438818d9f1
Similar to https://go-review.googlesource.com/28586, but for package bytes instead of strings. This provides simpler code and some performance gain. Also update strings.Count to use the same code. On AMD64 with heavily optimized Index I see: name old time/op new time/op delta Count/10-6 47.3ns ± 0% 36.8ns ± 0% -22.35% (p=0.000 n=10+10) Count/32-6 286ns ± 0% 38ns ± 0% -86.71% (p=0.000 n=10+10) Count/4K-6 50.1µs ± 0% 4.4µs ± 0% -91.18% (p=0.000 n=10+10) Count/4M-6 48.1ms ± 1% 4.5ms ± 0% -90.56% (p=0.000 n=10+9) Count/64M-6 784ms ± 0% 73ms ± 0% -90.73% (p=0.000 n=10+10) CountEasy/10-6 28.4ns ± 0% 31.0ns ± 0% +9.23% (p=0.000 n=10+10) CountEasy/32-6 30.6ns ± 0% 37.0ns ± 0% +20.92% (p=0.000 n=10+10) CountEasy/4K-6 186ns ± 0% 198ns ± 0% +6.45% (p=0.000 n=9+10) CountEasy/4M-6 233µs ± 2% 234µs ± 2% ~ (p=0.912 n=10+10) CountEasy/64M-6 6.70ms ± 0% 6.68ms ± 1% ~ (p=0.762 n=8+10) name old speed new speed delta Count/10-6 211MB/s ± 0% 272MB/s ± 0% +28.77% (p=0.000 n=10+9) Count/32-6 112MB/s ± 0% 842MB/s ± 0% +652.84% (p=0.000 n=10+10) Count/4K-6 81.8MB/s ± 0% 927.6MB/s ± 0% +1033.63% (p=0.000 n=10+9) Count/4M-6 87.2MB/s ± 1% 924.0MB/s ± 0% +959.25% (p=0.000 n=10+9) Count/64M-6 85.6MB/s ± 0% 922.9MB/s ± 0% +978.31% (p=0.000 n=10+10) CountEasy/10-6 352MB/s ± 0% 322MB/s ± 0% -8.41% (p=0.000 n=10+10) CountEasy/32-6 1.05GB/s ± 0% 0.87GB/s ± 0% -17.35% (p=0.000 n=9+10) CountEasy/4K-6 22.0GB/s ± 0% 20.6GB/s ± 0% -6.33% (p=0.000 n=10+10) CountEasy/4M-6 18.0GB/s ± 2% 18.0GB/s ± 2% ~ (p=0.912 n=10+10) CountEasy/64M-6 10.0GB/s ± 0% 10.0GB/s ± 1% ~ (p=0.762 n=8+10) On 386, without asm version of Index: Count/10-6 57.0ns ± 0% 56.9ns ± 0% -0.11% (p=0.006 n=10+9) Count/32-6 340ns ± 0% 274ns ± 0% -19.48% (p=0.000 n=10+9) Count/4K-6 49.5µs ± 0% 37.1µs ± 0% -24.96% (p=0.000 n=10+10) Count/4M-6 51.1ms ± 0% 38.2ms ± 0% -25.21% (p=0.000 n=10+10) Count/64M-6 818ms ± 0% 613ms ± 0% -25.07% (p=0.000 n=8+10) CountEasy/10-6 60.0ns ± 0% 70.4ns ± 0% +17.34% (p=0.000 n=10+10) CountEasy/32-6 81.1ns ± 0% 94.0ns ± 0% +15.97% (p=0.000 n=9+10) CountEasy/4K-6 4.37µs ± 0% 4.39µs ± 0% +0.30% (p=0.000 n=10+9) CountEasy/4M-6 4.43ms ± 0% 4.43ms ± 0% ~ (p=0.579 n=10+10) CountEasy/64M-6 70.9ms ± 0% 70.9ms ± 0% ~ (p=0.912 n=10+10) name old speed new speed delta Count/10-6 176MB/s ± 0% 176MB/s ± 0% +0.10% (p=0.000 n=10+9) Count/32-6 93.9MB/s ± 0% 116.5MB/s ± 0% +24.06% (p=0.000 n=10+9) Count/4K-6 82.7MB/s ± 0% 110.3MB/s ± 0% +33.26% (p=0.000 n=10+10) Count/4M-6 82.1MB/s ± 0% 109.7MB/s ± 0% +33.70% (p=0.000 n=10+10) Count/64M-6 82.0MB/s ± 0% 109.5MB/s ± 0% +33.46% (p=0.000 n=8+10) CountEasy/10-6 167MB/s ± 0% 142MB/s ± 0% -14.75% (p=0.000 n=9+10) CountEasy/32-6 395MB/s ± 0% 340MB/s ± 0% -13.77% (p=0.000 n=10+10) CountEasy/4K-6 936MB/s ± 0% 934MB/s ± 0% -0.29% (p=0.000 n=10+9) CountEasy/4M-6 947MB/s ± 0% 946MB/s ± 0% ~ (p=0.591 n=10+10) CountEasy/64M-6 947MB/s ± 0% 947MB/s ± 0% ~ (p=0.867 n=10+10) Change-Id: Ia76b247372b6f5b5d23a9f10253a86536a5153b3 Reviewed-on: https://go-review.googlesource.com/36489 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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