gcc/testsuite/gcc.dg/autopar/reduc-1char.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 242
   9
  10 unsigned char ub[N] = {1,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
  11 unsigned char uc[N] = {1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
  12
  13 __attribute__ ((noinline)) void
  14 main1 (unsigned char x, unsigned char max_result, unsigned char min_result)
  15 {
  16   int i;
  17   unsigned char udiff = 2;
  18   unsigned char umax = x;
  19   unsigned char umin = x;
  20
  21   for (i = 0; i < N; i++) {
  22     udiff += (unsigned char)(ub[i] - uc[i]);
  23   }
  24
  25   for (i = 0; i < N; i++) {
  26     umax = umax < uc[i] ? uc[i] : umax;
  27   }
  28
  29   for (i = 0; i < N; i++) {
  30     umin = umin > uc[i] ? uc[i] : umin;
  31   }
  32
  33   /* check results:  */
  34   if (udiff != DIFF)
  35     abort ();
  36   if (umax != max_result)
  37     abort ();
  38   if (umin != min_result)
  39     abort ();
  40 }
  41
  42  __attribute__((noinline))
  43  void init_arrays ()
  44  {
  45    int i;
  46
  47    for (i=16; i<N; i++)
  48      {
  49        ub[i] = 1;
  50        uc[i] = 1;
  51      }
  52 }
  53
  54 int main (void)
  55 {
  56   init_arrays();
  57   main1 (100, 100, 1);
  58   main1 (0, 15, 0);
  59   return 0;
  60 }
  61
  62
  63 /* { dg-final { scan-tree-dump-times "Detected reduction" 3 "parloops2" } } */
  64 /* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 4 "parloops2" } } */
  65