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AMDGPUAsmPrinter.cpp
1329 lines (1137 loc) · 48.6 KB
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AMDGPUAsmPrinter.cpp
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//===-- AMDGPUAsmPrinter.cpp - AMDGPU assembly printer --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
///
/// The AMDGPUAsmPrinter is used to print both assembly string and also binary
/// code. When passed an MCAsmStreamer it prints assembly and when passed
/// an MCObjectStreamer it outputs binary code.
//
//===----------------------------------------------------------------------===//
//
#include "AMDGPUAsmPrinter.h"
#include "AMDGPU.h"
#include "AMDGPUSubtarget.h"
#include "AMDGPUTargetMachine.h"
#include "MCTargetDesc/AMDGPUInstPrinter.h"
#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
#include "MCTargetDesc/AMDGPUTargetStreamer.h"
#include "R600AsmPrinter.h"
#include "R600Defines.h"
#include "R600MachineFunctionInfo.h"
#include "R600RegisterInfo.h"
#include "SIDefines.h"
#include "SIInstrInfo.h"
#include "SIMachineFunctionInfo.h"
#include "SIRegisterInfo.h"
#include "TargetInfo/AMDGPUTargetInfo.h"
#include "Utils/AMDGPUBaseInfo.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/AMDGPUMetadata.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/TargetParser.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
using namespace llvm;
using namespace llvm::AMDGPU;
using namespace llvm::AMDGPU::HSAMD;
// This should get the default rounding mode from the kernel. We just set the
// default here, but this could change if the OpenCL rounding mode pragmas are
// used.
//
// The denormal mode here should match what is reported by the OpenCL runtime
// for the CL_FP_DENORM bit from CL_DEVICE_{HALF|SINGLE|DOUBLE}_FP_CONFIG, but
// can also be override to flush with the -cl-denorms-are-zero compiler flag.
//
// AMD OpenCL only sets flush none and reports CL_FP_DENORM for double
// precision, and leaves single precision to flush all and does not report
// CL_FP_DENORM for CL_DEVICE_SINGLE_FP_CONFIG. Mesa's OpenCL currently reports
// CL_FP_DENORM for both.
//
// FIXME: It seems some instructions do not support single precision denormals
// regardless of the mode (exp_*_f32, rcp_*_f32, rsq_*_f32, rsq_*f32, sqrt_f32,
// and sin_f32, cos_f32 on most parts).
// We want to use these instructions, and using fp32 denormals also causes
// instructions to run at the double precision rate for the device so it's
// probably best to just report no single precision denormals.
static uint32_t getFPMode(AMDGPU::SIModeRegisterDefaults Mode) {
return FP_ROUND_MODE_SP(FP_ROUND_ROUND_TO_NEAREST) |
FP_ROUND_MODE_DP(FP_ROUND_ROUND_TO_NEAREST) |
FP_DENORM_MODE_SP(Mode.fpDenormModeSPValue()) |
FP_DENORM_MODE_DP(Mode.fpDenormModeDPValue());
}
static AsmPrinter *
createAMDGPUAsmPrinterPass(TargetMachine &tm,
std::unique_ptr<MCStreamer> &&Streamer) {
return new AMDGPUAsmPrinter(tm, std::move(Streamer));
}
extern "C" void LLVM_EXTERNAL_VISIBILITY LLVMInitializeAMDGPUAsmPrinter() {
TargetRegistry::RegisterAsmPrinter(getTheAMDGPUTarget(),
llvm::createR600AsmPrinterPass);
TargetRegistry::RegisterAsmPrinter(getTheGCNTarget(),
createAMDGPUAsmPrinterPass);
}
AMDGPUAsmPrinter::AMDGPUAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer)
: AsmPrinter(TM, std::move(Streamer)) {
if (IsaInfo::hasCodeObjectV3(getGlobalSTI()))
HSAMetadataStream.reset(new MetadataStreamerV3());
else
HSAMetadataStream.reset(new MetadataStreamerV2());
}
StringRef AMDGPUAsmPrinter::getPassName() const {
return "AMDGPU Assembly Printer";
}
const MCSubtargetInfo *AMDGPUAsmPrinter::getGlobalSTI() const {
return TM.getMCSubtargetInfo();
}
AMDGPUTargetStreamer* AMDGPUAsmPrinter::getTargetStreamer() const {
if (!OutStreamer)
return nullptr;
return static_cast<AMDGPUTargetStreamer*>(OutStreamer->getTargetStreamer());
}
void AMDGPUAsmPrinter::emitStartOfAsmFile(Module &M) {
if (IsaInfo::hasCodeObjectV3(getGlobalSTI())) {
std::string ExpectedTarget;
raw_string_ostream ExpectedTargetOS(ExpectedTarget);
IsaInfo::streamIsaVersion(getGlobalSTI(), ExpectedTargetOS);
getTargetStreamer()->EmitDirectiveAMDGCNTarget(ExpectedTarget);
}
if (TM.getTargetTriple().getOS() != Triple::AMDHSA &&
TM.getTargetTriple().getOS() != Triple::AMDPAL)
return;
if (TM.getTargetTriple().getOS() == Triple::AMDHSA)
HSAMetadataStream->begin(M);
if (TM.getTargetTriple().getOS() == Triple::AMDPAL)
getTargetStreamer()->getPALMetadata()->readFromIR(M);
if (IsaInfo::hasCodeObjectV3(getGlobalSTI()))
return;
// HSA emits NT_AMDGPU_HSA_CODE_OBJECT_VERSION for code objects v2.
if (TM.getTargetTriple().getOS() == Triple::AMDHSA)
getTargetStreamer()->EmitDirectiveHSACodeObjectVersion(2, 1);
// HSA and PAL emit NT_AMDGPU_HSA_ISA for code objects v2.
