blob: 69f6683901ac9c9631108e1250c60b9258493ae5 (
plain)
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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
/* { dg-do link } */
/* { dg-options "-fno-allow-store-data-races -O2" } */
/* { dg-final { simulate-thread } } */
#include <stdio.h>
#include <stdlib.h>
#include "simulate-thread.h"
/* Test distilled from PR52558. */
int g_1 = 1;
int g_2 = 0, insns = 0;
int f;
/* Test that g_2 is not written to unless !g_1. */
__attribute__((noinline))
int funky()
{
int l;
for (l = 0; l != 4; l++)
{
if (g_1)
{
/* g_1 is globally true so we should always execute here,
thus never writing to g_2 under any circumstance in this
code path. */
return l;
}
for (g_2 = 0; g_2 >= 26; ++g_2)
;
}
return 999;
}
int simulate_thread_final_verify ()
{
/* If g_2 != insns, someone must have cached `g_2' and stored a
racy value into it. */
if (g_2 != insns)
{
printf("FAIL: g_2 was incorrectly cached\n");
return 1;
}
return 0;
}
void simulate_thread_other_threads ()
{
++insns;
++g_2;
}
int simulate_thread_step_verify ()
{
return 0;
}
__attribute__((noinline))
void simulate_thread_main()
{
f = funky();
}
int main()
{
simulate_thread_main ();
simulate_thread_done ();
return 0;
}
|
