• Davies Liu's avatar
    hash/crc32: speedup crc32 of IEEE using slicingBy8 · 1e076035
    Davies Liu authored
    The Slicing-By-8 [1] algorithm has much performance improvements than
    current approach. This patch only uses it for IEEE, which is the most
    common case in practice.
    
    There is the benchmark on Mac OS X 10.9:
    
    benchmark                     old MB/s     new MB/s     speedup
    BenchmarkIEEECrc1KB           349.40       353.03       1.01x
    BenchmarkIEEECrc4KB           351.55       934.35       2.66x
    BenchmarkCastagnoliCrc1KB     7037.58      7392.63      1.05x
    
    This algorithm need 8K lookup table, so it's enabled only for block
    larger than 4K.
    
    We can see about 2.6x improvement for IEEE.
    
    Change-Id: I7f786d20f0949245e4aa101d7921669f496ed0f7
    Reviewed-on: https://go-review.googlesource.com/1863Reviewed-by: 's avatarRuss Cox <rsc@golang.org>
    1e076035
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