Optimize SSE2 opaque blend
Backport optimization from https://codereview.chromium.org/874863002/.
Microbenchmarks data compared to previous SSE2 implementation:
bitmap_BGRA_8888_A_source_stripes_three 7.52us -> 8.67us 1.15x
bitmap_BGRA_8888_A_source_stripes_two 7.48us -> 8.56us 1.15x
bitmap_BGRA_8888_update_scale_rotate_bilerp 63.4us -> 64us 1.01x
bitmap_BGRA_8888_update_volatile 3.31us -> 3.33us 1.01x
bitmap_BGRA_8888_scale 11.1us -> 11.2us 1x
bitmap_BGRA_8888_scale_bilerp 35.8us -> 35.9us 1x
bitmap_BGRA_8888 3.33us -> 3.33us 1x
bitmap_BGRA_8888_A_scale_rotate_bicubic 66.7us -> 66.5us 1x
bitmap_BGRA_8888_update_volatile_scale_rotate_bilerp 65.1us -> 64us 0.98x
bitmap_BGRA_8888_scale_rotate_bilerp 65.1us -> 64us 0.98x
bitmap_BGRA_8888_A_scale_bicubic 30.6us -> 29.9us 0.98x
bitmap_BGRA_8888_A_scale_bilerp 42.7us -> 41.4us 0.97x
bitmap_BGRA_8888_A_scale_rotate_bilerp 71us -> 67.7us 0.95x
bitmap_BGRA_8888_A 7.44us -> 5.7us 0.77x
bitmap_BGRA_8888_A_source_opaque 7.46us -> 3.72us 0.5x
bitmap_BGRA_8888_A_source_transparent 7.46us -> 1.96us 0.26x
BUG=skia:
Review URL: https://codereview.chromium.org/886403002
1 file changed