//===- TargetLoweringBase.cpp - Implement the TargetLoweringBase class ----===// // // 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 // //===----------------------------------------------------------------------===// // // This implements the TargetLoweringBase class. // //===----------------------------------------------------------------------===// #include "llvm/ADT/BitVector.h" #include "llvm/ADT/STLExtras.h" #include "llvm/ADT/SmallVector.h" #include "llvm/ADT/StringExtras.h" #include "llvm/ADT/StringRef.h" #include "llvm/ADT/Twine.h" #include "llvm/Analysis/Loads.h" #include "llvm/Analysis/TargetTransformInfo.h" #include "llvm/CodeGen/Analysis.h" #include "llvm/CodeGen/ISDOpcodes.h" #include "llvm/CodeGen/MachineBasicBlock.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineInstr.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineMemOperand.h" #include "llvm/CodeGen/MachineOperand.h" #include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/CodeGen/RuntimeLibcallUtil.h" #include "llvm/CodeGen/StackMaps.h" #include "llvm/CodeGen/TargetLowering.h" #include "llvm/CodeGen/TargetOpcodes.h" #include "llvm/CodeGen/TargetRegisterInfo.h" #include "llvm/CodeGen/ValueTypes.h" #include "llvm/CodeGenTypes/MachineValueType.h" #include "llvm/IR/Attributes.h" #include "llvm/IR/CallingConv.h" #include "llvm/IR/DataLayout.h" #include "llvm/IR/DerivedTypes.h" #include "llvm/IR/Function.h" #include "llvm/IR/GlobalValue.h" #include "llvm/IR/GlobalVariable.h" #include "llvm/IR/IRBuilder.h" #include "llvm/IR/Module.h" #include "llvm/IR/Type.h" #include "llvm/Support/Casting.h" #include "llvm/Support/CommandLine.h" #include "llvm/Support/Compiler.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/MathExtras.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetOptions.h" #include "llvm/TargetParser/Triple.h" #include "llvm/Transforms/Utils/SizeOpts.h" #include <algorithm> #include <cassert> #include <cstdint> #include <cstring> #include <iterator> #include <string> #include <tuple> #include <utility> usingnamespacellvm; static cl::opt<bool> JumpIsExpensiveOverride( "jump-is-expensive", cl::init(false), cl::desc("Do not create extra branches to split comparison logic."), cl::Hidden); static cl::opt<unsigned> MinimumJumpTableEntries ("min-jump-table-entries", cl::init(4), cl::Hidden, cl::desc("Set minimum number of entries to use a jump table.")); static cl::opt<unsigned> MaximumJumpTableSize ("max-jump-table-size", cl::init(UINT_MAX), cl::Hidden, cl::desc("Set maximum size of jump tables.")); /// Minimum jump table density for normal functions. static cl::opt<unsigned> JumpTableDensity("jump-table-density", cl::init(10), cl::Hidden, cl::desc("Minimum density for building a jump table in " "a normal function")); /// Minimum jump table density for -Os or -Oz functions. static cl::opt<unsigned> OptsizeJumpTableDensity( "optsize-jump-table-density", cl::init(40), cl::Hidden, cl::desc("Minimum density for building a jump table in " "an optsize function")); // FIXME: This option is only to test if the strict fp operation processed // correctly by preventing mutating strict fp operation to normal fp operation // during development. When the backend supports strict float operation, this // option will be meaningless. static cl::opt<bool> DisableStrictNodeMutation("disable-strictnode-mutation", cl::desc("Don't mutate strict-float node to a legalize node"), cl::init(false), cl::Hidden); /// GetFPLibCall - Helper to return the right libcall for the given floating /// point type, or UNKNOWN_LIBCALL if there is none. RTLIB::Libcall RTLIB::getFPLibCall(EVT VT, RTLIB::Libcall Call_F32, RTLIB::Libcall Call_F64, RTLIB::Libcall Call_F80, RTLIB::Libcall Call_F128, RTLIB::Libcall Call_PPCF128) { … } /// getFPEXT - Return the FPEXT_*_* value for the given types, or /// UNKNOWN_LIBCALL if there is none. RTLIB::Libcall RTLIB::getFPEXT(EVT OpVT, EVT RetVT) { … } /// getFPROUND - Return the FPROUND_*_* value for the given types, or /// UNKNOWN_LIBCALL if there is