Aliasing with pointers to subobjects

#include <memory>
#include <time.h>
#include <stdio.h>
using namespace std;

struct IntValue {
    int x;
    IntValue(int x) : x(x) {}
};

class MyClass_Ptr {
    unique_ptr<IntValue> a, b, c;
public:
    MyClass_Ptr(int s)
        : a(new IntValue(s))
        , b(new IntValue(0))
        , c(new IntValue(0))
    {}
    void Compute() {
        a->x += b->x + c->x;
        b->x += a->x + c->x;
        c->x += a->x + b->x;
    }
    void Print() {
        printf("%d\n", a->x + b->x + c->x);
    }
};

class MyClass_Memb {
    IntValue a, b, c;
public:
    MyClass_Memb(int s)
        : a(s)
        , b(0)
        , c(0)
    {}
    void Compute() {
        a.x += b.x + c.x;
        b.x += a.x + c.x;
        c.x += a.x + b.x;
    }
    void Print() {
        printf("%d\n", a.x + b.x + c.x);
    }
};

int main() {
{
    unique_ptr<MyClass_Memb> obj(new MyClass_Memb(1));
    int start = clock();
    for (int i = 0; i < 1000000000; i++)
        obj->Compute();
    obj->Print();
    printf("%0.3lf\n", double(clock() - start) / CLOCKS_PER_SEC);
}
{
    unique_ptr<MyClass_Ptr> obj(new MyClass_Ptr(1));
    int start = clock();
    for (int i = 0; i < 1000000000; i++)
        obj->Compute();
    obj->Print();
    printf("%0.3lf\n", double(clock() - start) / CLOCKS_PER_SEC);
}
    return 0;
}