Date: Thu, 15 May 2025 03:03:16 +0000 From: Alexey Dokuchaev <danfe@freebsd.org> To: Robert Clausecker <fuz@freebsd.org> Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 8b4684afcde3 - main - lib/libmd: add optimised SHA1 implementations for amd64 Message-ID: <aCVZdOS09EkCdjqG@FreeBSD.org> In-Reply-To: <202505142340.54ENecbI000166@gitrepo.freebsd.org> References: <202505142340.54ENecbI000166@gitrepo.freebsd.org>
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On Wed, May 14, 2025 at 11:40:38PM +0000, Robert Clausecker wrote: > commit 8b4684afcde3930eb49490f0b8431c4cb2ad9a46 > > lib/libmd: add optimised SHA1 implementations for amd64 > > Three implementations are provided: one using just scalar > instructions, one using AVX2, and one using the SHA instructions > (SHANI). The AVX2 version uses a complicated multi-block carry > scheme described in an Intel whitepaper Sounds pretty cool! How feasible would be coming up with AVX-only code? My CPU does not support AVX2 but I often need to compute SHA1 sums. ./danfe
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