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[Bug c/54188] Inconsistent __alignof__(long long)
- From: "joseph at codesourcery dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 08 Aug 2012 21:43:18 +0000
- Subject: [Bug c/54188] Inconsistent __alignof__(long long)
- Auto-submitted: auto-generated
- References: <bug-54188-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54188
--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-08-08 21:43:18 UTC ---
On Wed, 8 Aug 2012, rth at gcc dot gnu.org wrote:
> > N1370 (C11 draft) 6.5.3.4 paragraph 3 says:
> >
> > The _Alignof operator yields the alignment requirement of its
> > operand type.
>
> Does that imply that an i386 host should return 1 for most types,
> simply because it *can* allow unaligned accesses?
Alignment requirements are defined in terms of "addresses at which objects
of that type may be allocated", not in terms of what might happen with a
pointer dereference.