gcc/testsuite/gcc.dg/autopar/reduc-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -ftree-parallelize-loops=4 -fdump-tree-parloops-details -fdump-tree-final_cleanup" } */
   3
   4 #include <stdarg.h>
   5 #include <stdlib.h>
   6
   7 #define N 16
   8 #define DIFF 240
   9
  10 /* Reduction of signed-int.  */
  11
  12 __attribute__ ((noinline))
  13 void main1 (int x, int max_result, int min_result)
  14 {
  15   int i;
  16   int b[N] = {1,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
  17   int c[N] = {1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
  18   int diff = 0;
  19   int max = x;
  20   int min = x;
  21
  22   for (i = 0; i < N; i++) {
  23     diff += (b[i] - c[i]);
  24   }
  25
  26   for (i = 0; i < N; i++) {
  27     max = max < c[i] ? c[i] : max;
  28   }
  29
  30   for (i = 0; i < N; i++) {
  31     min = min > c[i] ? c[i] : min;
  32   }
  33
  34   /* check results:  */
  35   if (diff != DIFF)
  36     abort ();
  37   if (max != max_result)
  38     abort ();
  39   if (min != min_result)
  40     abort ();
  41 }
  42
  43 int main (void)
  44 {
  45   main1 (100, 100, 1);
  46   main1 (0, 15, 0);
  47   return 0;
  48 }
  49
  50 /* { dg-final { scan-tree-dump-times "Detected reduction" 3 "parloops" } } */
  51 /* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 3 "parloops" } } */
  52 /* { dg-final { cleanup-tree-dump "parloops" } } */
  53 /* { dg-final { cleanup-tree-dump "final_cleanup" } } */
  54