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FFmpeg/libavcodec
Rémi Denis-Courmont 97d34befea lavc/opusdsp: RISC-V V (256-bit) postfilter
This adds a variant of the postfilter for use with 256-bit vectors.
As a single vector is then large enough to perform the scalar product,
the group multipler is reduced to just one at run-time.

The different vector type is passed via register. Unfortunately,
there is no VSETIVL instruction, so the constant vector size (5) also
needs to be passed via a register.
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