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Unroll again after running BBVectorize

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Because BBVectorize may significantly shorten a loop body, unroll
again after vectorization. This is especially important when using
runtime or partial unrolling.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173730 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2013-01-29 00:22:49 +00:00
parent d3427d3f40
commit c0b3d4c9c2
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/IPO/PassManagerBuilder.cpp
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@ -214,6 +214,10 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
MPM.add(createGVNPass()); // Remove redundancies
else
MPM.add(createEarlyCSEPass()); // Catch trivial redundancies
// BBVectorize may have significantly shortened a loop body; unroll again.
if (!DisableUnrollLoops)
MPM.add(createLoopUnrollPass());
}
MPM.add(createAggressiveDCEPass()); // Delete dead instructions