1 //=== lib/CodeGen/GlobalISel/MipsPreLegalizerCombiner.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 "MipsTargetMachine.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/MIPatternMatch.h" 19 #include "llvm/CodeGen/TargetPassConfig.h" 20 21 #define DEBUG_TYPE "mips-prelegalizer-combiner" 22 23 using namespace llvm; 24 25 namespace { 26 class MipsPreLegalizerCombinerInfo : public CombinerInfo { 27 public: 28 MipsPreLegalizerCombinerInfo() 29 : CombinerInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false, 30 /*LegalizerInfo*/ nullptr) {} 31 virtual bool combine(GISelChangeObserver &Observer, MachineInstr &MI, 32 MachineIRBuilder &B) const override; 33 }; 34 35 bool MipsPreLegalizerCombinerInfo::combine(GISelChangeObserver &Observer, 36 MachineInstr &MI, 37 MachineIRBuilder &B) const { 38 CombinerHelper Helper(Observer, B); 39 40 switch (MI.getOpcode()) { 41 default: 42 return false; 43 case TargetOpcode::G_LOAD: 44 case TargetOpcode::G_SEXTLOAD: 45 case TargetOpcode::G_ZEXTLOAD: 46 return Helper.tryCombineExtendingLoads(MI); 47 } 48 return false; 49 } 50 51 // Pass boilerplate 52 // ================ 53 54 class MipsPreLegalizerCombiner : public MachineFunctionPass { 55 public: 56 static char ID; 57 58 MipsPreLegalizerCombiner(); 59 60 StringRef getPassName() const override { return "MipsPreLegalizerCombiner"; } 61 62 bool runOnMachineFunction(MachineFunction &MF) override; 63 64 void getAnalysisUsage(AnalysisUsage &AU) const override; 65 }; 66 } // end anonymous namespace 67 68 void MipsPreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const { 69 AU.addRequired<TargetPassConfig>(); 70 AU.setPreservesCFG(); 71 getSelectionDAGFallbackAnalysisUsage(AU); 72 MachineFunctionPass::getAnalysisUsage(AU); 73 } 74 75 MipsPreLegalizerCombiner::MipsPreLegalizerCombiner() : MachineFunctionPass(ID) { 76 initializeMipsPreLegalizerCombinerPass(*PassRegistry::getPassRegistry()); 77 } 78 79 bool MipsPreLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) { 80 if (MF.getProperties().hasProperty( 81 MachineFunctionProperties::Property::FailedISel)) 82 return false; 83 auto *TPC = &getAnalysis<TargetPassConfig>(); 84 MipsPreLegalizerCombinerInfo PCInfo; 85 Combiner C(PCInfo, TPC); 86 return C.combineMachineInstrs(MF, nullptr); 87 } 88 89 char MipsPreLegalizerCombiner::ID = 0; 90 INITIALIZE_PASS_BEGIN(MipsPreLegalizerCombiner, DEBUG_TYPE, 91 "Combine Mips machine instrs before legalization", false, 92 false) 93 INITIALIZE_PASS_DEPENDENCY(TargetPassConfig) 94 INITIALIZE_PASS_END(MipsPreLegalizerCombiner, DEBUG_TYPE, 95 "Combine Mips machine instrs before legalization", false, 96 false) 97 98 namespace llvm { 99 FunctionPass *createMipsPreLegalizeCombiner() { 100 return new MipsPreLegalizerCombiner(); 101 } 102 } // end namespace llvm 103