blob: 97ba31f0261f1552c412238f30b208cb9cef582a (
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
|
/* { dg-do compile } */
/* { dg-options "-O2 -Wsuggest-attribute=pure" } */
extern int extern_const(int a) __attribute__ ((pure));
extern int v;
/* Trivial. */
int
foo1(int a) /* { dg-bogus "normally" "detect pure candidate" } */
{ /* { dg-warning "pure" "detect pure candidate" { target *-*-* } "9" } */
return v;
}
/* Loops known to be normally and extern const calls should be safe. */
int __attribute__ ((noinline))
foo2(int n) /* { dg-bogus "normally" "detect pure candidate" } */
{ /* { dg-warning "pure" "detect pure candidate" { target *-*-* } "16" } */
int ret = 0;
int i;
for (i=0; i<n; i++)
ret+=extern_const (i);
return ret;
}
/* No warning here; we can work it by ourselves. */
static int __attribute__ ((noinline))
foo2b(int n)
{
int ret = 0;
int i;
for (i=0; i<n; i++)
ret+=extern_const (i);
return ret;
}
/* Unbounded loops are not safe. */
static int __attribute__ ((noinline))
foo3(int n) /* { dg-warning "pure\[^\n\]* normally" "detect pure candidate" } */
{
int ret = 0;
int i;
for (i=0; extern_const (i+n); n++)
ret+=extern_const (i);
return ret;
}
int
foo4(int n) /* { dg-warning "pure\[^\n\]* normally" "detect pure candidate" } */
{
return foo3(n) + foo2b(n);
}
int
foo5(int n) /* { dg-bogus "normally" "detect pure candidate" } */
{ /* { dg-warning "pure" "detect pure candidate" { target *-*-* } "54" } */
return foo2(n);
}
|
