[FFmpeg-devel] [PATCHv2 0/10] RISC-V V floating point DSP

[Lynne]

Sep 4, 2022, 15:54 by remi at remlab.net:

> The following changes since commit b6e8fc1c201d58672639134a737137e1ba7b55fe:
>
>  avcodec/speexdec: improve support for speex in non-ogg (2022-09-04 11:31:57 +0200)
>
> are waiting thorough bashing at your express convenience up to:
>
>  riscv: float vector dot product with RVV (2022-09-04 16:45:38 +0300)
>
> Changes since v1:
>
> - Removed stray define.
> - Fixed mismatch between byte and element size in mul-scalar.
> - Added fmul, fac, dmul, dmac, fmul-add, fmul-reverse, fmul-window.
> - Added float butterfly and dot product.
>
> All operations are unrolled to the maximum group size (8), with the
> exception of overlap/add. The later seems to require a minimum of 6
> vectors (maybe 5 by extremely careful ordering), so the group size is
> only 4.
>
> The pointer arithmetic could be slightly optimised with SH2ADD and
> SH3ADD instructions from the Zvba extension. This would require more
> conditional code, or requiring support for Zvba for probably neglible
> performance gains though.
>

Did you test on real hardware or a VM?
If the former, what does checkasm --bench report?