[PATCH] D143593: [InstCombine] Don't fold freeze poison when it's used in shufflevector

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

I'm getting a bad feeling because the hack is already growing. :)

What if we squash any cast of freeze(poison) into the freeze itself as an addition to `getUndefReplacement()`:
https://alive2.llvm.org/ce/z/o7J2JS

That would give us a far-fetched improvement on something like this:
https://alive2.llvm.org/ce/z/hC_Gws
...so that could be an independent patch before the shuffle hack.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D143593/new/

https://reviews.llvm.org/D143593