[PATCH] D68189: [InstCombine] recognize popcount implemented in hacker's delight.

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

In D68189#1688114 <https://reviews.llvm.org/D68189#1688114>, @xbolva00 wrote:

> I meant something like in foldAnyOrAllBitsSet. Final lshr is ok to have multiple uses, all partial computations should be m_Oneuse.


I don't think that's necessary for this transform. The difference is we are only creating a single instruction for this transform. Therefore, we can always replace the final instruction in the sequence with some other instruction without producing any extra instructions overall.


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