| //===-- AMDGPUAsmPrinter.cpp - AMDGPU Assebly printer --------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| /// \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 "R600Defines.h" |
| #include "R600MachineFunctionInfo.h" |
| #include "R600RegisterInfo.h" |
| #include "SIDefines.h" |
| #include "SIMachineFunctionInfo.h" |
| #include "SIRegisterInfo.h" |
| #include "llvm/CodeGen/MachineFrameInfo.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCSectionELF.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/Support/ELF.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/TargetRegistry.h" |
| #include "llvm/Target/TargetLoweringObjectFile.h" |
| |
| using namespace llvm; |
| |
| // TODO: 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(const MachineFunction &F) { |
| const AMDGPUSubtarget& ST = F.getTarget().getSubtarget<AMDGPUSubtarget>(); |
| // TODO: Is there any real use for the flush in only / flush out only modes? |
| |
| uint32_t FP32Denormals = |
| ST.hasFP32Denormals() ? FP_DENORM_FLUSH_NONE : FP_DENORM_FLUSH_IN_FLUSH_OUT; |
| |
| uint32_t FP64Denormals = |
| ST.hasFP64Denormals() ? FP_DENORM_FLUSH_NONE : FP_DENORM_FLUSH_IN_FLUSH_OUT; |
| |
| return FP_ROUND_MODE_SP(FP_ROUND_ROUND_TO_NEAREST) | |
| FP_ROUND_MODE_DP(FP_ROUND_ROUND_TO_NEAREST) | |
| FP_DENORM_MODE_SP(FP32Denormals) | |
| FP_DENORM_MODE_DP(FP64Denormals); |
| } |
| |
| static AsmPrinter *createAMDGPUAsmPrinterPass(TargetMachine &tm, |
| MCStreamer &Streamer) { |
| return new AMDGPUAsmPrinter(tm, Streamer); |
| } |
| |
| extern "C" void LLVMInitializeR600AsmPrinter() { |
| TargetRegistry::RegisterAsmPrinter(TheAMDGPUTarget, createAMDGPUAsmPrinterPass); |
| } |
| |
| AMDGPUAsmPrinter::AMDGPUAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) |
| : AsmPrinter(TM, Streamer) { |
| DisasmEnabled = TM.getSubtarget<AMDGPUSubtarget>().dumpCode(); |
| } |
| |
| void AMDGPUAsmPrinter::EmitEndOfAsmFile(Module &M) { |
| |
| // This label is used to mark the end of the .text section. |
| const TargetLoweringObjectFile &TLOF = getObjFileLowering(); |
| OutStreamer.SwitchSection(TLOF.getTextSection()); |
| MCSymbol *EndOfTextLabel = |
| OutContext.GetOrCreateSymbol(StringRef(END_OF_TEXT_LABEL_NAME)); |
| OutStreamer.EmitLabel(EndOfTextLabel); |
| } |
| |
| bool AMDGPUAsmPrinter::runOnMachineFunction(MachineFunction &MF) { |
| SetupMachineFunction(MF); |
| |
| OutStreamer.emitRawComment(Twine('@') + MF.getName() + Twine(':')); |
| |
| MCContext &Context = getObjFileLowering().getContext(); |
| const MCSectionELF *ConfigSection = Context.getELFSection(".AMDGPU.config", |
| ELF::SHT_PROGBITS, 0, |
| SectionKind::getReadOnly()); |
| OutStreamer.SwitchSection(ConfigSection); |
| |
| const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>(); |
| SIProgramInfo KernelInfo; |
| if (STM.getGeneration() > AMDGPUSubtarget::NORTHERN_ISLANDS) { |
| getSIProgramInfo(KernelInfo, MF); |
| EmitProgramInfoSI(MF, KernelInfo); |
| } else { |
| EmitProgramInfoR600(MF); |
| } |
| |
| DisasmLines.clear(); |
| HexLines.clear(); |
| DisasmLineMaxLen = 0; |
| |
| OutStreamer.SwitchSection(getObjFileLowering().getTextSection()); |
| EmitFunctionBody(); |
| |
| if (isVerbose()) { |
| const MCSectionELF *CommentSection |
