[PATCH] D122077: [InstCombine] Fold (ctpop(X) == 1) | (X == 0) into ctpop(X) < 2

[Joerg Sonnenberger via Phabricator via llvm-commits]

joerg added a comment.

Why is this fold preferable to `(X & (X-1)) == 0`? At least on all architectures without native population count, the binary-and based test is preferable and it might even be better with it.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D122077/new/

https://reviews.llvm.org/D122077