[PATCH] D30633: [BPI] Reduce the probability of unreachable edge to minimal value greater than 0

[Serguei Katkov via Phabricator via llvm-commits]

skatkov added a comment.

Chandler is right in all comments :)

1. The main motivation of the patch is to avoid "the case where the UR branch probability ends up *higher* than the loop exit branch probability". In this terms I'm completely ok with this patch and there is not need to go with zero. The question about zero from my side was mostly about understanding why zero is not good.
2. Th UR branch probability without patch is equal to 1/(2^20) while with this change it will be 1/(2^31), so with the patch it becomes lower.


https://reviews.llvm.org/D30633