IsaVersion Version = getIsaVersion(getGlobalSTI()->getCPU());
getTargetStreamer()->EmitDirectiveHSACodeObjectISA(
Version.Major, Version.Minor, Version.Stepping, "AMD", "AMDGPU");
}
void AMDGPUAsmPrinter::emitEndOfAsmFile(Module &M) {
// Following code requires TargetStreamer to be present.
if (!getTargetStreamer())
return;
if (!IsaInfo::hasCodeObjectV3(getGlobalSTI())) {
// Emit ISA Version (NT_AMD_AMDGPU_ISA).
std::string ISAVersionString;
raw_string_ostream ISAVersionStream(ISAVersionString);
IsaInfo::streamIsaVersion(getGlobalSTI(), ISAVersionStream);
getTargetStreamer()->EmitISAVersion(ISAVersionStream.str());
}
// Emit HSA Metadata (NT_AMD_AMDGPU_HSA_METADATA).
if (TM.getTargetTriple().getOS() == Triple::AMDHSA) {
HSAMetadataStream->end();
bool Success = HSAMetadataStream->emitTo(*getTargetStreamer());
(void)Success;
assert(Success && "Malformed HSA Metadata");
}
}
bool AMDGPUAsmPrinter::isBlockOnlyReachableByFallthrough(
const MachineBasicBlock *MBB) const {
if (!AsmPrinter::isBlockOnlyReachableByFallthrough(MBB))
return false;
if (MBB->empty())
return true;
// If this is a block implementing a long branch, an expression relative to
// the start of the block is needed. to the start of the block.
// XXX - Is there a smarter way to check this?
return (MBB->back().getOpcode() != AMDGPU::S_SETPC_B64);
}
void AMDGPUAsmPrinter::emitFunctionBodyStart() {
const SIMachineFunctionInfo &MFI = *MF->getInfo<SIMachineFunctionInfo>();
if (!MFI.isEntryFunction())
return;
const GCNSubtarget &STM = MF->getSubtarget<GCNSubtarget>();
const Function &F = MF->getFunction();
if (!STM.hasCodeObjectV3() && STM.isAmdHsaOrMesa(F) &&
(F.getCallingConv() == CallingConv::AMDGPU_KERNEL ||
F.getCallingConv() == CallingConv::SPIR_KERNEL)) {
amd_kernel_code_t KernelCode;
getAmdKernelCode(KernelCode, CurrentProgramInfo, *MF);
getTargetStreamer()->EmitAMDKernelCodeT(KernelCode);
}
if (STM.isAmdHsaOS())
HSAMetadataStream->emitKernel(*MF, CurrentProgramInfo);
}
void AMDGPUAsmPrinter::emitFunctionBodyEnd() {
const SIMachineFunctionInfo &MFI = *MF->getInfo<SIMachineFunctionInfo>();
if (!MFI.isEntryFunction())
return;
if (!IsaInfo::hasCodeObjectV3(getGlobalSTI()) ||
TM.getTargetTriple().getOS() != Triple::AMDHSA)
return;
auto &Streamer = getTargetStreamer()->getStreamer();
auto &Context = Streamer.getContext();
auto &ObjectFileInfo = *Context.getObjectFileInfo();
auto &ReadOnlySection = *ObjectFileInfo.getReadOnlySection();
Streamer.PushSection();
Streamer.SwitchSection(&ReadOnlySection);
// CP microcode requires the kernel descriptor to be allocated on 64 byte
// alignment.
Streamer.emitValueToAlignment(64, 0, 1, 0);
if (ReadOnlySection.getAlignment() < 64)
ReadOnlySection.setAlignment(Align(64));
const MCSubtargetInfo &STI = MF->getSubtarget();
SmallString<128> KernelName;
getNameWithPrefix(KernelName, &MF->getFunction());
getTargetStreamer()->EmitAmdhsaKernelDescriptor(
STI, KernelName, getAmdhsaKernelDescriptor(*MF, CurrentProgramInfo),
CurrentProgramInfo.NumVGPRsForWavesPerEU,
CurrentProgramInfo.NumSGPRsForWavesPerEU -
IsaInfo::getNumExtraSGPRs(&STI,
CurrentProgramInfo.VCCUsed,
CurrentProgramInfo.FlatUsed),
CurrentProgramInfo.VCCUsed, CurrentProgramInfo.FlatUsed,
hasXNACK(STI));
Streamer.PopSection();
}
void AMDGPUAsmPrinter::emitFunctionEntryLabel() {
if (IsaInfo::hasCodeObjectV3(getGlobalSTI()) &&
TM.getTargetTriple().getOS() == Triple::AMDHSA) {
AsmPrinter::emitFunctionEntryLabel();
return;
}
const SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
const GCNSubtarget &STM = MF->getSubtarget<GCNSubtarget>();
if (MFI->isEntryFunction() && STM.isAmdHsaOrMesa(MF->getFunction())) {
SmallString<128> SymbolName;
getNameWithPrefix(SymbolName, &MF->getFunction()),
getTargetStreamer()->EmitAMDGPUSymbolType(
SymbolName, ELF::STT_AMDGPU_HSA_KERNEL);
}
if (DumpCodeInstEmitter) {
// Disassemble function name label to text.
