in libbid we have
typedef __attribute__((aligned(16)))
struct {
unsigned long long w[3];
} UINT192;
UINT192 bid_Kx192[32];
thus we request 16-byte alignment for UINT192 (whose elements add
up to a size of 24). Now the array ends up with elements of size 24
and thus the elements are _not_ aligned to a 16-byte boundary, still
the element type is not adjusted to reflect that leading to inconsistencies
when one for example tries to set operand 3 of an ARRAY_REF
(which is specified in units of the alignment of the element).
This causes PR43783.
This is also at least a documentation bug as I can't find anything
that documents the above behavior.
--
Summary: attribute((aligned(x))) not honored for array element
types?
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Keywords: wrong-code, documentation
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rguenth at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43798
