[PATCH] D109446: DAG: Fix incorrect folding of fmul -1 to fneg

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

I think we can fold `(fmul X, -1.0) -> (fsub -0.0, X)` unconditionally; at least, Alive2 is happy with it. If we can do that, we can just let the existing fsub code figure out the rest.  Does that sound like a plan?


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  https://reviews.llvm.org/D109446/new/

https://reviews.llvm.org/D109446