DisasmLines.push_back(MF->getName().str() + ":");
DisasmLineMaxLen = std::max(DisasmLineMaxLen, DisasmLines.back().size());
HexLines.push_back("");
}
AsmPrinter::emitFunctionEntryLabel();
}
void AMDGPUAsmPrinter::emitBasicBlockStart(const MachineBasicBlock &MBB) {
if (DumpCodeInstEmitter && !isBlockOnlyReachableByFallthrough(&MBB)) {
// Write a line for the basic block label if it is not only fallthrough.
DisasmLines.push_back(
(Twine("BB") + Twine(getFunctionNumber())
+ "_" + Twine(MBB.getNumber()) + ":").str());
DisasmLineMaxLen = std::max(DisasmLineMaxLen, DisasmLines.back().size());
HexLines.push_back("");
}
AsmPrinter::emitBasicBlockStart(MBB);
}
void AMDGPUAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
if (GV->getAddressSpace() == AMDGPUAS::LOCAL_ADDRESS) {
if (GV->hasInitializer() && !isa<UndefValue>(GV->getInitializer())) {
OutContext.reportError({},
Twine(GV->getName()) +
": unsupported initializer for address space");
return;
}
// LDS variables aren't emitted in HSA or PAL yet.
const Triple::OSType OS = TM.getTargetTriple().getOS();
if (OS == Triple::AMDHSA || OS == Triple::AMDPAL)
return;
MCSymbol *GVSym = getSymbol(GV);
GVSym->redefineIfPossible();
if (GVSym->isDefined() || GVSym->isVariable())
report_fatal_error("symbol '" + Twine(GVSym->getName()) +
"' is already defined");
const DataLayout &DL = GV->getParent()->getDataLayout();
uint64_t Size = DL.getTypeAllocSize(GV->getValueType());
unsigned Align = GV->getAlignment();
if (!Align)
Align = 4;
emitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration());
emitLinkage(GV, GVSym);
if (auto TS = getTargetStreamer())
TS->emitAMDGPULDS(GVSym, Size, Align);
return;
}
AsmPrinter::emitGlobalVariable(GV);
}
bool AMDGPUAsmPrinter::doFinalization(Module &M) {
CallGraphResourceInfo.clear();
// Pad with s_code_end to help tools and guard against instruction prefetch
// causing stale data in caches. Arguably this should be done by the linker,
// which is why this isn't done for Mesa.
const MCSubtargetInfo &STI = *getGlobalSTI();
if (AMDGPU::isGFX10(STI) &&
(STI.getTargetTriple().getOS() == Triple::AMDHSA ||
STI.getTargetTriple().getOS() == Triple::AMDPAL)) {
OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
getTargetStreamer()->EmitCodeEnd();
}
return AsmPrinter::doFinalization(M);
}
// Print comments that apply to both callable functions and entry points.
void AMDGPUAsmPrinter::emitCommonFunctionComments(
uint32_t NumVGPR,
Optional<uint32_t> NumAGPR,
uint32_t TotalNumVGPR,
uint32_t NumSGPR,
uint64_t ScratchSize,
uint64_t CodeSize,
const AMDGPUMachineFunction *MFI) {
OutStreamer->emitRawComment(" codeLenInByte = " + Twine(CodeSize), false);
OutStreamer->emitRawComment(" NumSgprs: " + Twine(NumSGPR), false);
OutStreamer->emitRawComment(" NumVgprs: " + Twine(NumVGPR), false);
if (NumAGPR) {
OutStreamer->emitRawComment(" NumAgprs: " + Twine(*NumAGPR), false);
OutStreamer->emitRawComment(" TotalNumVgprs: " + Twine(TotalNumVGPR),
false);
}
OutStreamer->emitRawComment(" ScratchSize: " + Twine(ScratchSize), false);
OutStreamer->emitRawComment(" MemoryBound: " + Twine(MFI->isMemoryBound()),
false);
}
uint16_t AMDGPUAsmPrinter::getAmdhsaKernelCodeProperties(
const MachineFunction &MF) const {
const SIMachineFunctionInfo &MFI = *MF.getInfo<SIMachineFunctionInfo>();
uint16_t KernelCodeProperties = 0;
if (MFI.hasPrivateSegmentBuffer()) {
KernelCodeProperties |=
amdhsa::KERNEL_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_BUFFER;
}
if (MFI.hasDispatchPtr()) {
KernelCodeProperties |=
amdhsa::KERNEL_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_PTR;
}
if (MFI.hasQueuePtr()) {
KernelCodeProperties |=
amdhsa::KERNEL_CODE_PROPERTY_ENABLE_SGPR_QUEUE_PTR;
}
if (MFI.hasKernargSegmentPtr()) {
KernelCodeProperties |=
amdhsa::KERNEL_CODE_PROPERTY_ENABLE_SGPR_KERNARG_SEGMENT_PTR;
}
if (MFI.hasDispatchID()) {
KernelCodeProperties |=
