need volatile for asm?

[David Brown]

On 16/02/2011 11:59, Andi Hellmund wrote:
>  > Would this be portable check, guaranteeing that compilation on other
>  > machine with other gcc version will not do opposite ?
>
> You are right, this is definitely NOT portable
>
>> And anyway, why not always putting it to volatile ? Once you started
>> embedding asm code, I guess you had a good reason for it to appear in
>> the output code...
>
> Good point.
>

There are certainly times when you want to use embedded assembly, but 
don't always want it to appear on the output code - then gcc's ability 
to optimise and rearrange inline assembly is very nice.  But this isn't 
one of the cases :-)