Is it's correct to say that ALL types that can grow are place on heap?

[Timoses]

On Tuesday, 11 September 2018 at 12:07:14 UTC, drug wrote:
>
> If data size is less or equal to total size of available 
> registers (that can be used to pass values) than passing by 
> value is more efficient. Passing data with size less than 
> register size by reference isn't efficient because you pass 
> pointer (that has register size) and access memory using it.

Thank you!
So if I pass by reference it will ALWAYS use the address in 
memory to fetch the data, whereas passing it by value enables the 
(compiler?..) to use the register which has already loaded the 
data from memory (stack for example)?