[PATCH] D58166: [BPI] Look through bitcasts in calcZeroHeuristic

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: apilipenko, bkramer, john.brawn, gberry.

Constant hoisting may have hidden a constant behind a bitcast so that it isn't folded into its users. However, this prevents BPI from calculating some of its heuristics that are based upon constant values. So, I've added a simple helper function to look through these casts.


https://reviews.llvm.org/D58166

Files:
  lib/Analysis/BranchProbabilityInfo.cpp
  test/Analysis/BranchProbabilityInfo/zero_heuristics.ll

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