| //===-- SPIRVPreLegalizer.cpp - prepare IR for legalization -----*- C++ -*-===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // The pass prepares IR for legalization: it assigns SPIR-V types to registers |
| // and removes intrinsics which holded these types during IR translation. |
| // Also it processes constants and registers them in GR to avoid duplication. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "SPIRV.h" |
| #include "SPIRVSubtarget.h" |
| #include "SPIRVUtils.h" |
| #include "llvm/ADT/PostOrderIterator.h" |
| #include "llvm/Analysis/OptimizationRemarkEmitter.h" |
| #include "llvm/CodeGen/GlobalISel/CSEInfo.h" |
| #include "llvm/CodeGen/GlobalISel/GISelValueTracking.h" |
| #include "llvm/IR/Attributes.h" |
| #include "llvm/IR/Constants.h" |
| #include "llvm/IR/DebugInfoMetadata.h" |
| #include "llvm/IR/IntrinsicsSPIRV.h" |
| |
| #define DEBUG_TYPE "spirv-prelegalizer" |
| |
| using namespace llvm; |
| |
| namespace { |
| class SPIRVPreLegalizer : public MachineFunctionPass { |
| public: |
| static char ID; |
| SPIRVPreLegalizer() : MachineFunctionPass(ID) {} |
| bool runOnMachineFunction(MachineFunction &MF) override; |
| void getAnalysisUsage(AnalysisUsage &AU) const override; |
| }; |
| } // namespace |
| |
| void SPIRVPreLegalizer::getAnalysisUsage(AnalysisUsage &AU) const { |
| AU.addPreserved<GISelValueTrackingAnalysis>(); |
| MachineFunctionPass::getAnalysisUsage(AU); |
| } |
| |
| static void |
| addConstantsToTrack(MachineFunction &MF, SPIRVGlobalRegistry *GR, |
| const SPIRVSubtarget &STI, |
| DenseMap<MachineInstr *, Type *> &TargetExtConstTypes) { |
| MachineRegisterInfo &MRI = MF.getRegInfo(); |
| DenseMap<MachineInstr *, Register> RegsAlreadyAddedToDT; |
| SmallVector<MachineInstr *, 10> ToErase, ToEraseComposites; |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| if (!isSpvIntrinsic(MI, Intrinsic::spv_track_constant)) |
| continue; |
| ToErase.push_back(&MI); |
| Register SrcReg = MI.getOperand(2).getReg(); |
| auto *Const = |
| cast<Constant>(cast<ConstantAsMetadata>( |
| MI.getOperand(3).getMetadata()->getOperand(0)) |
| ->getValue()); |
| if (auto *GV = dyn_cast<GlobalValue>(Const)) { |
| Register Reg = GR->find(GV, &MF); |
| if (!Reg.isValid()) { |
| GR->add(GV, MRI.getVRegDef(SrcReg)); |
| GR->addGlobalObject(GV, &MF, SrcReg); |
| } else |
| RegsAlreadyAddedToDT[&MI] = Reg; |
| } else { |
| Register Reg = GR->find(Const, &MF); |
| if (!Reg.isValid()) { |
| if (auto *ConstVec = dyn_cast<ConstantDataVector>(Const)) { |
| auto *BuildVec = MRI.getVRegDef(SrcReg); |
| assert(BuildVec && |
| BuildVec->getOpcode() == TargetOpcode::G_BUILD_VECTOR); |
| GR->add(Const, BuildVec); |
| for (unsigned i = 0; i < ConstVec->getNumElements(); ++i) { |
| // Ensure that OpConstantComposite reuses a constant when it's |
| // already created and available in the same machine function. |
| Constant *ElemConst = ConstVec->getElementAsConstant(i); |
| Register ElemReg = GR->find(ElemConst, &MF); |
| if (!ElemReg.isValid()) |
| GR->add(ElemConst, |
| MRI.getVRegDef(BuildVec->getOperand(1 + i).getReg())); |
| else |
| BuildVec->getOperand(1 + i).setReg(ElemReg); |
| } |
| } |
| if (Const->getType()->isTargetExtTy()) { |
| // remember association so that we can restore it when assign types |
| MachineInstr *SrcMI = MRI.getVRegDef(SrcReg); |
| if (SrcMI) |
| GR->add(Const, SrcMI); |
| if (SrcMI && (SrcMI->getOpcode() == TargetOpcode::G_CONSTANT || |
| SrcMI->getOpcode() == TargetOpcode::G_IMPLICIT_DEF)) |
| TargetExtConstTypes[SrcMI] = Const->getType(); |
| if (Const->isNullValue()) { |
| MachineBasicBlock &DepMBB = MF.front(); |
| MachineIRBuilder MIB(DepMBB, DepMBB.getFirstNonPHI()); |
| SPIRVType *ExtType = GR->getOrCreateSPIRVType( |
| Const->getType(), MIB, SPIRV::AccessQualifier::ReadWrite, |
| true); |
| SrcMI->setDesc(STI.getInstrInfo()->get(SPIRV::OpConstantNull)); |
| SrcMI->addOperand(MachineOperand::CreateReg( |
| GR->getSPIRVTypeID(ExtType), false)); |
| } |
| } |
| } else { |
| RegsAlreadyAddedToDT[&MI] = Reg; |
| // This MI is unused and will be removed. If the MI uses |
| // const_composite, it will be unused and should be removed too. |
| assert(MI.getOperand(2).isReg() && "Reg operand is expected"); |
| MachineInstr *SrcMI = MRI.getVRegDef(MI.getOperand(2).getReg()); |
| if (SrcMI && isSpvIntrinsic(*SrcMI, Intrinsic::spv_const_composite)) |
| ToEraseComposites.push_back(SrcMI); |
| } |
| } |
| } |
| } |
| for (MachineInstr *MI : ToErase) { |
| Register Reg = MI->getOperand(2).getReg(); |
| auto It = RegsAlreadyAddedToDT.find(MI); |
| if (It != RegsAlreadyAddedToDT.end()) |
| Reg = It->second; |
| auto *RC = MRI.getRegClassOrNull(MI->getOperand(0).getReg()); |
| if (!MRI.getRegClassOrNull(Reg) && RC) |
| MRI.setRegClass(Reg, RC); |
| MRI.replaceRegWith(MI->getOperand(0).getReg(), Reg); |
| GR->invalidateMachineInstr(MI); |
| MI->eraseFromParent(); |
| } |
| for (MachineInstr *MI : ToEraseComposites) { |
| GR->invalidateMachineInstr(MI); |
| MI->eraseFromParent(); |
| } |
| } |
| |
| static void foldConstantsIntoIntrinsics(MachineFunction &MF, |
| SPIRVGlobalRegistry *GR, |
