[PATCH] D144329: [InstCombine] canonicalize "extract lowest set bit" away from cttz intrinsic

[Nikita Popov via Phabricator via llvm-commits]

nikic accepted this revision.
nikic added a comment.
This revision is now accepted and ready to land.

LGTM. I think this is a reasonable canonical form, especially as @goldstein.w.n added KnownBits support for these patterns recently.

Worth noting that for pow2 detection we canonicalize in the reverse direction (towards ctpop and icmp), and I don't quite remember why we ended up going with that somewhat unusual choice.


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