Re: [openrisc] Re: PC as GPR?

["Marko Mlinar" <markom@opencores.org>]

> Look how Altera NIOS does the windowed register files. Interrupts are
> quite clean as far as I can see. You have a problem only if you programmed
> poorly i.e. did not leave sufficient space in register file for possible
> interrupt.
>
> Before implimenting a register file you have to look at the requirements
for
> the need of a register file. The overriding needs are to conserve bits in
> the
> instruction (keep narrow) and probably more important an efficient means
> for passing arguments on a function call.
I know windowed register file can be implemented correctly. Peronally I
admire
IA64 solution, but my point was that you can easily do something wrong too.

Marko


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