amdhsa::KERNEL_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_ID;
}
if (MFI.hasFlatScratchInit()) {
KernelCodeProperties |=
amdhsa::KERNEL_CODE_PROPERTY_ENABLE_SGPR_FLAT_SCRATCH_INIT;
}
if (MF.getSubtarget<GCNSubtarget>().isWave32()) {
KernelCodeProperties |=
amdhsa::KERNEL_CODE_PROPERTY_ENABLE_WAVEFRONT_SIZE32;
}
return KernelCodeProperties;
}
amdhsa::kernel_descriptor_t AMDGPUAsmPrinter::getAmdhsaKernelDescriptor(
const MachineFunction &MF,
const SIProgramInfo &PI) const {
amdhsa::kernel_descriptor_t KernelDescriptor;
memset(&KernelDescriptor, 0x0, sizeof(KernelDescriptor));
assert(isUInt<32>(PI.ScratchSize));
assert(isUInt<32>(PI.ComputePGMRSrc1));
assert(isUInt<32>(PI.ComputePGMRSrc2));
KernelDescriptor.group_segment_fixed_size = PI.LDSSize;
KernelDescriptor.private_segment_fixed_size = PI.ScratchSize;
KernelDescriptor.compute_pgm_rsrc1 = PI.ComputePGMRSrc1;
KernelDescriptor.compute_pgm_rsrc2 = PI.ComputePGMRSrc2;
KernelDescriptor.kernel_code_properties = getAmdhsaKernelCodeProperties(MF);
return KernelDescriptor;
}
bool AMDGPUAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
CurrentProgramInfo = SIProgramInfo();
const AMDGPUMachineFunction *MFI = MF.getInfo<AMDGPUMachineFunction>();
// The starting address of all shader programs must be 256 bytes aligned.
// Regular functions just need the basic required instruction alignment.
MF.setAlignment(MFI->isEntryFunction() ? Align(256) : Align(4));
SetupMachineFunction(MF);
const GCNSubtarget &STM = MF.getSubtarget<GCNSubtarget>();
MCContext &Context = getObjFileLowering().getContext();
// FIXME: This should be an explicit check for Mesa.
if (!STM.isAmdHsaOS() && !STM.isAmdPalOS()) {
MCSectionELF *ConfigSection =
Context.getELFSection(".AMDGPU.config", ELF::SHT_PROGBITS, 0);
OutStreamer->SwitchSection(ConfigSection);
}
if (MFI->isEntryFunction()) {
getSIProgramInfo(CurrentProgramInfo, MF);
} else {
auto I = CallGraphResourceInfo.insert(
std::make_pair(&MF.getFunction(), SIFunctionResourceInfo()));
SIFunctionResourceInfo &Info = I.first->second;
assert(I.second && "should only be called once per function");
Info = analyzeResourceUsage(MF);
}
if (STM.isAmdPalOS())
EmitPALMetadata(MF, CurrentProgramInfo);
else if (!STM.isAmdHsaOS()) {
EmitProgramInfoSI(MF, CurrentProgramInfo);
}
DumpCodeInstEmitter = nullptr;
if (STM.dumpCode()) {
// For -dumpcode, get the assembler out of the streamer, even if it does
// not really want to let us have it. This only works with -filetype=obj.
bool SaveFlag = OutStreamer->getUseAssemblerInfoForParsing();
OutStreamer->setUseAssemblerInfoForParsing(true);
MCAssembler *Assembler = OutStreamer->getAssemblerPtr();
OutStreamer->setUseAssemblerInfoForParsing(SaveFlag);
if (Assembler)
DumpCodeInstEmitter = Assembler->getEmitterPtr();
}
DisasmLines.clear();
HexLines.clear();
DisasmLineMaxLen = 0;
emitFunctionBody();
if (isVerbose()) {
MCSectionELF *CommentSection =
Context.getELFSection(".AMDGPU.csdata", ELF::SHT_PROGBITS, 0);
OutStreamer->SwitchSection(CommentSection);
if (!MFI->isEntryFunction()) {
OutStreamer->emitRawComment(" Function info:", false);
SIFunctionResourceInfo &Info = CallGraphResourceInfo[&MF.getFunction()];
emitCommonFunctionComments(
Info.NumVGPR,
STM.hasMAIInsts() ? Info.NumAGPR : Optional<uint32_t>(),
Info.getTotalNumVGPRs(STM),
Info.getTotalNumSGPRs(MF.getSubtarget<GCNSubtarget>()),
Info.PrivateSegmentSize,
getFunctionCodeSize(MF), MFI);
return false;
}
OutStreamer->emitRawComment(" Kernel info:", false);
emitCommonFunctionComments(CurrentProgramInfo.NumArchVGPR,
STM.hasMAIInsts()
? CurrentProgramInfo.NumAccVGPR
: Optional<uint32_t>(),
CurrentProgramInfo.NumVGPR,
CurrentProgramInfo.NumSGPR,
CurrentProgramInfo.ScratchSize,
getFunctionCodeSize(MF), MFI);
OutStreamer->emitRawComment(
" FloatMode: " + Twine(CurrentProgramInfo.FloatMode), false);
OutStreamer->emitRawComment(
" IeeeMode: " + Twine(CurrentProgramInfo.IEEEMode), false);
