1 /* { dg-do compile } */
2 /* { dg-options "-O3 -fdump-tree-local-pure-const1 -fdump-tree-optimized" } */
3 static __attribute__ ((noinline, noclone))
i_am_pure(char * c,int n)4 int i_am_pure(char *c, int n)
5 {
6   char *d=__builtin_alloca (n);
7   int i;
8   int sum;
9   for (i=0;i<n;i++)
10     d[i] = c[i];
11   for (i=0;i<n;i++)
12     d[i] *= c[n-i];
13   for (i=0;i<n;i++)
14     sum+=d[i];
15   if (sum)
16     __builtin_unreachable ();
17   return sum;
18 }
19 char array[11];
20 int
main(void)21 main(void)
22 {
23   i_am_pure (array,5);
24   i_am_pure (array,11);
25   return 0;
26 }
27 /* { dg-final { scan-tree-dump "found to be pure: i_am_pure" "local-pure-const1"} } */
28 /* { dg-final { scan-tree-dump-not "i_am_pure" "optimized"} } */
29 /* { dg-final { cleanup-tree-dump "local-pure-const1" } } */
30 /* { dg-final { cleanup-tree-dump "optimized" } } */
31