gcc/testsuite/gcc.dg/autopar/uns-outer-6.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -ftree-parallelize-loops=4 -fdump-tree-parloops2-details -fdump-tree-optimized" } */
   3
   4 void abort (void);
   5
   6 unsigned int x[500][500];
   7 unsigned int y[500];
   8 unsigned int g_sum=0;
   9
  10
  11 void __attribute__((noinline))
  12 init (int i, int j)
  13 {
  14   x[i][j]=1;
  15 }
  16
  17 void __attribute__((noinline))
  18 parloop (int N)
  19 {
  20   int i, j;
  21   unsigned int sum;
  22
  23   /* Outer loop reduction, outerloop is parallelized.  */
  24   sum=0;
  25   for (i = 0; i < N; i++)
  26     {
  27       for (j = 0; j < N; j++)
  28         y[i] += x[i][j];
  29       sum += y[i];
  30     }
  31   g_sum = sum;
  32 }
  33
  34 int
  35 main (void)
  36 {
  37   int i, j;
  38   for (i = 0; i < 500; i++)
  39     for (j = 0; j < 500; j++)
  40       init (i, j);
  41
  42   parloop (500);
  43
  44   return 0;
  45 }
  46
  47
  48 /* Check that outer loop is parallelized.  */
  49 /* { dg-final { scan-tree-dump-times "parallelizing outer loop" 1 "parloops2" } } */
  50 /* { dg-final { scan-tree-dump-times "parallelizing inner loop" 0 "parloops2" } } */
  51 /* { dg-final { scan-tree-dump-times "loopfn" 4 "optimized" } } */