[PATCH] D68408: [InstCombine] Unfold `sub %x, %y` -> `add (sub 0, %y), %x` IFF `%y` can be freely negated

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri updated this revision to Diff 223181.
lebedev.ri added a comment.

Actually, `sub` can be freely negated.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D68408/new/

https://reviews.llvm.org/D68408

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/lib/Transforms/InstCombine/InstCombineInternal.h
  llvm/test/Transforms/InstCombine/sub-of-negatible.ll

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