Re: [PATCH 02/17] bitops: Add generic parity calculation for u64

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> Incidentally, in all of this, didn't anyone notice __builtin_parity()?

Yes.  It it has done sane for a decade on x86, yet does things such as
emitting a library call on other architectures.

https://godbolt.org/z/6qG3noebq

~Andrew




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