineBasicBlock::iterator I = MBB.end();
if (I == MBB.begin()) {
return 0;
}
--I;
switch (I->getOpcode()) {
default:
return 0;
case AMDGPU::JUMP_COND: {
MachineInstr *predSet = findFirstPredicateSetterFrom(MBB, I);
clearFlag(predSet, 0, MO_FLAG_PUSH);
I->eraseFromParent();
MachineBasicBlock::iterator CfAlu = FindLastAluClause(MBB);
if (CfAlu == MBB.end())
break;
assert (CfAlu->getOpcode() == AMDGPU::CF_ALU_PUSH_BEFORE);
CfAlu->setDesc(get(AMDGPU::CF_ALU));
break;
}
case AMDGPU::JUMP:
I->eraseFromParent();
break;
}
I = MBB.end();
if (I == MBB.begin()) {
return 1;
}
--I;
switch (I->getOpcode()) {
// FIXME: only one case??
default:
return 1;
case AMDGPU::JUMP_COND: {
MachineInstr *predSet = findFirstPredicateSetterFrom(MBB, I);
clearFlag(predSet, 0, MO_FLAG_PUSH);
I->eraseFromParent();
MachineBasicBlock::iterator CfAlu = FindLastAluClause(MBB);
if (CfAlu == MBB.end())
break;
assert (CfAlu->getOpcode() == AMDGPU::CF_ALU_PUSH_BEFORE);
CfAlu->setDesc(get(AMDGPU::CF_ALU));
break;
}
case AMDGPU::JUMP:
I->eraseFromParent();
break;
}
return 2;
}
bool
R600InstrInfo::isPredicated(const MachineInstr *MI) const {
int idx = MI->findFirstPredOperandIdx();
if (idx < 0)
return false;
unsigned Reg = MI->getOperand(idx).getReg();
switch (Reg) {
default: return false;
case AMDGPU::PRED_SEL_ONE:
case AMDGPU::PRED_SEL_ZERO:
case AMDGPU::PREDICATE_BIT:
return true;
}
}
bool
R600InstrInfo::isPredicable(MachineInstr *MI) const {
// XXX: KILL* instructions can be predicated, but they must be the last
// instruction in a clause, so this means any instructions after them cannot
// be predicated. Until we have proper support for instruction clauses in the
// backend, we will mark KILL* instructions as unpredicable.
if (MI->getOpcode() == AMDGPU::KILLGT) {
return false;
} else if (MI->getOpcode() == AMDGPU::CF_ALU) {
// If the clause start in the middle of MBB then the MBB has more
// than a single clause, unable to predicate several clauses.
if (MI->getParent()->begin() != MachineBasicBlock::iterator(MI))
return false;
// TODO: We don't support KC merging atm
if (MI->getOperand(3).getImm() != 0 || MI->getOperand(4).getImm() != 0)
return false;
return true;
} else if (isVector(*MI)) {
return false;
} else {
return AMDGPUInstrInfo::isPredicable(MI);
}
}
bool
R600InstrInfo::isProfitableToIfCvt(MachineBasicBlock &MBB,
unsigned NumCyles,
unsigned ExtraPredCycles,
const BranchProbability &Probability) const{
return true;
}
bool
R600InstrInfo::isProfitableToIfCvt(MachineBasicBlock &TMBB,
unsigned NumTCycles,
unsigned ExtraTCycles,
MachineBasicBlock &FMBB,
unsigned NumFCycles,
unsigned ExtraFCycles,
const BranchProbability &Probability) const {
return true;
}
bool
R600InstrInfo::isProfitableToDupForIfCvt(MachineBasicBlock &MBB,
unsigned NumCyles,
const BranchProbability &Probability)
const {
return true;
}
bool
