| commit | 5bba5053675f102a3a81242e8f7551791ae5a56e | [log] [tgz] |
|---|---|---|
| author | Ian Davis <nospam@iandavis.com> | Mon Sep 24 10:20:46 2018 +0100 |
| committer | Brad Fitzpatrick <bradfitz@golang.org> | Tue Sep 25 18:57:36 2018 +0000 |
| tree | 870d832100166714a667e490b22ff772662de9a6 | |
| parent | e945623930d2c85b9a81476203451ca8f4092875 [diff] |
image/draw: optimize bounds checks in loops Use subslices with known length and cap to give bounds checking hints to the compiler. Improves over the earlier pointer based optimizations in https://go-review.googlesource.com/c/go/+/14093 for GlyphOver but not for FillOver so the latter is left unchanged. See #27857 for discussion of small caps used in subslices. name old time/op new time/op delta FillOver-8 607µs ± 1% 609µs ± 1% ~ (p=0.447 n=9+10) FillSrc-8 23.0µs ± 1% 22.9µs ± 2% ~ (p=0.412 n=9+10) CopyOver-8 647µs ± 0% 560µs ± 0% -13.43% (p=0.000 n=9+10) CopySrc-8 19.3µs ± 1% 19.1µs ± 2% -0.66% (p=0.029 n=10+10) NRGBAOver-8 697µs ± 1% 651µs ± 1% -6.64% (p=0.000 n=10+10) NRGBASrc-8 405µs ± 1% 347µs ± 0% -14.23% (p=0.000 n=10+10) YCbCr-8 432µs ± 2% 431µs ± 1% ~ (p=0.764 n=10+9) Gray-8 164µs ± 1% 139µs ± 1% -15.44% (p=0.000 n=10+10) CMYK-8 498µs ± 0% 461µs ± 0% -7.49% (p=0.000 n=10+9) GlyphOver-8 220µs ± 0% 199µs ± 0% -9.52% (p=0.000 n=9+10) RGBA-8 3.81ms ± 5% 3.79ms ± 5% ~ (p=0.549 n=9+10) Paletted-8 1.73ms ± 0% 1.73ms ± 1% ~ (p=0.278 n=10+9) GenericOver-8 11.0ms ± 2% 11.0ms ± 1% ~ (p=0.842 n=9+10) GenericMaskOver-8 5.29ms ± 1% 5.30ms ± 0% ~ (p=0.182 n=9+10) GenericSrc-8 4.24ms ± 1% 4.24ms ± 0% ~ (p=0.436 n=9+9) GenericMaskSrc-8 7.89ms ± 1% 7.90ms ± 2% ~ (p=0.631 n=10+10) Change-Id: I6fe1b21bb5e255826cbfdd2e73efd5858cd5557c Reviewed-on: https://go-review.googlesource.com/136935 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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