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From: Hao Chen <chenhao@loongson.cn>
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Subject: [FFmpeg-devel] Optimize Mpeg4 decoding for loongarch.
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./ffmpeg -i 8_mpeg4_1080p_24fps_12Mbps.avi -f rawvideo -y /dev/null -an
before:376fps
after :552fps

avcodec: [loongarch] Optimize hpeldsp with LASX.
avcodec: [loongarch] Optimize idctdstp with LASX.
avcodec: [loongarch] Optimize prefetch with loongarch.

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