• Michael Munday's avatar
    crypto/md5: simplify generic implementation · 7f998453
    Michael Munday authored
    This change uses library functions such as bits.RotateLeft32 to
    reduce the amount of code needed in the generic implementation.
    Since the code is now shorter I've also removed the option to
    generate a non-unrolled version of the code.
    
    I've also tried to remove bounds checks where possible to make
    the new version performant, however that is not the primary goal
    of this change since most architectures have assembly
    implementations already.
    
    Assembly performance:
    
    name                 old speed      new speed      delta
    Hash8Bytes           50.3MB/s ± 1%  59.1MB/s ± 0%  +17.63%  (p=0.000 n=9+8)
    Hash1K                590MB/s ± 0%   597MB/s ± 0%   +1.25%  (p=0.000 n=9+9)
    Hash8K                636MB/s ± 1%   638MB/s ± 1%     ~     (p=0.072 n=10+10)
    Hash8BytesUnaligned  50.5MB/s ± 0%  59.1MB/s ± 1%  +17.09%  (p=0.000 n=10+10)
    Hash1KUnaligned       589MB/s ± 1%   596MB/s ± 1%   +1.23%  (p=0.000 n=9+10)
    Hash8KUnaligned       638MB/s ± 1%   640MB/s ± 0%   +0.35%  (p=0.002 n=10+10)
    
    Pure Go performance:
    
    name                 old speed      new speed      delta
    Hash8Bytes           30.3MB/s ± 1%  42.8MB/s ± 0%  +41.20%  (p=0.000 n=9+9)
    Hash1K                364MB/s ± 4%   394MB/s ± 1%   +8.27%  (p=0.000 n=10+10)
    Hash8K                404MB/s ± 1%   420MB/s ± 0%   +4.17%  (p=0.000 n=10+9)
    Hash8BytesUnaligned  30.3MB/s ± 1%  42.8MB/s ± 1%  +40.92%  (p=0.000 n=9+10)
    Hash1KUnaligned       368MB/s ± 0%   394MB/s ± 0%   +7.07%  (p=0.000 n=9+9)
    Hash8KUnaligned       404MB/s ± 1%   411MB/s ± 3%   +1.91%  (p=0.026 n=9+10)
    
    Change-Id: I9a91fb52ea8d62964d5351bdf121e9fbc9282852
    Reviewed-on: https://go-review.googlesource.com/c/137355
    Run-TryBot: Michael Munday <mike.munday@ibm.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarBrad Fitzpatrick <bradfitz@golang.org>
    7f998453
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