• Wei Xiao's avatar
    hash/crc32: optimize arm64 crc32 implementation · ab636b89
    Wei Xiao authored
    ARMv8 defines crc32 instruction.
    
    Comparing to the original crc32 calculation, this patch makes use of
    crc32 instructions to do crc32 calculation instead of the multiple
    lookup table algorithms.
    
    ARMv8 provides IEEE and Castagnoli polynomials for crc32 calculation
    so that the perfomance of these two types of crc32 get significant
    improved.
    
    name                                        old time/op   new time/op    delta
    CRC32/poly=IEEE/size=15/align=0-32            117ns ± 0%      38ns ± 0%   -67.44%
    CRC32/poly=IEEE/size=15/align=1-32            117ns ± 0%      38ns ± 0%   -67.52%
    CRC32/poly=IEEE/size=40/align=0-32            129ns ± 0%      41ns ± 0%   -68.37%
    CRC32/poly=IEEE/size=40/align=1-32            129ns ± 0%      41ns ± 0%   -68.29%
    CRC32/poly=IEEE/size=512/align=0-32           828ns ± 0%     246ns ± 0%   -70.29%
    CRC32/poly=IEEE/size=512/align=1-32           828ns ± 0%     132ns ± 0%   -84.06%
    CRC32/poly=IEEE/size=1kB/align=0-32          1.58µs ± 0%    0.46µs ± 0%   -70.98%
    CRC32/poly=IEEE/size=1kB/align=1-32          1.58µs ± 0%    0.46µs ± 0%   -70.92%
    CRC32/poly=IEEE/size=4kB/align=0-32          6.06µs ± 0%    1.74µs ± 0%   -71.27%
    CRC32/poly=IEEE/size=4kB/align=1-32          6.10µs ± 0%    1.74µs ± 0%   -71.44%
    CRC32/poly=IEEE/size=32kB/align=0-32         48.3µs ± 0%    13.7µs ± 0%   -71.61%
    CRC32/poly=IEEE/size=32kB/align=1-32         48.3µs ± 0%    13.7µs ± 0%   -71.60%
    CRC32/poly=Castagnoli/size=15/align=0-32      116ns ± 0%      38ns ± 0%   -67.07%
    CRC32/poly=Castagnoli/size=15/align=1-32      116ns ± 0%      38ns ± 0%   -66.90%
    CRC32/poly=Castagnoli/size=40/align=0-32      127ns ± 0%      40ns ± 0%   -68.11%
    CRC32/poly=Castagnoli/size=40/align=1-32      127ns ± 0%      40ns ± 0%   -68.11%
    CRC32/poly=Castagnoli/size=512/align=0-32     828ns ± 0%     132ns ± 0%   -84.06%
    CRC32/poly=Castagnoli/size=512/align=1-32     827ns ± 0%     132ns ± 0%   -84.04%
    CRC32/poly=Castagnoli/size=1kB/align=0-32    1.59µs ± 0%    0.22µs ± 0%   -85.89%
    CRC32/poly=Castagnoli/size=1kB/align=1-32    1.58µs ± 0%    0.22µs ± 0%   -85.79%
    CRC32/poly=Castagnoli/size=4kB/align=0-32    6.14µs ± 0%    0.77µs ± 0%   -87.40%
    CRC32/poly=Castagnoli/size=4kB/align=1-32    6.06µs ± 0%    0.77µs ± 0%   -87.25%
    CRC32/poly=Castagnoli/size=32kB/align=0-32   48.3µs ± 0%     5.9µs ± 0%   -87.71%
    CRC32/poly=Castagnoli/size=32kB/align=1-32   48.4µs ± 0%     6.0µs ± 0%   -87.69%
    CRC32/poly=Koopman/size=15/align=0-32         104ns ± 0%     104ns ± 0%    +0.00%
    CRC32/poly=Koopman/size=15/align=1-32         104ns ± 0%     104ns ± 0%    +0.00%
    CRC32/poly=Koopman/size=40/align=0-32         235ns ± 0%     235ns ± 0%    +0.00%
    CRC32/poly=Koopman/size=40/align=1-32         235ns ± 0%     235ns ± 0%    +0.00%
    CRC32/poly=Koopman/size=512/align=0-32       2.71µs ± 0%    2.71µs ± 0%    -0.07%
    CRC32/poly=Koopman/size=512/align=1-32       2.71µs ± 0%    2.71µs ± 0%    -0.04%
    CRC32/poly=Koopman/size=1kB/align=0-32       5.40µs ± 0%    5.39µs ± 0%    -0.06%
    CRC32/poly=Koopman/size=1kB/align=1-32       5.40µs ± 0%    5.40µs ± 0%    +0.02%
    CRC32/poly=Koopman/size=4kB/align=0-32       21.5µs ± 0%    21.5µs ± 0%    -0.16%
    CRC32/poly=Koopman/size=4kB/align=1-32       21.5µs ± 0%    21.5µs ± 0%    -0.05%
    CRC32/poly=Koopman/size=32kB/align=0-32       172µs ± 0%     172µs ± 0%    -0.07%
    CRC32/poly=Koopman/size=32kB/align=1-32       172µs ± 0%     172µs ± 0%    -0.01%
    
