[PATCH] D54593: [X86] Fix PR39658: avoid duplicated successors in condibr merge

[Rong Xu via Phabricator via llvm-commits]

xur updated this revision to Diff 174854.
xur added a comment.

This is the updated version.  We will bail out the optimization is there are PHIs preventing the merge.

@Max: could you tell you real test case to see if this fixes the problem.

Note that this patch still leave this optimization off by default. I will have separated patch to turn if on later.


https://reviews.llvm.org/D54593

Files:
  lib/Target/X86/X86CondBrFolding.cpp
  lib/Target/X86/X86TargetMachine.cpp
  test/CodeGen/X86/pr39658.ll

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