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06ac8cfbd1
Summary:
Loops with inequality comparers, such as:
// unsigned bound
for (unsigned i = 1; i < bound; ++i) {...}
have getSmallConstantMaxTripCount report a large maximum static
trip count - in this case, 0xffff fffe. However, profiling info
may show that the trip count is much smaller, and thus
counter-recommend vectorization.
This change:
- flips loop-vectorize-with-block-frequency on by default.
- validates profiled loop frequency data supports vectorization,
when static info appears to not counter-recommend it. Absence
of profile data means we rely on static data, just as we've
done so far.
Reviewers: twoh, mkuper, davidxl, tejohnson, Ayal
Reviewed By: davidxl
Subscribers: bkramer, llvm-commits
Differential Revision: https://reviews.llvm.org/D42946
llvm-svn: 324543
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| .. | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||
| LoadStoreVectorizer.cpp | ||
| LoopVectorizationPlanner.h | ||
| LoopVectorize.cpp | ||
| SLPVectorizer.cpp | ||
| Vectorize.cpp | ||
| VPlan.cpp | ||
| VPlan.h | ||
| VPlanValue.h | ||