[PATCH] D109151: [InstCombine] Convert xor (ashr X, BW-1), C -> select(X >=s 0, C, ~C)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

FWIW, we don't strictly need this to be xor-by-constant: https://alive2.llvm.org/ce/z/snX3_H
If everything is one-use, then we could allow xor-by-value too.
Not sure if it improves things or not though?


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https://reviews.llvm.org/D109151