1 //- WebAssemblyISelLowering.h - WebAssembly DAG Lowering Interface -*- C++ -*-//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 /// This file defines the interfaces that WebAssembly uses to lower LLVM
11 /// code into a selection DAG.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYISELLOWERING_H
16 #define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYISELLOWERING_H
18 #include "llvm/CodeGen/TargetLowering.h"
22 namespace WebAssemblyISD {
24 enum NodeType : unsigned {
25 FIRST_NUMBER = ISD::BUILTIN_OP_END,
26 #define HANDLE_NODETYPE(NODE) NODE,
27 #define HANDLE_MEM_NODETYPE(NODE)
28 #include "WebAssemblyISD.def"
29 FIRST_MEM_OPCODE = ISD::FIRST_TARGET_MEMORY_OPCODE,
30 #undef HANDLE_NODETYPE
31 #undef HANDLE_MEM_NODETYPE
32 #define HANDLE_NODETYPE(NODE)
33 #define HANDLE_MEM_NODETYPE(NODE) NODE,
34 #include "WebAssemblyISD.def"
35 #undef HANDLE_NODETYPE
36 #undef HANDLE_MEM_NODETYPE
39 } // end namespace WebAssemblyISD
41 class WebAssemblySubtarget;
42 class WebAssemblyTargetMachine;
44 class WebAssemblyTargetLowering final : public TargetLowering {
46 WebAssemblyTargetLowering(const TargetMachine &TM,
47 const WebAssemblySubtarget &STI);
50 /// Keep a pointer to the WebAssemblySubtarget around so that we can make the
51 /// right decision when generating code for different targets.
52 const WebAssemblySubtarget *Subtarget;
54 AtomicExpansionKind shouldExpandAtomicRMWInIR(AtomicRMWInst *) const override;
55 FastISel *createFastISel(FunctionLoweringInfo &FuncInfo,
56 const TargetLibraryInfo *LibInfo) const override;
57 MVT getScalarShiftAmountTy(const DataLayout &DL, EVT) const override;
59 EmitInstrWithCustomInserter(MachineInstr &MI,
60 MachineBasicBlock *MBB) const override;
61 const char *getTargetNodeName(unsigned Opcode) const override;
62 std::pair<unsigned, const TargetRegisterClass *>
63 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
64 StringRef Constraint, MVT VT) const override;
65 bool isCheapToSpeculateCttz() const override;
66 bool isCheapToSpeculateCtlz() const override;
67 bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
69 Instruction *I = nullptr) const override;
70 bool allowsMisalignedMemoryAccesses(EVT, unsigned AddrSpace, unsigned Align,
71 MachineMemOperand::Flags Flags,
72 bool *Fast) const override;
73 bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
74 bool isVectorLoadExtDesirable(SDValue ExtVal) const override;
75 EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
76 EVT VT) const override;
77 bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I,
79 unsigned Intrinsic) const override;
81 SDValue LowerCall(CallLoweringInfo &CLI,
82 SmallVectorImpl<SDValue> &InVals) const override;
83 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
85 const SmallVectorImpl<ISD::OutputArg> &Outs,
86 LLVMContext &Context) const override;
87 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
88 const SmallVectorImpl<ISD::OutputArg> &Outs,
89 const SmallVectorImpl<SDValue> &OutVals, const SDLoc &dl,
90 SelectionDAG &DAG) const override;
91 SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
93 const SmallVectorImpl<ISD::InputArg> &Ins,
94 const SDLoc &DL, SelectionDAG &DAG,
95 SmallVectorImpl<SDValue> &InVals) const override;
97 void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue> &Results,
98 SelectionDAG &DAG) const override;
100 const char *getClearCacheBuiltinName() const override {
101 report_fatal_error("llvm.clear_cache is not supported on wasm");
104 // Custom lowering hooks.
105 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
106 SDValue LowerFrameIndex(SDValue Op, SelectionDAG &DAG) const;
107 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
108 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
109 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
110 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
111 SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
112 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
113 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
114 SDValue LowerCopyToReg(SDValue Op, SelectionDAG &DAG) const;
115 SDValue LowerIntrinsic(SDValue Op, SelectionDAG &DAG) const;
116 SDValue LowerSIGN_EXTEND_INREG(SDValue Op, SelectionDAG &DAG) const;
117 SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
118 SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
119 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
120 SDValue LowerAccessVectorElement(SDValue Op, SelectionDAG &DAG) const;
121 SDValue LowerShift(SDValue Op, SelectionDAG &DAG) const;
124 namespace WebAssembly {
125 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
126 const TargetLibraryInfo *libInfo);
127 } // end namespace WebAssembly
129 } // end namespace llvm