[PATCH] D79116: [InstCombine] fold fpext into Xitofp

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

So the general idea here is centered around an "exact" cast: an sitofp that, for whatever reason, we know never rounds the result.  This is sort of the same idea as InstCombiner::FoldItoFPtoI, except that it's using a different method to prove the exact-ness.

Would it make sense to factor out the "IsExactIToFP" predicate into a separate method?


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  https://reviews.llvm.org/D79116/new/

https://reviews.llvm.org/D79116