1 //===-- AMDGPUAsmPrinter.cpp - AMDGPU Assebly printer --------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
12 /// The AMDGPUAsmPrinter is used to print both assembly string and also binary
13 /// code. When passed an MCAsmStreamer it prints assembly and when passed
14 /// an MCObjectStreamer it outputs binary code.
16 //===----------------------------------------------------------------------===//
19 #include "AMDGPUAsmPrinter.h"
21 #include "AMDGPUSubtarget.h"
22 #include "AMDGPUTargetMachine.h"
23 #include "InstPrinter/AMDGPUInstPrinter.h"
24 #include "MCTargetDesc/AMDGPUTargetStreamer.h"
25 #include "R600Defines.h"
26 #include "R600MachineFunctionInfo.h"
27 #include "R600RegisterInfo.h"
28 #include "SIDefines.h"
29 #include "SIInstrInfo.h"
30 #include "SIMachineFunctionInfo.h"
31 #include "SIRegisterInfo.h"
32 #include "Utils/AMDGPUBaseInfo.h"
33 #include "llvm/BinaryFormat/ELF.h"
34 #include "llvm/CodeGen/MachineFrameInfo.h"
35 #include "llvm/IR/DiagnosticInfo.h"
36 #include "llvm/MC/MCContext.h"
37 #include "llvm/MC/MCSectionELF.h"
38 #include "llvm/MC/MCStreamer.h"
39 #include "llvm/Support/MathExtras.h"
40 #include "llvm/Support/TargetRegistry.h"
41 #include "llvm/Target/TargetLoweringObjectFile.h"
45 // TODO: This should get the default rounding mode from the kernel. We just set
46 // the default here, but this could change if the OpenCL rounding mode pragmas
49 // The denormal mode here should match what is reported by the OpenCL runtime
50 // for the CL_FP_DENORM bit from CL_DEVICE_{HALF|SINGLE|DOUBLE}_FP_CONFIG, but
51 // can also be override to flush with the -cl-denorms-are-zero compiler flag.
53 // AMD OpenCL only sets flush none and reports CL_FP_DENORM for double
54 // precision, and leaves single precision to flush all and does not report
55 // CL_FP_DENORM for CL_DEVICE_SINGLE_FP_CONFIG. Mesa's OpenCL currently reports
56 // CL_FP_DENORM for both.
58 // FIXME: It seems some instructions do not support single precision denormals
59 // regardless of the mode (exp_*_f32, rcp_*_f32, rsq_*_f32, rsq_*f32, sqrt_f32,
60 // and sin_f32, cos_f32 on most parts).
62 // We want to use these instructions, and using fp32 denormals also causes
63 // instructions to run at the double precision rate for the device so it's
64 // probably best to just report no single precision denormals.
65 static uint32_t getFPMode(const MachineFunction &F) {
66 const SISubtarget& ST = F.getSubtarget<SISubtarget>();
67 // TODO: Is there any real use for the flush in only / flush out only modes?
69 uint32_t FP32Denormals =
70 ST.hasFP32Denormals() ? FP_DENORM_FLUSH_NONE : FP_DENORM_FLUSH_IN_FLUSH_OUT;
72 uint32_t FP64Denormals =
73 ST.hasFP64Denormals() ? FP_DENORM_FLUSH_NONE : FP_DENORM_FLUSH_IN_FLUSH_OUT;
75 return FP_ROUND_MODE_SP(FP_ROUND_ROUND_TO_NEAREST) |
76 FP_ROUND_MODE_DP(FP_ROUND_ROUND_TO_NEAREST) |
77 FP_DENORM_MODE_SP(FP32Denormals) |
78 FP_DENORM_MODE_DP(FP64Denormals);
82 createAMDGPUAsmPrinterPass(TargetMachine &tm,
83 std::unique_ptr<MCStreamer> &&Streamer) {
84 return new AMDGPUAsmPrinter(tm, std::move(Streamer));
87 extern "C" void LLVMInitializeAMDGPUAsmPrinter() {
88 TargetRegistry::RegisterAsmPrinter(getTheAMDGPUTarget(),
89 createAMDGPUAsmPrinterPass);
90 TargetRegistry::RegisterAsmPrinter(getTheGCNTarget(),
91 createAMDGPUAsmPrinterPass);
94 AMDGPUAsmPrinter::AMDGPUAsmPrinter(TargetMachine &TM,
95 std::unique_ptr<MCStreamer> Streamer)
96 : AsmPrinter(TM, std::move(Streamer)) {
97 AMDGPUASI = static_cast<AMDGPUTargetMachine*>(&TM)->getAMDGPUAS();
100 StringRef AMDGPUAsmPrinter::getPassName() const {
101 return "AMDGPU Assembly Printer";
104 const MCSubtargetInfo* AMDGPUAsmPrinter::getSTI() const {
105 return TM.getMCSubtargetInfo();
108 AMDGPUTargetStreamer& AMDGPUAsmPrinter::getTargetStreamer() const {
109 return static_cast<AMDGPUTargetStreamer&>(*OutStreamer->getTargetStreamer());
112 void AMDGPUAsmPrinter::EmitStartOfAsmFile(Module &M) {
113 if (TM.getTargetTriple().getOS() != Triple::AMDHSA)
116 AMDGPU::IsaInfo::IsaVersion ISA =
117 AMDGPU::IsaInfo::getIsaVersion(getSTI()->getFeatureBits());
119 getTargetStreamer().EmitDirectiveHSACodeObjectVersion(2, 1);
120 getTargetStreamer().EmitDirectiveHSACodeObjectISA(
121 ISA.Major, ISA.Minor, ISA.Stepping, "AMD", "AMDGPU");
122 getTargetStreamer().EmitStartOfCodeObjectMetadata(M);
125 void AMDGPUAsmPrinter::EmitEndOfAsmFile(Module &M) {
126 if (TM.getTargetTriple().getOS() != Triple::AMDHSA)
129 getTargetStreamer().EmitEndOfCodeObjectMetadata();
132 bool AMDGPUAsmPrinter::isBlockOnlyReachableByFallthrough(
133 const MachineBasicBlock *MBB) const {
134 if (!AsmPrinter::isBlockOnlyReachableByFallthrough(MBB))
140 // If this is a block implementing a long branch, an expression relative to
141 // the start of the block is needed. to the start of the block.
