On Tue, Mar 16, 2021 at 10:29 AM Jakub Jelinek <ja...@redhat.com> wrote:
>
> On Tue, Mar 16, 2021 at 09:46:33AM +0100, Richard Biener wrote:
> > > shows we have an interface problem here -- we shouldn't need something
> > > this
> > > convoluted to walk through an argument list. But that's not your problem
> > > or a problem with the patch.
> >
> > The caller side should IMHO always look at TYPE_ARG_TYPES since
> > that's what determines the ABI. But IIRC there were problems in the past
> > that TYPE_ARG_TYPES might be NULL but DECL_ARGUMENTS not?!
>
> Yes, for the K&R definitions
> #pragma omp declare simd
> int
> foo (a, b, c)
> int a, b, c;
> {
> return a + b + c;
> }
The C frontend could still populate TYPE_ARG_TYPES here, OTOH IIRC
K&R definitions work like unprototyped functions on the caller side, thus
having varargs argument passing semantics?
> Jakub
>