OutStreamer->emitRawComment(
" LDSByteSize: " + Twine(CurrentProgramInfo.LDSSize) +
" bytes/workgroup (compile time only)", false);
OutStreamer->emitRawComment(
" SGPRBlocks: " + Twine(CurrentProgramInfo.SGPRBlocks), false);
OutStreamer->emitRawComment(
" VGPRBlocks: " + Twine(CurrentProgramInfo.VGPRBlocks), false);
OutStreamer->emitRawComment(
" NumSGPRsForWavesPerEU: " +
Twine(CurrentProgramInfo.NumSGPRsForWavesPerEU), false);
OutStreamer->emitRawComment(
" NumVGPRsForWavesPerEU: " +
Twine(CurrentProgramInfo.NumVGPRsForWavesPerEU), false);
OutStreamer->emitRawComment(
" Occupancy: " +
Twine(CurrentProgramInfo.Occupancy), false);
OutStreamer->emitRawComment(
" WaveLimiterHint : " + Twine(MFI->needsWaveLimiter()), false);
OutStreamer->emitRawComment(
" COMPUTE_PGM_RSRC2:USER_SGPR: " +
Twine(G_00B84C_USER_SGPR(CurrentProgramInfo.ComputePGMRSrc2)), false);
OutStreamer->emitRawComment(
" COMPUTE_PGM_RSRC2:TRAP_HANDLER: " +
Twine(G_00B84C_TRAP_HANDLER(CurrentProgramInfo.ComputePGMRSrc2)), false);
OutStreamer->emitRawComment(
" COMPUTE_PGM_RSRC2:TGID_X_EN: " +
Twine(G_00B84C_TGID_X_EN(CurrentProgramInfo.ComputePGMRSrc2)), false);
OutStreamer->emitRawComment(
" COMPUTE_PGM_RSRC2:TGID_Y_EN: " +
Twine(G_00B84C_TGID_Y_EN(CurrentProgramInfo.ComputePGMRSrc2)), false);
OutStreamer->emitRawComment(
" COMPUTE_PGM_RSRC2:TGID_Z_EN: " +
Twine(G_00B84C_TGID_Z_EN(CurrentProgramInfo.ComputePGMRSrc2)), false);
OutStreamer->emitRawComment(
" COMPUTE_PGM_RSRC2:TIDIG_COMP_CNT: " +
Twine(G_00B84C_TIDIG_COMP_CNT(CurrentProgramInfo.ComputePGMRSrc2)),
false);
}
if (DumpCodeInstEmitter) {
OutStreamer->SwitchSection(
Context.getELFSection(".AMDGPU.disasm", ELF::SHT_PROGBITS, 0));
for (size_t i = 0; i < DisasmLines.size(); ++i) {
std::string Comment = "\n";
if (!HexLines[i].empty()) {
Comment = std::string(DisasmLineMaxLen - DisasmLines[i].size(), ' ');
Comment += " ; " + HexLines[i] + "\n";
}
OutStreamer->emitBytes(StringRef(DisasmLines[i]));
OutStreamer->emitBytes(StringRef(Comment));
}
}
return false;
}
uint64_t AMDGPUAsmPrinter::getFunctionCodeSize(const MachineFunction &MF) const {
const GCNSubtarget &STM = MF.getSubtarget<GCNSubtarget>();
const SIInstrInfo *TII = STM.getInstrInfo();
uint64_t CodeSize = 0;
for (const MachineBasicBlock &MBB : MF) {
for (const MachineInstr &MI : MBB) {
// TODO: CodeSize should account for multiple functions.
// TODO: Should we count size of debug info?
if (MI.isDebugInstr())
continue;
CodeSize += TII->getInstSizeInBytes(MI);
}
}
return CodeSize;
}
static bool hasAnyNonFlatUseOfReg(const MachineRegisterInfo &MRI,
const SIInstrInfo &TII,
unsigned Reg) {
for (const MachineOperand &UseOp : MRI.reg_operands(Reg)) {
if (!UseOp.isImplicit() || !TII.isFLAT(*UseOp.getParent()))
return true;
}
return false;
}
int32_t AMDGPUAsmPrinter::SIFunctionResourceInfo::getTotalNumSGPRs(
const GCNSubtarget &ST) const {
return NumExplicitSGPR + IsaInfo::getNumExtraSGPRs(&ST,
UsesVCC, UsesFlatScratch);
}
int32_t AMDGPUAsmPrinter::SIFunctionResourceInfo::getTotalNumVGPRs(
const GCNSubtarget &ST) const {
return std::max(NumVGPR, NumAGPR);
}
static const Function *getCalleeFunction(const MachineOperand &Op) {
if (Op.isImm()) {
assert(Op.getImm() == 0);
return nullptr;
}
return cast<Function>(Op.getGlobal());
}
AMDGPUAsmPrinter::SIFunctionResourceInfo AMDGPUAsmPrinter::analyzeResourceUsage(
const MachineFunction &MF) const {
SIFunctionResourceInfo Info;
const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
const MachineRegisterInfo &MRI = MF.getRegInfo();
const SIInstrInfo *TII = ST.getInstrInfo();
const SIRegisterInfo &TRI = TII->getRegisterInfo();
Info.UsesFlatScratch = MRI.isPhysRegUsed(AMDGPU::FLAT_SCR_LO) ||
MRI.isPhysRegUsed(AMDGPU::FLAT_SCR_HI);
// Even if FLAT_SCRATCH is implicitly used, it has no effect if flat
// instructions aren't used to access the scratch buffer. Inline assembly may
// need it though.