| MachineIRBuilder MIB) { |
| SmallVector<MachineInstr *, 64> ToErase; |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| if (!isSpvIntrinsic(MI, Intrinsic::spv_assign_name)) |
| continue; |
| const MDNode *MD = MI.getOperand(2).getMetadata(); |
| StringRef ValueName = cast<MDString>(MD->getOperand(0))->getString(); |
| if (ValueName.size() > 0) { |
| MIB.setInsertPt(*MI.getParent(), MI); |
| buildOpName(MI.getOperand(1).getReg(), ValueName, MIB); |
| } |
| ToErase.push_back(&MI); |
| } |
| for (MachineInstr *MI : ToErase) { |
| GR->invalidateMachineInstr(MI); |
| MI->eraseFromParent(); |
| } |
| ToErase.clear(); |
| } |
| } |
| |
| static MachineInstr *findAssignTypeInstr(Register Reg, |
| MachineRegisterInfo *MRI) { |
| for (MachineRegisterInfo::use_instr_iterator I = MRI->use_instr_begin(Reg), |
| IE = MRI->use_instr_end(); |
| I != IE; ++I) { |
| MachineInstr *UseMI = &*I; |
| if ((isSpvIntrinsic(*UseMI, Intrinsic::spv_assign_ptr_type) || |
| isSpvIntrinsic(*UseMI, Intrinsic::spv_assign_type)) && |
| UseMI->getOperand(1).getReg() == Reg) |
| return UseMI; |
| } |
| return nullptr; |
| } |
| |
| static void buildOpBitcast(SPIRVGlobalRegistry *GR, MachineIRBuilder &MIB, |
| Register ResVReg, Register OpReg) { |
| SPIRVType *ResType = GR->getSPIRVTypeForVReg(ResVReg); |
| SPIRVType *OpType = GR->getSPIRVTypeForVReg(OpReg); |
| assert(ResType && OpType && "Operand types are expected"); |
| if (!GR->isBitcastCompatible(ResType, OpType)) |
| report_fatal_error("incompatible result and operand types in a bitcast"); |
| MachineRegisterInfo *MRI = MIB.getMRI(); |
| if (!MRI->getRegClassOrNull(ResVReg)) |
| MRI->setRegClass(ResVReg, GR->getRegClass(ResType)); |
| if (ResType == OpType) |
| MIB.buildInstr(TargetOpcode::COPY).addDef(ResVReg).addUse(OpReg); |
| else |
| MIB.buildInstr(SPIRV::OpBitcast) |
| .addDef(ResVReg) |
| .addUse(GR->getSPIRVTypeID(ResType)) |
| .addUse(OpReg); |
| } |
| |
| // We do instruction selections early instead of calling MIB.buildBitcast() |
| // generating the general op code G_BITCAST. When MachineVerifier validates |
| // G_BITCAST we see a check of a kind: if Source Type is equal to Destination |
| // Type then report error "bitcast must change the type". This doesn't take into |
| // account the notion of a typed pointer that is important for SPIR-V where a |
| // user may and should use bitcast between pointers with different pointee types |
| // (https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpBitcast). |
| // It's important for correct lowering in SPIR-V, because interpretation of the |
| // data type is not left to instructions that utilize the pointer, but encoded |
| // by the pointer declaration, and the SPIRV target can and must handle the |
| // declaration and use of pointers that specify the type of data they point to. |
| // It's not feasible to improve validation of G_BITCAST using just information |
| // provided by low level types of source and destination. Therefore we don't |
| // produce G_BITCAST as the general op code with semantics different from |
| // OpBitcast, but rather lower to OpBitcast immediately. As for now, the only |
| // difference would be that CombinerHelper couldn't transform known patterns |
| // around G_BUILD_VECTOR. See discussion |
| // in https://github.com/llvm/llvm-project/pull/110270 for even more context. |
| static void selectOpBitcasts(MachineFunction &MF, SPIRVGlobalRegistry *GR, |
| MachineIRBuilder MIB) { |
| SmallVector<MachineInstr *, 16> ToErase; |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| if (MI.getOpcode() != TargetOpcode::G_BITCAST) |
| continue; |
| MIB.setInsertPt(*MI.getParent(), MI); |
| buildOpBitcast(GR, MIB, MI.getOperand(0).getReg(), |
| MI.getOperand(1).getReg()); |
| ToErase.push_back(&MI); |
| } |
| } |
| for (MachineInstr *MI : ToErase) { |
| GR->invalidateMachineInstr(MI); |
| MI->eraseFromParent(); |
| } |
| } |
| |
| static void insertBitcasts(MachineFunction &MF, SPIRVGlobalRegistry *GR, |
| MachineIRBuilder MIB) { |
| // Get access to information about available extensions |
| const SPIRVSubtarget *ST = |
| static_cast<const SPIRVSubtarget *>(&MIB.getMF().getSubtarget()); |
| SmallVector<MachineInstr *, 10> ToErase; |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| if (!isSpvIntrinsic(MI, Intrinsic::spv_bitcast) && |
| !isSpvIntrinsic(MI, Intrinsic::spv_ptrcast)) |
| continue; |
| assert(MI.getOperand(2).isReg()); |
| MIB.setInsertPt(*MI.getParent(), MI); |
| ToErase.push_back(&MI); |
| if (isSpvIntrinsic(MI, Intrinsic::spv_bitcast)) { |
| MIB.buildBitcast(MI.getOperand(0).getReg(), MI.getOperand(2).getReg()); |
| continue; |
| } |
| Register Def = MI.getOperand(0).getReg(); |
| Register Source = MI.getOperand(2).getReg(); |
| Type *ElemTy = getMDOperandAsType(MI.getOperand(3).getMetadata(), 0); |
| SPIRVType *AssignedPtrType = GR->getOrCreateSPIRVPointerType( |
| ElemTy, MI, |
| addressSpaceToStorageClass(MI.getOperand(4).getImm(), *ST)); |
| |
| // If the ptrcast would be redundant, replace all uses with the source |
| // register. |
| MachineRegisterInfo *MRI = MIB.getMRI(); |
