1 //=== lib/CodeGen/GlobalISel/MipsPostLegalizerCombiner.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 // after the legalizer. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "MCTargetDesc/MipsMCTargetDesc.h" 15 #include "Mips.h" 16 #include "MipsLegalizerInfo.h" 17 #include "MipsSubtarget.h" 18 #include "llvm/CodeGen/GlobalISel/Combiner.h" 19 #include "llvm/CodeGen/GlobalISel/CombinerHelper.h" 20 #include "llvm/CodeGen/GlobalISel/CombinerInfo.h" 21 #include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h" 22 #include "llvm/CodeGen/GlobalISel/GISelKnownBits.h" 23 #include "llvm/CodeGen/GlobalISel/MIPatternMatch.h" 24 #include "llvm/CodeGen/MachineDominators.h" 25 #include "llvm/CodeGen/TargetPassConfig.h" 26 #include "llvm/Target/TargetMachine.h" 27 28 #define GET_GICOMBINER_DEPS 29 #include "MipsGenPostLegalizeGICombiner.inc" 30 #undef GET_GICOMBINER_DEPS 31 32 #define DEBUG_TYPE "mips-postlegalizer-combiner" 33 34 using namespace llvm; 35 using namespace MIPatternMatch; 36 37 namespace { 38 #define GET_GICOMBINER_TYPES 39 #include "MipsGenPostLegalizeGICombiner.inc" 40 #undef GET_GICOMBINER_TYPES 41 42 class MipsPostLegalizerCombinerImpl : public Combiner { 43 protected: 44 const MipsPostLegalizerCombinerImplRuleConfig &RuleConfig; 45 const MipsSubtarget &STI; 46 // TODO: Make CombinerHelper methods const. 47 mutable CombinerHelper Helper; 48 49 public: 50 MipsPostLegalizerCombinerImpl( 51 MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC, 52 GISelKnownBits &KB, GISelCSEInfo *CSEInfo, 53 const MipsPostLegalizerCombinerImplRuleConfig &RuleConfig, 54 const MipsSubtarget &STI, MachineDominatorTree *MDT, 55 const LegalizerInfo *LI); 56 57 static const char *getName() { return "MipsPostLegalizerCombiner"; } 58 59 bool tryCombineAll(MachineInstr &I) const override; 60 61 private: 62 #define GET_GICOMBINER_CLASS_MEMBERS 63 #include "MipsGenPostLegalizeGICombiner.inc" 64 #undef GET_GICOMBINER_CLASS_MEMBERS 65 }; 66 67 #define GET_GICOMBINER_IMPL 68 #include "MipsGenPostLegalizeGICombiner.inc" 69 #undef GET_GICOMBINER_IMPL 70 71 MipsPostLegalizerCombinerImpl::MipsPostLegalizerCombinerImpl( 72 MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC, 73 GISelKnownBits &KB, GISelCSEInfo *CSEInfo, 74 const MipsPostLegalizerCombinerImplRuleConfig &RuleConfig, 75 const MipsSubtarget &STI, MachineDominatorTree *MDT, 76 const LegalizerInfo *LI) 77 : Combiner(MF, CInfo, TPC, &KB, CSEInfo), RuleConfig(RuleConfig), STI(STI), 78 Helper(Observer, B, /*IsPreLegalize*/ false, &KB, MDT, LI), 79 #define GET_GICOMBINER_CONSTRUCTOR_INITS 80 #include "MipsGenPostLegalizeGICombiner.inc" 81 #undef GET_GICOMBINER_CONSTRUCTOR_INITS 82 { 83 } 84 85 // Pass boilerplate 86 // ================ 87 88 class MipsPostLegalizerCombiner : public MachineFunctionPass { 89 public: 90 static char ID; 91 92 MipsPostLegalizerCombiner(bool IsOptNone = false); 93 94 StringRef getPassName() const override { return "MipsPostLegalizerCombiner"; } 95 96 bool runOnMachineFunction(MachineFunction &MF) override; 97 98 void getAnalysisUsage(AnalysisUsage &AU) const override; 99 100 private: 101 bool IsOptNone; 102 MipsPostLegalizerCombinerImplRuleConfig RuleConfig; 103 }; 104 } // end anonymous namespace 105 106 void MipsPostLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const { 107 AU.addRequired<TargetPassConfig>(); 108 AU.setPreservesCFG(); 109 getSelectionDAGFallbackAnalysisUsage(AU); 110 AU.addRequired<GISelKnownBitsAnalysis>(); 111 AU.addPreserved<GISelKnownBitsAnalysis>(); 112 if (!IsOptNone) { 113 AU.addRequired<MachineDominatorTreeWrapperPass>(); 114 AU.addPreserved<MachineDominatorTreeWrapperPass>(); 115 } 116 MachineFunctionPass::getAnalysisUsage(AU); 117 } 118 119 MipsPostLegalizerCombiner::MipsPostLegalizerCombiner(bool IsOptNone) 120 : MachineFunctionPass(ID), IsOptNone(IsOptNone) { 121 initializeMipsPostLegalizerCombinerPass(*PassRegistry::getPassRegistry()); 122 123 if (!RuleConfig.parseCommandLineOption()) 124 report_fatal_error("Invalid rule identifier"); 125 } 126 127 bool MipsPostLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) { 128 if (MF.getProperties().hasProperty( 129 MachineFunctionProperties::Property::FailedISel)) 130 return false; 131 auto *TPC = &getAnalysis<TargetPassConfig>(); 132 const Function &F = MF.getFunction(); 133 bool EnableOpt = 134 MF.getTarget().getOptLevel() != CodeGenOptLevel::None && !skipFunction(F); 135 136 const MipsSubtarget &ST = MF.getSubtarget<MipsSubtarget>(); 137 const MipsLegalizerInfo *LI = 138 static_cast<const MipsLegalizerInfo *>(ST.getLegalizerInfo()); 139 140 GISelKnownBits *KB = &getAnalysis<GISelKnownBitsAnalysis>().get(MF); 141 MachineDominatorTree *MDT = 142 IsOptNone ? nullptr 143 : &getAnalysis<MachineDominatorTreeWrapperPass>().getDomTree(); 144 CombinerInfo CInfo(/*AllowIllegalOps*/ false, /*ShouldLegalizeIllegal*/ true, 145 LI, EnableOpt, F.hasOptSize(), F.hasMinSize()); 146 MipsPostLegalizerCombinerImpl Impl(MF, CInfo, TPC, *KB, /*CSEInfo*/ nullptr, 147 RuleConfig, ST, MDT, LI); 148 return Impl.combineMachineInstrs(); 149 } 150 151 char MipsPostLegalizerCombiner::ID = 0; 152 INITIALIZE_PASS_BEGIN(MipsPostLegalizerCombiner, DEBUG_TYPE, 153 "Combine Mips machine instrs after legalization", false, 154 false) 155 INITIALIZE_PASS_DEPENDENCY(TargetPassConfig) 156 INITIALIZE_PASS_DEPENDENCY(GISelKnownBitsAnalysis) 157 INITIALIZE_PASS_END(MipsPostLegalizerCombiner, DEBUG_TYPE, 158 "Combine Mips machine instrs after legalization", false, 159 false) 160 161 namespace llvm { 162 FunctionPass *createMipsPostLegalizeCombiner(bool IsOptNone) { 163 return new MipsPostLegalizerCombiner(IsOptNone); 164 } 165 } // end namespace llvm 166