https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70445
Bug ID: 70445
Summary: Incorrect C++ member alignment
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
[hjl@gnu-ivb-1 gcc]$ cat /tmp/a.ii
typedef struct xxx
{
unsigned long long a1;
unsigned long long a2;
unsigned long long a3;
unsigned long long a4;
} xxx;
typedef struct Foo
{
xxx foo;
} Foo;
extern xxx b;
Foo y;
void
foo (void)
{
b = y.foo;
}
[hjl@gnu-ivb-1 gcc]$ ./xgcc -B./ -S -O2 -da /tmp/a.ii
[hjl@gnu-ivb-1 gcc]$ cp /tmp/a.ii /tmp/c.i
[hjl@gnu-ivb-1 gcc]$ ./xgcc -B./ -S -O2 -da /tmp/c.i
[hjl@gnu-ivb-1 gcc]$ grep A128 c.i.213r.expand
[hjl@gnu-ivb-1 gcc]$ grep A128 a.ii.213r.expand
(mem/c:DI (reg/f:DI 96) [1 y.foo+16 S8 A128])) /tmp/a.ii:20 -1
^^^^^ Where dos it come from?
(mem/c:DI (reg/f:DI 96) [1 y.foo+16 S8 A128])) /tmp/a.ii:20 -1
[hjl@gnu-ivb-1 gcc]$