| if (GR->getSPIRVTypeForVReg(Source) == AssignedPtrType) { |
| // Erase Def's assign type instruction if we are going to replace Def. |
| if (MachineInstr *AssignMI = findAssignTypeInstr(Def, MRI)) |
| ToErase.push_back(AssignMI); |
| MRI->replaceRegWith(Def, Source); |
| } else { |
| if (!GR->getSPIRVTypeForVReg(Def, &MF)) |
| GR->assignSPIRVTypeToVReg(AssignedPtrType, Def, MF); |
| MIB.buildBitcast(Def, Source); |
| } |
| } |
| } |
| for (MachineInstr *MI : ToErase) { |
| GR->invalidateMachineInstr(MI); |
| MI->eraseFromParent(); |
| } |
| } |
| |
| // Translating GV, IRTranslator sometimes generates following IR: |
| // %1 = G_GLOBAL_VALUE |
| // %2 = COPY %1 |
| // %3 = G_ADDRSPACE_CAST %2 |
| // |
| // or |
| // |
| // %1 = G_ZEXT %2 |
| // G_MEMCPY ... %2 ... |
| // |
| // New registers have no SPIRVType and no register class info. |
| // |
| // Set SPIRVType for GV, propagate it from GV to other instructions, |
| // also set register classes. |
| static SPIRVType *propagateSPIRVType(MachineInstr *MI, SPIRVGlobalRegistry *GR, |
| MachineRegisterInfo &MRI, |
| MachineIRBuilder &MIB) { |
| SPIRVType *SpvType = nullptr; |
| assert(MI && "Machine instr is expected"); |
| if (MI->getOperand(0).isReg()) { |
| Register Reg = MI->getOperand(0).getReg(); |
| SpvType = GR->getSPIRVTypeForVReg(Reg); |
| if (!SpvType) { |
| switch (MI->getOpcode()) { |
| case TargetOpcode::G_FCONSTANT: |
| case TargetOpcode::G_CONSTANT: { |
| MIB.setInsertPt(*MI->getParent(), MI); |
| Type *Ty = MI->getOperand(1).getCImm()->getType(); |
| SpvType = GR->getOrCreateSPIRVType( |
| Ty, MIB, SPIRV::AccessQualifier::ReadWrite, true); |
| break; |
| } |
| case TargetOpcode::G_GLOBAL_VALUE: { |
| MIB.setInsertPt(*MI->getParent(), MI); |
| const GlobalValue *Global = MI->getOperand(1).getGlobal(); |
| Type *ElementTy = toTypedPointer(GR->getDeducedGlobalValueType(Global)); |
| auto *Ty = TypedPointerType::get(ElementTy, |
| Global->getType()->getAddressSpace()); |
| SpvType = GR->getOrCreateSPIRVType( |
| Ty, MIB, SPIRV::AccessQualifier::ReadWrite, true); |
| break; |
| } |
| case TargetOpcode::G_ANYEXT: |
| case TargetOpcode::G_SEXT: |
| case TargetOpcode::G_ZEXT: { |
| if (MI->getOperand(1).isReg()) { |
| if (MachineInstr *DefInstr = |
| MRI.getVRegDef(MI->getOperand(1).getReg())) { |
| if (SPIRVType *Def = propagateSPIRVType(DefInstr, GR, MRI, MIB)) { |
| unsigned CurrentBW = GR->getScalarOrVectorBitWidth(Def); |
| unsigned ExpectedBW = |
| std::max(MRI.getType(Reg).getScalarSizeInBits(), CurrentBW); |
| unsigned NumElements = GR->getScalarOrVectorComponentCount(Def); |
| SpvType = GR->getOrCreateSPIRVIntegerType(ExpectedBW, MIB); |
| if (NumElements > 1) |
| SpvType = GR->getOrCreateSPIRVVectorType(SpvType, NumElements, |
| MIB, true); |
| } |
| } |
| } |
| break; |
| } |
| case TargetOpcode::G_PTRTOINT: |
| SpvType = GR->getOrCreateSPIRVIntegerType( |
| MRI.getType(Reg).getScalarSizeInBits(), MIB); |
| break; |
| case TargetOpcode::G_TRUNC: |
| case TargetOpcode::G_ADDRSPACE_CAST: |
| case TargetOpcode::G_PTR_ADD: |
| case TargetOpcode::COPY: { |
| MachineOperand &Op = MI->getOperand(1); |
| MachineInstr *Def = Op.isReg() ? MRI.getVRegDef(Op.getReg()) : nullptr; |
| if (Def) |
| SpvType = propagateSPIRVType(Def, GR, MRI, MIB); |
| break; |
| } |
| default: |
| break; |
| } |
| if (SpvType) { |
| // check if the address space needs correction |
| LLT RegType = MRI.getType(Reg); |
| if (SpvType->getOpcode() == SPIRV::OpTypePointer && |
| RegType.isPointer() && |
| storageClassToAddressSpace(GR->getPointerStorageClass(SpvType)) != |
| RegType.getAddressSpace()) { |
| const SPIRVSubtarget &ST = |
| MI->getParent()->getParent()->getSubtarget<SPIRVSubtarget>(); |
| auto TSC = addressSpaceToStorageClass(RegType.getAddressSpace(), ST); |
| SpvType = GR->changePointerStorageClass(SpvType, TSC, *MI); |
| } |
| GR->assignSPIRVTypeToVReg(SpvType, Reg, MIB.getMF()); |
| } |
| if (!MRI.getRegClassOrNull(Reg)) |
| MRI.setRegClass(Reg, SpvType ? GR->getRegClass(SpvType) |
| : &SPIRV::iIDRegClass); |
| } |
| } |
| return SpvType; |
| } |
| |
| // To support current approach and limitations wrt. bit width here we widen a |
| // scalar register with a bit width greater than 1 to valid sizes and cap it to |
| // 64 width. |
| static void widenScalarLLTNextPow2(Register Reg, MachineRegisterInfo &MRI) { |
| LLT RegType = MRI.getType(Reg); |
| if (!RegType.isScalar()) |
| return; |
| unsigned Sz = RegType.getScalarSizeInBits(); |
| if (Sz == 1) |
| return; |
| unsigned NewSz = std::min(std::max(1u << Log2_32_Ceil(Sz), 8u), 64u); |
| if (NewSz != Sz) |
| MRI.setType(Reg, LLT::scalar(NewSz)); |
| } |
| |
| static void setInsertPtAfterDef(MachineIRBuilder &MIB, MachineInstr *Def) { |
| MachineBasicBlock &MBB = *Def->getParent(); |
| MachineBasicBlock::iterator DefIt = |
| Def->getNextNode() ? Def->getNextNode()->getIterator() : MBB.end(); |
| // Skip all the PHI and debug instructions. |
| while (DefIt != MBB.end() && |
| (DefIt->isPHI() || DefIt->isDebugOrPseudoInstr())) |
| DefIt = std::next(DefIt); |
| MIB.setInsertPt(MBB, DefIt); |
| } |
| |
| namespace llvm { |