142 // XXX - Is there a smarter way to check this?
143 return (MBB->back().getOpcode() != AMDGPU::S_SETPC_B64);
146 void AMDGPUAsmPrinter::EmitFunctionBodyStart() {
147 const AMDGPUMachineFunction *MFI = MF->getInfo<AMDGPUMachineFunction>();
148 if (!MFI->isEntryFunction())
151 const AMDGPUSubtarget &STM = MF->getSubtarget<AMDGPUSubtarget>();
152 amd_kernel_code_t KernelCode;
153 if (STM.isAmdCodeObjectV2(*MF)) {
154 getAmdKernelCode(KernelCode, CurrentProgramInfo, *MF);
156 OutStreamer->SwitchSection(getObjFileLowering().getTextSection());
157 getTargetStreamer().EmitAMDKernelCodeT(KernelCode);
160 if (TM.getTargetTriple().getOS() != Triple::AMDHSA)
162 getTargetStreamer().EmitKernelCodeObjectMetadata(*MF->getFunction(),
166 void AMDGPUAsmPrinter::EmitFunctionEntryLabel() {
167 const SIMachineFunctionInfo *MFI = MF->getInfo<SIMachineFunctionInfo>();
168 const AMDGPUSubtarget &STM = MF->getSubtarget<AMDGPUSubtarget>();
169 if (MFI->isEntryFunction() && STM.isAmdCodeObjectV2(*MF)) {
170 SmallString<128> SymbolName;
171 getNameWithPrefix(SymbolName, MF->getFunction()),
172 getTargetStreamer().EmitAMDGPUSymbolType(
173 SymbolName, ELF::STT_AMDGPU_HSA_KERNEL);
176 AsmPrinter::EmitFunctionEntryLabel();
179 void AMDGPUAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
181 // Group segment variables aren't emitted in HSA.
182 if (AMDGPU::isGroupSegment(GV, AMDGPUASI))
185 AsmPrinter::EmitGlobalVariable(GV);
188 bool AMDGPUAsmPrinter::doFinalization(Module &M) {
189 CallGraphResourceInfo.clear();
190 return AsmPrinter::doFinalization(M);
193 // Print comments that apply to both callable functions and entry points.
194 void AMDGPUAsmPrinter::emitCommonFunctionComments(
197 uint32_t ScratchSize,
199 OutStreamer->emitRawComment(" codeLenInByte = " + Twine(CodeSize), false);
200 OutStreamer->emitRawComment(" NumSgprs: " + Twine(NumSGPR), false);
201 OutStreamer->emitRawComment(" NumVgprs: " + Twine(NumVGPR), false);
202 OutStreamer->emitRawComment(" ScratchSize: " + Twine(ScratchSize), false);
205 bool AMDGPUAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
206 CurrentProgramInfo = SIProgramInfo();
208 const AMDGPUMachineFunction *MFI = MF.getInfo<AMDGPUMachineFunction>();
210 // The starting address of all shader programs must be 256 bytes aligned.
211 // Regular functions just need the basic required instruction alignment.