    name                                        old speed     new speed      delta
    CRC32/poly=IEEE/size=15/align=0-32          128MB/s ± 0%   394MB/s ± 0%  +207.95%
    CRC32/poly=IEEE/size=15/align=1-32          128MB/s ± 0%   394MB/s ± 0%  +208.09%
    CRC32/poly=IEEE/size=40/align=0-32          310MB/s ± 0%   979MB/s ± 0%  +216.07%
    CRC32/poly=IEEE/size=40/align=1-32          310MB/s ± 0%   979MB/s ± 0%  +216.16%
    CRC32/poly=IEEE/size=512/align=0-32         618MB/s ± 0%  2074MB/s ± 0%  +235.72%
    CRC32/poly=IEEE/size=512/align=1-32         618MB/s ± 0%  3852MB/s ± 0%  +523.55%
    CRC32/poly=IEEE/size=1kB/align=0-32         646MB/s ± 0%  2225MB/s ± 0%  +244.57%
    CRC32/poly=IEEE/size=1kB/align=1-32         647MB/s ± 0%  2225MB/s ± 0%  +243.87%
    CRC32/poly=IEEE/size=4kB/align=0-32         676MB/s ± 0%  2352MB/s ± 0%  +248.02%
    CRC32/poly=IEEE/size=4kB/align=1-32         672MB/s ± 0%  2352MB/s ± 0%  +250.15%
    CRC32/poly=IEEE/size=32kB/align=0-32        678MB/s ± 0%  2387MB/s ± 0%  +252.17%
    CRC32/poly=IEEE/size=32kB/align=1-32        678MB/s ± 0%  2388MB/s ± 0%  +252.11%
    CRC32/poly=Castagnoli/size=15/align=0-32    129MB/s ± 0%   393MB/s ± 0%  +205.51%
    CRC32/poly=Castagnoli/size=15/align=1-32    129MB/s ± 0%   390MB/s ± 0%  +203.41%
    CRC32/poly=Castagnoli/size=40/align=0-32    314MB/s ± 0%   988MB/s ± 0%  +215.04%
    CRC32/poly=Castagnoli/size=40/align=1-32    314MB/s ± 0%   987MB/s ± 0%  +214.68%
    CRC32/poly=Castagnoli/size=512/align=0-32   618MB/s ± 0%  3860MB/s ± 0%  +524.32%
    CRC32/poly=Castagnoli/size=512/align=1-32   619MB/s ± 0%  3859MB/s ± 0%  +523.66%
    CRC32/poly=Castagnoli/size=1kB/align=0-32   645MB/s ± 0%  4568MB/s ± 0%  +608.56%
    CRC32/poly=Castagnoli/size=1kB/align=1-32   650MB/s ± 0%  4567MB/s ± 0%  +602.94%
    CRC32/poly=Castagnoli/size=4kB/align=0-32   667MB/s ± 0%  5297MB/s ± 0%  +693.81%
    CRC32/poly=Castagnoli/size=4kB/align=1-32   676MB/s ± 0%  5297MB/s ± 0%  +684.00%
    CRC32/poly=Castagnoli/size=32kB/align=0-32  678MB/s ± 0%  5519MB/s ± 0%  +713.83%
    CRC32/poly=Castagnoli/size=32kB/align=1-32  677MB/s ± 0%  5497MB/s ± 0%  +712.04%
    CRC32/poly=Koopman/size=15/align=0-32       143MB/s ± 0%   144MB/s ± 0%    +0.27%
    CRC32/poly=Koopman/size=15/align=1-32       143MB/s ± 0%   144MB/s ± 0%    +0.33%
    CRC32/poly=Koopman/size=40/align=0-32       169MB/s ± 0%   170MB/s ± 0%    +0.12%
    CRC32/poly=Koopman/size=40/align=1-32       170MB/s ± 0%   170MB/s ± 0%    +0.08%
    CRC32/poly=Koopman/size=512/align=0-32      189MB/s ± 0%   189MB/s ± 0%    +0.07%
    CRC32/poly=Koopman/size=512/align=1-32      189MB/s ± 0%   189MB/s ± 0%    +0.04%
    CRC32/poly=Koopman/size=1kB/align=0-32      190MB/s ± 0%   190MB/s ± 0%    +0.05%
    CRC32/poly=Koopman/size=1kB/align=1-32      190MB/s ± 0%   190MB/s ± 0%    -0.01%
    CRC32/poly=Koopman/size=4kB/align=0-32      190MB/s ± 0%   190MB/s ± 0%    +0.15%
    CRC32/poly=Koopman/size=4kB/align=1-32      190MB/s ± 0%   191MB/s ± 0%    +0.05%
    CRC32/poly=Koopman/size=32kB/align=0-32     191MB/s ± 0%   191MB/s ± 0%    +0.06%
    CRC32/poly=Koopman/size=32kB/align=1-32     191MB/s ± 0%   191MB/s ± 0%    +0.02%
    
    Also fix a bug of arm64 assembler
    
    The optimization is mainly contributed by Fangming.Fang <fangming.fang@arm.com>
    
    Change-Id: I900678c2e445d7e8ad9e2a9ab3305d649230905f
    Reviewed-on: https://go-review.googlesource.com/40074Reviewed-by: 's avatarCherry Zhang <cherryyz@google.com>
    Run-TryBot: Cherry Zhang <cherryyz@google.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    ab636b89
os_linux_arm64.go 1019 Bytes