//===----------------------------------------------------------------------===//
//
-
#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) {
TargetRegistry::RegisterAsmPrinter(TheAMDGPUTarget, createAMDGPUAsmPrinterPass);
}
-/// We need to override this function so we can avoid
-/// the call to EmitFunctionHeader(), which the MCPureStreamer can't handle.
+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));
+ }
+ }
}
- SetupMachineFunction(MF);
- if (OutStreamer.hasRawTextSupport()) {
- OutStreamer.EmitRawText("@" + MF.getName() + ":");
+
+ 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);
+ }
+ }
}
- OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
- if (STM.device()->getGeneration() > AMDGPUDeviceInfo::HD6XXX) {
- EmitProgramInfo(MF);
+
+ 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);
}
- EmitFunctionBody();
- return false;
}
-void AMDGPUAsmPrinter::EmitProgramInfo(MachineFunction &MF) {
+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());
+ const SIRegisterInfo *RI
+ = static_cast<const SIRegisterInfo*>(TM.getRegisterInfo());
- for (MachineFunction::iterator BB = MF.begin(), BB_E = MF.end();
- BB != BB_E; ++BB) {
- MachineBasicBlock &MBB = *BB;
- for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
- I != E; ++I) {
- MachineInstr &MI = *I;
+ 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++) {
- MachineOperand & MO = MI.getOperand(op_idx);
- unsigned maxUsed;
+ const MachineOperand &MO = MI.getOperand(op_idx);
unsigned width = 0;
bool isSGPR = false;
- unsigned reg;
- unsigned hwReg;
+
if (!MO.isReg()) {
continue;
}
- reg = MO.getReg();
- if (reg == AMDGPU::VCC) {
+ 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;
} 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_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 {
- assert(!"Unknown register class");
+ llvm_unreachable("Unknown register class");
}
- hwReg = RI->getEncodingValue(reg) & 0xff;
- maxUsed = hwReg + width - 1;
+ unsigned hwReg = RI->getEncodingValue(reg) & 0xff;
+ unsigned maxUsed = hwReg + width - 1;
if (isSGPR) {
MaxSGPR = maxUsed > MaxSGPR ? maxUsed : MaxSGPR;
} else {
}
}
}
- if (VCCUsed) {
+
+ 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);
}
- SIMachineFunctionInfo * MFI = MF.getInfo<SIMachineFunctionInfo>();
- OutStreamer.EmitIntValue(MaxSGPR + 1, 4);
- OutStreamer.EmitIntValue(MaxVGPR + 1, 4);
- OutStreamer.EmitIntValue(MFI->PSInputAddr, 4);
}
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