//
// If we only have implicit uses of flat_scr on flat instructions, it is not
// really needed.
if (Info.UsesFlatScratch && !MFI->hasFlatScratchInit() &&
(!hasAnyNonFlatUseOfReg(MRI, *TII, AMDGPU::FLAT_SCR) &&
!hasAnyNonFlatUseOfReg(MRI, *TII, AMDGPU::FLAT_SCR_LO) &&
!hasAnyNonFlatUseOfReg(MRI, *TII, AMDGPU::FLAT_SCR_HI))) {
Info.UsesFlatScratch = false;
}
Info.HasDynamicallySizedStack = FrameInfo.hasVarSizedObjects();
Info.PrivateSegmentSize = FrameInfo.getStackSize();
if (MFI->isStackRealigned())
Info.PrivateSegmentSize += FrameInfo.getMaxAlign().value();
Info.UsesVCC = MRI.isPhysRegUsed(AMDGPU::VCC_LO) ||
MRI.isPhysRegUsed(AMDGPU::VCC_HI);
// If there are no calls, MachineRegisterInfo can tell us the used register
// count easily.
// A tail call isn't considered a call for MachineFrameInfo's purposes.
if (!FrameInfo.hasCalls() && !FrameInfo.hasTailCall()) {
MCPhysReg HighestVGPRReg = AMDGPU::NoRegister;
for (MCPhysReg Reg : reverse(AMDGPU::VGPR_32RegClass.getRegisters())) {
if (MRI.isPhysRegUsed(Reg)) {
HighestVGPRReg = Reg;
break;
}
}
if (ST.hasMAIInsts()) {
MCPhysReg HighestAGPRReg = AMDGPU::NoRegister;
for (MCPhysReg Reg : reverse(AMDGPU::AGPR_32RegClass.getRegisters())) {
if (MRI.isPhysRegUsed(Reg)) {
HighestAGPRReg = Reg;
break;
}
}
Info.NumAGPR = HighestAGPRReg == AMDGPU::NoRegister ? 0 :
TRI.getHWRegIndex(HighestAGPRReg) + 1;
}
MCPhysReg HighestSGPRReg = AMDGPU::NoRegister;
for (MCPhysReg Reg : reverse(AMDGPU::SGPR_32RegClass.getRegisters())) {
if (MRI.isPhysRegUsed(Reg)) {
HighestSGPRReg = Reg;
break;
}
}
// We found the maximum register index. They start at 0, so add one to get the
// number of registers.
Info.NumVGPR = HighestVGPRReg == AMDGPU::NoRegister ? 0 :
TRI.getHWRegIndex(HighestVGPRReg) + 1;
Info.NumExplicitSGPR = HighestSGPRReg == AMDGPU::NoRegister ? 0 :
TRI.getHWRegIndex(HighestSGPRReg) + 1;
return Info;
}
int32_t MaxVGPR = -1;
int32_t MaxAGPR = -1;
int32_t MaxSGPR = -1;
uint64_t CalleeFrameSize = 0;
for (const MachineBasicBlock &MBB : MF) {
for (const MachineInstr &MI : MBB) {
// TODO: Check regmasks? Do they occur anywhere except calls?
for (const MachineOperand &MO : MI.operands()) {
unsigned Width = 0;
bool IsSGPR = false;
bool IsAGPR = false;
if (!MO.isReg())
continue;
Register Reg = MO.getReg();
switch (Reg) {
case AMDGPU::EXEC:
case AMDGPU::EXEC_LO:
case AMDGPU::EXEC_HI:
case AMDGPU::SCC:
case AMDGPU::M0:
case AMDGPU::SRC_SHARED_BASE:
case AMDGPU::SRC_SHARED_LIMIT:
case AMDGPU::SRC_PRIVATE_BASE:
case AMDGPU::SRC_PRIVATE_LIMIT:
case AMDGPU::SGPR_NULL:
continue;
case AMDGPU::SRC_POPS_EXITING_WAVE_ID:
llvm_unreachable("src_pops_exiting_wave_id should not be used");
case AMDGPU::NoRegister:
assert(MI.isDebugInstr());
continue;
case AMDGPU::VCC:
case AMDGPU::VCC_LO:
case AMDGPU::VCC_HI:
Info.UsesVCC = true;
continue;
case AMDGPU::FLAT_SCR:
case AMDGPU::FLAT_SCR_LO:
case AMDGPU::FLAT_SCR_HI:
continue;
case AMDGPU::XNACK_MASK:
case AMDGPU::XNACK_MASK_LO:
case AMDGPU::XNACK_MASK_HI:
llvm_unreachable("xnack_mask registers should not be used");
case AMDGPU::LDS_DIRECT:
llvm_unreachable("lds_direct register should not be used");
case AMDGPU::TBA:
case AMDGPU::TBA_LO:
case AMDGPU::TBA_HI:
case AMDGPU::TMA:
case AMDGPU::TMA_LO:
case AMDGPU::TMA_HI:
llvm_unreachable("trap handler registers should not be used");
case AMDGPU::SRC_VCCZ:
llvm_unreachable("src_vccz register should not be used");
case AMDGPU::SRC_EXECZ:
llvm_unreachable("src_execz register should not be used");
case AMDGPU::SRC_SCC:
