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Add comments about why we put LoopSink pass at the very late stage.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286480 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dehao Chen 2016-11-10 17:42:18 +00:00
parent 68c986108b
commit fb6e3a842a
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/IPO/PassManagerBuilder.cpp
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@ -647,6 +647,10 @@ void PassManagerBuilder::populateModulePassManager(
if (MergeFunctions)
MPM.add(createMergeFunctionsPass());
// LoopSink pass sinks instructions hoisted by LICM, which serves as a
// canonicalization pass that enables other optimizations. As a result,
// LoopSink pass needs to be a very late IR pass to avoid undoing LICM
// result too early.
MPM.add(createLoopSinkPass());
// Get rid of LCSSA nodes.
MPM.add(createInstructionSimplifierPass());