[PATCH] D57875: [LegalizeTypes] Expand FNEG to bitwise op for IEEE FP types

[Eli Friedman via Phabricator via llvm-commits]

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

LGTM

> Without this patch is the fneg instruction getting turned into a subtraction instruction? I hope not on any platform!

Without this patch we generate calls to __subsf3 etc.  There's also equivalent code in LegalizeDAG, but I think in practice it doesn't get used because targets with floating-point support generally have a native fneg instruction.


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