| void insertAssignInstr(Register Reg, Type *Ty, SPIRVType *SpvType, |
| SPIRVGlobalRegistry *GR, MachineIRBuilder &MIB, |
| MachineRegisterInfo &MRI) { |
| assert((Ty || SpvType) && "Either LLVM or SPIRV type is expected."); |
| MachineInstr *Def = MRI.getVRegDef(Reg); |
| setInsertPtAfterDef(MIB, Def); |
| if (!SpvType) |
| SpvType = GR->getOrCreateSPIRVType(Ty, MIB, |
| SPIRV::AccessQualifier::ReadWrite, true); |
| |
| if (!isTypeFoldingSupported(Def->getOpcode())) { |
| // No need to generate SPIRV::ASSIGN_TYPE pseudo-instruction |
| if (!MRI.getRegClassOrNull(Reg)) |
| MRI.setRegClass(Reg, GR->getRegClass(SpvType)); |
| if (!MRI.getType(Reg).isValid()) |
| MRI.setType(Reg, GR->getRegType(SpvType)); |
| GR->assignSPIRVTypeToVReg(SpvType, Reg, MIB.getMF()); |
| return; |
| } |
| |
| // Tablegen definition assumes SPIRV::ASSIGN_TYPE pseudo-instruction is |
| // present after each auto-folded instruction to take a type reference from. |
| Register NewReg = MRI.createGenericVirtualRegister(MRI.getType(Reg)); |
| if (auto *RC = MRI.getRegClassOrNull(Reg)) { |
| MRI.setRegClass(NewReg, RC); |
| } else { |
| auto RegClass = GR->getRegClass(SpvType); |
| MRI.setRegClass(NewReg, RegClass); |
| MRI.setRegClass(Reg, RegClass); |
| } |
| GR->assignSPIRVTypeToVReg(SpvType, Reg, MIB.getMF()); |
| // This is to make it convenient for Legalizer to get the SPIRVType |
| // when processing the actual MI (i.e. not pseudo one). |
| GR->assignSPIRVTypeToVReg(SpvType, NewReg, MIB.getMF()); |
| // Copy MIFlags from Def to ASSIGN_TYPE instruction. It's required to keep |
| // the flags after instruction selection. |
| const uint32_t Flags = Def->getFlags(); |
| MIB.buildInstr(SPIRV::ASSIGN_TYPE) |
| .addDef(Reg) |
| .addUse(NewReg) |
| .addUse(GR->getSPIRVTypeID(SpvType)) |
| .setMIFlags(Flags); |
| for (unsigned I = 0, E = Def->getNumDefs(); I != E; ++I) { |
| MachineOperand &MO = Def->getOperand(I); |
| if (MO.getReg() == Reg) { |
| MO.setReg(NewReg); |
| break; |
| } |
| } |
| } |
| |
| void processInstr(MachineInstr &MI, MachineIRBuilder &MIB, |
| MachineRegisterInfo &MRI, SPIRVGlobalRegistry *GR, |
| SPIRVType *KnownResType) { |
| MIB.setInsertPt(*MI.getParent(), MI.getIterator()); |
| for (auto &Op : MI.operands()) { |
| if (!Op.isReg() || Op.isDef()) |
| continue; |
| Register OpReg = Op.getReg(); |
| SPIRVType *SpvType = GR->getSPIRVTypeForVReg(OpReg); |
| if (!SpvType && KnownResType) { |
| SpvType = KnownResType; |
| GR->assignSPIRVTypeToVReg(KnownResType, OpReg, *MI.getMF()); |
| } |
| assert(SpvType); |
| if (!MRI.getRegClassOrNull(OpReg)) |
| MRI.setRegClass(OpReg, GR->getRegClass(SpvType)); |
| if (!MRI.getType(OpReg).isValid()) |
| MRI.setType(OpReg, GR->getRegType(SpvType)); |
| } |
| } |
| } // namespace llvm |
| |
| static void |
| generateAssignInstrs(MachineFunction &MF, SPIRVGlobalRegistry *GR, |
| MachineIRBuilder MIB, |
| DenseMap<MachineInstr *, Type *> &TargetExtConstTypes) { |
| // Get access to information about available extensions |
| const SPIRVSubtarget *ST = |
| static_cast<const SPIRVSubtarget *>(&MIB.getMF().getSubtarget()); |
| |
| MachineRegisterInfo &MRI = MF.getRegInfo(); |
| SmallVector<MachineInstr *, 10> ToErase; |
| DenseMap<MachineInstr *, Register> RegsAlreadyAddedToDT; |
| |
| bool IsExtendedInts = |
| ST->canUseExtension( |
| SPIRV::Extension::SPV_INTEL_arbitrary_precision_integers) || |
| ST->canUseExtension(SPIRV::Extension::SPV_KHR_bit_instructions); |
| |
| for (MachineBasicBlock *MBB : post_order(&MF)) { |
| if (MBB->empty()) |
| continue; |
| |
| bool ReachedBegin = false; |
| for (auto MII = std::prev(MBB->end()), Begin = MBB->begin(); |
| !ReachedBegin;) { |
| MachineInstr &MI = *MII; |
| unsigned MIOp = MI.getOpcode(); |
| |
| if (!IsExtendedInts) { |
| // validate bit width of scalar registers |
| for (const auto &MOP : MI.operands()) |
| if (MOP.isReg()) |
| widenScalarLLTNextPow2(MOP.getReg(), MRI); |
| } |
| |
| if (isSpvIntrinsic(MI, Intrinsic::spv_assign_ptr_type)) { |
| Register Reg = MI.getOperand(1).getReg(); |
| MIB.setInsertPt(*MI.getParent(), MI.getIterator()); |
| Type *ElementTy = getMDOperandAsType(MI.getOperand(2).getMetadata(), 0); |
| SPIRVType *AssignedPtrType = GR->getOrCreateSPIRVPointerType( |
| ElementTy, MI, |
| addressSpaceToStorageClass(MI.getOperand(3).getImm(), *ST)); |
| MachineInstr *Def = MRI.getVRegDef(Reg); |
| assert(Def && "Expecting an instruction that defines the register"); |
| // G_GLOBAL_VALUE already has type info. |
| if (Def->getOpcode() != TargetOpcode::G_GLOBAL_VALUE && |
| Def->getOpcode() != SPIRV::ASSIGN_TYPE) |
| insertAssignInstr(Reg, nullptr, AssignedPtrType, GR, MIB, |
| MF.getRegInfo()); |
| ToErase.push_back(&MI); |
| } else if (isSpvIntrinsic(MI, Intrinsic::spv_assign_type)) { |
| Register Reg = MI.getOperand(1).getReg(); |
| Type *Ty = getMDOperandAsType(MI.getOperand(2).getMetadata(), 0); |
| MachineInstr *Def = MRI.getVRegDef(Reg); |
| assert(Def && "Expecting an instruction that defines the register"); |
| // G_GLOBAL_VALUE already has type info. |
| if (Def->getOpcode() != TargetOpcode::G_GLOBAL_VALUE && |
