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    SubjectRe: [PATCH 2/3] [CRYPTO] Add optimized SHA-1 implementation for i486+
    On Fri, Jun 08, 2007 at 05:42:53PM -0400, Benjamin Gilbert wrote:
    > Add x86-optimized implementation of the SHA-1 hash function, taken from
    > Nettle under the LGPL. This code will be enabled on kernels compiled for
    > 486es or better; kernels which support 386es will use the generic
    > implementation (since we need BSWAP).
    >
    > We disable building lib/sha1.o when an optimized implementation is
    > available, as the library link order for x86 (and x86_64) would otherwise
    > ignore the optimized version. The existing optimized implementation for ARM
    > does not do this; the library link order for that architecture appears to
    > favor the arch/arm/ version automatically. I've left this situation alone
    > since I'm not familiar with the ARM code, but a !ARM condition could be
    > added to CONFIG_SHA1_GENERIC if it makes sense.
    >
    > The code has been tested with tcrypt and the NIST test vectors.

    Have you benchmarked this against lib/sha1.c? Please post the results.
    Until then, I'm frankly skeptical that your unrolled version is faster
    because when I introduced lib/sha1.c the rolled version therein won by
    a significant margin and had 1/10th the cache footprint.

    --
    Mathematics is the supreme nostalgia of our time.
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