gcc/testsuite/gcc.dg/autopar/uns-outer-4.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -ftree-parallelize-loops=4 -fdump-tree-parloops-details -fdump-tree-optimized" } */
   3
   4 void abort (void);
   5
   6 unsigned int g_sum=0;
   7 unsigned int x[500][500];
   8
   9 void
  10 parloop (int N)
  11 {
  12   int i, j;
  13   unsigned int sum;
  14
  15   /* Double reduction is detected, outer loop is parallelized.  */
  16   sum = 0;
  17   for (i = 0; i < N; i++)
  18     for (j = 0; j < N; j++)
  19       sum += x[i][j];
  20
  21   g_sum = sum;
  22 }
  23
  24 /* { dg-final { scan-tree-dump-times "parallelizing outer loop" 1 "parloops" } } */
  25 /* { dg-final { scan-tree-dump-times "loopfn" 4 "optimized" } } */