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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" } } */
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