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clang-p2996/llvm/lib/Target/AMDGPU/SIMachineFunctionInfo.cpp
Matt Arsenault 21d2884a9c AMDGPU: Annotate functions that have stack objects 
Relying on any MachineFunction state in the MachineFunctionInfo
constructor is hazardous, because the construction time is unclear and
determined by the first use. The function may be only partially
constructed, which is part of why we have many of these hacky string
attributes to track what we need for ABI lowering.

For SelectionDAG, all stack objects are created up-front before
calling convention lowering so stack objects are visible at
construction time. For GlobalISel, none of the IR function has been
visited yet and the allocas haven't been added to the MachineFrameInfo
yet. This should fix failing to set flat_scratch_init in GlobalISel
when needed.

This pass really needs to be turned into some kind of analysis, but I
haven't found a nice way use one here.
2020-05-19 18:51:00 -04:00

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//===- SIMachineFunctionInfo.cpp - SI Machine Function Info ---------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "SIMachineFunctionInfo.h"
#include "AMDGPUArgumentUsageInfo.h"
#include "AMDGPUTargetMachine.h"
#include "AMDGPUSubtarget.h"
#include "SIRegisterInfo.h"
#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
#include "Utils/AMDGPUBaseInfo.h"
#include "llvm/ADT/Optional.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Function.h"
#include <cassert>
#include <vector>
#define MAX_LANES 64
using namespace llvm;
SIMachineFunctionInfo::SIMachineFunctionInfo(const MachineFunction &MF)
: AMDGPUMachineFunction(MF),
PrivateSegmentBuffer(false),
DispatchPtr(false),
QueuePtr(false),
KernargSegmentPtr(false),
DispatchID(false),
FlatScratchInit(false),
WorkGroupIDX(false),
WorkGroupIDY(false),
WorkGroupIDZ(false),
WorkGroupInfo(false),
PrivateSegmentWaveByteOffset(false),
WorkItemIDX(false),
WorkItemIDY(false),
WorkItemIDZ(false),
ImplicitBufferPtr(false),
ImplicitArgPtr(false),
GITPtrHigh(0xffffffff),
HighBitsOf32BitAddress(0),
GDSSize(0) {
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
const Function &F = MF.getFunction();
FlatWorkGroupSizes = ST.getFlatWorkGroupSizes(F);
WavesPerEU = ST.getWavesPerEU(F);
Occupancy = ST.computeOccupancy(MF, getLDSSize());
CallingConv::ID CC = F.getCallingConv();
// FIXME: Should have analysis or something rather than attribute to detect
// calls.
const bool HasCalls = F.hasFnAttribute("amdgpu-calls");
// Enable all kernel inputs if we have the fixed ABI. Don't bother if we don't
// have any calls.
const bool UseFixedABI = AMDGPUTargetMachine::EnableFixedFunctionABI &&
(!isEntryFunction() || HasCalls);
if (CC == CallingConv::AMDGPU_KERNEL || CC == CallingConv::SPIR_KERNEL) {
if (!F.arg_empty())
KernargSegmentPtr = true;
WorkGroupIDX = true;
WorkItemIDX = true;
} else if (CC == CallingConv::AMDGPU_PS) {
PSInputAddr = AMDGPU::getInitialPSInputAddr(F);
}
if (!isEntryFunction()) {
// Non-entry functions have no special inputs for now, other registers
// required for scratch access.
ScratchRSrcReg = AMDGPU::SGPR0_SGPR1_SGPR2_SGPR3;
// TODO: Pick a high register, and shift down, similar to a kernel.