R600InstrInfo::isProfitableToUnpredicate(MachineBasicBlock &TMBB,
MachineBasicBlock &FMBB) const {
return false;
}
bool
R600InstrInfo::ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
MachineOperand &MO = Cond[1];
switch (MO.getImm()) {
case OPCODE_IS_ZERO_INT:
MO.setImm(OPCODE_IS_NOT_ZERO_INT);
break;
case OPCODE_IS_NOT_ZERO_INT:
MO.setImm(OPCODE_IS_ZERO_INT);
break;
case OPCODE_IS_ZERO:
MO.setImm(OPCODE_IS_NOT_ZERO);
break;
case OPCODE_IS_NOT_ZERO:
MO.setImm(OPCODE_IS_ZERO);
break;
default:
return true;
}
MachineOperand &MO2 = Cond[2];
switch (MO2.getReg()) {
case AMDGPU::PRED_SEL_ZERO:
MO2.setReg(AMDGPU::PRED_SEL_ONE);
break;
case AMDGPU::PRED_SEL_ONE:
MO2.setReg(AMDGPU::PRED_SEL_ZERO);
break;
default:
return true;
}
return false;
}
bool
R600InstrInfo::DefinesPredicate(MachineInstr *MI,
std::vector<MachineOperand> &Pred) const {
return isPredicateSetter(MI->getOpcode());
}
bool
R600InstrInfo::SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
const SmallVectorImpl<MachineOperand> &Pred2) const {
return false;
}
bool
R600InstrInfo::PredicateInstruction(MachineInstr *MI,
const SmallVectorImpl<MachineOperand> &Pred) const {
int PIdx = MI->findFirstPredOperandIdx();
if (MI->getOpcode() == AMDGPU::CF_ALU) {
MI->getOperand(8).setImm(0);
return true;
}
if (PIdx != -1) {
MachineOperand &PMO = MI->getOperand(PIdx);
PMO.setReg(Pred[2].getReg());
MachineInstrBuilder MIB(*MI->getParent()->getParent(), MI);
MIB.addReg(AMDGPU::PREDICATE_BIT, RegState::Implicit);
return true;
}
return false;
}
unsigned int R600InstrInfo::getPredicationCost(const MachineInstr *) const {
return 2;
}
unsigned int R600InstrInfo::getInstrLatency(const InstrItineraryData *ItinData,
const MachineInstr *MI,
unsigned *PredCost) const {
if (PredCost)
*PredCost = 2;
return 2;
}
int R600InstrInfo::getIndirectIndexBegin(const MachineFunction &MF) const {
const MachineRegisterInfo &MRI = MF.getRegInfo();
const MachineFrameInfo *MFI = MF.getFrameInfo();
int Offset = 0;
if (MFI->getNumObjects() == 0) {
return -1;
}
if (MRI.livein_empty()) {
return 0;
}
for (MachineRegisterInfo::livein_iterator LI = MRI.livein_begin(),
LE = MRI.livein_end();
LI != LE; ++LI) {
Offset = std::max(Offset,
GET_REG_INDEX(RI.getEncodingValue(LI->first)));
}
return Offset + 1;
}
int R600InstrInfo::getIndirectIndexEnd(const MachineFunction &MF) const {
int Offset = 0;
const MachineFrameInfo *MFI = MF.getFrameInfo();
// Variable sized objects are not supported
assert(!MFI->hasVarSizedObjects());
if (MFI->getNumObjects() == 0) {
return -1;
}
Offset = TM.getFrameLowering()->getFrameIndexOffset(MF, -1);
return getIndirectIndexBegin(MF) + Offset;
}
std::vector<unsigned> R600InstrInfo::getIndirectReservedRegs(
const MachineFunction &MF) const {
const AMDGPUFrameLowering *TFL =
static_cast<const AMDGPUFrameLowering*>(TM.getFrameLowering());
std::vector<unsigned> Regs;
unsigned StackWidth = TFL->getStackWidth(MF);
