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Summary: Consider the following diamond CFG: A / \ B C \/ D Suppose A->B and A->C have probabilities 81% and 19%. In block-placement, A->B is called a hot edge and the final placement should be ABDC. However, the current implementation outputs ABCD. This is because when choosing the next block of B, it checks if Freq(C->D) > Freq(B->D) * 20%, which is true (if Freq(A) = 100, then Freq(B->D) = 81, Freq(C->D) = 19, and 19 > 81*20%=16.2). Actually, we should use 25% instead of 20% as the probability here, so that we have 19 < 81*25%=20.25, and the desired ABDC layout will be generated. Reviewers: djasper, davidxl Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D20989 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272203 91177308-0d34-0410-b5e6-96231b3b80d8