1 //=== RISCVO0PreLegalizerCombiner.cpp -------------------------------------===// 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 pass does combining of machine instructions at the generic MI level, 10 // before the legalizer. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "RISCVSubtarget.h" 15 #include "llvm/CodeGen/GlobalISel/Combiner.h" 16 #include "llvm/CodeGen/GlobalISel/CombinerHelper.h" 17 #include "llvm/CodeGen/GlobalISel/CombinerInfo.h" 18 #include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h" 19 #include "llvm/CodeGen/GlobalISel/GISelKnownBits.h" 20 #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h" 21 #include "llvm/CodeGen/MachineDominators.h" 22 #include "llvm/CodeGen/MachineFunction.h" 23 #include "llvm/CodeGen/MachineFunctionPass.h" 24 #include "llvm/CodeGen/MachineRegisterInfo.h" 25 #include "llvm/CodeGen/TargetPassConfig.h" 26 27 #define GET_GICOMBINER_DEPS 28 #include "RISCVGenO0PreLegalizeGICombiner.inc" 29 #undef GET_GICOMBINER_DEPS 30 31 #define DEBUG_TYPE "riscv-O0-prelegalizer-combiner" 32 33 using namespace llvm; 34 35 namespace { 36 #define GET_GICOMBINER_TYPES 37 #include "RISCVGenO0PreLegalizeGICombiner.inc" 38 #undef GET_GICOMBINER_TYPES 39 40 class RISCVO0PreLegalizerCombinerImpl : public Combiner { 41 protected: 42 // TODO: Make CombinerHelper methods const. 43 mutable CombinerHelper Helper; 44 const RISCVO0PreLegalizerCombinerImplRuleConfig &RuleConfig; 45 const RISCVSubtarget &STI; 46 47 public: 48 RISCVO0PreLegalizerCombinerImpl( 49 MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC, 50 GISelKnownBits &KB, GISelCSEInfo *CSEInfo, 51 const RISCVO0PreLegalizerCombinerImplRuleConfig &RuleConfig, 52 const RISCVSubtarget &STI); 53 54 static const char *getName() { return "RISCVO0PreLegalizerCombiner"; } 55 56 bool tryCombineAll(MachineInstr &I) const override; 57 58 private: 59 #define GET_GICOMBINER_CLASS_MEMBERS 60 #include "RISCVGenO0PreLegalizeGICombiner.inc" 61 #undef GET_GICOMBINER_CLASS_MEMBERS 62 }; 63 64 #define GET_GICOMBINER_IMPL 65 #include "RISCVGenO0PreLegalizeGICombiner.inc" 66 #undef GET_GICOMBINER_IMPL 67 68 RISCVO0PreLegalizerCombinerImpl::RISCVO0PreLegalizerCombinerImpl( 69 MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC, 70 GISelKnownBits &KB, GISelCSEInfo *CSEInfo, 71 const RISCVO0PreLegalizerCombinerImplRuleConfig &RuleConfig, 72 const RISCVSubtarget &STI) 73 : Combiner(MF, CInfo, TPC, &KB, CSEInfo), 74 Helper(Observer, B, /*IsPreLegalize*/ true, &KB), RuleConfig(RuleConfig), 75 STI(STI), 76 #define GET_GICOMBINER_CONSTRUCTOR_INITS 77 #include "RISCVGenO0PreLegalizeGICombiner.inc" 78 #undef GET_GICOMBINER_CONSTRUCTOR_INITS 79 { 80 } 81 82 // Pass boilerplate 83 // ================ 84 85 class RISCVO0PreLegalizerCombiner : public MachineFunctionPass { 86 public: 87 static char ID; 88 89 RISCVO0PreLegalizerCombiner(); 90 91 StringRef getPassName() const override { 92 return "RISCVO0PreLegalizerCombiner"; 93 } 94 95 bool runOnMachineFunction(MachineFunction &MF) override; 96 97 void getAnalysisUsage(AnalysisUsage &AU) const override; 98 99 private: 100 RISCVO0PreLegalizerCombinerImplRuleConfig RuleConfig; 101 }; 102 } // end anonymous namespace 103 104 void RISCVO0PreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const { 105 AU.addRequired<TargetPassConfig>(); 106 AU.setPreservesCFG(); 107 getSelectionDAGFallbackAnalysisUsage(AU); 108 AU.addRequired<GISelKnownBitsAnalysis>(); 109 AU.addPreserved<GISelKnownBitsAnalysis>(); 110 MachineFunctionPass::getAnalysisUsage(AU); 111 } 112 113 RISCVO0PreLegalizerCombiner::RISCVO0PreLegalizerCombiner() 114 : MachineFunctionPass(ID) { 115 initializeRISCVO0PreLegalizerCombinerPass(*PassRegistry::getPassRegistry()); 116 117 if (!RuleConfig.parseCommandLineOption()) 118 report_fatal_error("Invalid rule identifier"); 119 } 120 121 bool RISCVO0PreLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) { 122 if (MF.getProperties().hasProperty( 123 MachineFunctionProperties::Property::FailedISel)) 124 return false; 125 auto &TPC = getAnalysis<TargetPassConfig>(); 126 127 const Function &F = MF.getFunction(); 128 GISelKnownBits *KB = &getAnalysis<GISelKnownBitsAnalysis>().get(MF); 129 130 const RISCVSubtarget &ST = MF.getSubtarget<RISCVSubtarget>(); 131 132 CombinerInfo CInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false, 133 /*LegalizerInfo*/ nullptr, /*EnableOpt*/ false, 134 F.hasOptSize(), F.hasMinSize()); 135 RISCVO0PreLegalizerCombinerImpl Impl(MF, CInfo, &TPC, *KB, 136 /*CSEInfo*/ nullptr, RuleConfig, ST); 137 return Impl.combineMachineInstrs(); 138 } 139 140 char RISCVO0PreLegalizerCombiner::ID = 0; 141 INITIALIZE_PASS_BEGIN(RISCVO0PreLegalizerCombiner, DEBUG_TYPE, 142 "Combine RISC-V machine instrs before legalization", false, 143 false) 144 INITIALIZE_PASS_DEPENDENCY(TargetPassConfig) 145 INITIALIZE_PASS_DEPENDENCY(GISelKnownBitsAnalysis) 146 INITIALIZE_PASS_DEPENDENCY(GISelCSEAnalysisWrapperPass) 147 INITIALIZE_PASS_END(RISCVO0PreLegalizerCombiner, DEBUG_TYPE, 148 "Combine RISC-V machine instrs before legalization", false, 149 false) 150 151 namespace llvm { 152 FunctionPass *createRISCVO0PreLegalizerCombiner() { 153 return new RISCVO0PreLegalizerCombiner(); 154 } 155 } // end namespace llvm 156