212 MF.setAlignment(MFI->isEntryFunction() ? 8 : 2);
214 SetupMachineFunction(MF);
216 const AMDGPUSubtarget &STM = MF.getSubtarget<AMDGPUSubtarget>();
217 MCContext &Context = getObjFileLowering().getContext();
218 if (!STM.isAmdHsaOS()) {
219 MCSectionELF *ConfigSection =
220 Context.getELFSection(".AMDGPU.config", ELF::SHT_PROGBITS, 0);
221 OutStreamer->SwitchSection(ConfigSection);
224 if (STM.getGeneration() >= AMDGPUSubtarget::SOUTHERN_ISLANDS) {
225 if (MFI->isEntryFunction()) {
226 getSIProgramInfo(CurrentProgramInfo, MF);
228 auto I = CallGraphResourceInfo.insert(
229 std::make_pair(MF.getFunction(), SIFunctionResourceInfo()));
230 SIFunctionResourceInfo &Info = I.first->second;
231 assert(I.second && "should only be called once per function");
232 Info = analyzeResourceUsage(MF);
235 if (!STM.isAmdHsaOS()) {
236 EmitProgramInfoSI(MF, CurrentProgramInfo);
239 EmitProgramInfoR600(MF);
244 DisasmLineMaxLen = 0;
249 MCSectionELF *CommentSection =
250 Context.getELFSection(".AMDGPU.csdata", ELF::SHT_PROGBITS, 0);
251 OutStreamer->SwitchSection(CommentSection);
253 if (STM.getGeneration() >= AMDGPUSubtarget::SOUTHERN_ISLANDS) {
254 if (!MFI->isEntryFunction()) {
255 OutStreamer->emitRawComment(" Function info:", false);
256 SIFunctionResourceInfo &Info = CallGraphResourceInfo[MF.getFunction()];
257 emitCommonFunctionComments(
259 Info.getTotalNumSGPRs(MF.getSubtarget<SISubtarget>()),
260 Info.PrivateSegmentSize,
261 getFunctionCodeSize(MF));
265 OutStreamer->emitRawComment(" Kernel info:", false);
266 emitCommonFunctionComments(CurrentProgramInfo.NumVGPR,
267 CurrentProgramInfo.NumSGPR,
268 CurrentProgramInfo.ScratchSize,
269 getFunctionCodeSize(MF));
271 OutStreamer->emitRawComment(
272 " FloatMode: " + Twine(CurrentProgramInfo.FloatMode), false);
273 OutStreamer->emitRawComment(
274 " IeeeMode: " + Twine(CurrentProgramInfo.IEEEMode), false);
275 OutStreamer->emitRawComment(
276 " LDSByteSize: " + Twine(CurrentProgramInfo.LDSSize) +
277 " bytes/workgroup (compile time only)", false);
279 OutStreamer->emitRawComment(
280 " SGPRBlocks: " + Twine(CurrentProgramInfo.SGPRBlocks), false);
281 OutStreamer->emitRawComment(
282 " VGPRBlocks: " + Twine(CurrentProgramInfo.VGPRBlocks), false);
284 OutStreamer->emitRawComment(
285 " NumSGPRsForWavesPerEU: " +
286 Twine(CurrentProgramInfo.NumSGPRsForWavesPerEU), false);
287 OutStreamer->emitRawComment(
288 " NumVGPRsForWavesPerEU: " +
289 Twine(CurrentProgramInfo.NumVGPRsForWavesPerEU), false);
291 OutStreamer->emitRawComment(
292 " ReservedVGPRFirst: " + Twine(CurrentProgramInfo.ReservedVGPRFirst),
294 OutStreamer->emitRawComment(
295 " ReservedVGPRCount: " + Twine(CurrentProgramInfo.ReservedVGPRCount),
298 if (MF.getSubtarget<SISubtarget>().debuggerEmitPrologue()) {
299 OutStreamer->emitRawComment(
300 " DebuggerWavefrontPrivateSegmentOffsetSGPR: s" +
301 Twine(CurrentProgramInfo.DebuggerWavefrontPrivateSegmentOffsetSGPR), false);
302 OutStreamer->emitRawComment(
303 " DebuggerPrivateSegmentBufferSGPR: s" +
304 Twine(CurrentProgramInfo.DebuggerPrivateSegmentBufferSGPR), false);
307 OutStreamer->emitRawComment(
308 " COMPUTE_PGM_RSRC2:USER_SGPR: " +
309 Twine(G_00B84C_USER_SGPR(CurrentProgramInfo.ComputePGMRSrc2)), false);
310 OutStreamer->emitRawComment(
311 " COMPUTE_PGM_RSRC2:TRAP_HANDLER: " +
312 Twine(G_00B84C_TRAP_HANDLER(CurrentProgramInfo.ComputePGMRSrc2)), false);
313 OutStreamer->emitRawComment(
314 " COMPUTE_PGM_RSRC2:TGID_X_EN: " +
315 Twine(G_00B84C_TGID_X_EN(CurrentProgramInfo.ComputePGMRSrc2)), false);
