------- Comment #3 from jakub at gcc dot gnu dot org 2007-12-17 15:08 -------
C testcase:
extern void abort (void);
extern void *memset (void *s, int c, __SIZE_TYPE__ n);
struct S
{
char s[25];
};
void __attribute__((noinline))
foo (struct S *x)
{
int i;
for (i = 0; i < sizeof (x->s); ++i)
if (x->s[i] != 0)
abort ();
}
int
main ()
{
struct S a;
memset (&a.s, '\0', sizeof (a.s));
foo (&a);
struct S b = a;
b = b;
foo (&b);
return 0;
}
Weird that nothing removed the noop move earlier, shouldn't that be a job at
least for DCE?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34459