FrameOffsetReg = AMDGPU::SGPR33;
StackPtrOffsetReg = AMDGPU::SGPR32;
ArgInfo.PrivateSegmentBuffer =
ArgDescriptor::createRegister(ScratchRSrcReg);
if (F.hasFnAttribute("amdgpu-implicitarg-ptr"))
ImplicitArgPtr = true;
} else {
if (F.hasFnAttribute("amdgpu-implicitarg-ptr")) {
KernargSegmentPtr = true;
MaxKernArgAlign = std::max(ST.getAlignmentForImplicitArgPtr(),
MaxKernArgAlign);
}
}
if (UseFixedABI) {
WorkGroupIDX = true;
WorkGroupIDY = true;
WorkGroupIDZ = true;
WorkItemIDX = true;
WorkItemIDY = true;
WorkItemIDZ = true;
ImplicitArgPtr = true;
} else {
if (F.hasFnAttribute("amdgpu-work-group-id-x"))
WorkGroupIDX = true;
if (F.hasFnAttribute("amdgpu-work-group-id-y"))
WorkGroupIDY = true;
if (F.hasFnAttribute("amdgpu-work-group-id-z"))
WorkGroupIDZ = true;
if (F.hasFnAttribute("amdgpu-work-item-id-x"))
WorkItemIDX = true;
if (F.hasFnAttribute("amdgpu-work-item-id-y"))
WorkItemIDY = true;
if (F.hasFnAttribute("amdgpu-work-item-id-z"))
WorkItemIDZ = true;
}
bool HasStackObjects = F.hasFnAttribute("amdgpu-stack-objects");
if (isEntryFunction()) {
// X, XY, and XYZ are the only supported combinations, so make sure Y is
// enabled if Z is.
if (WorkItemIDZ)
WorkItemIDY = true;
PrivateSegmentWaveByteOffset = true;
// HS and GS always have the scratch wave offset in SGPR5 on GFX9.
if (ST.getGeneration() >= AMDGPUSubtarget::GFX9 &&
(CC == CallingConv::AMDGPU_HS || CC == CallingConv::AMDGPU_GS))
ArgInfo.PrivateSegmentWaveByteOffset =
ArgDescriptor::createRegister(AMDGPU::SGPR5);
}
bool isAmdHsaOrMesa = ST.isAmdHsaOrMesa(F);
if (isAmdHsaOrMesa) {
PrivateSegmentBuffer = true;
if (UseFixedABI) {
DispatchPtr = true;
QueuePtr = true;
// FIXME: We don't need this?
DispatchID = true;
} else {
if (F.hasFnAttribute("amdgpu-dispatch-ptr"))
DispatchPtr = true;
if (F.hasFnAttribute("amdgpu-queue-ptr"))
QueuePtr = true;
if (F.hasFnAttribute("amdgpu-dispatch-id"))
DispatchID = true;
}
} else if (ST.isMesaGfxShader(F)) {
ImplicitBufferPtr = true;
}
if (UseFixedABI || F.hasFnAttribute("amdgpu-kernarg-segment-ptr"))
KernargSegmentPtr = true;
if (ST.hasFlatAddressSpace() && isEntryFunction() && isAmdHsaOrMesa) {
// TODO: This could be refined a lot. The attribute is a poor way of
// detecting calls or stack objects that may require it before argument
// lowering.
