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Using the dot-product instructions here allows us to avoid needing LD4
for loading individual colour channels, which gives a big benefit on
some micro-architectures where such instructions perform significantly
worse than LD1. In addition the dot-product instructions have higher
throughput compared to the Neon
Observed reduction in runtimes for selected kernels moving from *_NEON
to *_NEON_DotProd:
Kernel | Cortex-A55 | Cortex-A510 | Cortex-A76 | Cortex-X2
ABGRToYJRow | -6.5% | -22.5% | -43.5% | -71.2%
ABGRToYRow | -6.5% | -22.5% | -43.5% | -68.3%
ARGBToYJRow | -6.5% | -22.5% | -43.5% | -68.1%
ARGBToYRow | -6.5% | -22.5% | -43.5% | -68.1%
BGRAToYRow | -6.5% | -22.5% | -42.3% | -68.4%
RGBAToYJRow | -6.5% | -22.5% | -42.2% | -73.7%
RGBAToYRow | -6.5% | -22.5% | -42.3% | -64.9%
Bug: libyuv:977
Change-Id: If244190a7bdacf7e6e6b16af7e6853ee13ff6585
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/5424737
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
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