avcodec: [loongarch] Optimize prefetch with loongarch

Multimedia / FFmpeg - gxw [loongson.cn] - 4 January 2022 14:55 UTC

./ffmpeg -i ../1_h264_1080p_30fps_3Mbps.mp4 -f rawvideo -y /dev/null -an before:296 after :308

8ca7d474c1 avcodec: [loongarch] Optimize prefetch with loongarch.
libavcodec/loongarch/Makefile | 1 +
libavcodec/loongarch/videodsp_init.c | 45 ++++++++++++++++++++++++++++++++++++
libavcodec/videodsp.c | 2 ++
libavcodec/videodsp.h | 1 +
4 files changed, 49 insertions(+)

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