if (HasCalls || HasStackObjects)
FlatScratchInit = true;
}
Attribute A = F.getFnAttribute("amdgpu-git-ptr-high");
StringRef S = A.getValueAsString();
if (!S.empty())
S.consumeInteger(0, GITPtrHigh);
A = F.getFnAttribute("amdgpu-32bit-address-high-bits");
S = A.getValueAsString();
if (!S.empty())
S.consumeInteger(0, HighBitsOf32BitAddress);
S = F.getFnAttribute("amdgpu-gds-size").getValueAsString();
if (!S.empty())
S.consumeInteger(0, GDSSize);
}
void SIMachineFunctionInfo::limitOccupancy(const MachineFunction &MF) {
limitOccupancy(getMaxWavesPerEU());
const GCNSubtarget& ST = MF.getSubtarget<GCNSubtarget>();
limitOccupancy(ST.getOccupancyWithLocalMemSize(getLDSSize(),
MF.getFunction()));
}
Register SIMachineFunctionInfo::addPrivateSegmentBuffer(
const SIRegisterInfo &TRI) {
ArgInfo.PrivateSegmentBuffer =
ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SGPR_128RegClass));
NumUserSGPRs += 4;
return ArgInfo.PrivateSegmentBuffer.getRegister();
}
Register SIMachineFunctionInfo::addDispatchPtr(const SIRegisterInfo &TRI) {
ArgInfo.DispatchPtr = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
NumUserSGPRs += 2;
return ArgInfo.DispatchPtr.getRegister();
}
Register SIMachineFunctionInfo::addQueuePtr(const SIRegisterInfo &TRI) {
ArgInfo.QueuePtr = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
NumUserSGPRs += 2;
return ArgInfo.QueuePtr.getRegister();
}
Register SIMachineFunctionInfo::addKernargSegmentPtr(const SIRegisterInfo &TRI) {
ArgInfo.KernargSegmentPtr
= ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
NumUserSGPRs += 2;
return ArgInfo.KernargSegmentPtr.getRegister();
}
Register SIMachineFunctionInfo::addDispatchID(const SIRegisterInfo &TRI) {
ArgInfo.DispatchID = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
NumUserSGPRs += 2;
return ArgInfo.DispatchID.getRegister();
}
Register SIMachineFunctionInfo::addFlatScratchInit(const SIRegisterInfo &TRI) {
ArgInfo.FlatScratchInit = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
NumUserSGPRs += 2;
return ArgInfo.FlatScratchInit.getRegister();
}
Register SIMachineFunctionInfo::addImplicitBufferPtr(const SIRegisterInfo &TRI) {
ArgInfo.ImplicitBufferPtr = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
NumUserSGPRs += 2;
return ArgInfo.ImplicitBufferPtr.getRegister();
}
bool SIMachineFunctionInfo::isCalleeSavedReg(const MCPhysReg *CSRegs,
MCPhysReg Reg) {
for (unsigned I = 0; CSRegs[I]; ++I) {
if (CSRegs[I] == Reg)
return true;
}
return false;
}
/// \p returns true if \p NumLanes slots are available in VGPRs already used for
/// SGPR spilling.
//
// FIXME: This only works after processFunctionBeforeFrameFinalized
bool SIMachineFunctionInfo::haveFreeLanesForSGPRSpill(const MachineFunction &MF,
unsigned NumNeed) const {
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
unsigned WaveSize = ST.getWavefrontSize();
return NumVGPRSpillLanes + NumNeed <= WaveSize * SpillVGPRs.size();
}
/// Reserve a slice of a VGPR to support spilling for FrameIndex \p FI.
bool SIMachineFunctionInfo::allocateSGPRSpillToVGPR(MachineFunction &MF,
int FI) {
std::vector<SpilledReg> &SpillLanes = SGPRToVGPRSpills[FI];
// This has already been allocated.
if (!SpillLanes.empty())
return true;
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
const SIRegisterInfo *TRI = ST.getRegisterInfo();
MachineFrameInfo &FrameInfo = MF.getFrameInfo();
MachineRegisterInfo &MRI = MF.getRegInfo();
unsigned WaveSize = ST.getWavefrontSize();
SIMachineFunctionInfo *FuncInfo = MF.getInfo<SIMachineFunctionInfo>();
unsigned Size = FrameInfo.getObjectSize(FI);
assert(Size >= 4 && Size <= 64 && "invalid sgpr spill size");
assert(TRI->spillSGPRToVGPR() && "not spilling SGPRs to VGPRs");
int NumLanes = Size / 4;
const MCPhysReg *CSRegs = MRI.getCalleeSavedRegs();
// Make sure to handle the case where a wide SGPR spill may span between two
// VGPRs.
for (int I = 0; I < NumLanes; ++I, ++NumVGPRSpillLanes) {
Register LaneVGPR;
unsigned VGPRIndex = (NumVGPRSpillLanes % WaveSize);
if (VGPRIndex == 0 && !FuncInfo->VGPRReservedForSGPRSpill) {
LaneVGPR = TRI->findUnusedRegister(MRI, &AMDGPU::VGPR_32RegClass, MF);
if (LaneVGPR == AMDGPU::NoRegister) {
// We have no VGPRs left for spilling SGPRs. Reset because we will not
// partially spill the SGPR to VGPRs.
