[PATCH] D76973: [LangRef] Clarify the semantics of branch on undef

[Nuno Lopes via Phabricator via llvm-commits]

nlopes added a comment.

Yes, introducing branches on a variable that may be undef/poison is not legal. However, you can use freeze to make it safe.
I think @aqjune fixed loop unswitching already. (don't recall if that was the reverted patch). It's true there a couple more places left to fix.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D76973/new/

https://reviews.llvm.org/D76973