[PATCH] D81449: [JumpThreading] Handle zero !prof branch_weights

[Yevgeny Rouban via Phabricator via llvm-commits]

yrouban marked an inline comment as done.
yrouban added a comment.

@kazu, @nikic, @yamauchi, @ebrevnov, @efriedma, please review this small fix.



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Comment at: llvm/lib/Transforms/Scalar/JumpThreading.cpp:257-260
     BP = (CI->isOne() ? BranchProbability::getBranchProbability(
                             TrueWeight, TrueWeight + FalseWeight)
                       : BranchProbability::getBranchProbability(
                             FalseWeight, TrueWeight + FalseWeight));
----------------
Here //BranchProbability::getBranchProbability(..., TrueWeight + FalseWeight)// results in zero denominator if both //TrueWeight// and //FalseWeight// are zero.


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  https://reviews.llvm.org/D81449/new/

https://reviews.llvm.org/D81449