[PATCH] D87149: [InstCombine] erase instructions leading up to unreachable

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

@lebedev.ri I don't think the printf() case is any different. Keep in mind that undefined behavior acts retroactively, so if we know that unreachable will be executed later, we are free to optimize away side-effects before it as well. (If printf is not considered willreturn, then we cannot optimize it away, and won't.)


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https://reviews.llvm.org/D87149