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

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Message-ID: <4259A207-7B5F-4D25-A8AE-144D24554201@zytor.com>
Date: Tue, 25 Feb 2025 17:35:26 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Andrew Cooper <andrew.cooper3@...rix.com>
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Subject: Re: [PATCH 02/17] bitops: Add generic parity calculation for u64

On February 25, 2025 1:43:27 PM PST, Andrew Cooper <andrew.cooper3@...rix.com> wrote:
>> 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

And not even a smart one at that.