| Def->getOpcode() != SPIRV::ASSIGN_TYPE) |
| insertAssignInstr(Reg, Ty, nullptr, GR, MIB, MF.getRegInfo()); |
| ToErase.push_back(&MI); |
| } else if (MIOp == TargetOpcode::FAKE_USE && MI.getNumOperands() > 0) { |
| MachineInstr *MdMI = MI.getPrevNode(); |
| if (MdMI && isSpvIntrinsic(*MdMI, Intrinsic::spv_value_md)) { |
| // It's an internal service info from before IRTranslator passes. |
| MachineInstr *Def = getVRegDef(MRI, MI.getOperand(0).getReg()); |
| for (unsigned I = 1, E = MI.getNumOperands(); I != E && Def; ++I) |
| if (getVRegDef(MRI, MI.getOperand(I).getReg()) != Def) |
| Def = nullptr; |
| if (Def) { |
| const MDNode *MD = MdMI->getOperand(1).getMetadata(); |
| StringRef ValueName = |
| cast<MDString>(MD->getOperand(1))->getString(); |
| const MDNode *TypeMD = cast<MDNode>(MD->getOperand(0)); |
| Type *ValueTy = getMDOperandAsType(TypeMD, 0); |
| GR->addValueAttrs(Def, std::make_pair(ValueTy, ValueName.str())); |
| } |
| ToErase.push_back(MdMI); |
| } |
| ToErase.push_back(&MI); |
| } else if (MIOp == TargetOpcode::G_CONSTANT || |
| MIOp == TargetOpcode::G_FCONSTANT || |
| MIOp == TargetOpcode::G_BUILD_VECTOR) { |
| // %rc = G_CONSTANT ty Val |
| // ===> |
| // %cty = OpType* ty |
| // %rctmp = G_CONSTANT ty Val |
| // %rc = ASSIGN_TYPE %rctmp, %cty |
| Register Reg = MI.getOperand(0).getReg(); |
| bool NeedAssignType = true; |
| if (MRI.hasOneUse(Reg)) { |
| MachineInstr &UseMI = *MRI.use_instr_begin(Reg); |
| if (isSpvIntrinsic(UseMI, Intrinsic::spv_assign_type) || |
| isSpvIntrinsic(UseMI, Intrinsic::spv_assign_name)) |
| continue; |
| if (UseMI.getOpcode() == SPIRV::ASSIGN_TYPE) |
| NeedAssignType = false; |
| } |
| Type *Ty = nullptr; |
| if (MIOp == TargetOpcode::G_CONSTANT) { |
| auto TargetExtIt = TargetExtConstTypes.find(&MI); |
| Ty = TargetExtIt == TargetExtConstTypes.end() |
| ? MI.getOperand(1).getCImm()->getType() |
| : TargetExtIt->second; |
| const ConstantInt *OpCI = MI.getOperand(1).getCImm(); |
| // TODO: we may wish to analyze here if OpCI is zero and LLT RegType = |
| // MRI.getType(Reg); RegType.isPointer() is true, so that we observe |
| // at this point not i64/i32 constant but null pointer in the |
| // corresponding address space of RegType.getAddressSpace(). This may |
| // help to successfully validate the case when a OpConstantComposite's |
| // constituent has type that does not match Result Type of |
| // OpConstantComposite (see, for example, |
| // pointers/PtrCast-null-in-OpSpecConstantOp.ll). |
| Register PrimaryReg = GR->find(OpCI, &MF); |
| if (!PrimaryReg.isValid()) { |
| GR->add(OpCI, &MI); |
| } else if (PrimaryReg != Reg && |
| MRI.getType(Reg) == MRI.getType(PrimaryReg)) { |
| auto *RCReg = MRI.getRegClassOrNull(Reg); |
| auto *RCPrimary = MRI.getRegClassOrNull(PrimaryReg); |
| if (!RCReg || RCPrimary == RCReg) { |
| RegsAlreadyAddedToDT[&MI] = PrimaryReg; |
| ToErase.push_back(&MI); |
| NeedAssignType = false; |
| } |
| } |
| } else if (MIOp == TargetOpcode::G_FCONSTANT) { |
| Ty = MI.getOperand(1).getFPImm()->getType(); |
| } else { |
| assert(MIOp == TargetOpcode::G_BUILD_VECTOR); |
| Type *ElemTy = nullptr; |
| MachineInstr *ElemMI = MRI.getVRegDef(MI.getOperand(1).getReg()); |
| assert(ElemMI); |
| |
| if (ElemMI->getOpcode() == TargetOpcode::G_CONSTANT) { |
| ElemTy = ElemMI->getOperand(1).getCImm()->getType(); |
| } else if (ElemMI->getOpcode() == TargetOpcode::G_FCONSTANT) { |
| ElemTy = ElemMI->getOperand(1).getFPImm()->getType(); |
| } else { |
| if (const SPIRVType *ElemSpvType = |
| GR->getSPIRVTypeForVReg(MI.getOperand(1).getReg(), &MF)) |
| ElemTy = const_cast<Type *>(GR->getTypeForSPIRVType(ElemSpvType)); |
| if (!ElemTy) { |
| // There may be a case when we already know Reg's type. |
| MachineInstr *NextMI = MI.getNextNode(); |
| if (!NextMI || NextMI->getOpcode() != SPIRV::ASSIGN_TYPE || |
| NextMI->getOperand(1).getReg() != Reg) |
| llvm_unreachable("Unexpected opcode"); |
| } |
| } |
| if (ElemTy) |
| Ty = VectorType::get( |
| ElemTy, MI.getNumExplicitOperands() - MI.getNumExplicitDefs(), |
| false); |
| else |
| NeedAssignType = false; |
| } |
| if (NeedAssignType) |
| insertAssignInstr(Reg, Ty, nullptr, GR, MIB, MRI); |
| } else if (MIOp == TargetOpcode::G_GLOBAL_VALUE) { |
| propagateSPIRVType(&MI, GR, MRI, MIB); |
| } |
| |
| if (MII == Begin) |
| ReachedBegin = true; |
| else |
| --MII; |
| } |
| } |
| for (MachineInstr *MI : ToErase) { |
| auto It = RegsAlreadyAddedToDT.find(MI); |
| if (It != RegsAlreadyAddedToDT.end()) |
| MRI.replaceRegWith(MI->getOperand(0).getReg(), It->second); |
| GR->invalidateMachineInstr(MI); |
| MI->eraseFromParent(); |
| } |
| |
| // Address the case when IRTranslator introduces instructions with new |
| // registers without SPIRVType associated. |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| switch (MI.getOpcode()) { |
| case TargetOpcode::G_TRUNC: |
| case TargetOpcode::G_ANYEXT: |
| case TargetOpcode::G_SEXT: |
| case TargetOpcode::G_ZEXT: |
| case TargetOpcode::G_PTRTOINT: |
| case TargetOpcode::COPY: |
| case TargetOpcode::G_ADDRSPACE_CAST: |
| propagateSPIRVType(&MI, GR, MRI, MIB); |
| break; |
| } |
