[PATCH] D56155: [docs] cttz and ctlz return poison, not undef, when argument is 0

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

Based on the current documentation <https://llvm.org/docs/LangRef.html#poison-values> of poison values, `select`ing over poison is still poison by the first rule. I'm assuming that this is an inaccuracy in the documentation and `select`s are treated the same ways as phis? Otherwise the cited clang code would be affected.


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https://reviews.llvm.org/D56155