On Wed, 11 Apr 2018, Jason Merrill wrote: > On Tue, Apr 10, 2018 at 1:12 PM, Jason Merrill <ja...@redhat.com> wrote: > > But really this is beside the point: the x86 ABI says that the > > alignment of double is 4, so alignof(double) should be 4 regardless of > > what GCC wants to do internally. And I think the same is true of > > __alignof__. > > Particularly since the description of __alignof__ has been clarified: > > "Some machines never actually require alignment; they allow reference > to any data type even at an odd address. For these machines, > '__alignof__' reports the smallest alignment that GCC gives the data > type, usually as mandated by the target ABI."
That text seems inaccurate in the x86 double / long long case; it should reflect the preferred alignment of the type for a standalone object. -- Joseph S. Myers jos...@codesourcery.com
