Re: [PATCH] c-family: Check backend for argument alignment on stack

[H.J. Lu]

On Mon, Jun 30, 2025 at 10:36 PM Jason Merrill <ja...@redhat.com> wrote:
>
> On 6/28/25 7:00 AM, H.J. Lu wrote:
> > Since a backend may ignore user type alignment for arguments passed on
> > stack, check backend for argument alignment on stack when evaluating
> > __alignof.
>
> I assume that's reflected in DECL_ALIGN, so could we just add PARM_DECL to

No.  targetm.calls.function_arg_boundary may have special handling for it.

> >   else if (VAR_OR_FUNCTION_DECL_P (expr))
> >     t = size_int (DECL_ALIGN_UNIT (expr));
>
> ?
>
> Jason
>


-- 
H.J.