[PATCH] D73057: [InstCombine] fneg(X + C) --> -C - X

[Sanjay Patel via Phabricator via llvm-commits]

spatel created this revision.
spatel added reviewers: mcberg2017, arsenm, cameron.mcinally.
Herald added subscribers: hiraditya, wdng, mcrosier.
Herald added a project: LLVM.

This is 1 of the potential folds uncovered by extending D72521 <https://reviews.llvm.org/D72521>.

We don't seem to do this in the backend either (unless I'm not seeing some target-specific transform).

icc and gcc (appears to be target-specific) do this transform.


https://reviews.llvm.org/D73057

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/test/Transforms/InstCombine/fneg.ll

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