[PATCH] D139275: [SimplifyCFG] `FoldBranchToCommonDest()`: deal with mismatched IV's in PHI's in common successor block

Fri Dec 16 08:07:53 PST 2022

joanahalili added a comment.

In D139275#3993229 <https://reviews.llvm.org/D139275#3993229>, @nickdesaulniers wrote:

> @nathanchance is reporting that this is breaking PPC32 Linux kernel boots.
> https://github.com/ClangBuiltLinux/linux/issues/1770
> We'll work on trying to get a reproducer or more info, but "heads up."

We are also experiencing some test failures that root cause to this commit. Here is a reproducer:
https://godbolt.org/z/aq6nYffxv

The function returns different results with the two different compiler versions.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D139275/new/

https://reviews.llvm.org/D139275