This is the mail archive of the
libc-alpha@sourceware.org
mailing list for the glibc project.
Re: PATCH: Add x32 pthread types
> On Mon, May 14, 2012 at 11:22 AM, Roland McGrath <roland@hack.frob.com> wrote:
> > I think your intent is (and should be) to make the x32 layouts
> > exactly match the x86_64 ones for these types. ?Is that right?
> >
> > There are numerous occurrences of 'long int' in this file.
> > So some sizes and alignments won't match without further changes.
>
> Since those structs have pointer fields, x32 ones won't have the
> same lay out as x86-64 unless we pad it. Also long int is OK.
> I don't believe x32 must have the same layout in memory as
> x86-64.
It looks like the x86_64 formats took some pains to get 8-byte alignment
even on ones that don't have any 8-byte-wide fields. I wonder if that
might be relevant for performance on x32 as well.
Thanks,
Roland