gcc/testsuite/gcc.dg/autopar/reduc-1.c

   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  #define DIFF 2558402
   9
  10 unsigned int ub[N];
  11 unsigned int uc[N];
  12
  13  /* Reduction of unsigned-int.  */
  14
  15  void main1 (unsigned int x, unsigned int max_result, unsigned int min_result)
  16  {
  17    int i;
  18    unsigned int udiff = 2;
  19    unsigned int umax = x;
  20    unsigned int umin = x;
  21
  22    /* Summation.  */
  23    for (i = 0; i < N; i++) {
  24      udiff += (ub[i] - uc[i]);
  25    }
  26
  27    /* Maximum.  */
  28    for (i = 0; i < N; i++) {
  29      umax = umax < uc[i] ? uc[i] : umax;
  30    }
  31
  32    /* Minimum.  */
  33    for (i = 0; i < N; i++) {
  34      umin = umin > uc[i] ? uc[i] : umin;
  35    }
  36
  37    /* check results:  */
  38    if (udiff != DIFF)
  39      abort ();
  40    if (umax != max_result)
  41      abort ();
  42    if (umin != min_result)
  43      abort ();
  44  }
  45
  46  __attribute__((noinline))
  47  void init_arrays ()
  48  {
  49    int i;
  50
  51    ub[0] = 1;
  52    uc[0] = 1;
  53    for (i=1; i<N; i++)
  54      {
  55        ub[i] = i * 3;
  56        uc[i] = i;
  57      }
  58 }
  59
  60 int main (void)
  61 {
  62   init_arrays ();
  63   main1 (2000, 2000, 1);
  64   main1 (0, 1599, 0);
  65   return 0;
  66 }
  67
  68
  69 /* { dg-final { scan-tree-dump-times "Detected reduction" 3 "parloops2" } } */
  70 /* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 4 "parloops2" } } */
  71