git: 9427ae6f36 - main - Status/2023Q2/simd.adoc: Add report

The branch main has been updated by salvadore:

URL: https://cgit.FreeBSD.org/doc/commit/?id=9427ae6f360fcd8761d25b04dd63d1ab5429f7ff

commit 9427ae6f360fcd8761d25b04dd63d1ab5429f7ff
Author:     Robert Clausecker <clausecker@FreeBSD.org>
AuthorDate: 2023-07-06 15:52:31 +0000
Commit:     Lorenzo Salvadore <salvadore@FreeBSD.org>
CommitDate: 2023-07-06 16:01:17 +0000

    Status/2023Q2/simd.adoc: Add report
    
    Reviewed by:    status (Pau Amma <pauamma@gundo.com>)
    Approved by:    dbaio (mentor, implicit)
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+=== SIMD enhancements for amd64
+
+Links: +
+link:https://reviews.freebsd.org/D40693[SIMD dispatch framework draft] URL: link:https://reviews.freebsd.org/D40693[] +
+link:http://fuz.su/~fuz/freebsd/2023-04-05_libc-proposal.txt[project proposal] URL: link:http://fuz.su/~fuz/freebsd/2023-04-05_libc-proposal.txt
+
+Contact: Robert Clausecker <clausecker@FreeBSD.org>
+
+SIMD instruction set extensions such as SSE, AVX, and NEON are ubiquitous on modern computers and offer performance advantages for many applications.
+The goal of this project is to provide SIMD-enhanced versions of common libc functions (mostly those described in man:string[3]), speeding up most C programs.
+
+For each function optimised, up to four implementations will be provided:
+
+ * a *scalar* implementation optimised for amd64, but without any SIMD usage,
+ * a *baseline* implementation using SSE and SSE2 or alternatively an *x86-64-v2* implementation using all SSE extensions up to SSE4.2,
+ * an *x86-64-v3* implementation using AVX and AVX2, and
+ * an *x86-64-v4* implementation using AVX-512F/BW/CD/DQ.
+
+Users will be able to select which level of SIMD enhancements to use by setting the `AMD64_ARCHLEVEL` environment variable.
+
+While the current project only concerns amd64, the work may be expanded to other architectures like arm64 in the future.
+
+Sponsor: The FreeBSD Foundation