| //=== lib/CodeGen/GlobalISel/MipsPreLegalizerCombiner.cpp --------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This pass does combining of machine instructions at the generic MI level, |
| // before the legalizer. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "MipsTargetMachine.h" |
| #include "llvm/CodeGen/GlobalISel/Combiner.h" |
| #include "llvm/CodeGen/GlobalISel/CombinerHelper.h" |
| #include "llvm/CodeGen/GlobalISel/CombinerInfo.h" |
| #include "llvm/CodeGen/GlobalISel/MIPatternMatch.h" |
| #include "llvm/CodeGen/TargetPassConfig.h" |
| #include "llvm/InitializePasses.h" |
| |
| #define DEBUG_TYPE "mips-prelegalizer-combiner" |
| |
| using namespace llvm; |
| |
| namespace { |
| class MipsPreLegalizerCombinerInfo : public CombinerInfo { |
| public: |
| MipsPreLegalizerCombinerInfo() |
| : CombinerInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false, |
| /*LegalizerInfo*/ nullptr, /*EnableOpt*/ false, |
| /*EnableOptSize*/ false, /*EnableMinSize*/ false) {} |
| virtual bool combine(GISelChangeObserver &Observer, MachineInstr &MI, |
| MachineIRBuilder &B) const override; |
| }; |
| |
| bool MipsPreLegalizerCombinerInfo::combine(GISelChangeObserver &Observer, |
| MachineInstr &MI, |
| MachineIRBuilder &B) const { |
| CombinerHelper Helper(Observer, B); |
| |
| switch (MI.getOpcode()) { |
| default: |
| return false; |
| case TargetOpcode::G_MEMCPY_INLINE: |
| return Helper.tryEmitMemcpyInline(MI); |
| case TargetOpcode::G_LOAD: |
| case TargetOpcode::G_SEXTLOAD: |
| case TargetOpcode::G_ZEXTLOAD: { |
| // Don't attempt to combine non power of 2 loads or unaligned loads when |
| // subtarget doesn't support them. |
| auto MMO = *MI.memoperands_begin(); |
| const MipsSubtarget &STI = |
| static_cast<const MipsSubtarget &>(MI.getMF()->getSubtarget()); |
| if (!isPowerOf2_64(MMO->getSize())) |
| return false; |
| bool isUnaligned = MMO->getAlign() < MMO->getSize(); |
| if (!STI.systemSupportsUnalignedAccess() && isUnaligned) |
| return false; |
| |
| return Helper.tryCombineExtendingLoads(MI); |
| } |
| } |
| |
| return false; |
| } |
| |
| // Pass boilerplate |
| // ================ |
| |
| class MipsPreLegalizerCombiner : public MachineFunctionPass { |
| public: |
| static char ID; |
| |
| MipsPreLegalizerCombiner(); |
| |
| StringRef getPassName() const override { return "MipsPreLegalizerCombiner"; } |
| |
| bool runOnMachineFunction(MachineFunction &MF) override; |
| |
| void getAnalysisUsage(AnalysisUsage &AU) const override; |
| }; |
| } // end anonymous namespace |
| |
| void MipsPreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const { |
| AU.addRequired<TargetPassConfig>(); |
| AU.setPreservesCFG(); |
| getSelectionDAGFallbackAnalysisUsage(AU); |
| MachineFunctionPass::getAnalysisUsage(AU); |
| } |
| |
| MipsPreLegalizerCombiner::MipsPreLegalizerCombiner() : MachineFunctionPass(ID) { |
| initializeMipsPreLegalizerCombinerPass(*PassRegistry::getPassRegistry()); |
| } |
| |
| bool MipsPreLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) { |
| if (MF.getProperties().hasProperty( |
| MachineFunctionProperties::Property::FailedISel)) |
| return false; |
| auto *TPC = &getAnalysis<TargetPassConfig>(); |
| MipsPreLegalizerCombinerInfo PCInfo; |
| Combiner C(PCInfo, TPC); |
| return C.combineMachineInstrs(MF, nullptr); |
| } |
| |
| char MipsPreLegalizerCombiner::ID = 0; |
| INITIALIZE_PASS_BEGIN(MipsPreLegalizerCombiner, DEBUG_TYPE, |
| "Combine Mips machine instrs before legalization", false, |
| false) |
| INITIALIZE_PASS_DEPENDENCY(TargetPassConfig) |
| INITIALIZE_PASS_END(MipsPreLegalizerCombiner, DEBUG_TYPE, |
| "Combine Mips machine instrs before legalization", false, |
| false) |
| |
| namespace llvm { |
| FunctionPass *createMipsPreLegalizeCombiner() { |
| return new MipsPreLegalizerCombiner(); |
| } |
| } // end namespace llvm |