| = Context.getELFSection(".AMDGPU.csdata", |
| ELF::SHT_PROGBITS, 0, |
| SectionKind::getReadOnly()); |
| OutStreamer.SwitchSection(CommentSection); |
| |
| if (STM.getGeneration() >= AMDGPUSubtarget::SOUTHERN_ISLANDS) { |
| OutStreamer.emitRawComment(" Kernel info:", false); |
| OutStreamer.emitRawComment(" codeLenInByte = " + Twine(KernelInfo.CodeLen), |
| false); |
| OutStreamer.emitRawComment(" NumSgprs: " + Twine(KernelInfo.NumSGPR), |
| false); |
| OutStreamer.emitRawComment(" NumVgprs: " + Twine(KernelInfo.NumVGPR), |
| false); |
| OutStreamer.emitRawComment(" FloatMode: " + Twine(KernelInfo.FloatMode), |
| false); |
| OutStreamer.emitRawComment(" IeeeMode: " + Twine(KernelInfo.IEEEMode), |
| false); |
| OutStreamer.emitRawComment(" ScratchSize: " + Twine(KernelInfo.ScratchSize), |
| false); |
| } else { |
| R600MachineFunctionInfo *MFI = MF.getInfo<R600MachineFunctionInfo>(); |
| OutStreamer.emitRawComment( |
| Twine("SQ_PGM_RESOURCES:STACK_SIZE = " + Twine(MFI->StackSize))); |
| } |
| } |
| |
| if (STM.dumpCode()) { |
| #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) |
| MF.dump(); |
| #endif |
| |
| if (DisasmEnabled) { |
| OutStreamer.SwitchSection(Context.getELFSection(".AMDGPU.disasm", |
| ELF::SHT_NOTE, 0, |
| SectionKind::getReadOnly())); |
| |
| for (size_t i = 0; i < DisasmLines.size(); ++i) { |
| std::string Comment(DisasmLineMaxLen - DisasmLines[i].size(), ' '); |
| Comment += " ; " + HexLines[i] + "\n"; |
| |
| OutStreamer.EmitBytes(StringRef(DisasmLines[i])); |
| OutStreamer.EmitBytes(StringRef(Comment)); |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| void AMDGPUAsmPrinter::EmitProgramInfoR600(const MachineFunction &MF) { |
| unsigned MaxGPR = 0; |
| bool killPixel = false; |
| const R600RegisterInfo *RI |
| = static_cast<const R600RegisterInfo*>(TM.getRegisterInfo()); |
| const R600MachineFunctionInfo *MFI = MF.getInfo<R600MachineFunctionInfo>(); |
| const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>(); |
| |
| for (const MachineBasicBlock &MBB : MF) { |
| for (const MachineInstr &MI : MBB) { |
| if (MI.getOpcode() == AMDGPU::KILLGT) |
| killPixel = true; |
| unsigned numOperands = MI.getNumOperands(); |
| for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) { |
| const MachineOperand &MO = MI.getOperand(op_idx); |
| if (!MO.isReg()) |
| continue; |
| unsigned HWReg = RI->getEncodingValue(MO.getReg()) & 0xff; |
| |
| // Register with value > 127 aren't GPR |
| if (HWReg > 127) |
| continue; |
| MaxGPR = std::max(MaxGPR, HWReg); |
| } |
| } |
| } |
| |
| unsigned RsrcReg; |
| if (STM.getGeneration() >= AMDGPUSubtarget::EVERGREEN) { |
| // Evergreen / Northern Islands |
| switch (MFI->getShaderType()) { |
| default: // Fall through |
| case ShaderType::COMPUTE: RsrcReg = R_0288D4_SQ_PGM_RESOURCES_LS; break; |
| case ShaderType::GEOMETRY: RsrcReg = R_028878_SQ_PGM_RESOURCES_GS; break; |
| case ShaderType::PIXEL: RsrcReg = R_028844_SQ_PGM_RESOURCES_PS; break; |
| case ShaderType::VERTEX: RsrcReg = R_028860_SQ_PGM_RESOURCES_VS; break; |
| } |
| } else { |
| // R600 / R700 |
| switch (MFI->getShaderType()) { |
| default: // Fall through |
| case ShaderType::GEOMETRY: // Fall through |
| case ShaderType::COMPUTE: // Fall through |
