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//- WebAssemblyISelLowering.h - WebAssembly 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file defines the interfaces that WebAssembly uses to lower LLVM
/// code into a selection DAG.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYISELLOWERING_H
#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYISELLOWERING_H
#include "llvm/CodeGen/TargetLowering.h"
namespace llvm {
namespace WebAssemblyISD {
enum NodeType : unsigned {
FIRST_NUMBER = ISD::BUILTIN_OP_END,
#define HANDLE_NODETYPE(NODE) NODE,
#define HANDLE_MEM_NODETYPE(NODE)
#include "WebAssemblyISD.def"
FIRST_MEM_OPCODE = ISD::FIRST_TARGET_MEMORY_OPCODE,
#undef HANDLE_NODETYPE
#undef HANDLE_MEM_NODETYPE
#define HANDLE_NODETYPE(NODE)
#define HANDLE_MEM_NODETYPE(NODE) NODE,
#include "WebAssemblyISD.def"
#undef HANDLE_NODETYPE
#undef HANDLE_MEM_NODETYPE
};
} // end namespace WebAssemblyISD
class WebAssemblySubtarget;
class WebAssemblyTargetLowering final : public TargetLowering {
public:
WebAssemblyTargetLowering(const TargetMachine &TM,
const WebAssemblySubtarget &STI);
MVT getPointerTy(const DataLayout &DL, uint32_t AS = 0) const override;
MVT getPointerMemTy(const DataLayout &DL, uint32_t AS = 0) const override;
private:
/// Keep a pointer to the WebAssemblySubtarget around so that we can make the
/// right decision when generating code for different targets.
const WebAssemblySubtarget *Subtarget;
AtomicExpansionKind shouldExpandAtomicRMWInIR(AtomicRMWInst *) const override;
bool shouldScalarizeBinop(SDValue VecOp) const override;
FastISel *createFastISel(FunctionLoweringInfo &FuncInfo,
const TargetLibraryInfo *LibInfo) const override;
MVT getScalarShiftAmountTy(const DataLayout &DL, EVT) const override;
MachineBasicBlock *
EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *MBB) const override;
const char *getTargetNodeName(unsigned Opcode) const override;
std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
StringRef Constraint, MVT VT) const override;
bool isCheapToSpeculateCttz() const override;
bool isCheapToSpeculateCtlz() const override;
bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
unsigned AS,
Instruction *I = nullptr) const override;
bool allowsMisalignedMemoryAccesses(EVT, unsigned AddrSpace, Align Alignment,
MachineMemOperand::Flags Flags,
bool *Fast) const override;
bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
bool isVectorLoadExtDesirable(SDValue ExtVal) const override;
bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
EVT VT) const override;
bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I,
MachineFunction &MF,
unsigned Intrinsic) const override;
void computeKnownBitsForTargetNode(const SDValue Op, KnownBits &Known,
const APInt &DemandedElts,
const SelectionDAG &DAG,
unsigned Depth) const override;
TargetLoweringBase::LegalizeTypeAction
getPreferredVectorAction(MVT VT) const override;
SDValue LowerCall(CallLoweringInfo &CLI,
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 LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
bool IsVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
const SDLoc &DL, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals) const override;
void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) const override;
const char *getClearCacheBuiltinName() const override {
report_fatal_error("llvm.clear_cache is not supported on wasm");
}
// Custom lowering hooks.
SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
SDValue LowerFrameIndex(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerCopyToReg(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerIntrinsic(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSIGN_EXTEND_INREG(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerAccessVectorElement(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerShift(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerFP_TO_INT_SAT(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerLoad(SDValue Op, SelectionDAG &DAG) const;
SDValue LowerStore(SDValue Op, SelectionDAG &DAG) const;
// Helper for LoadLoad and LowerStore
bool MatchTableForLowering(SelectionDAG &DAG, const SDLoc &DL,
const SDValue &Base, GlobalAddressSDNode *&GA,
SDValue &Idx) const;
// Custom DAG combine hooks
SDValue
PerformDAGCombine(SDNode *N,
TargetLowering::DAGCombinerInfo &DCI) const override;
};
namespace WebAssembly {
FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo);
} // end namespace WebAssembly
} // end namespace llvm
#endif
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