Taewook Oh 4440ca5fab Improve profile-guided heuristics to use estimated trip count. ... Summary: Existing heuristic uses the ratio between the function entry frequency and the loop invocation frequency to find cold loops. However, even if the loop executes frequently, if it has a small trip count per each invocation, vectorization is not beneficial. On the other hand, even if the loop invocation frequency is much smaller than the function invocation frequency, if the trip count is high it is still beneficial to vectorize the loop. This patch uses estimated trip count computed from the profile metadata as a primary metric to determine coldness of the loop. If the estimated trip count cannot be computed, it falls back to the original heuristics. Reviewers: Ayal, mssimpso, mkuper, danielcdh, wmi, tejohnson Reviewed By: tejohnson Subscribers: tejohnson, mzolotukhin, llvm-commits Differential Revision: https://reviews.llvm.org/D32451 llvm-svn: 305729		2017-06-19 18:48:58 +00:00
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LoopVectorize.h	Improve profile-guided heuristics to use estimated trip count.	2017-06-19 18:48:58 +00:00
SLPVectorizer.h	[SLP] Comment fix, NFC.	2017-06-07 20:37:24 +00:00