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FFmpeg/libswscale/aarch64

History

Sebastian Pop c3a17ffff6 swscale/aarch64: use multiply accumulate and shift-right narrow ... This patch rewrites the innermost loop of ff_yuv2planeX_8_neon to avoid zips and horizontal adds by using fused multiply adds. The patch also uses ld1r to load one element and replicate it across all lanes of the vector. The patch also improves the clipping code by removing the shift right instructions and performing the shift with the shift-right narrow instructions. I see 8% difference on an m6g instance with neoverse-n1 CPUs: $ ffmpeg -nostats -f lavfi -i testsrc2=4k:d=2 -vf bench=start,scale=1024x1024,bench=stop -f null - before: t:0.014015 avg:0.014096 max:0.015018 min:0.013971 after: t:0.012985 avg:0.013013 max:0.013996 min:0.012818 Tested with `make check` on aarch64-linux. Signed-off-by: Sebastian Pop <spop@amazon.com> Reviewed-by: Clément Bœsch <u@pkh.me> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>		5 years ago
..
Makefile	…
hscale.S	…
output.S	swscale/aarch64: use multiply accumulate and shift-right narrow	5 years ago
swscale.c	…
swscale_unscaled.c	…
yuv2rgb_neon.S	…