------- Comment #1 from rguenth at gcc dot gnu dot org 2010-07-04 15:00 -------
I have analyzed this already. The problem is that
struct QMapData
{
QBasicAtomicInt ref;
static QMapData shared_null;
};
the static QMapData shared_null has DECL_ALIGN of 8 bits. So we end up passing
an unaligned shared_null.ref._q_value as operand to
__asm__ ("": "=m" (_q_value): :);
which doesn't work.
This is exposed by the mem-ref2 merge as previously we did not see the
shared_null decl (and thus its bogus alignment) here but instead referenced
via a pointer which got proper natural alignment from its type.
Thus, this is a C++ frontend bug.
CCing Jason.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu dot org
Status|UNCONFIRMED |NEW
Component|inline-asm |c++
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2010-07-04 15:00:43
date| |
Target Milestone|--- |4.6.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44810
