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/* { dg-do compile } */

/* { dg-options "-O2 -ftree-parallelize-loops=4 -fdump-tree-parloops-details -fdump-tree-optimized" } */

#include <stdlib.h>

#include <stdio.h>

int main()

{

  unsigned int x, y, idx, H = 1024, W = 1024;

  int * tmps = (int *)malloc(H*W*sizeof(int));

  /* This loop gets parallelized even though output dependences exist

     between writes to 'tmps' that prevent parallelization.

     For example: tmps[1] = 1, ..., tmps[1] = 17.  */

  for(x = 1; x < H; x++)

    {

      for(y = 1; y < W; y++)

        {

          idx = x*W+y;

          tmps[idx % 4096] = idx;

        }

    }

  for(x = 1; x < 8; x++)

    printf("tmps[%d]=%d\n", x, tmps[x]);

  return 0;

}

/* Check that no loop gets parallelized.  */

/* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 0 "parloops" } } */

/* { dg-final { scan-tree-dump-times "loopfn" 0 "optimized" } } */

/* { dg-final { cleanup-tree-dump "parloops" } } */

/* { dg-final { cleanup-tree-dump "optimized" } } */