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collapseos/blk/431
Virgil Dupras 1094ec9c57 Make DO..LOOP stable
DO and LOOP now only compile words from stable ABI, which make them
suitable for xcomp. This will greatly simplify driver writing and
allow us to mostly avoid the low/high divide in drivers.

LEAVE is still xcomp-incompatible though.

This make us very very tight for "<0x100" limit for literal words.
Hopefully, we won't need more stuff in that area of the binary...
2020-05-12 10:40:59 -04:00

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: VARIABLE CREATE 2 ALLOT ;
: CONSTANT CREATE , DOES> @ ;
( In addition to pushing H@ this compiles 2>R so that loop
variables are sent to PS at runtime )
: DO COMPILE 2>R H@ ; IMMEDIATE
: LOOP COMPILE (loop) H@ - , ; IMMEDIATE
: LEAVE R> R> DROP I 1- >R >R ;