316 OutStreamer->emitRawComment(
317 " COMPUTE_PGM_RSRC2:TGID_Y_EN: " +
318 Twine(G_00B84C_TGID_Y_EN(CurrentProgramInfo.ComputePGMRSrc2)), false);
319 OutStreamer->emitRawComment(
320 " COMPUTE_PGM_RSRC2:TGID_Z_EN: " +
321 Twine(G_00B84C_TGID_Z_EN(CurrentProgramInfo.ComputePGMRSrc2)), false);
322 OutStreamer->emitRawComment(
323 " COMPUTE_PGM_RSRC2:TIDIG_COMP_CNT: " +
324 Twine(G_00B84C_TIDIG_COMP_CNT(CurrentProgramInfo.ComputePGMRSrc2)),
327 R600MachineFunctionInfo *MFI = MF.getInfo<R600MachineFunctionInfo>();
328 OutStreamer->emitRawComment(
329 Twine("SQ_PGM_RESOURCES:STACK_SIZE = " + Twine(MFI->CFStackSize)));
333 if (STM.dumpCode()) {
335 OutStreamer->SwitchSection(
336 Context.getELFSection(".AMDGPU.disasm", ELF::SHT_NOTE, 0));
338 for (size_t i = 0; i < DisasmLines.size(); ++i) {
339 std::string Comment(DisasmLineMaxLen - DisasmLines[i].size(), ' ');
340 Comment += " ; " + HexLines[i] + "\n";
342 OutStreamer->EmitBytes(StringRef(DisasmLines[i]));
343 OutStreamer->EmitBytes(StringRef(Comment));
350 void AMDGPUAsmPrinter::EmitProgramInfoR600(const MachineFunction &MF) {
352 bool killPixel = false;
353 const R600Subtarget &STM = MF.getSubtarget<R600Subtarget>();
354 const R600RegisterInfo *RI = STM.getRegisterInfo();
355 const R600MachineFunctionInfo *MFI = MF.getInfo<R600MachineFunctionInfo>();
357 for (const MachineBasicBlock &MBB : MF) {
358 for (const MachineInstr &MI : MBB) {
359 if (MI.getOpcode() == AMDGPU::KILLGT)
361 unsigned numOperands = MI.getNumOperands();
362 for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) {
363 const MachineOperand &MO = MI.getOperand(op_idx);
366 unsigned HWReg = RI->getHWRegIndex(MO.getReg());
368 // Register with value > 127 aren't GPR
371 MaxGPR = std::max(MaxGPR, HWReg);
377 if (STM.getGeneration() >= R600Subtarget::EVERGREEN) {
378 // Evergreen / Northern Islands
379 switch (MF.getFunction()->getCallingConv()) {
380 default: LLVM_FALLTHROUGH;
381 case CallingConv::AMDGPU_CS: RsrcReg = R_0288D4_SQ_PGM_RESOURCES_LS; break;
382 case CallingConv::AMDGPU_GS: RsrcReg = R_028878_SQ_PGM_RESOURCES_GS; break;
383 case CallingConv::AMDGPU_PS: RsrcReg = R_028844_SQ_PGM_RESOURCES_PS; break;
384 case CallingConv::AMDGPU_VS: RsrcReg = R_028860_SQ_PGM_RESOURCES_VS; break;
388 switch (MF.getFunction()->getCallingConv()) {
389 default: LLVM_FALLTHROUGH;
390 case CallingConv::AMDGPU_GS: LLVM_FALLTHROUGH;
391 case CallingConv::AMDGPU_CS: LLVM_FALLTHROUGH;
392 case CallingConv::AMDGPU_VS: RsrcReg = R_028868_SQ_PGM_RESOURCES_VS; break;
393 case CallingConv::AMDGPU_PS: RsrcReg = R_028850_SQ_PGM_RESOURCES_PS; break;
397 OutStreamer->EmitIntValue(RsrcReg, 4);
398 OutStreamer->EmitIntValue(S_NUM_GPRS(MaxGPR + 1) |
399 S_STACK_SIZE(MFI->CFStackSize), 4);
400 OutStreamer->EmitIntValue(R_02880C_DB_SHADER_CONTROL, 4);
401 OutStreamer->EmitIntValue(S_02880C_KILL_ENABLE(killPixel), 4);
403 if (AMDGPU::isCompute(MF.getFunction()->getCallingConv())) {
404 OutStreamer->EmitIntValue(R_0288E8_SQ_LDS_ALLOC, 4);
405 OutStreamer->EmitIntValue(alignTo(MFI->getLDSSize(), 4) >> 2, 4);
409 uint64_t AMDGPUAsmPrinter::getFunctionCodeSize(const MachineFunction &MF) const {
410 const SISubtarget &STM = MF.getSubtarget<SISubtarget>();
411 const SIInstrInfo *TII = STM.getInstrInfo();
413 uint64_t CodeSize = 0;
415 for (const MachineBasicBlock &MBB : MF) {
416 for (const MachineInstr &MI : MBB) {
417 // TODO: CodeSize should account for multiple functions.
419 // TODO: Should we count size of debug info?
