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Diffstat (limited to 'contrib/llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp b/contrib/llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp new file mode 100644 index 0000000..73faaa1 --- /dev/null +++ b/contrib/llvm/lib/Target/R600/AMDGPUAsmPrinter.cpp @@ -0,0 +1,415 @@ +//===-- 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); + } +} |
