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-optimized" } */
   3
   4 #include <stdarg.h>
   5 #include <stdlib.h>
   6
   7 #define N 1600
   8 #define DIFF 2558400
   9
  10 int b[N];
  11 int c[N];
  12
  13 /* Reduction of signed-int.  */
  14
  15 __attribute__ ((noinline))
  16 void main1 (int x, int max_result, int min_result)
  17 {
  18   int i;
  19   int diff = 0;
  20   int max = x;
  21   int min = x;
  22
  23   for (i = 0; i < N; i++) {
  24     diff += (b[i] - c[i]);
  25   }
  26
  27   for (i = 0; i < N; i++) {
  28     max = max < c[i] ? c[i] : max;
  29   }
  30
  31   for (i = 0; i < N; i++) {
  32     min = min > c[i] ? c[i] : min;
  33   }
  34
  35   /* check results:  */
  36   if (diff != DIFF)
  37     abort ();
  38   if (max != max_result)
  39     abort ();
  40   if (min != min_result)
  41     abort ();
  42 }
  43
  44  __attribute__((noinline))
  45  void init_arrays ()
  46  {
  47    int i;
  48
  49    b[0] = 1;
  50    c[0] = 1;
  51    for (i=1; i<N; i++)
  52      {
  53        b[i] = i * 3;
  54        c[i] = i;
  55      }
  56 }
  57
  58 int main (void)
  59 {
  60   init_arrays ();
  61   main1 (2000, 2000, 1);
  62   main1 (0, 1599, 0);
  63   return 0;
  64 }
  65
  66 /* { dg-final { scan-tree-dump-times "Detected reduction" 3 "parloops" { xfail *-*-* } } } */
  67 /* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 4 "parloops" { xfail *-*-* } } } */
  68