On Tue, Mar 04, 2025 at 01:32:16PM -0800, Eric Biggers wrote: > From: Eric Biggers <ebiggers@xxxxxxxxxx> > > 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@xxxxxxxxx> > Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> > --- > > 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
