[PATCH] D48111: [JumpThreading] Don't try to rewrite a use if it's already valid.

[Michael Zolotukhin via Phabricator via llvm-commits]

mzolotukhin added a comment.

> do you happen to know why?

The difference compared to the old `SSAUpdater` is in how we handled uses and defs located in the same block - it did not lead to a problem with the old `SSAUpdater`, but was unnecessary anyway, since such uses don't need to be rewritten (not in general, but in this particular case when the use is still dominated by its existing def).

Michael


Repository:
  rL LLVM

https://reviews.llvm.org/D48111