int End = getIndirectIndexEnd(MF);
if (End == -1) {
return Regs;
}
for (int Index = getIndirectIndexBegin(MF); Index <= End; ++Index) {
unsigned SuperReg = AMDGPU::R600_Reg128RegClass.getRegister(Index);
Regs.push_back(SuperReg);
for (unsigned Chan = 0; Chan < StackWidth; ++Chan) {
unsigned Reg = AMDGPU::R600_TReg32RegClass.getRegister((4 * Index) + Chan);
Regs.push_back(Reg);
}
}
return Regs;
}
unsigned R600InstrInfo::calculateIndirectAddress(unsigned RegIndex,
unsigned Channel) const {
// XXX: Remove when we support a stack width > 2
assert(Channel == 0);
return RegIndex;
}
const TargetRegisterClass *R600InstrInfo::getIndirectAddrRegClass() const {
return &AMDGPU::R600_TReg32_XRegClass;
}
MachineInstrBuilder R600InstrInfo::buildIndirectWrite(MachineBasicBlock *MBB,
MachineBasicBlock::iterator I,
unsigned ValueReg, unsigned Address,
unsigned OffsetReg) const {
unsigned AddrReg = AMDGPU::R600_AddrRegClass.getRegister(Address);
MachineInstr *MOVA = buildDefaultInstruction(*MBB, I, AMDGPU::MOVA_INT_eg,
AMDGPU::AR_X, OffsetReg);
setImmOperand(MOVA, AMDGPU::OpName::write, 0);
MachineInstrBuilder Mov = buildDefaultInstruction(*MBB, I, AMDGPU::MOV,
AddrReg, ValueReg)
.addReg(AMDGPU::AR_X,
RegState::Implicit | RegState::Kill);
setImmOperand(Mov, AMDGPU::OpName::dst_rel, 1);
return Mov;
}
MachineInstrBuilder R600InstrInfo::buildIndirectRead(MachineBasicBlock *MBB,
MachineBasicBlock::iterator I,
unsigned ValueReg, unsigned Address,
unsigned OffsetReg) const {
unsigned AddrReg = AMDGPU::R600_AddrRegClass.getRegister(Address);
MachineInstr *MOVA = buildDefaultInstruction(*MBB, I, AMDGPU::MOVA_INT_eg,
AMDGPU::AR_X,
OffsetReg);
setImmOperand(MOVA, AMDGPU::OpName::write, 0);
MachineInstrBuilder Mov = buildDefaultInstruction(*MBB, I, AMDGPU::MOV,
ValueReg,
AddrReg)
.addReg(AMDGPU::AR_X,
RegState::Implicit | RegState::Kill);
setImmOperand(Mov, AMDGPU::OpName::src0_rel, 1);
return Mov;
}
unsigned R600InstrInfo::getMaxAlusPerClause() const {
return 115;
}
MachineInstrBuilder R600InstrInfo::buildDefaultInstruction(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned Opcode,
unsigned DstReg,
unsigned Src0Reg,
unsigned Src1Reg) const {
MachineInstrBuilder MIB = BuildMI(MBB, I, MBB.findDebugLoc(I), get(Opcode),
DstReg); // $dst
if (Src1Reg) {
MIB.addImm(0) // $update_exec_mask
.addImm(0); // $update_predicate
}
MIB.addImm(1) // $write
.addImm(0) // $omod
.addImm(0) // $dst_rel
.addImm(0) // $dst_clamp
.addReg(Src0Reg) // $src0
.addImm(0) // $src0_neg
.addImm(0) // $src0_rel
.addImm(0) // $src0_abs
.addImm(-1); // $src0_sel
if (Src1Reg) {
MIB.addReg(Src1Reg) // $src1
.addImm(0) // $src1_neg
.addImm(0) // $src1_rel
.addImm(0) // $src1_abs
.addImm(-1); // $src1_sel
}
//XXX: The r600g finalizer expects this to be 1, once we've moved the
//scheduling to the backend, we can change the default to 0.
