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| author | Eric Biggers <ebiggers@google.com> | 2025-03-05 00:32:16 +0300 |
|---|---|---|
| committer | Eric Biggers <ebiggers@google.com> | 2025-03-10 19:29:29 +0300 |
| commit | 5aebe00b2f7215d996926517cc9710a1d2d8b7f9 (patch) | |
| tree | f870143ade76edc79af3573ba248d5f85d19fbbc /scripts/generate_rust_analyzer.py | |
| parent | 511484fa881e8ce32fda63c5c3d3492394dbddda (diff) | |
| download | linux-5aebe00b2f7215d996926517cc9710a1d2d8b7f9.tar.xz | |
x86/crc32: optimize tail handling for crc32c short inputs
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@zytor.com>
Acked-by: Uros Bizjak <ubizjak@gmail.com>
Link: https://lore.kernel.org/r/20250304213216.108925-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'scripts/generate_rust_analyzer.py')
0 files changed, 0 insertions, 0 deletions