Label Function
Register1 <- Pop 64-bit off stack
Register2 <- Pop 64-bit off stack
Register3 <- Register1 + Register2
push Register3 on stack  // return
Goto -> Pop address off stack

// Function(0, 5) this is what happens when the function is called
Push address on stack
Push 64-bit 0 on stack
Push 64-bit 5 on stack
Goto Function
Pop stack (address)
Pop stack into register 1

// this is just the function being called with various values
Register2 <- Function(0,5)
Register3 <- Function(1,5)
Register4 <- Function(7,5)