420 if (MI.isDebugValue())
423 CodeSize += TII->getInstSizeInBytes(MI);
430 static bool hasAnyNonFlatUseOfReg(const MachineRegisterInfo &MRI,
431 const SIInstrInfo &TII,
433 for (const MachineOperand &UseOp : MRI.reg_operands(Reg)) {
434 if (!UseOp.isImplicit() || !TII.isFLAT(*UseOp.getParent()))
441 static unsigned getNumExtraSGPRs(const SISubtarget &ST,
444 unsigned ExtraSGPRs = 0;
448 if (ST.getGeneration() < SISubtarget::VOLCANIC_ISLANDS) {
452 if (ST.isXNACKEnabled())
462 int32_t AMDGPUAsmPrinter::SIFunctionResourceInfo::getTotalNumSGPRs(
463 const SISubtarget &ST) const {
464 return NumExplicitSGPR + getNumExtraSGPRs(ST, UsesVCC, UsesFlatScratch);
467 AMDGPUAsmPrinter::SIFunctionResourceInfo AMDGPUAsmPrinter::analyzeResourceUsage(
468 const MachineFunction &MF) const {
469 SIFunctionResourceInfo Info;
471 const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
472 const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
473 const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
474 const MachineRegisterInfo &MRI = MF.getRegInfo();
475 const SIInstrInfo *TII = ST.getInstrInfo();
476 const SIRegisterInfo &TRI = TII->getRegisterInfo();
478 Info.UsesFlatScratch = MRI.isPhysRegUsed(AMDGPU::FLAT_SCR_LO) ||
479 MRI.isPhysRegUsed(AMDGPU::FLAT_SCR_HI);
481 // Even if FLAT_SCRATCH is implicitly used, it has no effect if flat
482 // instructions aren't used to access the scratch buffer. Inline assembly may
485 // If we only have implicit uses of flat_scr on flat instructions, it is not
487 if (Info.UsesFlatScratch && !MFI->hasFlatScratchInit() &&
488 (!hasAnyNonFlatUseOfReg(MRI, *TII, AMDGPU::FLAT_SCR) &&
489 !hasAnyNonFlatUseOfReg(MRI, *TII, AMDGPU::FLAT_SCR_LO) &&
490 !hasAnyNonFlatUseOfReg(MRI, *TII, AMDGPU::FLAT_SCR_HI))) {
491 Info.UsesFlatScratch = false;
494 Info.HasDynamicallySizedStack = FrameInfo.hasVarSizedObjects();
495 Info.PrivateSegmentSize = FrameInfo.getStackSize();
498 Info.UsesVCC = MRI.isPhysRegUsed(AMDGPU::VCC_LO) ||
499 MRI.isPhysRegUsed(AMDGPU::VCC_HI);
501 // If there are no calls, MachineRegisterInfo can tell us the used register
504 MCPhysReg HighestVGPRReg = AMDGPU::NoRegister;
505 for (MCPhysReg Reg : reverse(AMDGPU::VGPR_32RegClass.getRegisters())) {
506 if (MRI.isPhysRegUsed(Reg)) {
507 HighestVGPRReg = Reg;
512 MCPhysReg HighestSGPRReg = AMDGPU::NoRegister;
513 for (MCPhysReg Reg : reverse(AMDGPU::SGPR_32RegClass.getRegisters())) {
514 if (MRI.isPhysRegUsed(Reg)) {
515 HighestSGPRReg = Reg;
520 // We found the maximum register index. They start at 0, so add one to get the
521 // number of registers.
522 Info.NumVGPR = HighestVGPRReg == AMDGPU::NoRegister ? 0 :
523 TRI.getHWRegIndex(HighestVGPRReg) + 1;
524 Info.NumExplicitSGPR = HighestSGPRReg == AMDGPU::NoRegister ? 0 :
525 TRI.getHWRegIndex(HighestSGPRReg) + 1;
530 void AMDGPUAsmPrinter::getSIProgramInfo(SIProgramInfo &ProgInfo,
531 const MachineFunction &MF) {
532 SIFunctionResourceInfo Info = analyzeResourceUsage(MF);
534 ProgInfo.NumVGPR = Info.NumVGPR;
535 ProgInfo.NumSGPR = Info.NumExplicitSGPR;
536 ProgInfo.ScratchSize = Info.PrivateSegmentSize;
537 ProgInfo.VCCUsed = Info.UsesVCC;
538 ProgInfo.FlatUsed = Info.UsesFlatScratch;
539 ProgInfo.DynamicCallStack = Info.HasDynamicallySizedStack || Info.HasRecursion;
541 const SISubtarget &STM = MF.getSubtarget<SISubtarget>();
542 const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
543 const SIInstrInfo *TII = STM.getInstrInfo();
544 const SIRegisterInfo *RI = &TII->getRegisterInfo();
546 unsigned ExtraSGPRs = getNumExtraSGPRs(STM,
549 unsigned ExtraVGPRs = STM.getReservedNumVGPRs(MF);
551 // Check the addressable register limit before we add ExtraSGPRs.
552 if (STM.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS &&
553 !STM.hasSGPRInitBug()) {
554 unsigned MaxAddressableNumSGPRs = STM.getAddressableNumSGPRs();
555 if (ProgInfo.NumSGPR > MaxAddressableNumSGPRs) {
556 // This can happen due to a compiler bug or when using inline asm.
557 LLVMContext &Ctx = MF.getFunction()->getContext();
558 DiagnosticInfoResourceLimit Diag(*MF.getFunction(),
559 "addressable scalar registers",
560 ProgInfo.NumSGPR, DS_Error,
562 MaxAddressableNumSGPRs);
564 ProgInfo.NumSGPR = MaxAddressableNumSGPRs - 1;
568 // Account for extra SGPRs and VGPRs reserved for debugger use.
569 ProgInfo.NumSGPR += ExtraSGPRs;
570 ProgInfo.NumVGPR += ExtraVGPRs;
572 // Adjust number of registers used to meet default/requested minimum/maximum
573 // number of waves per execution unit request.
574 ProgInfo.NumSGPRsForWavesPerEU = std::max(
575 std::max(ProgInfo.NumSGPR, 1u), STM.getMinNumSGPRs(MFI->getMaxWavesPerEU()));
576 ProgInfo.NumVGPRsForWavesPerEU = std::max(
577 std::max(ProgInfo.NumVGPR, 1u), STM.getMinNumVGPRs(MFI->getMaxWavesPerEU()));
579 if (STM.getGeneration() <= AMDGPUSubtarget::SEA_ISLANDS ||
580 STM.hasSGPRInitBug()) {
581 unsigned MaxAddressableNumSGPRs = STM.getAddressableNumSGPRs();
582 if (ProgInfo.NumSGPR > MaxAddressableNumSGPRs) {
583 // This can happen due to a compiler bug or when using inline asm to use
584 // the registers which are usually reserved for vcc etc.
