[PATCH] D41381: [InstCombine] Missed optimization in math expression: squashing exp(log), log(exp)

[Davide Italiano via Phabricator via llvm-commits]

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I don't have access to my checkout here, but I'm fairly sure we do something similar in SimplifyLibCalls.
I understand many of the pattern proposed will be duplicated, which is, not ideal.
Also, I'm pretty sure @scanon once taught me (when I implemented a similar transformation in simplifylibcalls) that these can underflow/overflow pretty dramatically, so, shouldn't these only be enabled under `-ffast-math` ?


https://reviews.llvm.org/D41381