| case ShaderType::VERTEX: RsrcReg = R_028868_SQ_PGM_RESOURCES_VS; break; |
| case ShaderType::PIXEL: RsrcReg = R_028850_SQ_PGM_RESOURCES_PS; break; |
| } |
| } |
| |
| OutStreamer.EmitIntValue(RsrcReg, 4); |
| OutStreamer.EmitIntValue(S_NUM_GPRS(MaxGPR + 1) | |
| S_STACK_SIZE(MFI->StackSize), 4); |
| OutStreamer.EmitIntValue(R_02880C_DB_SHADER_CONTROL, 4); |
| OutStreamer.EmitIntValue(S_02880C_KILL_ENABLE(killPixel), 4); |
| |
| if (MFI->getShaderType() == ShaderType::COMPUTE) { |
| OutStreamer.EmitIntValue(R_0288E8_SQ_LDS_ALLOC, 4); |
| OutStreamer.EmitIntValue(RoundUpToAlignment(MFI->LDSSize, 4) >> 2, 4); |
| } |
| } |
| |
| void AMDGPUAsmPrinter::getSIProgramInfo(SIProgramInfo &ProgInfo, |
| const MachineFunction &MF) const { |
| uint64_t CodeSize = 0; |
| unsigned MaxSGPR = 0; |
| unsigned MaxVGPR = 0; |
| bool VCCUsed = false; |
| const SIRegisterInfo *RI |
| = static_cast<const SIRegisterInfo*>(TM.getRegisterInfo()); |
| |
| for (const MachineBasicBlock &MBB : MF) { |
| for (const MachineInstr &MI : MBB) { |
| // TODO: CodeSize should account for multiple functions. |
| CodeSize += MI.getDesc().Size; |
| |
| unsigned numOperands = MI.getNumOperands(); |
| for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) { |
| const MachineOperand &MO = MI.getOperand(op_idx); |
| unsigned width = 0; |
| bool isSGPR = false; |
| |
| if (!MO.isReg()) { |
| continue; |
| } |
| unsigned reg = MO.getReg(); |
| if (reg == AMDGPU::VCC || reg == AMDGPU::VCC_LO || |
| reg == AMDGPU::VCC_HI) { |
| VCCUsed = true; |
| continue; |
| } |
| |
| switch (reg) { |
| default: break; |
| case AMDGPU::SCC: |
| case AMDGPU::EXEC: |
| case AMDGPU::M0: |
| continue; |
| } |
| |
| if (AMDGPU::SReg_32RegClass.contains(reg)) { |
| isSGPR = true; |
| width = 1; |
| } else if (AMDGPU::VReg_32RegClass.contains(reg)) { |
| isSGPR = false; |
| width = 1; |
| } else if (AMDGPU::SReg_64RegClass.contains(reg)) { |
| isSGPR = true; |
| width = 2; |
| } else if (AMDGPU::VReg_64RegClass.contains(reg)) { |
| isSGPR = false; |
| width = 2; |
| } else if (AMDGPU::VReg_96RegClass.contains(reg)) { |
| isSGPR = false; |
| width = 3; |
| } else if (AMDGPU::SReg_128RegClass.contains(reg)) { |
| isSGPR = true; |
| width = 4; |
| } else if (AMDGPU::VReg_128RegClass.contains(reg)) { |
| isSGPR = false; |
| width = 4; |
| } else if (AMDGPU::SReg_256RegClass.contains(reg)) { |
| isSGPR = true; |
| width = 8; |
| } else if (AMDGPU::VReg_256RegClass.contains(reg)) { |
| isSGPR = false; |
| width = 8; |
| } else if (AMDGPU::SReg_512RegClass.contains(reg)) { |
| isSGPR = true; |
| width = 16; |
| } else if (AMDGPU::VReg_512RegClass.contains(reg)) { |
| isSGPR = false; |
| width = 16; |
| } else { |
| llvm_unreachable("Unknown register class"); |
| } |
| unsigned hwReg = RI->getEncodingValue(reg) & 0xff; |
| unsigned maxUsed = hwReg + width - 1; |
| if (isSGPR) { |
| MaxSGPR = maxUsed > MaxSGPR ? maxUsed : MaxSGPR; |
| } else { |
| MaxVGPR = maxUsed > MaxVGPR ? maxUsed : MaxVGPR; |
| } |
| } |
| } |
| } |
| |
| if (VCCUsed) |
| MaxSGPR += 2; |
| |
| ProgInfo.NumVGPR = MaxVGPR; |
| ProgInfo.NumSGPR = MaxSGPR; |
| |
| // Set the value to initialize FP_ROUND and FP_DENORM parts of the mode |
| // register. |
| ProgInfo.FloatMode = getFPMode(MF); |
