[PATCH] D73978: [WIP][FPEnv] Don't transform FSUB(-0.0,X)->FNEG(X) when flushing denormals

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

The thing I'm somewhat worried about is a subtlety with constant folding. Constant folding will blindly fold unaware of whatever canonicalization needed to happen. willCanonicalize may have lied if something happened later that caused the canonicalizing operation to constant fold away


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  https://reviews.llvm.org/D73978/new/

https://reviews.llvm.org/D73978