SGPRToVGPRSpills.erase(FI);
NumVGPRSpillLanes -= I;
return false;
}
Optional<int> CSRSpillFI;
if ((FrameInfo.hasCalls() || !isEntryFunction()) && CSRegs &&
isCalleeSavedReg(CSRegs, LaneVGPR)) {
CSRSpillFI = FrameInfo.CreateSpillStackObject(4, Align(4));
}
SpillVGPRs.push_back(SGPRSpillVGPRCSR(LaneVGPR, CSRSpillFI));
// Add this register as live-in to all blocks to avoid machine verifer
// complaining about use of an undefined physical register.
for (MachineBasicBlock &BB : MF)
BB.addLiveIn(LaneVGPR);
} else {
LaneVGPR = SpillVGPRs.back().VGPR;
}
SpillLanes.push_back(SpilledReg(LaneVGPR, VGPRIndex));
}
return true;
}
/// Reserve a VGPR for spilling of SGPRs
bool SIMachineFunctionInfo::reserveVGPRforSGPRSpills(MachineFunction &MF) {
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
const SIRegisterInfo *TRI = ST.getRegisterInfo();
SIMachineFunctionInfo *FuncInfo = MF.getInfo<SIMachineFunctionInfo>();
Register LaneVGPR = TRI->findUnusedRegister(
MF.getRegInfo(), &AMDGPU::VGPR_32RegClass, MF, true);
SpillVGPRs.push_back(SGPRSpillVGPRCSR(LaneVGPR, None));
FuncInfo->VGPRReservedForSGPRSpill = LaneVGPR;
return true;
}
/// Reserve AGPRs or VGPRs to support spilling for FrameIndex \p FI.
/// Either AGPR is spilled to VGPR to vice versa.
/// Returns true if a \p FI can be eliminated completely.
bool SIMachineFunctionInfo::allocateVGPRSpillToAGPR(MachineFunction &MF,
int FI,
bool isAGPRtoVGPR) {
MachineRegisterInfo &MRI = MF.getRegInfo();
MachineFrameInfo &FrameInfo = MF.getFrameInfo();
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
assert(ST.hasMAIInsts() && FrameInfo.isSpillSlotObjectIndex(FI));
auto &Spill = VGPRToAGPRSpills[FI];
// This has already been allocated.
if (!Spill.Lanes.empty())
return Spill.FullyAllocated;
unsigned Size = FrameInfo.getObjectSize(FI);
unsigned NumLanes = Size / 4;
Spill.Lanes.resize(NumLanes, AMDGPU::NoRegister);
const TargetRegisterClass &RC =
isAGPRtoVGPR ? AMDGPU::VGPR_32RegClass : AMDGPU::AGPR_32RegClass;
auto Regs = RC.getRegisters();
auto &SpillRegs = isAGPRtoVGPR ? SpillAGPR : SpillVGPR;
const SIRegisterInfo *TRI = ST.getRegisterInfo();
Spill.FullyAllocated = true;
// FIXME: Move allocation logic out of MachineFunctionInfo and initialize
// once.
BitVector OtherUsedRegs;
OtherUsedRegs.resize(TRI->getNumRegs());
const uint32_t *CSRMask =
TRI->getCallPreservedMask(MF, MF.getFunction().getCallingConv());
if (CSRMask)
OtherUsedRegs.setBitsInMask(CSRMask);
// TODO: Should include register tuples, but doesn't matter with current
// usage.
