[PATCH] D63683: [X86] Cleanups and safety checks around the isFNEG

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon accepted this revision.
RKSimon added a comment.
This revision is now accepted and ready to land.

LGTM - as future work I've been wondering whether we should integrate this more with the isNegatibleForFree/GetNegatedExpression helpers in DAGCombine? A quick glance shows that several targets (X86, AMDGPU, ARM, AARCH64, SystemZ) all have very similar logic for generic and target-specific ops.


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