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| author | Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | 2012-08-28 14:24:49 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2012-09-07 04:17:04 +0800 |
| commit | ddaea7869d29beb9e0042c96ea52c9cca2afd68a (patch) | |
| tree | d4d6d6e71ae0d1d451c58e7910ae3a05f55d0ad8 /kernel/srcu.c | |
| parent | f94a73f8dd5644f45f9d2e3139608ca83b932d93 (diff) | |
| download | linux-ddaea7869d29beb9e0042c96ea52c9cca2afd68a.tar.gz linux-ddaea7869d29beb9e0042c96ea52c9cca2afd68a.tar.bz2 linux-ddaea7869d29beb9e0042c96ea52c9cca2afd68a.zip | |
crypto: cast5-avx - tune assembler code for more performance
Patch replaces 'movb' instructions with 'movzbl' to break false register
dependencies, interleaves instructions better for out-of-order scheduling
and merges constant 16-bit rotation with round-key variable rotation.
tcrypt ECB results (128bit key):
Intel Core i5-2450M:
size old-vs-new new-vs-generic old-vs-generic
enc dec enc dec enc dec
256 1.18x 1.18x 2.45x 2.47x 2.08x 2.10x
1k 1.20x 1.20x 2.73x 2.73x 2.28x 2.28x
8k 1.20x 1.19x 2.73x 2.73x 2.28x 2.29x
[v2]
- Do instruction interleaving another way to avoid adding new FPU<=>CPU
register moves as these cause performance drop on Bulldozer.
- Improvements to round-key variable rotation handling.
- Further interleaving improvements for better out-of-order scheduling.
Cc: Johannes Goetzfried <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'kernel/srcu.c')
0 files changed, 0 insertions, 0 deletions