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Summary: When propagating mass through irregular loops, the mass flowing through each loop header may not be equal. This was causing wrong frequencies to be computed for irregular loop headers. Fixed by keeping track of masses flowing through each of the headers in an irregular loop. To do this, we now keep track of per-header backedge weights. After the loop mass is distributed through the loop, the backedge weights are used to re-distribute the loop mass to the loop headers. Since each backedge will have a mass proportional to the different branch weights, the loop headers will end up with a more approximate weight distribution (as opposed to the current distribution that assumes that every loop header is the same). Reviewers: dexonsmith Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D10348 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239843 91177308-0d34-0410-b5e6-96231b3b80d8
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