diff options
| author | Wei Xiao <wei.xiao@arm.com> | 2017-06-16 06:45:14 +0000 |
|---|---|---|
| committer | Brad Fitzpatrick <bradfitz@golang.org> | 2017-11-21 19:07:38 +0000 |
| commit | 9a14cd9e7556e68ea98255ae809b5862d574df9e (patch) | |
| tree | e3f36968e830bc9313f0ea83bdf622f54ee6aca0 /src/cmd/asm | |
| parent | 63ef3cde335e5b46fc3c8027b5e2f474a26717e8 (diff) | |
| download | go-9a14cd9e7556e68ea98255ae809b5862d574df9e.tar.xz | |
bytes: add optimized countByte for arm64
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>
Diffstat (limited to 'src/cmd/asm')
| -rw-r--r-- | src/cmd/asm/internal/asm/testdata/arm64.s | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/cmd/asm/internal/asm/testdata/arm64.s b/src/cmd/asm/internal/asm/testdata/arm64.s index 269e363f7e..ab6ad5bcb7 100644 --- a/src/cmd/asm/internal/asm/testdata/arm64.s +++ b/src/cmd/asm/internal/asm/testdata/arm64.s @@ -51,6 +51,11 @@ TEXT foo(SB), DUPOK|NOSPLIT, $-8 SHA1P V11.S4, V10, V9 // 49110b5e VADDV V0.S4, V0 // 00b8b14e VMOVI $82, V0.B16 // 40e6024f + VUADDLV V6.B16, V6 // c638306e + VADD V1, V2, V3 // 4384e15e + VADD V1, V3, V3 // 6384e15e + VSUB V12, V30, V30 // de87ec7e + VSUB V12, V20, V30 // 9e86ec7e // LTYPE1 imsr ',' spreg ',' // { |