On Tue, May 06, 2014 at 10:14:42AM +0200, Jakub Jelinek wrote:
> > Hmm, but isn't TYPE_ALIGN_UNIT wrong then?
>
> No, after all, you don't want to change __alignof__ (long long), that is
> pretty essential part of ABI.
Yeah, as I understand things, for x86_64 __alignof__ (T) returns
*preferred* alignment which is specified for each type in the ABI
(Figure 3.1: Scalar Types), and is the same as sizeof (T). But
_Alignof (T) (thus also _Alignas (T)) is the *least* alignment for
a type -- and they can differ if the type is in a struct/union.
Please correct me if I'm mistaken.
Marek
