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Ian Davis authored
Use a subslice of the pixel data to give the compiler hints for bounds checking. Only do this for image formats that require 4 or more slice reads/writes. See #27857 for discussion of small cap sizes. name old time/op new time/op delta At/rgba-8 18.8ns ± 2% 18.5ns ± 1% -1.49% (p=0.026 n=10+10) At/rgba64-8 22.2ns ± 2% 21.1ns ± 3% -4.51% (p=0.000 n=10+10) At/nrgba-8 18.8ns ± 2% 18.7ns ± 2% ~ (p=0.467 n=10+10) At/nrgba64-8 21.9ns ± 2% 21.0ns ± 2% -4.15% (p=0.000 n=10+9) At/alpha-8 14.3ns ± 1% 14.3ns ± 2% ~ (p=0.543 n=10+10) At/alpha16-8 6.43ns ± 1% 6.47ns ± 1% ~ (p=0.053 n=10+10) At/gray-8 14.4ns ± 2% 14.6ns ± 5% ~ (p=0.194 n=10+10) At/gray16-8 6.52ns ± 1% 6.55ns ± 2% ~ (p=0.610 n=10+10) At/paletted-8 4.17ns ± 1% 4.21ns ± 2% ~ (p=0.095 n=9+10) Set/rgba-8 39.2ns ± 2% 40.1ns ± 4% +2.45% (p=0.007 n=10+10) Set/rgba64-8 46.2ns ± 3% 43.3ns ± 3% -6.11% (p=0.000 n=10+10) Set/nrgba-8 39.2ns ± 1% 39.7ns ± 5% ~ (p=0.407 n=10+10) Set/nrgba64-8 45.6ns ± 3% 42.9ns ± 3% -5.83% (p=0.000 n=9+10) Set/alpha-8 35.0ns ± 3% 34.1ns ± 2% -2.43% (p=0.017 n=10+10) Set/alpha16-8 36.3ns ± 4% 35.8ns ± 5% ~ (p=0.254 n=10+10) Set/gray-8 19.8ns ± 1% 19.7ns ± 0% -0.69% (p=0.002 n=8+6) Set/gray16-8 36.0ns ± 1% 36.4ns ± 2% +1.08% (p=0.037 n=10+10) Set/paletted-8 39.1ns ± 0% 39.6ns ± 1% +1.30% (p=0.000 n=10+10) RGBAAt-8 3.72ns ± 1% 3.58ns ± 1% -3.76% (p=0.000 n=9+10) RGBASetRGBA-8 4.35ns ± 1% 3.70ns ± 1% -14.92% (p=0.000 n=10+10) RGBA64At-8 5.08ns ± 1% 3.69ns ± 1% -27.40% (p=0.000 n=9+9) RGBA64SetRGBA64-8 6.65ns ± 2% 3.63ns ± 0% -45.35% (p=0.000 n=10+9) NRGBAAt-8 3.72ns ± 1% 3.59ns ± 1% -3.55% (p=0.000 n=10+10) NRGBASetNRGBA-8 4.05ns ± 0% 3.71ns ± 1% -8.57% (p=0.000 n=9+10) NRGBA64At-8 4.99ns ± 1% 3.69ns ± 0% -26.07% (p=0.000 n=10+9) NRGBA64SetNRGBA64-8 6.66ns ± 1% 3.64ns ± 1% -45.40% (p=0.000 n=10+10) AlphaAt-8 1.44ns ± 1% 1.44ns ± 0% ~ (p=0.176 n=10+7) AlphaSetAlpha-8 1.60ns ± 2% 1.56ns ± 0% -2.62% (p=0.000 n=10+6) Alpha16At-8 2.87ns ± 1% 2.92ns ± 2% +1.67% (p=0.001 n=10+10) AlphaSetAlpha16-8 3.26ns ± 1% 3.35ns ± 1% +2.68% (p=0.012 n=8+3) Fixes #14884 Change-Id: Ia0383530596a550e1b1c7aafce5220e5e0935a53 Reviewed-on: https://go-review.googlesource.com/137495Reviewed-by:
Brad Fitzpatrick <bradfitz@golang.org>
b57ccdf9
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.. | ||
color | ||
draw | ||
gif | ||
internal/imageutil | ||
jpeg | ||
png | ||
testdata | ||
decode_example_test.go | ||
decode_test.go | ||
format.go | ||
geom.go | ||
geom_test.go | ||
image.go | ||
image_test.go | ||
names.go | ||
ycbcr.go | ||
ycbcr_test.go |