1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
/**
* Test the outer loop parallelization using the implicit loop barriers
* added by pocl.
*
* The barrier should be inserted inside a barrierless loop in case pocl
* can analyze it's safe to do so. The cases are tested here.
*/
__kernel void
test_kernel (void)
{
int gid = get_global_id (0);
int lid = get_local_id (0);
if (lid == 0)
printf ("vertical:\n");
/* This loop cannot be horizontally vectorized by the implicit loop barrier
mechanism because of an iteration count that depends on the gid. */
for (int i = 0; i < gid; ++i) {
printf ("i: %d gid: %d\n", i, gid);
}
barrier(CLK_GLOBAL_MEM_FENCE);
if (lid == 0)
printf ("horizontal:\n");
/* This loop should be horizontally vectorized because the iteration count
does not depend on the gid.*/
for (int i = 0; i < get_local_size(0); ++i) {
if (i < 4)
printf ("i: %d gid: %d\n", i, gid);
}
barrier(CLK_GLOBAL_MEM_FENCE);
if (lid == 0)
printf ("vertical:\n");
/* This loop should not be horizontally vectorized because the loop
is entered only by the subset of the work items.*/
if (gid > 0) {
for (int i = 0; i < get_local_size(0); ++i) {
printf ("i: %d gid: %d\n", i, gid);
}
}
barrier(CLK_GLOBAL_MEM_FENCE);
}
|