585 LLVMContext &Ctx = MF.getFunction()->getContext();
586 DiagnosticInfoResourceLimit Diag(*MF.getFunction(),
588 ProgInfo.NumSGPR, DS_Error,
590 MaxAddressableNumSGPRs);
592 ProgInfo.NumSGPR = MaxAddressableNumSGPRs;
593 ProgInfo.NumSGPRsForWavesPerEU = MaxAddressableNumSGPRs;
597 if (STM.hasSGPRInitBug()) {
599 AMDGPU::IsaInfo::FIXED_NUM_SGPRS_FOR_INIT_BUG;
600 ProgInfo.NumSGPRsForWavesPerEU =
601 AMDGPU::IsaInfo::FIXED_NUM_SGPRS_FOR_INIT_BUG;
604 if (MFI->getNumUserSGPRs() > STM.getMaxNumUserSGPRs()) {
605 LLVMContext &Ctx = MF.getFunction()->getContext();
606 DiagnosticInfoResourceLimit Diag(*MF.getFunction(), "user SGPRs",
607 MFI->getNumUserSGPRs(), DS_Error);
611 if (MFI->getLDSSize() > static_cast<unsigned>(STM.getLocalMemorySize())) {
612 LLVMContext &Ctx = MF.getFunction()->getContext();
613 DiagnosticInfoResourceLimit Diag(*MF.getFunction(), "local memory",
614 MFI->getLDSSize(), DS_Error);
618 // SGPRBlocks is actual number of SGPR blocks minus 1.
619 ProgInfo.SGPRBlocks = alignTo(ProgInfo.NumSGPRsForWavesPerEU,
620 STM.getSGPREncodingGranule());
621 ProgInfo.SGPRBlocks = ProgInfo.SGPRBlocks / STM.getSGPREncodingGranule() - 1;
623 // VGPRBlocks is actual number of VGPR blocks minus 1.
624 ProgInfo.VGPRBlocks = alignTo(ProgInfo.NumVGPRsForWavesPerEU,
625 STM.getVGPREncodingGranule());
626 ProgInfo.VGPRBlocks = ProgInfo.VGPRBlocks / STM.getVGPREncodingGranule() - 1;
628 // Record first reserved VGPR and number of reserved VGPRs.
629 ProgInfo.ReservedVGPRFirst = STM.debuggerReserveRegs() ? ProgInfo.NumVGPR : 0;
630 ProgInfo.ReservedVGPRCount = STM.getReservedNumVGPRs(MF);
632 // Update DebuggerWavefrontPrivateSegmentOffsetSGPR and
633 // DebuggerPrivateSegmentBufferSGPR fields if "amdgpu-debugger-emit-prologue"
634 // attribute was requested.
635 if (STM.debuggerEmitPrologue()) {
636 ProgInfo.DebuggerWavefrontPrivateSegmentOffsetSGPR =
637 RI->getHWRegIndex(MFI->getScratchWaveOffsetReg());
638 ProgInfo.DebuggerPrivateSegmentBufferSGPR =
639 RI->getHWRegIndex(MFI->getScratchRSrcReg());
642 // Set the value to initialize FP_ROUND and FP_DENORM parts of the mode
644 ProgInfo.FloatMode = getFPMode(MF);
646 ProgInfo.IEEEMode = STM.enableIEEEBit(MF);
648 // Make clamp modifier on NaN input returns 0.
649 ProgInfo.DX10Clamp = STM.enableDX10Clamp();
651 unsigned LDSAlignShift;
652 if (STM.getGeneration() < SISubtarget::SEA_ISLANDS) {
653 // LDS is allocated in 64 dword blocks.
656 // LDS is allocated in 128 dword blocks.
660 unsigned LDSSpillSize =
661 MFI->getLDSWaveSpillSize() * MFI->getMaxFlatWorkGroupSize();
663 ProgInfo.LDSSize = MFI->getLDSSize() + LDSSpillSize;
665 alignTo(ProgInfo.LDSSize, 1ULL << LDSAlignShift) >> LDSAlignShift;
667 // Scratch is allocated in 256 dword blocks.
668 unsigned ScratchAlignShift = 10;
669 // We need to program the hardware with the amount of scratch memory that
670 // is used by the entire wave. ProgInfo.ScratchSize is the amount of
671 // scratch memory used per thread.
