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Date: Tue, 26 Sep 2023 00:39:06 +0200
From: Robert Clausecker <fuz@....su>
To: musl@...ts.openwall.com
Subject: SIMD-enhanced libc string functions
Greetings,
I'm currently working on implementing various libc string functions
using SIMD techniques for the FreeBSD libc. This is a project
sponsored by the FreeBSD Foundation, the resulting code is
available under a 2-clause BSD license. Currently, this encompasses
implementations for amd64 in scalar code or using SSE/SSE2 (two
functions also make use of SSE4.2).
Is there interest in adding such implementations to musl? Would this
be permitted by your license policy? If so, I can prepare change sets
to add these new implementations to musl once the project has concluded.
Functions that have been implemented include:
- stpcpy (thence strcpy)
- strchrnul (thence index, strchr)
- strcspn (using SSE4.2, thence strpbrk)
- strspn
- strcmp
- memchr (thence strnlen)
- strlen
- memcmp (thence bcmp)
- timingsafe_bcmp
- timingsafe_memcmp
On FreeBSD, I have added an ifunc-based dispatch framework to select the
appropriate function for the user's CPU. This anticipates additional
implementations using AVX and AVX-512. The implementations are easy to
use without the framework though.
Please let me know if there is interest.
Yours,
Robert Clausecker
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