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;
43 class WebAssemblyTargetLowering final : public TargetLowering {
45 WebAssemblyTargetLowering(const TargetMachine &TM,
46 const WebAssemblySubtarget &STI);
49 /// Keep a pointer to the WebAssemblySubtarget around so that we can make the
50 /// right decision when generating code for different targets.
51 const WebAssemblySubtarget *Subtarget;
53 AtomicExpansionKind shouldExpandAtomicRMWInIR(AtomicRMWInst *) const override;
54 FastISel *createFastISel(FunctionLoweringInfo &FuncInfo,
55 const TargetLibraryInfo *LibInfo) const override;
56 MVT getScalarShiftAmountTy(const DataLayout &DL, EVT) const override;
58 EmitInstrWithCustomInserter(MachineInstr &MI,
59 MachineBasicBlock *MBB) const override;
60 const char *getTargetNodeName(unsigned Opcode) const override;
61 std::pair<unsigned, const TargetRegisterClass *>
62 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
63 StringRef Constraint, MVT VT) const override;
64 bool isCheapToSpeculateCttz() const override;
65 bool isCheapToSpeculateCtlz() const override;
66 bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
68 Instruction *I = nullptr) const override;
69 bool allowsMisalignedMemoryAccesses(EVT, unsigned AddrSpace, unsigned Align,
70 MachineMemOperand::Flags Flags,
71 bool *Fast) const override;
72 bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
73 bool isVectorLoadExtDesirable(SDValue ExtVal) const override;
74 EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
75 EVT VT) const override;
76 bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I,
78 unsigned Intrinsic) const override;
80 SDValue LowerCall(CallLoweringInfo &CLI,
81 SmallVectorImpl<SDValue> &InVals) const override;
82 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
84 const SmallVectorImpl<ISD::OutputArg> &Outs,
85 LLVMContext &Context) const override;
86 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
87 const SmallVectorImpl<ISD::OutputArg> &Outs,
88 const SmallVectorImpl<SDValue> &OutVals, const SDLoc &dl,
89 SelectionDAG &DAG) const override;
90 SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
92 const SmallVectorImpl<ISD::InputArg> &Ins,
93 const SDLoc &DL, SelectionDAG &DAG,
94 SmallVectorImpl<SDValue> &InVals) const override;
96 void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue> &Results,
97 SelectionDAG &DAG) const override;
99 const char *getClearCacheBuiltinName() const override {
100 report_fatal_error("llvm.clear_cache is not supported on wasm");
103 // Custom lowering hooks.
104 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
105 SDValue LowerFrameIndex(SDValue Op, SelectionDAG &DAG) const;
106 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
107 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
108 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
109 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
110 SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
111 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
112 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
113 SDValue LowerCopyToReg(SDValue Op, SelectionDAG &DAG) const;
114 SDValue LowerIntrinsic(SDValue Op, SelectionDAG &DAG) const;
115 SDValue LowerSIGN_EXTEND_INREG(SDValue Op, SelectionDAG &DAG) const;
116 SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const;
117 SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const;
118 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
119 SDValue LowerAccessVectorElement(SDValue Op, SelectionDAG &DAG) const;
120 SDValue LowerShift(SDValue Op, SelectionDAG &DAG) const;
122 // Custom DAG combine hooks
124 PerformDAGCombine(SDNode *N,
125 TargetLowering::DAGCombinerInfo &DCI) const override;
128 namespace WebAssembly {
129 FastISel *createFastISel(FunctionLoweringInfo &funcInfo,
130 const TargetLibraryInfo *libInfo);
131 } // end namespace WebAssembly
133 } // end namespace llvm