Not always. Stacks can grow up in some CPUs. http://stackoverflow.com/questions/664744/what-is-the-direction-of-stack-growth-in-most-modern-systems http://stac

Not always. Stacks can grow up in some CPUs. http://stackoverflow.com/questions/664744/what-is-the-direction-of-stack-growth-in-most-modern-systems http://stackoverflow.com/questions/664744/what-is-the-direct... And then there's Itanium, which has two separate stacks, one growing up and one growing down...