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[NFC] Clarify comment about LoopDeletionPass in the optimization pipeline 

Reviewed By: lebedev.ri

Differential Revision: https://reviews.llvm.org/D115179
This commit is contained in:
Arthur Eubanks 2021-12-06 13:04:57 -08:00
parent 591eb2bdb6
commit 5c7e783ebe
1 changed files with 3 additions and 2 deletions
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5
llvm/lib/Passes/PassBuilderPipelines.cpp
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@ -1164,8 +1164,9 @@ PassBuilder::buildModuleOptimizationPipeline(OptimizationLevel Level,
// Disable header duplication at -Oz.
LPM.addPass(LoopRotatePass(Level != OptimizationLevel::Oz, LTOPreLink));
// Some loops may have become dead by now. Try to delete them.
// FIXME: see disscussion in https://reviews.llvm.org/D112851
// this may need to be revisited once GVN is more powerful.
// FIXME: see discussion in https://reviews.llvm.org/D112851,
// this may need to be revisited once we run GVN before loop deletion
// in the simplification pipeline.
LPM.addPass(LoopDeletionPass());
OptimizePM.addPass(createFunctionToLoopPassAdaptor(
std::move(LPM), /*UseMemorySSA=*/false, /*UseBlockFrequencyInfo=*/false));