gcc/testsuite/gcc.dg/autopar/outer-5.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   /* Inner cycle is currently not supported, outer loop is not
  23      parallelized.  Inner reduction is detected, inner loop is
  24      parallelized.  */
  25   for (i = 0; i < N; i++)
  26   {
  27     sum = 0;
  28     for (j = 0; j < N; j++)
  29       sum += x[i][j];
  30     y[i]=sum;
  31   }
  32   g_sum = sum;
  33 }
  34
  35 int 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" 0 "parloops" } } */
  50 /* { dg-final { scan-tree-dump-times "parallelizing inner loop" 1 "parloops" } } */
  51 /* { dg-final { cleanup-tree-dump "parloops" } } */
  52 /* { dg-final { cleanup-tree-dump "optimized" } } */