From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 1/2] lavu/bswap: remove some inline assembler
Date: Tue, 11 Jun 2024 15:15:19 +0200
Message-ID: <20240611131519.GI2821752@pb2> (raw)
In-Reply-To: <20240607181947.330026-1-remi@remlab.net>
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On Fri, Jun 07, 2024 at 09:19:46PM +0300, Rémi Denis-Courmont wrote:
> C code or compiler built-ins are preferable over inline assembler for
> byte-swaps as it allows for better optimisations (e.g. instruction
> scheduling) which would otherwise be impossible.
>
> As with f64c2e710fa1a7b59753224e717f57c48462076f for x86 and Arm,
> this removes the inline assembler on GCC (and Clang) since we now
> require recent enough compiler versions (this indeed seems to work on
> AArch64).
> ---
> libavutil/aarch64/bswap.h | 56 ---------------------------------------
> libavutil/avr32/bswap.h | 44 ------------------------------
> libavutil/bswap.h | 8 +-----
> libavutil/sh4/bswap.h | 48 ---------------------------------
As you are writing that this preferrable for better optimisations
Please provide benchmarks (for sh4, avr32)
thx
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Democracy is the form of government in which you can choose your dictator
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next prev parent reply other threads:[~2024-06-11 13:15 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-07 18:19 Rémi Denis-Courmont
2024-06-07 18:19 ` [FFmpeg-devel] [PATCH 2/2] sh4: remove architecture Rémi Denis-Courmont
2024-06-07 21:18 ` Sean McGovern
2024-06-13 16:35 ` Sean McGovern
2024-06-07 21:17 ` [FFmpeg-devel] [PATCH 1/2] lavu/bswap: remove some inline assembler Sean McGovern
2024-06-11 13:15 ` Michael Niedermayer [this message]
2024-06-11 15:28 ` Rémi Denis-Courmont
2024-06-11 16:04 ` Michael Niedermayer
2024-06-11 16:27 ` Rémi Denis-Courmont
2024-06-11 15:38 ` James Almer
2024-06-11 15:50 ` Tomas Härdin
2024-06-11 16:10 ` Michael Niedermayer
2024-06-11 16:24 ` Rémi Denis-Courmont
2024-06-11 17:20 ` Tomas Härdin
2024-06-11 15:57 ` Michael Niedermayer
2024-06-11 15:59 ` Paul B Mahol
2024-06-11 16:08 ` James Almer
2024-06-11 16:17 ` Michael Niedermayer
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