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/* { 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(unsigned int n) /* { dg-warning "pure\[^\n\]* normally" "detect pure candidate" } */
{
int ret = 0;
unsigned 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);
}
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