From: Lynne <dev@lynne.ee>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 1/3] riscv: add CPU flags for the RISC-V Vector extension
Date: Sat, 3 Sep 2022 23:38:32 +0200 (CEST)
Message-ID: <NB4Hc1H--3-2@lynne.ee> (raw)
In-Reply-To: <2194093.iZASKD2KPV@basile.remlab.net>
Sep 3, 2022, 21:59 by remi@remlab.net:
> Le lauantaina 3. syyskuuta 2022, 22.20.20 EEST Lynne a écrit :
>
>> Sep 3, 2022, 21:01 by remi@remlab.net:
>> > From: Rémi Denis-Courmont <remi@remlab.net>
>> >
>> > RVV defines a total of 12 different extensions: V, Zvl32b, Zvl64b,
>> > Zvl128b, Zvl256b, Zvl512b, Zvl1024b, Zve32x, Zve32f, Zve64x, Zve64f and
>> > Zve64d.
>> >
>> > At this stage, we don't care about the vector length extensions Zvl*,
>> > as most or all optimisations will be running in a loop that is
>> > independent on the data set size.
>>
>> I need to know the maximum length to write an FFT.
>> Could you add flags for it?
>>
>
> I think we should cross that bridge if/when the need actually arises. In most
> cases, the vector length returned at run-time from VSETVL is good enough.
>
I need to know the length in C, not assembly. Whilst you're at adding
initial support, I think it makes sense to support all code that's targetting
RISC-V, not just the ones it's convenient to. I'll probably write the FFT
as soon as I get access to a real machine.
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next prev parent reply other threads:[~2022-09-03 21:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-03 19:01 [FFmpeg-devel] [PATCHv1 0/3] Float DSP for RISC-V Vector extension - part I Rémi Denis-Courmont
2022-09-03 19:01 ` [FFmpeg-devel] [PATCH 1/3] riscv: add CPU flags for the RISC-V Vector extension remi
2022-09-03 19:05 ` Rémi Denis-Courmont
2022-09-03 19:20 ` Lynne
2022-09-03 19:59 ` Rémi Denis-Courmont
2022-09-03 21:38 ` Lynne [this message]
2022-09-04 5:41 ` Rémi Denis-Courmont
2022-09-04 6:39 ` Lynne
2022-09-04 8:27 ` Rémi Denis-Courmont
2022-09-03 19:01 ` [FFmpeg-devel] [PATCH 2/3] riscv: initial common header for assembler macros remi
2022-09-03 19:01 ` [FFmpeg-devel] [PATCH 3/3] riscv: add float vector-scalar multiplication remi
2022-09-03 19:11 ` Lynne
2022-09-03 19:34 ` Rémi Denis-Courmont
2022-09-03 19:48 ` Lynne
2022-09-03 20:01 ` Rémi Denis-Courmont
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