llvm_unreachable("src_scc register should not be used");
default:
break;
}
if (AMDGPU::SReg_32RegClass.contains(Reg) ||
AMDGPU::SGPR_LO16RegClass.contains(Reg) ||
AMDGPU::SGPR_HI16RegClass.contains(Reg)) {
assert(!AMDGPU::TTMP_32RegClass.contains(Reg) &&
"trap handler registers should not be used");
IsSGPR = true;
Width = 1;
} else if (AMDGPU::VGPR_32RegClass.contains(Reg) ||
AMDGPU::VGPR_LO16RegClass.contains(Reg) ||
AMDGPU::VGPR_HI16RegClass.contains(Reg)) {
IsSGPR = false;
Width = 1;
} else if (AMDGPU::AGPR_32RegClass.contains(Reg)) {
IsSGPR = false;
IsAGPR = true;
Width = 1;
} else if (AMDGPU::SReg_64RegClass.contains(Reg)) {
assert(!AMDGPU::TTMP_64RegClass.contains(Reg) &&
"trap handler registers should not be used");
IsSGPR = true;
Width = 2;
} else if (AMDGPU::VReg_64RegClass.contains(Reg)) {
IsSGPR = false;
Width = 2;
} else if (AMDGPU::AReg_64RegClass.contains(Reg)) {
IsSGPR = false;
IsAGPR = true;
Width = 2;
} else if (AMDGPU::VReg_96RegClass.contains(Reg)) {
IsSGPR = false;
Width = 3;
} else if (AMDGPU::SReg_96RegClass.contains(Reg)) {
IsSGPR = true;
Width = 3;
} else if (AMDGPU::AReg_96RegClass.contains(Reg)) {
IsSGPR = false;
IsAGPR = true;
Width = 3;
} else if (AMDGPU::SReg_128RegClass.contains(Reg)) {
assert(!AMDGPU::TTMP_128RegClass.contains(Reg) &&
"trap handler registers should not be used");
IsSGPR = true;
Width = 4;
} else if (AMDGPU::VReg_128RegClass.contains(Reg)) {
IsSGPR = false;
Width = 4;
} else if (AMDGPU::AReg_128RegClass.contains(Reg)) {
IsSGPR = false;
IsAGPR = true;
Width = 4;
} else if (AMDGPU::VReg_160RegClass.contains(Reg)) {
IsSGPR = false;
Width = 5;
} else if (AMDGPU::SReg_160RegClass.contains(Reg)) {
IsSGPR = true;
Width = 5;
} else if (AMDGPU::AReg_160RegClass.contains(Reg)) {
IsSGPR = false;
IsAGPR = true;
Width = 5;
} else if (AMDGPU::SReg_256RegClass.contains(Reg)) {
assert(!AMDGPU::TTMP_256RegClass.contains(Reg) &&
"trap handler registers should not be used");
IsSGPR = true;
Width = 8;
} else if (AMDGPU::VReg_256RegClass.contains(Reg)) {
IsSGPR = false;
Width = 8;
} else if (AMDGPU::AReg_256RegClass.contains(Reg)) {
IsSGPR = false;
IsAGPR = true;
Width = 8;
} else if (AMDGPU::SReg_512RegClass.contains(Reg)) {
assert(!AMDGPU::TTMP_512RegClass.contains(Reg) &&
"trap handler registers should not be used");
IsSGPR = true;
Width = 16;
} else if (AMDGPU::VReg_512RegClass.contains(Reg)) {
IsSGPR = false;
Width = 16;
} else if (AMDGPU::AReg_512RegClass.contains(Reg)) {
IsSGPR = false;
IsAGPR = true;
Width = 16;
} else if (AMDGPU::SReg_1024RegClass.contains(Reg)) {
IsSGPR = true;
Width = 32;
} else if (AMDGPU::VReg_1024RegClass.contains(Reg)) {
IsSGPR = false;
Width = 32;
} else if (AMDGPU::AReg_1024RegClass.contains(Reg)) {
IsSGPR = false;
IsAGPR = true;
Width = 32;
} else {
llvm_unreachable("Unknown register class");
}
unsigned HWReg = TRI.getHWRegIndex(Reg);
int MaxUsed = HWReg + Width - 1;
if (IsSGPR) {
MaxSGPR = MaxUsed > MaxSGPR ? MaxUsed : MaxSGPR;
} else if (IsAGPR) {
MaxAGPR = MaxUsed > MaxAGPR ? MaxUsed : MaxAGPR;
} else {
MaxVGPR = MaxUsed > MaxVGPR ? MaxUsed : MaxVGPR;
}
}
if (MI.isCall()) {
// Pseudo used just to encode the underlying global. Is there a better
// way to track this?
const MachineOperand *CalleeOp
= TII->getNamedOperand(MI, AMDGPU::OpName::callee);
const Function *Callee = getCalleeFunction(*CalleeOp);
if (!Callee || Callee->isDeclaration()) {
// If this is a call to an external function, we can't do much. Make
// conservative guesses.
