gcc/testsuite/gcc.dg/autopar/reduc-2char.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 121
   9
  10 __attribute__ ((noinline))
  11 void main1 (signed char x, signed char max_result, signed char min_result)
  12 {
  13   int i;
  14   signed char b[N] = {1,2,3,6,8,10,12,14,16,18,20,22,24,26,28,30};
  15   signed char c[N] = {1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
  16   signed char diff = 2;
  17   signed char max = x;
  18   signed char min = x;
  19
  20   for (i = 0; i < N; i++) {
  21     diff += (signed char)(b[i] - c[i]);
  22   }
  23
  24   for (i = 0; i < N; i++) {
  25     max = max < c[i] ? c[i] : max;
  26   }
  27
  28   for (i = 0; i < N; i++) {
  29     min = min > c[i] ? c[i] : min;
  30   }
  31
  32   /* check results:  */
  33   if (diff != DIFF)
  34     abort ();
  35   if (max != max_result)
  36     abort ();
  37   if (min != min_result)
  38     abort ();
  39 }
  40
  41 int main (void)
  42 {
  43   main1 (100, 100, 1);
  44   main1 (0, 15, 0);
  45   return 0;
  46 }
  47
  48 /* { dg-final { scan-tree-dump-times "Detected reduction" 2 "parloops" } } */
  49 /* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 2 "parloops" } } */
  50 /* { dg-final { cleanup-tree-dump "parloops" } } */
  51 /* { dg-final { cleanup-tree-dump "final_cleanup" } } */
  52
  53