none. RTLIB::Libcall RTLIB::getFPROUND(EVT OpVT, EVT RetVT) { … } /// getFPTOSINT - Return the FPTOSINT_*_* value for the given types, or /// UNKNOWN_LIBCALL if there is none. RTLIB::Libcall RTLIB::getFPTOSINT(EVT OpVT, EVT RetVT) { … } /// getFPTOUINT - Return the FPTOUINT_*_* value for the given types, or /// UNKNOWN_LIBCALL if there is none. RTLIB::Libcall RTLIB::getFPTOUINT(EVT OpVT, EVT RetVT) { … } /// getSINTTOFP - Return the SINTTOFP_*_* value for the given types, or /// UNKNOWN_LIBCALL if there is none. RTLIB::Libcall RTLIB::getSINTTOFP(EVT OpVT, EVT RetVT) { … } /// getUINTTOFP - Return the UINTTOFP_*_* value for the given types, or /// UNKNOWN_LIBCALL if there is none. RTLIB::Libcall RTLIB::getUINTTOFP(EVT OpVT, EVT RetVT) { … } RTLIB::Libcall RTLIB::getPOWI(EVT RetVT) { … } RTLIB::Libcall RTLIB::getLDEXP(EVT RetVT) { … } RTLIB::Libcall RTLIB::getFREXP(EVT RetVT) { … } RTLIB::Libcall RTLIB::getFSINCOS(EVT RetVT) { … } RTLIB::Libcall RTLIB::getOutlineAtomicHelper(const Libcall (&LC)[5][4], AtomicOrdering Order, uint64_t MemSize) { … } RTLIB::Libcall RTLIB::getOUTLINE_ATOMIC(unsigned Opc, AtomicOrdering Order, MVT VT) { … } RTLIB::Libcall RTLIB::getSYNC(unsigned Opc, MVT VT) { … } RTLIB::Libcall RTLIB::getMEMCPY_ELEMENT_UNORDERED_ATOMIC(uint64_t ElementSize) { … } RTLIB::Libcall RTLIB::getMEMMOVE_ELEMENT_UNORDERED_ATOMIC(uint64_t ElementSize) { … } RTLIB::Libcall RTLIB::getMEMSET_ELEMENT_UNORDERED_ATOMIC(uint64_t ElementSize) { … } void RTLIB::initCmpLibcallCCs(ISD::CondCode *CmpLibcallCCs) { … } /// NOTE: The TargetMachine owns TLOF. TargetLoweringBase::TargetLoweringBase(const TargetMachine &tm) : … { … } void TargetLoweringBase::initActions() { … } MVT TargetLoweringBase::getScalarShiftAmountTy(const DataLayout &DL, EVT) const { … } EVT TargetLoweringBase::getShiftAmountTy(EVT LHSTy, const DataLayout &DL) const { … } bool TargetLoweringBase::canOpTrap(unsigned Op, EVT VT) const { … } bool TargetLoweringBase::isFreeAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const { … } unsigned TargetLoweringBase::getBitWidthForCttzElements( Type *RetTy, ElementCount EC, bool ZeroIsPoison, const ConstantRange *VScaleRange) const { … } void TargetLoweringBase::setJumpIsExpensive(bool isExpensive) { … } TargetLoweringBase::LegalizeKind TargetLoweringBase::getTypeConversion(LLVMContext &Context, EVT VT) const { … } static unsigned getVectorTypeBreakdownMVT(MVT VT, MVT &IntermediateVT, unsigned &NumIntermediates, MVT &RegisterVT, TargetLoweringBase *TLI) { … } /// isLegalRC - Return true if the value types that can be represented by the /// specified register class are all legal. bool TargetLoweringBase::isLegalRC(const TargetRegisterInfo &TRI, const TargetRegisterClass &RC) const { … } /// Replace/modify any TargetFrameIndex operands with a targte-dependent /// sequence of memory operands that is recognized by PrologEpilogInserter. MachineBasicBlock * TargetLoweringBase::emitPatchPoint(MachineInstr &InitialMI, MachineBasicBlock *MBB) const { … } /// findRepresentativeClass - Return the largest legal super-reg register class /// of the register class for the specified type and its associated "cost". // This function is in TargetLowering because it uses RegClassForVT which would // need to be moved to TargetRegisterInfo and would necessitate moving // isTypeLegal over as well - a massive change that would just require // TargetLowering having a TargetRegisterInfo class member that it would use. std::pair<const TargetRegisterClass *, uint8_t> TargetLoweringBase::findRepresentativeClass(const TargetRegisterInfo *TRI, MVT VT) const { … } /// computeRegisterProperties - Once all of the register classes are added, /// this allows us to compute derived properties we expose. void TargetLoweringBase::computeRegisterProperties( const TargetRegisterInfo *TRI) { … } EVT TargetLoweringBase::getSetCCResultType(const DataLayout &DL, LLVMContext &, EVT VT) const { … } MVT::SimpleValueType TargetLoweringBase::getCmpLibcallReturnType() const { … } /// getVectorTypeBreakdown - Vector types are broken down into some number of /// legal first class types. For example, MVT::v8f32 maps to 2 MVT::v4f32 /// with Altivec or SSE1, or 8 promoted MVT::f64 values with the X86 FP stack. /// Similarly, MVT::v2i64 turns into 4 MVT::i32 values with both PPC and X86. /// /// This method returns the number of registers needed, and the VT for each /// register. It also returns the VT and quantity of the intermediate values /// before they are promoted/expanded. unsigned TargetLoweringBase::getVectorTypeBreakdown(LLVMContext &Context, EVT VT, EVT &IntermediateVT, unsigned &NumIntermediates, MVT &RegisterVT) const { … } bool TargetLoweringBase::isSuitableForJumpTable(const SwitchInst *SI, uint64_t NumCases, uint64_t Range, ProfileSummaryInfo *PSI, BlockFrequencyInfo *BFI) const { … } MVT TargetLoweringBase::getPreferredSwitchConditionType(LLVMContext &Context, EVT ConditionVT) const { … } /// Get the EVTs and ArgFlags collections that represent the legalized return /// type of the given function. This does not require a DAG or a return value, /// and is suitable for use before any DAGs for the function are constructed. /// TODO: Move this out of TargetLowering.cpp. void llvm::GetReturnInfo(CallingConv::ID CC, Type *ReturnType, AttributeList attr, SmallVectorImpl<ISD::OutputArg> &Outs, const TargetLowering &TLI, const DataLayout &DL) { … } /// getByValTypeAlignment - Return the desired alignment for ByVal aggregate /// function arguments in the caller parameter area. This is the actual /// alignment, not its logarithm. uint64_t TargetLoweringBase::getByValTypeAlignment(Type *Ty, const DataLayout &DL) const { … } bool TargetLoweringBase::allowsMemoryAccessForAlignment( LLVMContext &Context, const DataLayout &DL, EVT VT, unsigned AddrSpace, Align Alignment, MachineMemOperand::Flags Flags, unsigned *Fast) const { … } bool TargetLoweringBase::allowsMemoryAccessForAlignment( LLVMContext &Context, const DataLayout &DL, EVT VT, const MachineMemOperand &MMO, unsigned *Fast) const { … } bool TargetLoweringBase::allowsMemoryAccess(LLVMContext &Context, const DataLayout &DL, EVT VT, unsigned AddrSpace, Align Alignment, MachineMemOperand::Flags Flags, unsigned *Fast) const { … } bool TargetLoweringBase::allowsMemoryAccess(LLVMContext &Context, const DataLayout &DL, EVT VT, const MachineMemOperand &MMO, unsigned *Fast) const { … } bool TargetLoweringBase::allowsMemoryAccess(LLVMContext &Context, const DataLayout &DL, LLT Ty, const MachineMemOperand &MMO, unsigned *Fast) const { … } //===----------------------------------------------------------------------===// // TargetTransformInfo Helpers //===----------------------------------------------------------------------===// int TargetLoweringBase::InstructionOpcodeToISD(unsigned Opcode) const { … } Value * TargetLoweringBase::getDefaultSafeStackPointerLocation(IRBuilderBase &IRB, bool UseTLS) const { … } Value * TargetLoweringBase::getSafeStackPointerLocation(IRBuilderBase &IRB) const { … } //===----------------------------------------------------------------------===// // Loop Strength Reduction hooks //===----------------------------------------------------------------------===// /// isLegalAddressingMode - Return true if the addressing mode represented /// by AM is legal for this target, for a load/store of the specified type. bool TargetLoweringBase::isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty, unsigned AS, Instruction *I) const { … } //===----------------------------------------------------------------------===// // Stack Protector //===----------------------------------------------------------------------===// // For OpenBSD return its special guard variable. Otherwise return nullptr, // so that SelectionDAG handle SSP. Value *TargetLoweringBase::getIRStackGuard(IRBuilderBase &IRB) const { … } // Currently only support "standard" __stack_chk_guard. // TODO: add LOAD_STACK_GUARD support. void TargetLoweringBase::insertSSPDeclarations(Module &M) const { … } // Currently