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| 1 | +//=== RISCVPostLegalizerCombiner.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 | +/// |
| 9 | +/// \file |
| 10 | +/// Post-legalization combines on generic MachineInstrs. |
| 11 | +/// |
| 12 | +/// The combines here must preserve instruction legality. |
| 13 | +/// |
| 14 | +/// Combines which don't rely on instruction legality should go in the |
| 15 | +/// RISCVPreLegalizerCombiner. |
| 16 | +/// |
| 17 | +//===----------------------------------------------------------------------===// |
| 18 | + |
| 19 | +#include "RISCVTargetMachine.h" |
| 20 | +#include "llvm/CodeGen/GlobalISel/CSEInfo.h" |
| 21 | +#include "llvm/CodeGen/GlobalISel/Combiner.h" |
| 22 | +#include "llvm/CodeGen/GlobalISel/CombinerHelper.h" |
| 23 | +#include "llvm/CodeGen/GlobalISel/CombinerInfo.h" |
| 24 | +#include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h" |
| 25 | +#include "llvm/CodeGen/GlobalISel/GISelKnownBits.h" |
| 26 | +#include "llvm/CodeGen/GlobalISel/GenericMachineInstrs.h" |
| 27 | +#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h" |
| 28 | +#include "llvm/CodeGen/MachineDominators.h" |
| 29 | +#include "llvm/CodeGen/MachineFunctionPass.h" |
| 30 | +#include "llvm/CodeGen/MachineRegisterInfo.h" |
| 31 | +#include "llvm/CodeGen/TargetPassConfig.h" |
| 32 | + |
| 33 | +#define GET_GICOMBINER_DEPS |
| 34 | +#include "RISCVGenPostLegalizeGICombiner.inc" |
| 35 | +#undef GET_GICOMBINER_DEPS |
| 36 | + |
| 37 | +#define DEBUG_TYPE "riscv-postlegalizer-combiner" |
| 38 | + |
| 39 | +using namespace llvm; |
| 40 | + |
| 41 | +namespace { |
| 42 | + |
| 43 | +#define GET_GICOMBINER_TYPES |
| 44 | +#include "RISCVGenPostLegalizeGICombiner.inc" |
| 45 | +#undef GET_GICOMBINER_TYPES |
| 46 | + |
| 47 | +class RISCVPostLegalizerCombinerImpl : public Combiner { |
| 48 | +protected: |
| 49 | + // TODO: Make CombinerHelper methods const. |
| 50 | + mutable CombinerHelper Helper; |
| 51 | + const RISCVPostLegalizerCombinerImplRuleConfig &RuleConfig; |
| 52 | + const RISCVSubtarget &STI; |
| 53 | + |
| 54 | +public: |
| 55 | + RISCVPostLegalizerCombinerImpl( |
| 56 | + MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC, |
| 57 | + GISelKnownBits &KB, GISelCSEInfo *CSEInfo, |
| 58 | + const RISCVPostLegalizerCombinerImplRuleConfig &RuleConfig, |
| 59 | + const RISCVSubtarget &STI, MachineDominatorTree *MDT, |
| 60 | + const LegalizerInfo *LI); |
| 61 | + |
| 62 | + static const char *getName() { return "RISCVPostLegalizerCombiner"; } |
| 63 | + |
| 64 | + bool tryCombineAll(MachineInstr &I) const override; |
| 65 | + |
| 66 | +private: |
| 67 | +#define GET_GICOMBINER_CLASS_MEMBERS |
| 68 | +#include "RISCVGenPostLegalizeGICombiner.inc" |
| 69 | +#undef GET_GICOMBINER_CLASS_MEMBERS |
| 70 | +}; |
| 71 | + |
| 72 | +#define GET_GICOMBINER_IMPL |
| 73 | +#include "RISCVGenPostLegalizeGICombiner.inc" |
| 74 | +#undef GET_GICOMBINER_IMPL |
| 75 | + |
| 76 | +RISCVPostLegalizerCombinerImpl::RISCVPostLegalizerCombinerImpl( |
| 77 | + MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC, |
| 78 | + GISelKnownBits &KB, GISelCSEInfo *CSEInfo, |
| 79 | + const RISCVPostLegalizerCombinerImplRuleConfig &RuleConfig, |
| 80 | + const RISCVSubtarget &STI, MachineDominatorTree *MDT, |
| 81 | + const LegalizerInfo *LI) |
| 82 | + : Combiner(MF, CInfo, TPC, &KB, CSEInfo), |
| 83 | + Helper(Observer, B, /*IsPreLegalize*/ false, &KB, MDT, LI), |
| 84 | + RuleConfig(RuleConfig), STI(STI), |
| 85 | +#define GET_GICOMBINER_CONSTRUCTOR_INITS |
| 86 | +#include "RISCVGenPostLegalizeGICombiner.inc" |
| 87 | +#undef GET_GICOMBINER_CONSTRUCTOR_INITS |
| 88 | +{ |
| 89 | +} |
| 90 | + |
| 91 | +class RISCVPostLegalizerCombiner : public MachineFunctionPass { |
