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Message-ID: <20250306172107.GA1796@sol.localdomain> Date: Thu, 6 Mar 2025 09:21:07 -0800 From: Eric Biggers <ebiggers@...nel.org> To: linux-kernel@...r.kernel.org Cc: Bill Wendling <morbo@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Justin Stitt <justinstitt@...gle.com>, David Laight <david.laight.linux@...il.com>, linux-crypto@...r.kernel.org, llvm@...ts.linux.dev Subject: Re: [PATCH] x86/crc32: optimize tail handling for crc32c short inputs On Tue, Mar 04, 2025 at 01:32:16PM -0800, Eric Biggers wrote: > From: Eric Biggers <ebiggers@...gle.com> > > For handling the 0 <= len < sizeof(unsigned long) bytes left at the end, > do a 4-2-1 step-down instead of a byte-at-a-time loop. This allows > taking advantage of wider CRC instructions. Note that crc32c-3way.S > already uses this same optimization too. > > crc_kunit shows an improvement of about 25% for len=127. > > Suggested-by: H. Peter Anvin <hpa@...or.com> > Signed-off-by: Eric Biggers <ebiggers@...gle.com> > --- > > This applies to > https://web.git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git/log/?h=crc-next Applied to https://web.git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git/log/?h=crc-next - Eric
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