| } |
| } |
| } |
| |
| static void processInstrsWithTypeFolding(MachineFunction &MF, |
| SPIRVGlobalRegistry *GR, |
| MachineIRBuilder MIB) { |
| MachineRegisterInfo &MRI = MF.getRegInfo(); |
| for (MachineBasicBlock &MBB : MF) |
| for (MachineInstr &MI : MBB) |
| if (isTypeFoldingSupported(MI.getOpcode())) |
| processInstr(MI, MIB, MRI, GR, nullptr); |
| } |
| |
| static Register |
| collectInlineAsmInstrOperands(MachineInstr *MI, |
| SmallVector<unsigned, 4> *Ops = nullptr) { |
| Register DefReg; |
| unsigned StartOp = InlineAsm::MIOp_FirstOperand, |
| AsmDescOp = InlineAsm::MIOp_FirstOperand; |
| for (unsigned Idx = StartOp, MISz = MI->getNumOperands(); Idx != MISz; |
| ++Idx) { |
| const MachineOperand &MO = MI->getOperand(Idx); |
| if (MO.isMetadata()) |
| continue; |
| if (Idx == AsmDescOp && MO.isImm()) { |
| // compute the index of the next operand descriptor |
| const InlineAsm::Flag F(MO.getImm()); |
| AsmDescOp += 1 + F.getNumOperandRegisters(); |
| continue; |
| } |
| if (MO.isReg() && MO.isDef()) { |
| if (!Ops) |
| return MO.getReg(); |
| else |
| DefReg = MO.getReg(); |
| } else if (Ops) { |
| Ops->push_back(Idx); |
| } |
| } |
| return DefReg; |
| } |
| |
| static void |
| insertInlineAsmProcess(MachineFunction &MF, SPIRVGlobalRegistry *GR, |
| const SPIRVSubtarget &ST, MachineIRBuilder MIRBuilder, |
| const SmallVector<MachineInstr *> &ToProcess) { |
| MachineRegisterInfo &MRI = MF.getRegInfo(); |
| Register AsmTargetReg; |
| for (unsigned i = 0, Sz = ToProcess.size(); i + 1 < Sz; i += 2) { |
| MachineInstr *I1 = ToProcess[i], *I2 = ToProcess[i + 1]; |
| assert(isSpvIntrinsic(*I1, Intrinsic::spv_inline_asm) && I2->isInlineAsm()); |
| MIRBuilder.setInsertPt(*I2->getParent(), *I2); |
| |
| if (!AsmTargetReg.isValid()) { |
| // define vendor specific assembly target or dialect |
| AsmTargetReg = MRI.createGenericVirtualRegister(LLT::scalar(32)); |
| MRI.setRegClass(AsmTargetReg, &SPIRV::iIDRegClass); |
| auto AsmTargetMIB = |
| MIRBuilder.buildInstr(SPIRV::OpAsmTargetINTEL).addDef(AsmTargetReg); |
| addStringImm(ST.getTargetTripleAsStr(), AsmTargetMIB); |
| GR->add(AsmTargetMIB.getInstr(), AsmTargetMIB); |
| } |
| |
| // create types |
| const MDNode *IAMD = I1->getOperand(1).getMetadata(); |
| FunctionType *FTy = cast<FunctionType>(getMDOperandAsType(IAMD, 0)); |
| SmallVector<SPIRVType *, 4> ArgTypes; |
| for (const auto &ArgTy : FTy->params()) |
| ArgTypes.push_back(GR->getOrCreateSPIRVType( |
| ArgTy, MIRBuilder, SPIRV::AccessQualifier::ReadWrite, true)); |
| SPIRVType *RetType = |
| GR->getOrCreateSPIRVType(FTy->getReturnType(), MIRBuilder, |
| SPIRV::AccessQualifier::ReadWrite, true); |
| SPIRVType *FuncType = GR->getOrCreateOpTypeFunctionWithArgs( |
| FTy, RetType, ArgTypes, MIRBuilder); |
| |
| // define vendor specific assembly instructions string |
| Register AsmReg = MRI.createGenericVirtualRegister(LLT::scalar(32)); |
| MRI.setRegClass(AsmReg, &SPIRV::iIDRegClass); |
| auto AsmMIB = MIRBuilder.buildInstr(SPIRV::OpAsmINTEL) |
| .addDef(AsmReg) |
| .addUse(GR->getSPIRVTypeID(RetType)) |
| .addUse(GR->getSPIRVTypeID(FuncType)) |
| .addUse(AsmTargetReg); |
| // inline asm string: |
| addStringImm(I2->getOperand(InlineAsm::MIOp_AsmString).getSymbolName(), |
| AsmMIB); |
| // inline asm constraint string: |
| addStringImm(cast<MDString>(I1->getOperand(2).getMetadata()->getOperand(0)) |
| ->getString(), |
| AsmMIB); |
| GR->add(AsmMIB.getInstr(), AsmMIB); |
| |
| // calls the inline assembly instruction |
| unsigned ExtraInfo = I2->getOperand(InlineAsm::MIOp_ExtraInfo).getImm(); |
| if (ExtraInfo & InlineAsm::Extra_HasSideEffects) |
| MIRBuilder.buildInstr(SPIRV::OpDecorate) |
| .addUse(AsmReg) |
| .addImm(static_cast<uint32_t>(SPIRV::Decoration::SideEffectsINTEL)); |
| |
| Register DefReg = collectInlineAsmInstrOperands(I2); |
| if (!DefReg.isValid()) { |
| DefReg = MRI.createGenericVirtualRegister(LLT::scalar(32)); |
| MRI.setRegClass(DefReg, &SPIRV::iIDRegClass); |
| SPIRVType *VoidType = GR->getOrCreateSPIRVType( |
| Type::getVoidTy(MF.getFunction().getContext()), MIRBuilder, |
| SPIRV::AccessQualifier::ReadWrite, true); |
| GR->assignSPIRVTypeToVReg(VoidType, DefReg, MF); |
| } |
| |
| auto AsmCall = MIRBuilder.buildInstr(SPIRV::OpAsmCallINTEL) |
| .addDef(DefReg) |
| .addUse(GR->getSPIRVTypeID(RetType)) |
| .addUse(AsmReg); |
| for (unsigned IntrIdx = 3; IntrIdx < I1->getNumOperands(); ++IntrIdx) |
| AsmCall.addUse(I1->getOperand(IntrIdx).getReg()); |
| } |
| for (MachineInstr *MI : ToProcess) { |
| GR->invalidateMachineInstr(MI); |
| MI->eraseFromParent(); |
| } |
| } |
| |
| static void insertInlineAsm(MachineFunction &MF, SPIRVGlobalRegistry *GR, |
| const SPIRVSubtarget &ST, |
| MachineIRBuilder MIRBuilder) { |
| SmallVector<MachineInstr *> ToProcess; |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| if (isSpvIntrinsic(MI, Intrinsic::spv_inline_asm) || |
| MI.getOpcode() == TargetOpcode::INLINEASM) |
| ToProcess.push_back(&MI); |
| } |
| } |
| if (ToProcess.size() == 0) |
| return; |
| |
| if (!ST.canUseExtension(SPIRV::Extension::SPV_INTEL_inline_assembly)) |
