diff options
Diffstat (limited to 'contrib/llvm/lib/Target/Mips/MipsPreLegalizerCombiner.cpp')
-rw-r--r-- | contrib/llvm/lib/Target/Mips/MipsPreLegalizerCombiner.cpp | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/Mips/MipsPreLegalizerCombiner.cpp b/contrib/llvm/lib/Target/Mips/MipsPreLegalizerCombiner.cpp new file mode 100644 index 000000000000..1cff1c8396ea --- /dev/null +++ b/contrib/llvm/lib/Target/Mips/MipsPreLegalizerCombiner.cpp @@ -0,0 +1,92 @@ +//=== lib/CodeGen/GlobalISel/MipsPreLegalizerCombiner.cpp --------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// 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/CombinerInfo.h" +#include "llvm/CodeGen/GlobalISel/MIPatternMatch.h" +#include "llvm/CodeGen/TargetPassConfig.h" + +#define DEBUG_TYPE "mips-prelegalizer-combiner" + +using namespace llvm; + +namespace { +class MipsPreLegalizerCombinerInfo : public CombinerInfo { +public: + MipsPreLegalizerCombinerInfo() + : CombinerInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false, + /*LegalizerInfo*/ nullptr) {} + virtual bool combine(GISelChangeObserver &Observer, MachineInstr &MI, + MachineIRBuilder &B) const override; +}; + +bool MipsPreLegalizerCombinerInfo::combine(GISelChangeObserver &Observer, + MachineInstr &MI, + MachineIRBuilder &B) const { + 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 |