This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: gimple va_arg for arm
On Wed, 2004-07-14 at 18:38, Richard Henderson wrote:
> On Wed, Jul 14, 2004 at 06:33:59PM +0100, Richard Earnshaw wrote:
> > On Thu, 2004-07-08 at 23:11, Richard Henderson wrote:
> > > Not committed, since I'm not 100% certain about the curiousness with
> > > the alignment of arg_pointer_rtx. It seems to me that if it's necessary
> > > to reduce the alignment for va_arg, then its necessary all of the time.
> >
> > Not necessarily. The ABI is perfectly entitled to say that arguments to
> > a variadic function are marshaled in different way to non-variadic
> > function.
>
> The question was not about marshalling, but about the alignment
> of arg_pointer_rtx.
Which is derived from SP on entry to a function...
So in the AAPCS (and the ATPCS) it must always be double-word aligned,
and in the APCS it was always word aligned.
R.