[OpenBIOS] Implementing a second return stack

Segher Boessenkool segher at kernel.crashing.org
Sun Apr 17 05:02:27 CEST 2016

On Sat, Apr 16, 2016 at 10:44:47PM -0400, Programmingkid wrote:
> > No; just implement a version of >R etc. that work in interpret mode.  Like
> > 
> > : >r  state @ IF postpone >r EXIT THEN
> >      ( and here, do the push to the simulated R stack ) ; IMMEDIATE
> > 
> > (And easier/cleaner/nicer if your system has separate compile and interpret
> > behaviours for all words, or a separate compiler wordlist).
> >r is implemented in forth.c in c.

The "new" (here defined, in that colon def above) >R calls the "old"
version of >R (via "postpone >r").  Don't try to cram everything into
the "old" definition, unles you like complexity (and that complexity
can be quite enormous, look up what "state smart" words are).


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