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[LTO] Add a run of LoopUnroll

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Loop trip counts can often be resolved during LTO. We should obviously be unrolling small loops once those trip counts have been resolved, but we weren't.

llvm-svn: 257767
This commit is contained in:
James Molloy 2016-01-14 15:00:09 +00:00
parent a3d2bfba9e
commit e02efd6bb1
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/IPO/PassManagerBuilder.cpp
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@ -573,7 +573,12 @@ void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
if (EnableLoopInterchange)
PM.add(createLoopInterchangePass());
if (!DisableUnrollLoops)
PM.add(createSimpleLoopUnrollPass()); // Unroll small loops
PM.add(createLoopVectorizePass(true, LoopVectorize));
// The vectorizer may have significantly shortened a loop body; unroll again.
if (!DisableUnrollLoops)
PM.add(createLoopUnrollPass());
// Now that we've optimized loops (in particular loop induction variables),
// we may have exposed more scalar opportunities. Run parts of the scalar