Re: [FFmpeg-devel] [PATCH] avutil/mem: always align by at least 32 bytes

From: James Almer <jamrial@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH] avutil/mem: always align by at least 32 bytes
Date: Wed, 6 Dec 2023 09:54:35 -0300
Message-ID: <e5590010-864d-4e86-a973-69257a86d861@gmail.com> (raw)
In-Reply-To: <CAEEMt2kc5rXfyPJf7GiCEGUiDmWRGO9tRkBj88BJ5mrx89_mwQ@mail.gmail.com>

On 12/6/2023 9:50 AM, Ronald S. Bultje wrote:
> Hi,
> 
> On Sun, Dec 3, 2023 at 3:10 PM Timo Rothenpieler <timo@rothenpieler.org>
> wrote:
> 
>> So if the compiler does a copy
>> in decode_cpe() with avx instructions, but ffmpeg is built with
>> --disable-avx
>>
> 
> Ehm... What? That seems like the core bug then?

--disable-avx will disable any ffmpeg specific AVX dsp function that 
depends on HAVE_AVX_EXTERNAL and similar, but will not do anything to 
the -march argument you can pass the compiler with the --cpu configure 
option.

configure --cpu=haswell --disable-avx is completely valid.

> 
> Ronald
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