tree 71a8f579ba1233ea67a4cd03d798df86b6107d3d
parent c091767d87b7a6ef6016286bc0fae8add59b92de
author wdvxdr <wdvxdr1123@gmail.com> 1633680402 +0800
committer Keith Randall <khr@golang.org> 1634572915 +0000

cmd/compile: use MOVBE instruction for GOAMD64>=v3

encoding/binary benchmark on my laptop:
name                      old time/op    new time/op     delta
ReadSlice1000Int32s-8       4.42µs ± 5%     4.20µs ± 1%   -4.94%  (p=0.046 n=9+8)
ReadStruct-8                 359ns ± 8%      368ns ± 5%   +2.35%  (p=0.041 n=9+10)
WriteStruct-8                349ns ± 1%      357ns ± 1%   +2.15%  (p=0.000 n=8+10)
ReadInts-8                   235ns ± 1%      233ns ± 1%   -1.01%  (p=0.005 n=10+10)
WriteInts-8                  265ns ± 1%      274ns ± 1%   +3.45%  (p=0.000 n=10+10)
WriteSlice1000Int32s-8      4.61µs ± 5%     4.59µs ± 5%     ~     (p=0.986 n=10+10)
PutUint16-8                 0.56ns ± 4%     0.57ns ± 4%     ~     (p=0.101 n=10+10)
PutUint32-8                 0.83ns ± 2%     0.56ns ± 6%  -32.91%  (p=0.000 n=10+10)
PutUint64-8                 0.81ns ± 3%     0.62ns ± 4%  -23.82%  (p=0.000 n=10+10)
LittleEndianPutUint16-8     0.55ns ± 4%     0.55ns ± 3%     ~     (p=0.926 n=10+10)
LittleEndianPutUint32-8     0.41ns ± 4%     0.42ns ± 3%     ~     (p=0.148 n=10+9)
LittleEndianPutUint64-8     0.55ns ± 2%     0.56ns ± 6%     ~     (p=0.897 n=10+10)
ReadFloats-8                60.4ns ± 4%     59.0ns ± 1%   -2.25%  (p=0.007 n=10+10)
WriteFloats-8               72.3ns ± 2%     71.5ns ± 7%     ~     (p=0.089 n=10+10)
ReadSlice1000Float32s-8     4.21µs ± 3%     4.18µs ± 2%     ~     (p=0.197 n=10+10)
WriteSlice1000Float32s-8    4.61µs ± 2%     4.68µs ± 7%     ~     (p=1.000 n=8+10)
ReadSlice1000Uint8s-8        250ns ± 4%      247ns ± 4%     ~     (p=0.324 n=10+10)
WriteSlice1000Uint8s-8       227ns ± 5%      229ns ± 2%     ~     (p=0.193 n=10+7)
PutUvarint32-8              15.3ns ± 2%     15.4ns ± 4%     ~     (p=0.782 n=10+10)
PutUvarint64-8              38.5ns ± 1%     38.6ns ± 5%     ~     (p=0.396 n=8+10)

name                      old speed      new speed       delta
ReadSlice1000Int32s-8      890MB/s ±17%    953MB/s ± 1%   +7.00%  (p=0.027 n=10+8)
ReadStruct-8               209MB/s ± 8%    204MB/s ± 5%   -2.42%  (p=0.043 n=9+10)
WriteStruct-8              214MB/s ± 3%    210MB/s ± 1%   -1.75%  (p=0.003 n=9+10)
ReadInts-8                 127MB/s ± 1%    129MB/s ± 1%   +1.01%  (p=0.006 n=10+10)
WriteInts-8                113MB/s ± 1%    109MB/s ± 1%   -3.34%  (p=0.000 n=10+10)
WriteSlice1000Int32s-8     868MB/s ± 5%    872MB/s ± 5%     ~     (p=1.000 n=10+10)
PutUint16-8               3.55GB/s ± 4%   3.50GB/s ± 4%     ~     (p=0.093 n=10+10)
PutUint32-8               4.83GB/s ± 2%   7.21GB/s ± 6%  +49.16%  (p=0.000 n=10+10)
PutUint64-8               9.89GB/s ± 3%  12.99GB/s ± 4%  +31.26%  (p=0.000 n=10+10)
LittleEndianPutUint16-8   3.65GB/s ± 4%   3.65GB/s ± 4%     ~     (p=0.912 n=10+10)
LittleEndianPutUint32-8   9.74GB/s ± 3%   9.63GB/s ± 3%     ~     (p=0.222 n=9+9)
LittleEndianPutUint64-8   14.4GB/s ± 2%   14.3GB/s ± 5%     ~     (p=0.912 n=10+10)
ReadFloats-8               199MB/s ± 4%    203MB/s ± 1%   +2.27%  (p=0.007 n=10+10)
WriteFloats-8              166MB/s ± 2%    168MB/s ± 7%     ~     (p=0.089 n=10+10)
ReadSlice1000Float32s-8    949MB/s ± 3%    958MB/s ± 2%     ~     (p=0.218 n=10+10)
WriteSlice1000Float32s-8   867MB/s ± 2%    857MB/s ± 6%     ~     (p=1.000 n=8+10)
ReadSlice1000Uint8s-8     4.00GB/s ± 4%   4.06GB/s ± 4%     ~     (p=0.353 n=10+10)
WriteSlice1000Uint8s-8    4.40GB/s ± 4%   4.36GB/s ± 2%     ~     (p=0.193 n=10+7)
PutUvarint32-8             262MB/s ± 2%    260MB/s ± 4%     ~     (p=0.739 n=10+10)
PutUvarint64-8             208MB/s ± 1%    207MB/s ± 5%     ~     (p=0.408 n=8+10)

Updates #45453

Change-Id: Ifda0d48d54665cef45d46d3aad974062633142c4
Reviewed-on: https://go-review.googlesource.com/c/go/+/354670
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Matthew Dempsky <mdempsky@google.com>