On 7/1/25 5:36 PM, H.J. Lu wrote:
On Tue, Jul 1, 2025 at 9:37 PM Jason Merrill <ja...@redhat.com> wrote:
On 6/30/25 7:03 PM, H.J. Lu wrote:
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.
Why wouldn't we adjust DECL_ALIGN of the PARM_DECL to reflect the actual
alignment of the argument? Are you saying it could be different from
one call to another?
Function argument alignment is different from other places in memory if
the main variant type alignment is different:
Yes, I understand that function parameter alignment can be different
from other objects of that type.
But since we have a PARM_DECL to represent that particular function
parameter, it seems natural to represent that difference in the
DECL_ALIGN of the PARM_DECL. If you don't, its DECL_ALIGN is wrong.
Jason
