Re: [FFmpeg-devel] [PATCH v3 1/9] lavc/vp9dsp: R-V ipred vert

[flow gg <hlefthleft@gmail.com>]

Okay, learned it

Rémi Denis-Courmont <remi@remlab.net> 于2024年5月15日周三 01:00写道：

> Le tiistaina 14. toukokuuta 2024, 7.45.29 EEST flow gg a écrit :
> > I am locally using:
> >     if (bpp == 8 && (flags & AV_CPU_FLAG_RVI) && (flags &
> > AV_CPU_FLAG_RVB_ADDR)) {
>
> There is no point testing the I flag if you test any other flag. The I
> flag is
> always set (since we don't, and probably never will, support RV32E) and
> only
> exists for the benefit of checkasm.
>
> > this performs better on k230/banana_f3 than C.
>
> It also performs better than C on SiFive U74, even though that design has
> veeeeeery slow unaligned access (emulated in SBI). Of course, it could
> just be
> that checkasm only tests aligned accesses and unaligned accesses are
> legal,
> hence my earlier question.
>
> --
> レミ・デニ-クールモン
> http://www.remlab.net/
>
>
>
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