Language-specific CPUs was Re: uIEC/SD == AWESOME!

[der Mouse]

> Since SP is in I/O space and not register space, it takes extra
> instructions to perform stack-relative addressing (got to get SP into
> X, Y, or Z) for stack-local variables, etc.

Nothing says that the hardware's stack has to be the same as the C
local-variable stack, and indeed on an architecture like that it might
be smarter to use the hardware's stack - the thing SP points to - only
for return addresses, with local variables and arguments kept on a
separate stack, maintained by the function call/return boilerplate.

Of course, that means you have to keep the data stack pointer
somewhere, since you can't keep it in SP for free....

/~\ The ASCII				  Mouse
\ / Ribbon Campaign
 X  Against HTML		mouse at rodents-montreal.org
/ \ Email!	     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B