// 48 SGPRs - vcc, - flat_scr, -xnack
int MaxSGPRGuess =
47 - IsaInfo::getNumExtraSGPRs(&ST, true, ST.hasFlatAddressSpace());
MaxSGPR = std::max(MaxSGPR, MaxSGPRGuess);
MaxVGPR = std::max(MaxVGPR, 23);
MaxAGPR = std::max(MaxAGPR, 23);
CalleeFrameSize = std::max(CalleeFrameSize, UINT64_C(16384));
Info.UsesVCC = true;
Info.UsesFlatScratch = ST.hasFlatAddressSpace();
Info.HasDynamicallySizedStack = true;
} else {
// We force CodeGen to run in SCC order, so the callee's register
// usage etc. should be the cumulative usage of all callees.
auto I = CallGraphResourceInfo.find(Callee);
if (I == CallGraphResourceInfo.end()) {
// Avoid crashing on undefined behavior with an illegal call to a
// kernel. If a callsite's calling convention doesn't match the
// function's, it's undefined behavior. If the callsite calling
// convention does match, that would have errored earlier.
// FIXME: The verifier shouldn't allow this.
if (AMDGPU::isEntryFunctionCC(Callee->getCallingConv()))
report_fatal_error("invalid call to entry function");
llvm_unreachable("callee should have been handled before caller");
}
MaxSGPR = std::max(I->second.NumExplicitSGPR - 1, MaxSGPR);
MaxVGPR = std::max(I->second.NumVGPR - 1, MaxVGPR);
MaxAGPR = std::max(I->second.NumAGPR - 1, MaxAGPR);
CalleeFrameSize
= std::max(I->second.PrivateSegmentSize, CalleeFrameSize);
Info.UsesVCC |= I->second.UsesVCC;
Info.UsesFlatScratch |= I->second.UsesFlatScratch;
Info.HasDynamicallySizedStack |= I->second.HasDynamicallySizedStack;
Info.HasRecursion |= I->second.HasRecursion;
}
// FIXME: Call site could have norecurse on it
if (!Callee || !Callee->doesNotRecurse())
Info.HasRecursion = true;
}
}
}
Info.NumExplicitSGPR = MaxSGPR + 1;
Info.NumVGPR = MaxVGPR + 1;
Info.NumAGPR = MaxAGPR + 1;
Info.PrivateSegmentSize += CalleeFrameSize;
return Info;
}
void AMDGPUAsmPrinter::getSIProgramInfo(SIProgramInfo &ProgInfo,
const MachineFunction &MF) {
SIFunctionResourceInfo Info = analyzeResourceUsage(MF);
const GCNSubtarget &STM = MF.getSubtarget<GCNSubtarget>();
ProgInfo.NumArchVGPR = Info.NumVGPR;
ProgInfo.NumAccVGPR = Info.NumAGPR;
ProgInfo.NumVGPR = Info.getTotalNumVGPRs(STM);
ProgInfo.NumSGPR = Info.NumExplicitSGPR;
ProgInfo.ScratchSize = Info.PrivateSegmentSize;
ProgInfo.VCCUsed = Info.UsesVCC;
ProgInfo.FlatUsed = Info.UsesFlatScratch;
ProgInfo.DynamicCallStack = Info.HasDynamicallySizedStack || Info.HasRecursion;
if (!isUInt<32>(ProgInfo.ScratchSize)) {
DiagnosticInfoStackSize DiagStackSize(MF.getFunction(),
ProgInfo.ScratchSize, DS_Error);
MF.getFunction().getContext().diagnose(DiagStackSize);
}
const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
// TODO(scott.linder): The calculations related to SGPR/VGPR blocks are
// duplicated in part in AMDGPUAsmParser::calculateGPRBlocks, and could be
// unified.
unsigned ExtraSGPRs = IsaInfo::getNumExtraSGPRs(
&STM, ProgInfo.VCCUsed, ProgInfo.FlatUsed);
// Check the addressable register limit before we add ExtraSGPRs.
if (STM.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS &&
!STM.hasSGPRInitBug()) {
unsigned MaxAddressableNumSGPRs = STM.getAddressableNumSGPRs();
if (ProgInfo.NumSGPR > MaxAddressableNumSGPRs) {
// This can happen due to a compiler bug or when using inline asm.
LLVMContext &Ctx = MF.getFunction().getContext();
DiagnosticInfoResourceLimit Diag(MF.getFunction(),
"addressable scalar registers",
ProgInfo.NumSGPR, DS_Error,
DK_ResourceLimit,
MaxAddressableNumSGPRs);
Ctx.diagnose(Diag);
ProgInfo.NumSGPR = MaxAddressableNumSGPRs - 1;
}
}
// Account for extra SGPRs and VGPRs reserved for debugger use.
ProgInfo.NumSGPR += ExtraSGPRs;
// Ensure there are enough SGPRs and VGPRs for wave dispatch, where wave
// dispatch registers are function args.
unsigned WaveDispatchNumSGPR = 0, WaveDispatchNumVGPR = 0;
for (auto &Arg : MF.getFunction().args()) {
unsigned NumRegs = (Arg.getType()->getPrimitiveSizeInBits() + 31) / 32;
if (Arg.hasAttribute(Attribute::InReg))
WaveDispatchNumSGPR += NumRegs;
else
WaveDispatchNumVGPR += NumRegs;
}
ProgInfo.NumSGPR = std::max(ProgInfo.NumSGPR, WaveDispatchNumSGPR);
ProgInfo.NumVGPR = std::max(ProgInfo.NumVGPR, WaveDispatchNumVGPR);