MIB.addImm(1) // $last
.addReg(AMDGPU::PRED_SEL_OFF) // $pred_sel
.addImm(0) // $literal
.addImm(0); // $bank_swizzle
return MIB;
}
#define OPERAND_CASE(Label) \
case Label: { \
static const unsigned Ops[] = \
{ \
Label##_X, \
Label##_Y, \
Label##_Z, \
Label##_W \
}; \
return Ops[Slot]; \
}
static unsigned getSlotedOps(unsigned Op, unsigned Slot) {
switch (Op) {
OPERAND_CASE(AMDGPU::OpName::update_exec_mask)
OPERAND_CASE(AMDGPU::OpName::update_pred)
OPERAND_CASE(AMDGPU::OpName::write)
OPERAND_CASE(AMDGPU::OpName::omod)
OPERAND_CASE(AMDGPU::OpName::dst_rel)
OPERAND_CASE(AMDGPU::OpName::clamp)
OPERAND_CASE(AMDGPU::OpName::src0)
OPERAND_CASE(AMDGPU::OpName::src0_neg)
OPERAND_CASE(AMDGPU::OpName::src0_rel)
OPERAND_CASE(AMDGPU::OpName::src0_abs)
OPERAND_CASE(AMDGPU::OpName::src0_sel)
OPERAND_CASE(AMDGPU::OpName::src1)
OPERAND_CASE(AMDGPU::OpName::src1_neg)
OPERAND_CASE(AMDGPU::OpName::src1_rel)
OPERAND_CASE(AMDGPU::OpName::src1_abs)
OPERAND_CASE(AMDGPU::OpName::src1_sel)
OPERAND_CASE(AMDGPU::OpName::pred_sel)
default:
llvm_unreachable("Wrong Operand");
}
}
#undef OPERAND_CASE
MachineInstr *R600InstrInfo::buildSlotOfVectorInstruction(
MachineBasicBlock &MBB, MachineInstr *MI, unsigned Slot, unsigned DstReg)
const {
assert (MI->getOpcode() == AMDGPU::DOT_4 && "Not Implemented");
unsigned Opcode;
const AMDGPUSubtarget &ST = TM.getSubtarget<AMDGPUSubtarget>();
if (ST.getGeneration() <= AMDGPUSubtarget::R700)
Opcode = AMDGPU::DOT4_r600;
else
Opcode = AMDGPU::DOT4_eg;
MachineBasicBlock::iterator I = MI;
MachineOperand &Src0 = MI->getOperand(
getOperandIdx(MI->getOpcode(), getSlotedOps(AMDGPU::OpName::src0, Slot)));
MachineOperand &Src1 = MI->getOperand(
getOperandIdx(MI->getOpcode(), getSlotedOps(AMDGPU::OpName::src1, Slot)));
MachineInstr *MIB = buildDefaultInstruction(
MBB, I, Opcode, DstReg, Src0.getReg(), Src1.getReg());
static const unsigned Operands[14] = {
AMDGPU::OpName::update_exec_mask,
AMDGPU::OpName::update_pred,
AMDGPU::OpName::write,
AMDGPU::OpName::omod,
AMDGPU::OpName::dst_rel,
AMDGPU::OpName::clamp,
AMDGPU::OpName::src0_neg,
AMDGPU::OpName::src0_rel,
AMDGPU::OpName::src0_abs,
AMDGPU::OpName::src0_sel,
AMDGPU::OpName::src1_neg,
AMDGPU::OpName::src1_rel,
AMDGPU::OpName::src1_abs,
AMDGPU::OpName::src1_sel,
};
for (unsigned i = 0; i < 14; i++) {
MachineOperand &MO = MI->getOperand(
getOperandIdx(MI->getOpcode(), getSlotedOps(Operands[i], Slot)));
assert (MO.isImm());
setImmOperand(MIB, Operands[i], MO.getImm());
}
MIB->getOperand(20).setImm(0);
return MIB;
}
MachineInstr *R600InstrInfo::buildMovImm(MachineBasicBlock &BB,
MachineBasicBlock::iterator I,
unsigned DstReg,
uint64_t Imm) const {
MachineInstr *MovImm = buildDefaultInstruction(BB, I, AMDGPU::MOV, DstReg,
AMDGPU::ALU_LITERAL_X);
setImmOperand(MovImm, AMDGPU::OpName::literal, Imm);
return MovImm;
}
MachineInstr *R600InstrInfo::buildMovInstr(MachineBasicBlock *MBB,
MachineBasicBlock::iterator I,
unsigned DstReg, unsigned SrcReg) const {
return buildDefaultInstruction(*MBB, I, AMDGPU::MOV, DstReg, SrcReg);
}
int R600InstrInfo::getOperandIdx(const MachineInstr &MI, unsigned Op) const {
return getOperandIdx(MI.getOpcode(), Op);
}
int R600InstrInfo::getOperandIdx(unsigned Opcode, unsigned Op) const {
return AMDGPU::getNamedOperandIdx(Opcode, Op);
}
void R600InstrInfo::setImmOperand(MachineInstr *MI, unsigned Op,
int64_t Imm) const {
int Idx = getOperandIdx(*MI, Op);
assert(Idx != -1 && "Operand not supported for this instruction.");
assert(MI->getOperand(Idx).isImm());
MI->getOperand(Idx).setImm(Imm);
}
//===----------------------------------------------------------------------===//
// Instruction flag getters/setters
//===----------------------------------------------------------------------===//
bool R600InstrInfo::hasFlagOperand(const MachineInstr &MI) const {
return GET_FLAG_OPERAND_IDX(get(MI.getOpcode()).TSFlags) != 0;
}
MachineOperand &R600InstrInfo::getFlagOp(MachineInstr *MI, unsigned SrcIdx,
unsigned Flag) const {
unsigned TargetFlags = get(MI->getOpcode()).TSFlags;
int FlagIndex = 0;
if (Flag != 0) {
// If we pass something other than the default value of Flag to this
// function, it means we are want to set a flag on an instruction
// that uses native encoding.
