1 /* { dg-do compile } */
2 /* { dg-options "-O2 -ftree-parallelize-loops=4 -fdump-tree-parloops2-details -fdump-tree-optimized" } */
3 
4 #include <stdarg.h>
5 #include <stdlib.h>
6 
7 #define N 1600
8 
9 unsigned int ub[N];
10 unsigned int uc[N];
11 
12 /* Reduction of unsigned-int.  */
13 
14 __attribute__ ((noinline))
main1(int n,int res)15 int main1 (int n, int res)
16 {
17   int i;
18   unsigned int udiff;
19 
20   udiff = 0;
21   for (i = 0; i < n; i++) {
22     udiff += (ub[i] - uc[i]);
23   }
24 
25   /* check results:  */
26   if (udiff != res)
27     abort ();
28 
29   return 0;
30 }
31 
32 __attribute__((noinline))
init_arrays()33 void init_arrays ()
34 {
35   int i;
36 
37   for (i=0; i<N; i++)
38     {
39       ub[i] = i * 3;
40       uc[i] = i;
41     }
42 }
43 
main(void)44 int main (void)
45 {
46   init_arrays ();
47   main1 (N, 2558400);
48   main1 (N-1, 2555202);
49   return 0;
50 }
51 
52 
53 /* { dg-final { scan-tree-dump-times "Detected reduction" 1 "parloops2" } } */
54 /* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 2 "parloops2" } } */
55 
56