1 //===-- RISCVInstructionSelector.cpp -----------------------------*- 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 /// \file 9 /// This file implements the targeting of the InstructionSelector class for 10 /// RISCV. 11 /// \todo This should be generated by TableGen. 12 //===----------------------------------------------------------------------===// 13 14 #include "RISCVRegisterBankInfo.h" 15 #include "RISCVSubtarget.h" 16 #include "RISCVTargetMachine.h" 17 #include "llvm/CodeGen/GlobalISel/InstructionSelector.h" 18 #include "llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h" 19 #include "llvm/IR/IntrinsicsRISCV.h" 20 #include "llvm/Support/Debug.h" 21 22 #define DEBUG_TYPE "riscv-isel" 23 24 using namespace llvm; 25 26 #define GET_GLOBALISEL_PREDICATE_BITSET 27 #include "RISCVGenGlobalISel.inc" 28 #undef GET_GLOBALISEL_PREDICATE_BITSET 29 30 namespace { 31 32 class RISCVInstructionSelector : public InstructionSelector { 33 public: 34 RISCVInstructionSelector(const RISCVTargetMachine &TM, 35 const RISCVSubtarget &STI, 36 const RISCVRegisterBankInfo &RBI); 37 38 bool select(MachineInstr &I) override; 39 static const char *getName() { return DEBUG_TYPE; } 40 41 private: 42 bool selectImpl(MachineInstr &I, CodeGenCoverage &CoverageInfo) const; 43 44 const RISCVSubtarget &STI; 45 const RISCVInstrInfo &TII; 46 const RISCVRegisterInfo &TRI; 47 const RISCVRegisterBankInfo &RBI; 48 49 // FIXME: This is necessary because DAGISel uses "Subtarget->" and GlobalISel 50 // uses "STI." in the code generated by TableGen. We need to unify the name of 51 // Subtarget variable. 52 const RISCVSubtarget *Subtarget = &STI; 53 54 #define GET_GLOBALISEL_PREDICATES_DECL 55 #include "RISCVGenGlobalISel.inc" 56 #undef GET_GLOBALISEL_PREDICATES_DECL 57 58 #define GET_GLOBALISEL_TEMPORARIES_DECL 59 #include "RISCVGenGlobalISel.inc" 60 #undef GET_GLOBALISEL_TEMPORARIES_DECL 61 }; 62 63 } // end anonymous namespace 64 65 #define GET_GLOBALISEL_IMPL 66 #include "RISCVGenGlobalISel.inc" 67 #undef GET_GLOBALISEL_IMPL 68 69 RISCVInstructionSelector::RISCVInstructionSelector( 70 const RISCVTargetMachine &TM, const RISCVSubtarget &STI, 71 const RISCVRegisterBankInfo &RBI) 72 : STI(STI), TII(*STI.getInstrInfo()), TRI(*STI.getRegisterInfo()), RBI(RBI), 73 74 #define GET_GLOBALISEL_PREDICATES_INIT 75 #include "RISCVGenGlobalISel.inc" 76 #undef GET_GLOBALISEL_PREDICATES_INIT 77 #define GET_GLOBALISEL_TEMPORARIES_INIT 78 #include "RISCVGenGlobalISel.inc" 79 #undef GET_GLOBALISEL_TEMPORARIES_INIT 80 { 81 } 82 83 bool RISCVInstructionSelector::select(MachineInstr &I) { 84 85 if (!isPreISelGenericOpcode(I.getOpcode())) { 86 // Certain non-generic instructions also need some special handling. 87 return true; 88 } 89 90 if (selectImpl(I, *CoverageInfo)) 91 return true; 92 93 return false; 94 } 95 96 namespace llvm { 97 InstructionSelector * 98 createRISCVInstructionSelector(const RISCVTargetMachine &TM, 99 RISCVSubtarget &Subtarget, 100 RISCVRegisterBankInfo &RBI) { 101 return new RISCVInstructionSelector(TM, Subtarget, RBI); 102 } 103 } // end namespace llvm 104