1 //===-- SPIRVISelLowering.h - SPIR-V DAG Lowering Interface -----*- C++ -*-===// 2 // 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 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines the interfaces that SPIR-V uses to lower LLVM code into a 10 // selection DAG. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_SPIRV_SPIRVISELLOWERING_H 15 #define LLVM_LIB_TARGET_SPIRV_SPIRVISELLOWERING_H 16 17 #include "SPIRVGlobalRegistry.h" 18 #include "llvm/CodeGen/TargetLowering.h" 19 #include <set> 20 21 namespace llvm { 22 class SPIRVSubtarget; 23 24 class SPIRVTargetLowering : public TargetLowering { 25 const SPIRVSubtarget &STI; 26 27 // Record of already processed machine functions 28 mutable std::set<const MachineFunction *> ProcessedMF; 29 30 public: 31 explicit SPIRVTargetLowering(const TargetMachine &TM, 32 const SPIRVSubtarget &ST) 33 : TargetLowering(TM), STI(ST) {} 34 35 // Stop IRTranslator breaking up FMA instrs to preserve types information. 36 bool isFMAFasterThanFMulAndFAdd(const MachineFunction &MF, 37 EVT) const override { 38 return true; 39 } 40 41 // prevent creation of jump tables 42 bool areJTsAllowed(const Function *) const override { return false; } 43 44 // This is to prevent sexts of non-i64 vector indices which are generated 45 // within general IRTranslator hence type generation for it is omitted. 46 MVT getVectorIdxTy(const DataLayout &DL) const override { 47 return MVT::getIntegerVT(32); 48 } 49 unsigned getNumRegistersForCallingConv(LLVMContext &Context, 50 CallingConv::ID CC, 51 EVT VT) const override; 52 MVT getRegisterTypeForCallingConv(LLVMContext &Context, CallingConv::ID CC, 53 EVT VT) const override; 54 bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I, 55 MachineFunction &MF, 56 unsigned Intrinsic) const override; 57 58 std::pair<unsigned, const TargetRegisterClass *> 59 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI, 60 StringRef Constraint, MVT VT) const override; 61 unsigned 62 getNumRegisters(LLVMContext &Context, EVT VT, 63 std::optional<MVT> RegisterVT = std::nullopt) const override { 64 return 1; 65 } 66 67 // Call the default implementation and finalize target lowering by inserting 68 // extra instructions required to preserve validity of SPIR-V code imposed by 69 // the standard. 70 void finalizeLowering(MachineFunction &MF) const override; 71 72 MVT getPreferredSwitchConditionType(LLVMContext &Context, 73 EVT ConditionVT) const override { 74 return ConditionVT.getSimpleVT(); 75 } 76 }; 77 } // namespace llvm 78 79 #endif // LLVM_LIB_TARGET_SPIRV_SPIRVISELLOWERING_H 80