only support "standard" __stack_chk_guard. // TODO: add LOAD_STACK_GUARD support. Value *TargetLoweringBase::getSDagStackGuard(const Module &M) const { … } Function *TargetLoweringBase::getSSPStackGuardCheck(const Module &M) const { … } unsigned TargetLoweringBase::getMinimumJumpTableEntries() const { … } void TargetLoweringBase::setMinimumJumpTableEntries(unsigned Val) { … } unsigned TargetLoweringBase::getMinimumJumpTableDensity(bool OptForSize) const { … } unsigned TargetLoweringBase::getMaximumJumpTableSize() const { … } void TargetLoweringBase::setMaximumJumpTableSize(unsigned Val) { … } bool TargetLoweringBase::isJumpTableRelative() const { … } Align TargetLoweringBase::getPrefLoopAlignment(MachineLoop *ML) const { … } unsigned TargetLoweringBase::getMaxPermittedBytesForAlignment( MachineBasicBlock *MBB) const { … } //===----------------------------------------------------------------------===// // Reciprocal Estimates //===----------------------------------------------------------------------===// /// Get the reciprocal estimate attribute string for a function that will /// override the target defaults. static StringRef getRecipEstimateForFunc(MachineFunction &MF) { … } /// Construct a string for the given reciprocal operation of the given type. /// This string should match the corresponding option to the front-end's /// "-mrecip" flag assuming those strings have been passed through in an /// attribute string. For example, "vec-divf" for a division of a vXf32. static std::string getReciprocalOpName(bool IsSqrt, EVT VT) { … } /// Return the character position and value (a single numeric character) of a /// customized refinement operation in the input string if it exists. Return /// false if there is no customized refinement step count. static bool parseRefinementStep(StringRef In, size_t &Position, uint8_t &Value) { … } /// For the input attribute string, return one of the ReciprocalEstimate enum /// status values (enabled, disabled, or not specified) for this operation on /// the specified data type. static int getOpEnabled(bool IsSqrt, EVT VT, StringRef Override) { … } /// For the input attribute string, return the customized refinement step count /// for this operation on the specified data type. If the step count does not /// exist, return the ReciprocalEstimate enum value for unspecified. static int getOpRefinementSteps(bool IsSqrt, EVT VT, StringRef Override) { … } int TargetLoweringBase::getRecipEstimateSqrtEnabled(EVT VT, MachineFunction &MF) const { … } int TargetLoweringBase::getRecipEstimateDivEnabled(EVT VT, MachineFunction &MF) const { … } int TargetLoweringBase::getSqrtRefinementSteps(EVT VT, MachineFunction &MF) const { … } int TargetLoweringBase::getDivRefinementSteps(EVT VT, MachineFunction &MF) const { … } bool TargetLoweringBase::isLoadBitCastBeneficial( EVT LoadVT, EVT BitcastVT, const SelectionDAG &DAG, const MachineMemOperand &MMO) const { … } void TargetLoweringBase::finalizeLowering(MachineFunction &MF) const { … } MachineMemOperand::Flags TargetLoweringBase::getLoadMemOperandFlags( const LoadInst &LI, const DataLayout &DL, AssumptionCache *AC, const TargetLibraryInfo *LibInfo) const { … } MachineMemOperand::Flags TargetLoweringBase::getStoreMemOperandFlags(const StoreInst &SI, const DataLayout &DL) const { … } MachineMemOperand::Flags TargetLoweringBase::getAtomicMemOperandFlags(const Instruction &AI, const DataLayout &DL) const { … } Instruction *TargetLoweringBase::emitLeadingFence(IRBuilderBase &Builder, Instruction *Inst, AtomicOrdering Ord) const { … } Instruction *TargetLoweringBase::emitTrailingFence(IRBuilderBase &Builder, Instruction *Inst, AtomicOrdering Ord) const { … } //===----------------------------------------------------------------------===// // GlobalISel Hooks //===----------------------------------------------------------------------===// bool TargetLoweringBase::shouldLocalize(const MachineInstr &MI, const TargetTransformInfo *TTI) const { … }
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