who owns stack args?

[Jeff Law]

On 02/24/2016 01:42 PM, Alexander Monakov wrote:
> On Wed, 24 Feb 2016, DJ Delorie wrote:
>> The real question is: are stack arguments call-clobbered or
>> call-preserved?  Does the answer depend on the "pure" attribute?
>
> Stack area holding stack arguments should belong to the callee for tail-calls
> to work (the callee will trash that area when laying out arguments for the
> tail call; thanks to Rich Felker for pointing that out to me).
>
> Thus it cannot depend on attribute-pure.
Which would imply that the outgoing argument stack slots must always be 
considered clobbered by a call.

FWIW, I'm fine with that interpretation ;-)

jeff