| |
| // XXX: Not quite sure what this does, but sc seems to unset this. |
| ProgInfo.IEEEMode = 0; |
| |
| // Do not clamp NAN to 0. |
| ProgInfo.DX10Clamp = 0; |
| |
| const MachineFrameInfo *FrameInfo = MF.getFrameInfo(); |
| ProgInfo.ScratchSize = FrameInfo->estimateStackSize(MF); |
| |
| ProgInfo.CodeLen = CodeSize; |
| } |
| |
| void AMDGPUAsmPrinter::EmitProgramInfoSI(const MachineFunction &MF, |
| const SIProgramInfo &KernelInfo) { |
| const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>(); |
| const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>(); |
| |
| unsigned RsrcReg; |
| switch (MFI->getShaderType()) { |
| default: // Fall through |
| case ShaderType::COMPUTE: RsrcReg = R_00B848_COMPUTE_PGM_RSRC1; break; |
| case ShaderType::GEOMETRY: RsrcReg = R_00B228_SPI_SHADER_PGM_RSRC1_GS; break; |
| case ShaderType::PIXEL: RsrcReg = R_00B028_SPI_SHADER_PGM_RSRC1_PS; break; |
| case ShaderType::VERTEX: RsrcReg = R_00B128_SPI_SHADER_PGM_RSRC1_VS; break; |
| } |
| |
| unsigned LDSAlignShift; |
| if (STM.getGeneration() < AMDGPUSubtarget::SEA_ISLANDS) { |
| // LDS is allocated in 64 dword blocks. |
| LDSAlignShift = 8; |
| } else { |
| // LDS is allocated in 128 dword blocks. |
| LDSAlignShift = 9; |
| } |
| |
| unsigned LDSBlocks = |
| RoundUpToAlignment(MFI->LDSSize, 1 << LDSAlignShift) >> LDSAlignShift; |
| |
| // Scratch is allocated in 256 dword blocks. |
| unsigned ScratchAlignShift = 10; |
| // We need to program the hardware with the amount of scratch memory that |
| // is used by the entire wave. KernelInfo.ScratchSize is the amount of |
| // scratch memory used per thread. |
| unsigned ScratchBlocks = |
| RoundUpToAlignment(KernelInfo.ScratchSize * STM.getWavefrontSize(), |
| 1 << ScratchAlignShift) >> ScratchAlignShift; |
| |
| if (MFI->getShaderType() == ShaderType::COMPUTE) { |
| OutStreamer.EmitIntValue(R_00B848_COMPUTE_PGM_RSRC1, 4); |
| |
| const uint32_t ComputePGMRSrc1 = |
| S_00B848_VGPRS(KernelInfo.NumVGPR / 4) | |
| S_00B848_SGPRS(KernelInfo.NumSGPR / 8) | |
| S_00B848_PRIORITY(KernelInfo.Priority) | |
| S_00B848_FLOAT_MODE(KernelInfo.FloatMode) | |
| S_00B848_PRIV(KernelInfo.Priv) | |
| S_00B848_DX10_CLAMP(KernelInfo.DX10Clamp) | |
| S_00B848_IEEE_MODE(KernelInfo.DebugMode) | |
| S_00B848_IEEE_MODE(KernelInfo.IEEEMode); |
| |
| OutStreamer.EmitIntValue(ComputePGMRSrc1, 4); |
| |
| OutStreamer.EmitIntValue(R_00B84C_COMPUTE_PGM_RSRC2, 4); |
| const uint32_t ComputePGMRSrc2 = |
| S_00B84C_LDS_SIZE(LDSBlocks) | |
| S_00B02C_SCRATCH_EN(ScratchBlocks > 0); |
| |
| OutStreamer.EmitIntValue(ComputePGMRSrc2, 4); |
| |
| OutStreamer.EmitIntValue(R_00B860_COMPUTE_TMPRING_SIZE, 4); |
| OutStreamer.EmitIntValue(S_00B860_WAVESIZE(ScratchBlocks), 4); |
| } else { |
| OutStreamer.EmitIntValue(RsrcReg, 4); |
| OutStreamer.EmitIntValue(S_00B028_VGPRS(KernelInfo.NumVGPR / 4) | |
| S_00B028_SGPRS(KernelInfo.NumSGPR / 8), 4); |
| } |
| |
| if (MFI->getShaderType() == ShaderType::PIXEL) { |
| OutStreamer.EmitIntValue(R_00B02C_SPI_SHADER_PGM_RSRC2_PS, 4); |
| OutStreamer.EmitIntValue(S_00B02C_EXTRA_LDS_SIZE(LDSBlocks), 4); |
| OutStreamer.EmitIntValue(R_0286CC_SPI_PS_INPUT_ENA, 4); |
| OutStreamer.EmitIntValue(MFI->PSInputAddr, 4); |
| } |
| } |
