[PATCH] D45065: [InstCombine] Fix PR17564: don't fold [zs]ext into phi.

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

In https://reviews.llvm.org/D45065#1054271, @spatel wrote:

> but I need to look closer at how the case in the bug report escaped the matching that we already have in foldSelectInstWithICmp() and foldSelectICmpAnd().


Uhm, you know, i have added `return nullptr;` or `return false;` as the first statement in those functions, and even then those folds (`@just_select`, `@zext_of_select`, `@sext_of_select`) in this diff still happen.
So i'm not quite sure where they are happening...


Repository:
  rL LLVM

https://reviews.llvm.org/D45065