/* { dg-do run } */
|
/* { dg-do run } */
|
/* { dg-options "-O2" } */
|
/* { dg-options "-O2" } */
|
|
|
/* Test provided by Brian Ryner in PR 14511. The alias analyzer was
|
/* Test provided by Brian Ryner in PR 14511. The alias analyzer was
|
not handling structures containing arrays properly. In this case,
|
not handling structures containing arrays properly. In this case,
|
the static cast was introducing two assignments of the form
|
the static cast was introducing two assignments of the form
|
|
|
this_6->_vptr.IFoo = &_ZTV4IFoo[2];
|
this_6->_vptr.IFoo = &_ZTV4IFoo[2];
|
this_4->_vptr.IFoo = &_ZTV3Bar[2];
|
this_4->_vptr.IFoo = &_ZTV3Bar[2];
|
|
|
which were not considered to alias each other because the alias
|
which were not considered to alias each other because the alias
|
analyzer was not computing a proper pointer to array elements.
|
analyzer was not computing a proper pointer to array elements.
|
Another related bug was the type based alias analyzer not computing
|
Another related bug was the type based alias analyzer not computing
|
alias relations to _ZTV4IFoo and _ZTV3Bar. Since those variables
|
alias relations to _ZTV4IFoo and _ZTV3Bar. Since those variables
|
are read-only, it was disregarding alias information for them.
|
are read-only, it was disregarding alias information for them.
|
So, the memory tags for the two 'this' variables were not being
|
So, the memory tags for the two 'this' variables were not being
|
marked as aliased with these variables. Resulting in the two
|
marked as aliased with these variables. Resulting in the two
|
assignments not aliasing each other.
|
assignments not aliasing each other.
|
|
|
This was causing the optimizers to generate a call to the virtual
|
This was causing the optimizers to generate a call to the virtual
|
method Foo() instead of the overloaded version. */
|
method Foo() instead of the overloaded version. */
|
|
|
struct IFoo
|
struct IFoo
|
{
|
{
|
virtual void Foo() = 0;
|
virtual void Foo() = 0;
|
};
|
};
|
|
|
struct Bar : IFoo
|
struct Bar : IFoo
|
{
|
{
|
void Foo() { }
|
void Foo() { }
|
};
|
};
|
|
|
int main(int argc, char **argv)
|
int main(int argc, char **argv)
|
{
|
{
|
Bar* b = new Bar();
|
Bar* b = new Bar();
|
static_cast(b)->Foo();
|
static_cast(b)->Foo();
|
return 0;
|
return 0;
|
}
|
}
|
|
|