672 ProgInfo.ScratchBlocks =
673 alignTo(ProgInfo.ScratchSize * STM.getWavefrontSize(),
674 1ULL << ScratchAlignShift) >>
677 ProgInfo.ComputePGMRSrc1 =
678 S_00B848_VGPRS(ProgInfo.VGPRBlocks) |
679 S_00B848_SGPRS(ProgInfo.SGPRBlocks) |
680 S_00B848_PRIORITY(ProgInfo.Priority) |
681 S_00B848_FLOAT_MODE(ProgInfo.FloatMode) |
682 S_00B848_PRIV(ProgInfo.Priv) |
683 S_00B848_DX10_CLAMP(ProgInfo.DX10Clamp) |
684 S_00B848_DEBUG_MODE(ProgInfo.DebugMode) |
685 S_00B848_IEEE_MODE(ProgInfo.IEEEMode);
687 // 0 = X, 1 = XY, 2 = XYZ
688 unsigned TIDIGCompCnt = 0;
689 if (MFI->hasWorkItemIDZ())
691 else if (MFI->hasWorkItemIDY())
694 ProgInfo.ComputePGMRSrc2 =
695 S_00B84C_SCRATCH_EN(ProgInfo.ScratchBlocks > 0) |
696 S_00B84C_USER_SGPR(MFI->getNumUserSGPRs()) |
697 S_00B84C_TRAP_HANDLER(STM.isTrapHandlerEnabled()) |
698 S_00B84C_TGID_X_EN(MFI->hasWorkGroupIDX()) |
699 S_00B84C_TGID_Y_EN(MFI->hasWorkGroupIDY()) |
700 S_00B84C_TGID_Z_EN(MFI->hasWorkGroupIDZ()) |
701 S_00B84C_TG_SIZE_EN(MFI->hasWorkGroupInfo()) |
702 S_00B84C_TIDIG_COMP_CNT(TIDIGCompCnt) |
703 S_00B84C_EXCP_EN_MSB(0) |
704 // For AMDHSA, LDS_SIZE must be zero, as it is populated by the CP.
705 S_00B84C_LDS_SIZE(STM.isAmdHsaOS() ? 0 : ProgInfo.LDSBlocks) |
709 static unsigned getRsrcReg(CallingConv::ID CallConv) {
711 default: LLVM_FALLTHROUGH;
712 case CallingConv::AMDGPU_CS: return R_00B848_COMPUTE_PGM_RSRC1;
713 case CallingConv::AMDGPU_HS: return R_00B428_SPI_SHADER_PGM_RSRC1_HS;
714 case CallingConv::AMDGPU_GS: return R_00B228_SPI_SHADER_PGM_RSRC1_GS;
715 case CallingConv::AMDGPU_PS: return R_00B028_SPI_SHADER_PGM_RSRC1_PS;
716 case CallingConv::AMDGPU_VS: return R_00B128_SPI_SHADER_PGM_RSRC1_VS;
720 void AMDGPUAsmPrinter::EmitProgramInfoSI(const MachineFunction &MF,
721 const SIProgramInfo &CurrentProgramInfo) {
722 const SISubtarget &STM = MF.getSubtarget<SISubtarget>();
723 const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
724 unsigned RsrcReg = getRsrcReg(MF.getFunction()->getCallingConv());
726 if (AMDGPU::isCompute(MF.getFunction()->getCallingConv())) {
727 OutStreamer->EmitIntValue(R_00B848_COMPUTE_PGM_RSRC1, 4);
729 OutStreamer->EmitIntValue(CurrentProgramInfo.ComputePGMRSrc1, 4);
731 OutStreamer->EmitIntValue(R_00B84C_COMPUTE_PGM_RSRC2, 4);
732 OutStreamer->EmitIntValue(CurrentProgramInfo.ComputePGMRSrc2, 4);
734 OutStreamer->EmitIntValue(R_00B860_COMPUTE_TMPRING_SIZE, 4);
735 OutStreamer->EmitIntValue(S_00B860_WAVESIZE(CurrentProgramInfo.ScratchBlocks), 4);
737 // TODO: Should probably note flat usage somewhere. SC emits a "FlatPtr32 =
738 // 0" comment but I don't see a corresponding field in the register spec.
740 OutStreamer->EmitIntValue(RsrcReg, 4);
741 OutStreamer->EmitIntValue(S_00B028_VGPRS(CurrentProgramInfo.VGPRBlocks) |
742 S_00B028_SGPRS(CurrentProgramInfo.SGPRBlocks), 4);
743 if (STM.isVGPRSpillingEnabled(*MF.getFunction())) {
744 OutStreamer->EmitIntValue(R_0286E8_SPI_TMPRING_SIZE, 4);
745 OutStreamer->EmitIntValue(S_0286E8_WAVESIZE(CurrentProgramInfo.ScratchBlocks), 4);
749 if (MF.getFunction()->getCallingConv() == CallingConv::AMDGPU_PS) {
750 OutStreamer->EmitIntValue(R_00B02C_SPI_SHADER_PGM_RSRC2_PS, 4);
751 OutStreamer->EmitIntValue(S_00B02C_EXTRA_LDS_SIZE(CurrentProgramInfo.LDSBlocks), 4);
752 OutStreamer->EmitIntValue(R_0286CC_SPI_PS_INPUT_ENA, 4);
753 OutStreamer->EmitIntValue(MFI->getPSInputEnable(), 4);
754 OutStreamer->EmitIntValue(R_0286D0_SPI_PS_INPUT_ADDR, 4);
755 OutStreamer->EmitIntValue(MFI->getPSInputAddr(), 4);
758 OutStreamer->EmitIntValue(R_SPILLED_SGPRS, 4);
759 OutStreamer->EmitIntValue(MFI->getNumSpilledSGPRs(), 4);
760 OutStreamer->EmitIntValue(R_SPILLED_VGPRS, 4);
761 OutStreamer->EmitIntValue(MFI->getNumSpilledVGPRs(), 4);
764 // This is supposed to be log2(Size)
765 static amd_element_byte_size_t getElementByteSizeValue(unsigned Size) {
