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/* { dg-do run }
* { dg-options "-std=gnu23 -O2" }
*/
/* These tests check that incompatible definitions of
tagged types can be assumed not to alias and that
this is exploited during optimization. */
struct foo { int x; };
[[gnu::noinline,gnu::noipa]]
int test_foo1(struct foo* a, void* b)
{
a->x = 1;
struct foo { int x; int y; }* p = b;
p->x = 2;
return a->x;
}
[[gnu::noinline,gnu::noipa]]
int test_foo2(struct foo* a, void* b)
{
a->x = 1;
struct fox { int x; }* p = b;
p->x = 2;
return a->x;
}
/* While these tests check that incompatible enums can still
* alias, although this is not required. */
enum bar { A = 1, B = 3, C = 5, D = 9 };
[[gnu::noinline,gnu::noipa]]
int test_bar1(enum bar* a, void* b)
{
*a = A;
enum bar { A = 1, B = 3, C = 6, D = 9 }* p = b;
*p = B;
return *a;
}
[[gnu::noinline,gnu::noipa]]
int test_bar2(enum bar* a, void* b)
{
*a = A;
enum baX { A = 1, B = 3, C = 5, D = 9 }* p = b;
*p = B;
return *a;
}
int main()
{
struct foo y;
if (1 != test_foo1(&y, &y))
__builtin_abort();
if (1 != test_foo2(&y, &y))
__builtin_abort();
enum bar z;
if (B != test_bar1(&z, &z))
__builtin_abort();
if (B != test_bar2(&z, &z))
__builtin_abort();
return 0;
}
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