| report_fatal_error("Inline assembly instructions require the " |
| "following SPIR-V extension: SPV_INTEL_inline_assembly", |
| false); |
| |
| insertInlineAsmProcess(MF, GR, ST, MIRBuilder, ToProcess); |
| } |
| |
| static uint32_t convertFloatToSPIRVWord(float F) { |
| union { |
| float F; |
| uint32_t Spir; |
| } FPMaxError; |
| FPMaxError.F = F; |
| return FPMaxError.Spir; |
| } |
| |
| static void insertSpirvDecorations(MachineFunction &MF, SPIRVGlobalRegistry *GR, |
| MachineIRBuilder MIB) { |
| SmallVector<MachineInstr *, 10> ToErase; |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| if (!isSpvIntrinsic(MI, Intrinsic::spv_assign_decoration) && |
| !isSpvIntrinsic(MI, Intrinsic::spv_assign_aliasing_decoration) && |
| !isSpvIntrinsic(MI, Intrinsic::spv_assign_fpmaxerror_decoration)) |
| continue; |
| MIB.setInsertPt(*MI.getParent(), MI.getNextNode()); |
| if (isSpvIntrinsic(MI, Intrinsic::spv_assign_decoration)) { |
| buildOpSpirvDecorations(MI.getOperand(1).getReg(), MIB, |
| MI.getOperand(2).getMetadata()); |
| } else if (isSpvIntrinsic(MI, |
| Intrinsic::spv_assign_fpmaxerror_decoration)) { |
| ConstantFP *OpV = mdconst::dyn_extract<ConstantFP>( |
| MI.getOperand(2).getMetadata()->getOperand(0)); |
| uint32_t OpValue = |
| convertFloatToSPIRVWord(OpV->getValueAPF().convertToFloat()); |
| |
| buildOpDecorate(MI.getOperand(1).getReg(), MIB, |
| SPIRV::Decoration::FPMaxErrorDecorationINTEL, |
| {OpValue}); |
| } else { |
| GR->buildMemAliasingOpDecorate(MI.getOperand(1).getReg(), MIB, |
| MI.getOperand(2).getImm(), |
| MI.getOperand(3).getMetadata()); |
| } |
| |
| ToErase.push_back(&MI); |
| } |
| } |
| for (MachineInstr *MI : ToErase) { |
| GR->invalidateMachineInstr(MI); |
| MI->eraseFromParent(); |
| } |
| } |
| |
| // LLVM allows the switches to use registers as cases, while SPIR-V required |
| // those to be immediate values. This function replaces such operands with the |
| // equivalent immediate constant. |
| static void processSwitchesConstants(MachineFunction &MF, |
| SPIRVGlobalRegistry *GR, |
| MachineIRBuilder MIB) { |
| MachineRegisterInfo &MRI = MF.getRegInfo(); |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| if (!isSpvIntrinsic(MI, Intrinsic::spv_switch)) |
| continue; |
| |
| SmallVector<MachineOperand, 8> NewOperands; |
| NewOperands.push_back(MI.getOperand(0)); // Opcode |
| NewOperands.push_back(MI.getOperand(1)); // Condition |
| NewOperands.push_back(MI.getOperand(2)); // Default |
| for (unsigned i = 3; i < MI.getNumOperands(); i += 2) { |
| Register Reg = MI.getOperand(i).getReg(); |
| MachineInstr *ConstInstr = getDefInstrMaybeConstant(Reg, &MRI); |
| NewOperands.push_back( |
| MachineOperand::CreateCImm(ConstInstr->getOperand(1).getCImm())); |
| |
| NewOperands.push_back(MI.getOperand(i + 1)); |
| } |
| |
| assert(MI.getNumOperands() == NewOperands.size()); |
| while (MI.getNumOperands() > 0) |
| MI.removeOperand(0); |
| for (auto &MO : NewOperands) |
| MI.addOperand(MO); |
| } |
| } |
| } |
| |
| // Some instructions are used during CodeGen but should never be emitted. |
| // Cleaning up those. |
| static void cleanupHelperInstructions(MachineFunction &MF, |
| SPIRVGlobalRegistry *GR) { |
| SmallVector<MachineInstr *, 8> ToEraseMI; |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| if (isSpvIntrinsic(MI, Intrinsic::spv_track_constant) || |
| MI.getOpcode() == TargetOpcode::G_BRINDIRECT) |
| ToEraseMI.push_back(&MI); |
| } |
| } |
| |
| for (MachineInstr *MI : ToEraseMI) { |
| GR->invalidateMachineInstr(MI); |
| MI->eraseFromParent(); |
| } |
| } |
| |
| // Find all usages of G_BLOCK_ADDR in our intrinsics and replace those |
| // operands/registers by the actual MBB it references. |
| static void processBlockAddr(MachineFunction &MF, SPIRVGlobalRegistry *GR, |
| MachineIRBuilder MIB) { |
| // Gather the reverse-mapping BB -> MBB. |
| DenseMap<const BasicBlock *, MachineBasicBlock *> BB2MBB; |
| for (MachineBasicBlock &MBB : MF) |
| BB2MBB[MBB.getBasicBlock()] = &MBB; |
| |
| // Gather instructions requiring patching. For now, only those can use |
| // G_BLOCK_ADDR. |
| SmallVector<MachineInstr *, 8> InstructionsToPatch; |
| for (MachineBasicBlock &MBB : MF) { |
| for (MachineInstr &MI : MBB) { |
| if (isSpvIntrinsic(MI, Intrinsic::spv_switch) || |
| isSpvIntrinsic(MI, Intrinsic::spv_loop_merge) || |
| isSpvIntrinsic(MI, Intrinsic::spv_selection_merge)) |
| InstructionsToPatch.push_back(&MI); |
| } |
| } |
| |
| // For each instruction to fix, we replace all the G_BLOCK_ADDR operands by |
| // the actual MBB it references. Once those references have been updated, we |
| // can cleanup remaining G_BLOCK_ADDR references. |
| SmallPtrSet<MachineBasicBlock *, 8> ClearAddressTaken; |
| SmallPtrSet<MachineInstr *, 8> ToEraseMI; |
| MachineRegisterInfo &MRI = MF.getRegInfo(); |
| for (MachineInstr *MI : InstructionsToPatch) { |
| SmallVector<MachineOperand, 8> NewOps; |
| for (unsigned i = 0; i < MI->getNumOperands(); ++i) { |
| // The operand is not a register, keep as-is. |
| if (!MI->getOperand(i).isReg()) { |
| NewOps.push_back(MI->getOperand(i)); |
| continue; |
| } |
| |
