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
45
46
47
48
49
50
51
52
53
54
55
56
57
|
/* for_bug - reproduces a tail replication bug exposed by URNG of AMD SDK when
adding a barrier to the loop
Copyright (c) 2013 Pekka Jääskeläinen / TUT
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
__kernel void
test_kernel (void)
{
int gid_x = get_global_id (0);
int k = 0;
int i;
volatile int foo[15000];
/* This bug reproduces only if the last 'if' in the loop
writes to a memory, thus cannot be converted to a select.
This produces a crash with 'repl' and an infinite loop with 'wiloops'.
It is caused by a loop structure where there are two paths to the
latch block which decrements the iteration variable. The first path
skips the last if, the second executes it. This confuses the
barrier tail replication.
*/
for (i = 16; i > 0; i--) {
barrier(CLK_LOCAL_MEM_FENCE);
printf ("gid_x %u after barrier at iteration %d\n", gid_x, i);
k += gid_x;
if(i < 15)
foo[i] = k*160 * gid_x;
}
/* If it did not crash and the program does not go to an inifinite
loop, assume OK. */
if (gid_x == 0)
printf("OK\n");
}
|
