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| author | Ilya Tocar <ilya.tocar@intel.com> | 2015-10-28 23:20:26 +0300 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2015-11-02 18:39:38 +0000 |
| commit | 0e23ca41d99c82d301badf1b762888e2c69e6c57 (patch) | |
| tree | 9339a0fb834ac1df57454c2051c33211a4c1393e /src/runtime/runtime2.go | |
| parent | cf73357e37b08fe80600470bb7618e1ea951b42e (diff) | |
| download | go-0e23ca41d99c82d301badf1b762888e2c69e6c57.tar.xz | |
bytes: speed up Compare() on amd64
Use AVX2 if available.
Results (haswell), below:
name old time/op new time/op delta
BytesCompare1-6 11.4ns ± 0% 11.4ns ± 0% ~ (all samples are equal)
BytesCompare2-6 11.4ns ± 0% 11.4ns ± 0% ~ (all samples are equal)
BytesCompare4-6 11.4ns ± 0% 11.4ns ± 0% ~ (all samples are equal)
BytesCompare8-6 9.29ns ± 2% 8.76ns ± 0% -5.72% (p=0.000 n=16+17)
BytesCompare16-6 9.29ns ± 2% 9.20ns ± 0% -1.02% (p=0.000 n=20+16)
BytesCompare32-6 11.4ns ± 1% 11.4ns ± 0% ~ (p=0.191 n=20+20)
BytesCompare64-6 14.4ns ± 0% 13.1ns ± 0% -8.68% (p=0.000 n=20+20)
BytesCompare128-6 20.2ns ± 0% 18.5ns ± 0% -8.27% (p=0.000 n=16+20)
BytesCompare256-6 29.3ns ± 0% 24.5ns ± 0% -16.38% (p=0.000 n=16+16)
BytesCompare512-6 46.8ns ± 0% 37.1ns ± 0% -20.78% (p=0.000 n=18+16)
BytesCompare1024-6 82.9ns ± 0% 62.3ns ± 0% -24.86% (p=0.000 n=20+14)
BytesCompare2048-6 155ns ± 0% 112ns ± 0% -27.74% (p=0.000 n=20+20)
CompareBytesEqual-6 10.1ns ± 1% 10.0ns ± 1% ~ (p=0.527 n=20+20)
CompareBytesToNil-6 10.0ns ± 2% 9.4ns ± 0% -6.57% (p=0.000 n=20+17)
CompareBytesEmpty-6 8.76ns ± 0% 8.76ns ± 0% ~ (all samples are equal)
CompareBytesIdentical-6 8.76ns ± 0% 8.76ns ± 0% ~ (all samples are equal)
CompareBytesSameLength-6 10.6ns ± 1% 10.6ns ± 1% ~ (p=0.240 n=20+20)
CompareBytesDifferentLength-6 10.6ns ± 0% 10.6ns ± 1% ~ (p=1.000 n=20+20)
CompareBytesBigUnaligned-6 132±s ± 1% 105±s ± 1% -20.61% (p=0.000 n=20+18)
CompareBytesBig-6 125±s ± 1% 105±s ± 1% -16.31% (p=0.000 n=20+20)
CompareBytesBigIdentical-6 8.13ns ± 0% 8.13ns ± 0% ~ (all samples are equal)
name old speed new speed delta
CompareBytesBigUnaligned-6 7.94GB/s ± 1% 10.01GB/s ± 1% +25.96% (p=0.000 n=20+18)
CompareBytesBig-6 8.38GB/s ± 1% 10.01GB/s ± 1% +19.48% (p=0.000 n=20+20)
CompareBytesBigIdentical-6 129TB/s ± 0% 129TB/s ± 0% +0.01% (p=0.003 n=17+19)
Change-Id: I820f31bab4582dd4204b146bb077c0d2f24cd8f5
Reviewed-on: https://go-review.googlesource.com/16434
Run-TryBot: Ilya Tocar <ilya.tocar@intel.com>
Reviewed-by: Klaus Post <klauspost@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Diffstat (limited to 'src/runtime/runtime2.go')
| -rw-r--r-- | src/runtime/runtime2.go | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/runtime/runtime2.go b/src/runtime/runtime2.go index 6b61cd62fa..f1337e570e 100644 --- a/src/runtime/runtime2.go +++ b/src/runtime/runtime2.go @@ -627,6 +627,8 @@ var ( cpuid_ecx uint32 cpuid_edx uint32 lfenceBeforeRdtsc bool + support_avx bool + support_avx2 bool goarm uint8 // set by cmd/link on arm systems ) |