[PATCH] D84948: [InstCombine] Fold select/and/or with freeze(undef) that is used in the op only

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

Just as another possibility, we could simply always fold `freeze undef` to `zeroinitializer` in InstCombine (regardless of number of uses). This is not always the optimal fold, but usually a good one. At least at this point, I don't think `freeze undef` is expected to be common and it's more important to get rid of the freeze than find the best replacement.


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https://reviews.llvm.org/D84948