for (MCPhysReg Reg : SpillAGPR)
OtherUsedRegs.set(Reg);
for (MCPhysReg Reg : SpillVGPR)
OtherUsedRegs.set(Reg);
SmallVectorImpl<MCPhysReg>::const_iterator NextSpillReg = Regs.begin();
for (unsigned I = 0; I < NumLanes; ++I) {
NextSpillReg = std::find_if(
NextSpillReg, Regs.end(), [&MRI, &OtherUsedRegs](MCPhysReg Reg) {
return MRI.isAllocatable(Reg) && !MRI.isPhysRegUsed(Reg) &&
!OtherUsedRegs[Reg];
});
if (NextSpillReg == Regs.end()) { // Registers exhausted
Spill.FullyAllocated = false;
break;
}
OtherUsedRegs.set(*NextSpillReg);
SpillRegs.push_back(*NextSpillReg);
Spill.Lanes[I] = *NextSpillReg++;
}
return Spill.FullyAllocated;
}
void SIMachineFunctionInfo::removeDeadFrameIndices(MachineFrameInfo &MFI) {
// The FP & BP spills haven't been inserted yet, so keep them around.
for (auto &R : SGPRToVGPRSpills) {
if (R.first != FramePointerSaveIndex && R.first != BasePointerSaveIndex)
MFI.RemoveStackObject(R.first);
}
// All other SPGRs must be allocated on the default stack, so reset the stack
// ID.
for (int i = MFI.getObjectIndexBegin(), e = MFI.getObjectIndexEnd(); i != e;
++i)
if (i != FramePointerSaveIndex && i != BasePointerSaveIndex)
MFI.setStackID(i, TargetStackID::Default);
for (auto &R : VGPRToAGPRSpills) {
if (R.second.FullyAllocated)
MFI.RemoveStackObject(R.first);
}
}
MCPhysReg SIMachineFunctionInfo::getNextUserSGPR() const {
assert(NumSystemSGPRs == 0 && "System SGPRs must be added after user SGPRs");
return AMDGPU::SGPR0 + NumUserSGPRs;
}
MCPhysReg SIMachineFunctionInfo::getNextSystemSGPR() const {
return AMDGPU::SGPR0 + NumUserSGPRs + NumSystemSGPRs;
}
Register
SIMachineFunctionInfo::getGITPtrLoReg(const MachineFunction &MF) const {
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
if (!ST.isAmdPalOS())
return Register();
Register GitPtrLo = AMDGPU::SGPR0; // Low GIT address passed in
if (ST.hasMergedShaders()) {
switch (MF.getFunction().getCallingConv()) {
case CallingConv::AMDGPU_HS:
case CallingConv::AMDGPU_GS:
// Low GIT address is passed in s8 rather than s0 for an LS+HS or
// ES+GS merged shader on gfx9+.
GitPtrLo = AMDGPU::SGPR8;
return GitPtrLo;
default:
return GitPtrLo;
}
}
return GitPtrLo;
}
static yaml::StringValue regToString(Register Reg,
const TargetRegisterInfo &TRI) {
yaml::StringValue Dest;
{
raw_string_ostream OS(Dest.Value);
OS << printReg(Reg, &TRI);
}
return Dest;
}
static Optional<yaml::SIArgumentInfo>
convertArgumentInfo(const AMDGPUFunctionArgInfo &ArgInfo,
const TargetRegisterInfo &TRI) {
yaml::SIArgumentInfo AI;
auto convertArg = [&](Optional<yaml::SIArgument> &A,
const ArgDescriptor &Arg) {
if (!Arg)
return false;
// Create a register or stack argument.
yaml::SIArgument SA = yaml::SIArgument::createArgument(Arg.isRegister());
if (Arg.isRegister()) {
raw_string_ostream OS(SA.RegisterName.Value);
OS << printReg(Arg.getRegister(), &TRI);
} else
SA.StackOffset = Arg.getStackOffset();
// Check and update the optional mask.
