[PATCH] D51398: [InstCombine] Fold (neg (min/max ~X, C)) -> (add (min/max X, ~C), 1)

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: spatel, lebedev.ri.

Negate is equivalent to (add (xor X, -1), 1), so can pull out the (xor X, -1) part and use it to rewrite a min/max with an inverted input where the other operand can be freely inverted. Theoretically this could be extended to other subtracts than just a negate.


https://reviews.llvm.org/D51398

Files:
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  test/Transforms/InstCombine/sub.ll

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