[PATCH] D79528: [ConstantFold] Optimize xor undef, undef to undef

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

This is correct, strictly speaking, but has the situation with misguided users really improved any?  That same code using _mm_xor_ps() or whatever to zero __m128 variables is probably still out there, and clang still doesn't print any diagnostic by default if you try to do that.  And this still isn't really a useful fold.


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