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Author SHA1 Message Date
Akira Hatanaka 5638b89944 Fix a bug in which BranchProbabilityInfo wasn't setting branch weights of basic blocks inside loops correctly. 
Previously, BranchProbabilityInfo::calcLoopBranchHeuristics would determine the weights of basic blocks inside loops even when it didn't have enough information to estimate the branch probabilities correctly. This patch fixes the function to exit early if it doesn't see any exit edges or back edges and let the later heuristics determine the weights.

This fixes PR18705 and <rdar://problem/15991090>.

Differential Revision: http://reviews.llvm.org/D3363

llvm-svn: 206194
 2014-04-14 16:56:19 +00:00
Manman Ren 37c9267107 PGO branch weight: fix PR18752. 
Fix a bug triggered in IfConverterTriangle when CvtBB has multiple predecessors
by getting the weights before removing a successor.

llvm-svn: 200958
 2014-02-07 00:38:56 +00:00