assert(HAS_NATIVE_OPERANDS(TargetFlags));
bool IsOP3 = (TargetFlags & R600_InstFlag::OP3) == R600_InstFlag::OP3;
switch (Flag) {
case MO_FLAG_CLAMP:
FlagIndex = getOperandIdx(*MI, AMDGPU::OpName::clamp);
break;
case MO_FLAG_MASK:
FlagIndex = getOperandIdx(*MI, AMDGPU::OpName::write);
break;
case MO_FLAG_NOT_LAST:
case MO_FLAG_LAST:
FlagIndex = getOperandIdx(*MI, AMDGPU::OpName::last);
break;
case MO_FLAG_NEG:
switch (SrcIdx) {
case 0: FlagIndex = getOperandIdx(*MI, AMDGPU::OpName::src0_neg); break;
case 1: FlagIndex = getOperandIdx(*MI, AMDGPU::OpName::src1_neg); break;
case 2: FlagIndex = getOperandIdx(*MI, AMDGPU::OpName::src2_neg); break;
}
break;
case MO_FLAG_ABS:
assert(!IsOP3 && "Cannot set absolute value modifier for OP3 "
"instructions.");
(void)IsOP3;
switch (SrcIdx) {
case 0: FlagIndex = getOperandIdx(*MI, AMDGPU::OpName::src0_abs); break;
case 1: FlagIndex = getOperandIdx(*MI, AMDGPU::OpName::src1_abs); break;
}
break;
default:
FlagIndex = -1;
break;
}
assert(FlagIndex != -1 && "Flag not supported for this instruction");
} else {
FlagIndex = GET_FLAG_OPERAND_IDX(TargetFlags);
assert(FlagIndex != 0 &&
"Instruction flags not supported for this instruction");
}
MachineOperand &FlagOp = MI->getOperand(FlagIndex);
assert(FlagOp.isImm());
return FlagOp;
}
void R600InstrInfo::addFlag(MachineInstr *MI, unsigned Operand,
unsigned Flag) const {
unsigned TargetFlags = get(MI->getOpcode()).TSFlags;
if (Flag == 0) {
return;
}
if (HAS_NATIVE_OPERANDS(TargetFlags)) {
MachineOperand &FlagOp = getFlagOp(MI, Operand, Flag);
if (Flag == MO_FLAG_NOT_LAST) {
clearFlag(MI, Operand, MO_FLAG_LAST);
} else if (Flag == MO_FLAG_MASK) {
clearFlag(MI, Operand, Flag);
} else {
FlagOp.setImm(1);
}
} else {
MachineOperand &FlagOp = getFlagOp(MI, Operand);
FlagOp.setImm(FlagOp.getImm() | (Flag << (NUM_MO_FLAGS * Operand)));
}
}
void R600InstrInfo::clearFlag(MachineInstr *MI, unsigned Operand,
unsigned Flag) const {
unsigned TargetFlags = get(MI->getOpcode()).TSFlags;
if (HAS_NATIVE_OPERANDS(TargetFlags)) {
MachineOperand &FlagOp = getFlagOp(MI, Operand, Flag);
FlagOp.setImm(0);
} else {
MachineOperand &FlagOp = getFlagOp(MI);
unsigned InstFlags = FlagOp.getImm();
InstFlags &= ~(Flag << (NUM_MO_FLAGS * Operand));
FlagOp.setImm(InstFlags);
}
}
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