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authorEric Biggers <ebiggers@google.com>2018-09-01 00:17:07 -0700
committerHerbert Xu <herbert@gondor.apana.org.au>2018-09-04 11:37:05 +0800
commita1b22a5f45fe884147a99e7c381bcc48d9b2acef (patch)
treea285e59c34660ad0b822769b2746334e428b916d /drivers/md/dm-integrity.c
parentcrc-t10dif: Allow current transform to be inspected in sysfs (diff)
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crypto: arm/chacha20 - faster 8-bit rotations and other optimizations
Optimize ChaCha20 NEON performance by: - Implementing the 8-bit rotations using the 'vtbl.8' instruction. - Streamlining the part that adds the original state and XORs the data. - Making some other small tweaks. On ARM Cortex-A7, these optimizations improve ChaCha20 performance from about 12.08 cycles per byte to about 11.37 -- a 5.9% improvement. There is a tradeoff involved with the 'vtbl.8' rotation method since there is at least one CPU (Cortex-A53) where it's not fastest. But it seems to be a better default; see the added comment. Overall, this patch reduces Cortex-A53 performance by less than 0.5%. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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