[PATCH] D75157: [DAGCombine] Perform the fold of A - (-B) -> A + B only when it is cheaper

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

Loss of commutativity by going from fadd to fsub will likely cause register pressure regressions.


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  https://reviews.llvm.org/D75157/new/

https://reviews.llvm.org/D75157