9a14cd9e75
Use SIMD instructions when counting a single byte. Inspired from runtime IndexByte implementation. Benchmark results of bytes, where 1 byte in every 8 is the one we are looking: name old time/op new time/op delta CountSingle/10-8 96.1ns ± 1% 38.8ns ± 0% -59.64% (p=0.000 n=9+7) CountSingle/32-8 172ns ± 2% 36ns ± 1% -79.27% (p=0.000 n=10+10) CountSingle/4K-8 18.2µs ± 1% 0.9µs ± 0% -95.17% (p=0.000 n=9+10) CountSingle/4M-8 18.4ms ± 0% 0.9ms ± 0% -95.00% (p=0.000 n=10+9) CountSingle/64M-8 284ms ± 4% 19ms ± 0% -93.40% (p=0.000 n=10+10) name old speed new speed delta CountSingle/10-8 104MB/s ± 1% 258MB/s ± 0% +147.99% (p=0.000 n=9+10) CountSingle/32-8 185MB/s ± 1% 897MB/s ± 1% +385.33% (p=0.000 n=9+10) CountSingle/4K-8 225MB/s ± 1% 4658MB/s ± 0% +1967.40% (p=0.000 n=9+10) CountSingle/4M-8 228MB/s ± 0% 4555MB/s ± 0% +1901.71% (p=0.000 n=10+9) CountSingle/64M-8 236MB/s ± 4% 3575MB/s ± 0% +1414.69% (p=0.000 n=10+10) Change-Id: Ifccb51b3c8658c49773fe05147c3cf3aead361e5 Reviewed-on: https://go-review.googlesource.com/71111 Reviewed-by: Cherry Zhang <cherryyz@google.com> Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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The Go Programming Language
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