if (Arg.isMasked())
SA.Mask = Arg.getMask();
A = SA;
return true;
};
bool Any = false;
Any |= convertArg(AI.PrivateSegmentBuffer, ArgInfo.PrivateSegmentBuffer);
Any |= convertArg(AI.DispatchPtr, ArgInfo.DispatchPtr);
Any |= convertArg(AI.QueuePtr, ArgInfo.QueuePtr);
Any |= convertArg(AI.KernargSegmentPtr, ArgInfo.KernargSegmentPtr);
Any |= convertArg(AI.DispatchID, ArgInfo.DispatchID);
Any |= convertArg(AI.FlatScratchInit, ArgInfo.FlatScratchInit);
Any |= convertArg(AI.PrivateSegmentSize, ArgInfo.PrivateSegmentSize);
Any |= convertArg(AI.WorkGroupIDX, ArgInfo.WorkGroupIDX);
Any |= convertArg(AI.WorkGroupIDY, ArgInfo.WorkGroupIDY);
Any |= convertArg(AI.WorkGroupIDZ, ArgInfo.WorkGroupIDZ);
Any |= convertArg(AI.WorkGroupInfo, ArgInfo.WorkGroupInfo);
Any |= convertArg(AI.PrivateSegmentWaveByteOffset,
ArgInfo.PrivateSegmentWaveByteOffset);
Any |= convertArg(AI.ImplicitArgPtr, ArgInfo.ImplicitArgPtr);
Any |= convertArg(AI.ImplicitBufferPtr, ArgInfo.ImplicitBufferPtr);
Any |= convertArg(AI.WorkItemIDX, ArgInfo.WorkItemIDX);
Any |= convertArg(AI.WorkItemIDY, ArgInfo.WorkItemIDY);
Any |= convertArg(AI.WorkItemIDZ, ArgInfo.WorkItemIDZ);
if (Any)
return AI;
return None;
}
yaml::SIMachineFunctionInfo::SIMachineFunctionInfo(
const llvm::SIMachineFunctionInfo& MFI,
const TargetRegisterInfo &TRI)
: ExplicitKernArgSize(MFI.getExplicitKernArgSize()),
MaxKernArgAlign(MFI.getMaxKernArgAlign()),
LDSSize(MFI.getLDSSize()),
IsEntryFunction(MFI.isEntryFunction()),
NoSignedZerosFPMath(MFI.hasNoSignedZerosFPMath()),
MemoryBound(MFI.isMemoryBound()),
WaveLimiter(MFI.needsWaveLimiter()),
HighBitsOf32BitAddress(MFI.get32BitAddressHighBits()),
ScratchRSrcReg(regToString(MFI.getScratchRSrcReg(), TRI)),
FrameOffsetReg(regToString(MFI.getFrameOffsetReg(), TRI)),
StackPtrOffsetReg(regToString(MFI.getStackPtrOffsetReg(), TRI)),
ArgInfo(convertArgumentInfo(MFI.getArgInfo(), TRI)),
Mode(MFI.getMode()) {}
void yaml::SIMachineFunctionInfo::mappingImpl(yaml::IO &YamlIO) {
MappingTraits<SIMachineFunctionInfo>::mapping(YamlIO, *this);
}
bool SIMachineFunctionInfo::initializeBaseYamlFields(
const yaml::SIMachineFunctionInfo &YamlMFI) {
ExplicitKernArgSize = YamlMFI.ExplicitKernArgSize;
MaxKernArgAlign = assumeAligned(YamlMFI.MaxKernArgAlign);
LDSSize = YamlMFI.LDSSize;
HighBitsOf32BitAddress = YamlMFI.HighBitsOf32BitAddress;
IsEntryFunction = YamlMFI.IsEntryFunction;
NoSignedZerosFPMath = YamlMFI.NoSignedZerosFPMath;
MemoryBound = YamlMFI.MemoryBound;
WaveLimiter = YamlMFI.WaveLimiter;
return false;
}
// Remove VGPR which was reserved for SGPR spills if there are no spilled SGPRs
bool SIMachineFunctionInfo::removeVGPRForSGPRSpill(Register ReservedVGPR,
MachineFunction &MF) {
for (auto *i = SpillVGPRs.begin(); i < SpillVGPRs.end(); i++) {
if (i->VGPR == ReservedVGPR) {
SpillVGPRs.erase(i);
for (MachineBasicBlock &MBB : MF) {
MBB.removeLiveIn(ReservedVGPR);
MBB.sortUniqueLiveIns();
}
this->VGPRReservedForSGPRSpill = AMDGPU::NoRegister;
return true;
}
}
return false;
}
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