| Register Reg = MI->getOperand(i).getReg(); |
| MachineInstr *BuildMBB = MRI.getVRegDef(Reg); |
| // The register is not the result of G_BLOCK_ADDR, keep as-is. |
| if (!BuildMBB || BuildMBB->getOpcode() != TargetOpcode::G_BLOCK_ADDR) { |
| NewOps.push_back(MI->getOperand(i)); |
| continue; |
| } |
| |
| assert(BuildMBB && BuildMBB->getOpcode() == TargetOpcode::G_BLOCK_ADDR && |
| BuildMBB->getOperand(1).isBlockAddress() && |
| BuildMBB->getOperand(1).getBlockAddress()); |
| BasicBlock *BB = |
| BuildMBB->getOperand(1).getBlockAddress()->getBasicBlock(); |
| auto It = BB2MBB.find(BB); |
| if (It == BB2MBB.end()) |
| report_fatal_error("cannot find a machine basic block by a basic block " |
| "in a switch statement"); |
| MachineBasicBlock *ReferencedBlock = It->second; |
| NewOps.push_back(MachineOperand::CreateMBB(ReferencedBlock)); |
| |
| ClearAddressTaken.insert(ReferencedBlock); |
| ToEraseMI.insert(BuildMBB); |
| } |
| |
| // Replace the operands. |
| assert(MI->getNumOperands() == NewOps.size()); |
| while (MI->getNumOperands() > 0) |
| MI->removeOperand(0); |
| for (auto &MO : NewOps) |
| MI->addOperand(MO); |
| |
| if (MachineInstr *Next = MI->getNextNode()) { |
| if (isSpvIntrinsic(*Next, Intrinsic::spv_track_constant)) { |
| ToEraseMI.insert(Next); |
| Next = MI->getNextNode(); |
| } |
| if (Next && Next->getOpcode() == TargetOpcode::G_BRINDIRECT) |
| ToEraseMI.insert(Next); |
| } |
| } |
| |
| // BlockAddress operands were used to keep information between passes, |
| // let's undo the "address taken" status to reflect that Succ doesn't |
| // actually correspond to an IR-level basic block. |
| for (MachineBasicBlock *Succ : ClearAddressTaken) |
| Succ->setAddressTakenIRBlock(nullptr); |
| |
| // If we just delete G_BLOCK_ADDR instructions with BlockAddress operands, |
| // this leaves their BasicBlock counterparts in a "address taken" status. This |
| // would make AsmPrinter to generate a series of unneeded labels of a "Address |
| // of block that was removed by CodeGen" kind. Let's first ensure that we |
| // don't have a dangling BlockAddress constants by zapping the BlockAddress |
| // nodes, and only after that proceed with erasing G_BLOCK_ADDR instructions. |
| Constant *Replacement = |
| ConstantInt::get(Type::getInt32Ty(MF.getFunction().getContext()), 1); |
| for (MachineInstr *BlockAddrI : ToEraseMI) { |
| if (BlockAddrI->getOpcode() == TargetOpcode::G_BLOCK_ADDR) { |
| BlockAddress *BA = const_cast<BlockAddress *>( |
| BlockAddrI->getOperand(1).getBlockAddress()); |
| BA->replaceAllUsesWith( |
| ConstantExpr::getIntToPtr(Replacement, BA->getType())); |
| BA->destroyConstant(); |
| } |
| GR->invalidateMachineInstr(BlockAddrI); |
| BlockAddrI->eraseFromParent(); |
| } |
| } |
| |
| static bool isImplicitFallthrough(MachineBasicBlock &MBB) { |
| if (MBB.empty()) |
| return true; |
| |
| // Branching SPIR-V intrinsics are not detected by this generic method. |
| // Thus, we can only trust negative result. |
| if (!MBB.canFallThrough()) |
| return false; |
| |
| // Otherwise, we must manually check if we have a SPIR-V intrinsic which |
| // prevent an implicit fallthrough. |
| for (MachineBasicBlock::reverse_iterator It = MBB.rbegin(), E = MBB.rend(); |
| It != E; ++It) { |
| if (isSpvIntrinsic(*It, Intrinsic::spv_switch)) |
| return false; |
| } |
| return true; |
| } |
| |
| static void removeImplicitFallthroughs(MachineFunction &MF, |
| MachineIRBuilder MIB) { |
| // It is valid for MachineBasicBlocks to not finish with a branch instruction. |
| // In such cases, they will simply fallthrough their immediate successor. |
| for (MachineBasicBlock &MBB : MF) { |
| if (!isImplicitFallthrough(MBB)) |
| continue; |
| |
| assert(std::distance(MBB.successors().begin(), MBB.successors().end()) == |
| 1); |
| MIB.setInsertPt(MBB, MBB.end()); |
| MIB.buildBr(**MBB.successors().begin()); |
| } |
| } |
| |
| bool SPIRVPreLegalizer::runOnMachineFunction(MachineFunction &MF) { |
| // Initialize the type registry. |
| const SPIRVSubtarget &ST = MF.getSubtarget<SPIRVSubtarget>(); |
| SPIRVGlobalRegistry *GR = ST.getSPIRVGlobalRegistry(); |
| GR->setCurrentFunc(MF); |
| MachineIRBuilder MIB(MF); |
| // a registry of target extension constants |
| DenseMap<MachineInstr *, Type *> TargetExtConstTypes; |
| // to keep record of tracked constants |
| addConstantsToTrack(MF, GR, ST, TargetExtConstTypes); |
| foldConstantsIntoIntrinsics(MF, GR, MIB); |
| insertBitcasts(MF, GR, MIB); |
| generateAssignInstrs(MF, GR, MIB, TargetExtConstTypes); |
| |
| processSwitchesConstants(MF, GR, MIB); |
| processBlockAddr(MF, GR, MIB); |
| cleanupHelperInstructions(MF, GR); |
| |
| processInstrsWithTypeFolding(MF, GR, MIB); |
| removeImplicitFallthroughs(MF, MIB); |
| insertSpirvDecorations(MF, GR, MIB); |
| insertInlineAsm(MF, GR, ST, MIB); |
| selectOpBitcasts(MF, GR, MIB); |
| |
| return true; |
| } |
| |
| INITIALIZE_PASS(SPIRVPreLegalizer, DEBUG_TYPE, "SPIRV pre legalizer", false, |
| false) |
| |
| char SPIRVPreLegalizer::ID = 0; |
| |
| FunctionPass *llvm::createSPIRVPreLegalizerPass() { |
| return new SPIRVPreLegalizer(); |
| } |
