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