| 92 | +public: |
| 93 | + static char ID; |
| 94 | + |
| 95 | + RISCVPostLegalizerCombiner(); |
| 96 | + |
| 97 | + StringRef getPassName() const override { |
| 98 | + return "RISCVPostLegalizerCombiner"; |
| 99 | + } |
| 100 | + |
| 101 | + bool runOnMachineFunction(MachineFunction &MF) override; |
| 102 | + void getAnalysisUsage(AnalysisUsage &AU) const override; |
| 103 | + |
| 104 | +private: |
| 105 | + RISCVPostLegalizerCombinerImplRuleConfig RuleConfig; |
| 106 | +}; |
| 107 | +} // end anonymous namespace |
| 108 | + |
| 109 | +void RISCVPostLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const { |
| 110 | + AU.addRequired<TargetPassConfig>(); |
| 111 | + AU.setPreservesCFG(); |
| 112 | + getSelectionDAGFallbackAnalysisUsage(AU); |
| 113 | + AU.addRequired<GISelKnownBitsAnalysis>(); |
| 114 | + AU.addPreserved<GISelKnownBitsAnalysis>(); |
| 115 | + AU.addRequired<MachineDominatorTree>(); |
| 116 | + AU.addPreserved<MachineDominatorTree>(); |
| 117 | + AU.addRequired<GISelCSEAnalysisWrapperPass>(); |
| 118 | + AU.addPreserved<GISelCSEAnalysisWrapperPass>(); |
| 119 | + MachineFunctionPass::getAnalysisUsage(AU); |
| 120 | +} |
| 121 | + |
| 122 | +RISCVPostLegalizerCombiner::RISCVPostLegalizerCombiner() |
| 123 | + : MachineFunctionPass(ID) { |
| 124 | + initializeRISCVPostLegalizerCombinerPass(*PassRegistry::getPassRegistry()); |
| 125 | + |
| 126 | + if (!RuleConfig.parseCommandLineOption()) |
| 127 | + report_fatal_error("Invalid rule identifier"); |
| 128 | +} |
| 129 | + |
| 130 | +bool RISCVPostLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) { |
| 131 | + if (MF.getProperties().hasProperty( |
| 132 | + MachineFunctionProperties::Property::FailedISel)) |
| 133 | + return false; |
| 134 | + assert(MF.getProperties().hasProperty( |
| 135 | + MachineFunctionProperties::Property::Legalized) && |
| 136 | + "Expected a legalized function?"); |
| 137 | + auto *TPC = &getAnalysis<TargetPassConfig>(); |
| 138 | + const Function &F = MF.getFunction(); |
| 139 | + bool EnableOpt = |
| 140 | + MF.getTarget().getOptLevel() != CodeGenOptLevel::None && !skipFunction(F); |
| 141 | + |
| 142 | + const RISCVSubtarget &ST = MF.getSubtarget<RISCVSubtarget>(); |
| 143 | + const auto *LI = ST.getLegalizerInfo(); |
| 144 | + |
| 145 | + GISelKnownBits *KB = &getAnalysis<GISelKnownBitsAnalysis>().get(MF); |
| 146 | + MachineDominatorTree *MDT = &getAnalysis<MachineDominatorTree>(); |
| 147 | + GISelCSEAnalysisWrapper &Wrapper = |
| 148 | + getAnalysis<GISelCSEAnalysisWrapperPass>().getCSEWrapper(); |
| 149 | + auto *CSEInfo = &Wrapper.get(TPC->getCSEConfig()); |
| 150 | + |
| 151 | + CombinerInfo CInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false, |
| 152 | + /*LegalizerInfo*/ nullptr, EnableOpt, F.hasOptSize(), |
| 153 | + F.hasMinSize()); |
| 154 | + RISCVPostLegalizerCombinerImpl Impl(MF, CInfo, TPC, *KB, CSEInfo, |
| 155 | + RuleConfig, ST, MDT, LI); |
| 156 | + return Impl.combineMachineInstrs(); |
| 157 | +} |
| 158 | + |
| 159 | +char RISCVPostLegalizerCombiner::ID = 0; |
| 160 | +INITIALIZE_PASS_BEGIN(RISCVPostLegalizerCombiner, DEBUG_TYPE, |
| 161 | + "Combine RISC-V MachineInstrs after legalization", false, |
| 162 | + false) |
| 163 | +INITIALIZE_PASS_DEPENDENCY(TargetPassConfig) |
| 164 | +INITIALIZE_PASS_DEPENDENCY(GISelKnownBitsAnalysis) |
| 165 | +INITIALIZE_PASS_END(RISCVPostLegalizerCombiner, DEBUG_TYPE, |
| 166 | + "Combine RISC-V MachineInstrs after legalization", false, |
| 167 | + false) |
| 168 | + |
| 169 | +namespace llvm { |
| 170 | +FunctionPass *createRISCVPostLegalizerCombiner() { |
| 171 | + return new RISCVPostLegalizerCombiner(); |
| 172 | +} |
| 173 | +} // end namespace llvm |
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