[Bug tree-optimization/18694] [4.0 regression] loop miscompilation at -O1 (-ftree-ch)
------- Additional Comments From steven at gcc dot gnu dot org 2004-12-08 22:18 -------
extern int printf (__const char *__restrict __format, ...);
void
divisors_bug(long *t, long e, long P)
{
long j;
long *d, *old_d, *act_d, *tmp;
d = t;
*++d = 5;
old_d = t;
for (j = e; j; j--)
{
act_d = d;
tmp = old_d;
while (tmp < act_d)
*++d = *(++tmp);
old_d=act_d;
}
}
int main(void)
{
long t[4];
long i;
divisors_bug(t,2,2);
for(i=1;i<4;i++)
printf("%ld ",t[i]);
printf("\n");
return 0;
}
Expected output: 5 5 5
Output with -O1: 5 5 garbage
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18694
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