Re: [FFmpeg-devel] [PATCH] libavfilter/af_afir: R-V V dcmul_add

[flow gg <hlefthleft@gmail.com>]

It's at c908

According to the benchmark results, if vlseg2e64 is used, the speed is
almost as slow as C language (dcmul_add_rvv_f64: 86.2), if vsseg2e64 is
used, it will be only a bit slower (dcmul_add_rvv_f64: 50.2).

Rémi Denis-Courmont <remi@remlab.net> 于2023年12月22日周五 04:52写道：

> Le tiistaina 19. joulukuuta 2023, 4.53.12 EET flow gg a écrit :
> > c908:
> > dcmul_add_c: 88.0
> > dcmul_add_rvv_f64: 46.2
> >
> > Did not use vlseg2e64, because it is much slower than vlse64
> > Did not use vsseg2e64, because it is slightly slower than vsse64
>
> Is this about C910 or C908? I have not checked this specific function, but
> the
> general understanding for C908 has been the exact opposite so far, i.e.
> segmented accesses are fast, while strided accesses are (unsurprisingly)
> slow.
>
> See also
> https://camel-cdr.github.io/rvv-bench-results/canmv_k230/index.html
>
> --
> レミ・デニ-クールモン
> http://www.remlab.net/
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>
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