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//=- LoongArchISelLowering.h - LoongArch DAG Lowering Interface -*- 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
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that LoongArch uses to lower LLVM code into
// a selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_LOONGARCH_LOONGARCHISELLOWERING_H
#define LLVM_LIB_TARGET_LOONGARCH_LOONGARCHISELLOWERING_H
#include "LoongArch.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/TargetLowering.h"
namespace llvm {
class LoongArchSubtarget;
struct LoongArchRegisterInfo;
namespace LoongArchISD {
enum NodeType : unsigned {
FIRST_NUMBER = ISD::BUILTIN_OP_END,
// TODO: add more LoongArchISDs
CALL,
RET,
TAIL,
// 32-bit shifts, directly matching the semantics of the named LoongArch
// instructions.
SLL_W,
SRA_W,
SRL_W,
ROTL_W,
ROTR_W,
// FPR<->GPR transfer operations
MOVGR2FR_W_LA64,
MOVFR2GR_S_LA64,
MOVFCSR2GR,
MOVGR2FCSR,
FTINT,
// Bit counting operations
CLZ_W,
CTZ_W,
BSTRINS,
BSTRPICK,
// Byte-swapping and bit-reversal
REVB_2H,
REVB_2W,
BITREV_4B,
BITREV_W,
// Intrinsic operations start ============================================
BREAK,
CACOP_D,
CACOP_W,
DBAR,
IBAR,
SYSCALL,
// CRC check operations
CRC_W_B_W,
CRC_W_H_W,
CRC_W_W_W,
CRC_W_D_W,
CRCC_W_B_W,
CRCC_W_H_W,
CRCC_W_W_W,
CRCC_W_D_W,
CSRRD,
// Write new value to CSR and return old value.
// Operand 0: A chain pointer.
// Operand 1: The new value to write.
// Operand 2: The address of the required CSR.
// Result 0: The old value of the CSR.
// Result 1: The new chain pointer.
CSRWR,
// Similar to CSRWR but with a write mask.
// Operand 0: A chain pointer.
// Operand 1: The new value to write.
// Operand 2: The write mask.
// Operand 3: The address of the required CSR.
// Result 0: The old value of the CSR.
// Result 1: The new chain pointer.
CSRXCHG,
// IOCSR access operations
IOCSRRD_B,
IOCSRRD_W,
IOCSRRD_H,
IOCSRRD_D,
IOCSRWR_B,
IOCSRWR_H,
IOCSRWR_W,
IOCSRWR_D,
// Read CPU configuration information operation
CPUCFG,
// Intrinsic operations end =============================================
};
} // end namespace LoongArchISD
class LoongArchTargetLowering : public TargetLowering {
const LoongArchSubtarget &Subtarget;
public:
explicit LoongArchTargetLowering(const TargetMachine &TM,
const LoongArchSubtarget &STI);
const LoongArchSubtarget &getSubtarget() const { return Subtarget; }
bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
// Provide custom lowering hooks for some operations.
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) const override;
SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
// This method returns the name of a target specific DAG node.
const char *getTargetNodeName(unsigned Opcode) const override;
// Lower incoming arguments, copy physregs into vregs.
SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
bool IsVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &DL, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const override;
bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context) const override;
SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals, const SDLoc &DL,
SelectionDAG &DAG) const override;
SDValue LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;
bool isCheapToSpeculateCttz(Type *Ty) const override;
bool isCheapToSpeculateCtlz(Type *Ty) const override;
bool hasAndNot(SDValue Y) const override;
TargetLowering::AtomicExpansionKind
shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const override;
Value *emitMaskedAtomicRMWIntrinsic(IRBuilderBase &Builder, AtomicRMWInst *AI,
Value *AlignedAddr, Value *Incr,
Value *Mask, Value *ShiftAmt,
AtomicOrdering Ord) const override;
EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
EVT VT) const override;
TargetLowering::AtomicExpansionKind
shouldExpandAtomicCmpXchgInIR(AtomicCmpXchgInst *CI) const override;
Value *emitMaskedAtomicCmpXchgIntrinsic(IRBuilderBase &Builder,
AtomicCmpXchgInst *CI,
Value *AlignedAddr, Value *CmpVal,
Value *NewVal, Value *Mask,
AtomicOrdering Ord) const override;
bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I,
MachineFunction &MF,
unsigned Intrinsic) const override;
bool isFMAFasterThanFMulAndFAdd(const MachineFunction &MF,
EVT VT) const override;
Register
getExceptionPointerRegister(const Constant *PersonalityFn) const override;
Register
getExceptionSelectorRegister(const Constant *PersonalityFn) const override;
ISD::NodeType getExtendForAtomicOps() const override {
return ISD::SIGN_EXTEND;
}
Register getRegisterByName(const char *RegName, LLT VT,
const MachineFunction &MF) const override;
bool mayBeEmittedAsTailCall(const CallInst *CI) const override;
bool decomposeMulByConstant(LLVMContext &Context, EVT VT,
SDValue C) const override;
bool isUsedByReturnOnly(SDNode *N, SDValue &Chain) const override;
bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
unsigned AS,
Instruction *I = nullptr) const override;
bool isLegalICmpImmediate(int64_t Imm) const override;
bool isLegalAddImmediate(int64_t Imm) const override;
bool isZExtFree(SDValue Val, EVT VT2) const override;
bool isSExtCheaperThanZExt(EVT SrcVT, EVT DstVT) const override;
bool hasAndNotCompare(SDValue Y) const override;
bool convertSelectOfConstantsToMath(EVT VT) const override { return true; }
bool allowsMisalignedMemoryAccesses(
EVT VT, unsigned AddrSpace = 0, Align Alignment = Align(1),
MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
unsigned *Fast = nullptr) const override;
private:
/// Target-specific function used to lower LoongArch calling conventions.
typedef bool LoongArchCCAssignFn(const DataLayout &DL, LoongArchABI::ABI ABI,
unsigned ValNo, MVT ValVT,
CCValAssign::LocInfo LocInfo,
ISD::ArgFlagsTy ArgFlags, CCState &State,
bool IsFixed, bool IsReg, Type *OrigTy);
void analyzeInputArgs(MachineFunction &MF, CCState &CCInfo,
const SmallVectorImpl<ISD::InputArg> &Ins, bool IsRet,
LoongArchCCAssignFn Fn) const;
void analyzeOutputArgs(MachineFunction &MF, CCState &CCInfo,
const SmallVectorImpl<ISD::OutputArg> &Outs,
bool IsRet, CallLoweringInfo *CLI,
LoongArchCCAssignFn Fn) const;
template <class NodeTy>
SDValue getAddr(NodeTy *N, SelectionDAG &DAG, bool IsLocal = true) const;
SDValue getStaticTLSAddr(GlobalAddressSDNode *N, SelectionDAG &DAG,
unsigned Opc, bool Large = false) const;
SDValue getDynamicTLSAddr(GlobalAddressSDNode *N, SelectionDAG &DAG,
unsigned Opc, bool Large = false) const;
SDValue lowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerShiftRightParts(SDValue Op, SelectionDAG &DAG, bool IsSRA) const;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *BB) const override;
SDValue lowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerEH_DWARF_CFA(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerBITCAST(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerUINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerSINT_TO_FP(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerVASTART(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerINTRINSIC_W_CHAIN(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerINTRINSIC_VOID(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue lowerWRITE_REGISTER(SDValue Op, SelectionDAG &DAG) const;
bool isFPImmLegal(const APFloat &Imm, EVT VT,
bool ForCodeSize) const override;
bool shouldInsertFencesForAtomic(const Instruction *I) const override;
ConstraintType getConstraintType(StringRef Constraint) const override;
unsigned getInlineAsmMemConstraint(StringRef ConstraintCode) const override;
std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
StringRef Constraint, MVT VT) const override;
void LowerAsmOperandForConstraint(SDValue Op, std::string &Constraint,
std::vector<SDValue> &Ops,
SelectionDAG &DAG) const override;
bool isEligibleForTailCallOptimization(
CCState &CCInfo, CallLoweringInfo &CLI, MachineFunction &MF,
const SmallVectorImpl<CCValAssign> &ArgLocs) const;
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_LOONGARCH_LOONGARCHISELLOWERING_H
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