[FFmpeg-devel] [Ffmpeg-devel] [PATCH] detect support for 10 operands in configure

[Alexander Strange]

On Feb 10, 2009, at 11:59 AM, M?ns Rullg?rd wrote:

> Loren Merritt <lorenm at u.washington.edu> writes:
>
>> On Mon, 9 Feb 2009, M?ns Rullg?rd wrote:
>>> Loren Merritt <lorenm at u.washington.edu> writes:
>>>
>>>> +        :"+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x),  
>>>> "+&rm"(x)
>>>
>>> Does & make a difference with +?
>>
>> Shouldn't matter as long as there are no input-only operands.
>
> And in the general case?

+& expands into a =& output and a normal input, so it doesn't matter.  
I'm surprised that asm works, though, having more than one output to  
the same place obviously makes no sense.