768 return AMD_ELEMENT_4_BYTES;
770 return AMD_ELEMENT_8_BYTES;
772 return AMD_ELEMENT_16_BYTES;
774 llvm_unreachable("invalid private_element_size");
778 void AMDGPUAsmPrinter::getAmdKernelCode(amd_kernel_code_t &Out,
779 const SIProgramInfo &CurrentProgramInfo,
780 const MachineFunction &MF) const {
781 const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
782 const SISubtarget &STM = MF.getSubtarget<SISubtarget>();
784 AMDGPU::initDefaultAMDKernelCodeT(Out, STM.getFeatureBits());
786 Out.compute_pgm_resource_registers =
787 CurrentProgramInfo.ComputePGMRSrc1 |
788 (CurrentProgramInfo.ComputePGMRSrc2 << 32);
789 Out.code_properties = AMD_CODE_PROPERTY_IS_PTR64;
791 if (CurrentProgramInfo.DynamicCallStack)
792 Out.code_properties |= AMD_CODE_PROPERTY_IS_DYNAMIC_CALLSTACK;
794 AMD_HSA_BITS_SET(Out.code_properties,
795 AMD_CODE_PROPERTY_PRIVATE_ELEMENT_SIZE,
796 getElementByteSizeValue(STM.getMaxPrivateElementSize()));
798 if (MFI->hasPrivateSegmentBuffer()) {
799 Out.code_properties |=
800 AMD_CODE_PROPERTY_ENABLE_SGPR_PRIVATE_SEGMENT_BUFFER;
803 if (MFI->hasDispatchPtr())
804 Out.code_properties |= AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_PTR;
806 if (MFI->hasQueuePtr())
807 Out.code_properties |= AMD_CODE_PROPERTY_ENABLE_SGPR_QUEUE_PTR;
809 if (MFI->hasKernargSegmentPtr())
810 Out.code_properties |= AMD_CODE_PROPERTY_ENABLE_SGPR_KERNARG_SEGMENT_PTR;
812 if (MFI->hasDispatchID())
813 Out.code_properties |= AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_ID;
815 if (MFI->hasFlatScratchInit())
816 Out.code_properties |= AMD_CODE_PROPERTY_ENABLE_SGPR_FLAT_SCRATCH_INIT;
818 if (MFI->hasGridWorkgroupCountX()) {
819 Out.code_properties |=
820 AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_X;
823 if (MFI->hasGridWorkgroupCountY()) {
824 Out.code_properties |=
825 AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Y;
828 if (MFI->hasGridWorkgroupCountZ()) {
829 Out.code_properties |=
830 AMD_CODE_PROPERTY_ENABLE_SGPR_GRID_WORKGROUP_COUNT_Z;
833 if (MFI->hasDispatchPtr())
834 Out.code_properties |= AMD_CODE_PROPERTY_ENABLE_SGPR_DISPATCH_PTR;
836 if (STM.debuggerSupported())
837 Out.code_properties |= AMD_CODE_PROPERTY_IS_DEBUG_SUPPORTED;
839 if (STM.isXNACKEnabled())
840 Out.code_properties |= AMD_CODE_PROPERTY_IS_XNACK_SUPPORTED;
842 // FIXME: Should use getKernArgSize
843 Out.kernarg_segment_byte_size =
844 STM.getKernArgSegmentSize(MF, MFI->getABIArgOffset());
845 Out.wavefront_sgpr_count = CurrentProgramInfo.NumSGPR;
846 Out.workitem_vgpr_count = CurrentProgramInfo.NumVGPR;
847 Out.workitem_private_segment_byte_size = CurrentProgramInfo.ScratchSize;
848 Out.workgroup_group_segment_byte_size = CurrentProgramInfo.LDSSize;
849 Out.reserved_vgpr_first = CurrentProgramInfo.ReservedVGPRFirst;
850 Out.reserved_vgpr_count = CurrentProgramInfo.ReservedVGPRCount;
852 // These alignment values are specified in powers of two, so alignment =
853 // 2^n. The minimum alignment is 2^4 = 16.
854 Out.kernarg_segment_alignment = std::max((size_t)4,
855 countTrailingZeros(MFI->getMaxKernArgAlign()));
857 if (STM.debuggerEmitPrologue()) {
858 Out.debug_wavefront_private_segment_offset_sgpr =
859 CurrentProgramInfo.DebuggerWavefrontPrivateSegmentOffsetSGPR;
860 Out.debug_private_segment_buffer_sgpr =
861 CurrentProgramInfo.DebuggerPrivateSegmentBufferSGPR;
865 bool AMDGPUAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
867 const char *ExtraCode, raw_ostream &O) {
868 if (ExtraCode && ExtraCode[0]) {
869 if (ExtraCode[1] != 0)
870 return true; // Unknown modifier.
872 switch (ExtraCode[0]) {
874 // See if this is a generic print operand
875 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
881 AMDGPUInstPrinter::printRegOperand(MI->getOperand(OpNo).getReg(), O,
882 *TM.getSubtargetImpl(*MF->getFunction())->getRegisterInfo());