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Make DO .. LOOP binary code more compact

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Only a few bytes saved in forth1.bin, but the DO .. LOOP construct
isn't used much yet. It's still significant savings per LOOP call.
This commit is contained in:
Virgil Dupras 2020-04-14 14:59:01 -04:00
parent b8dd86bd18
commit add3b6629b
1 changed files with 10 additions and 2 deletions
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12
forth/core.fs
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@ -94,12 +94,20 @@
H@
; IMMEDIATE
( Increase loop counter and returns whether we should loop. )
: _
R> ( IP, keep for later )
R> 1 + ( ip i+1 )
DUP >R ( ip i )
I' = ( ip f )
SWAP >R ( f )
;
( One could think that we should have a sub word to avoid all
these COMPILE, but we can't because otherwise it messes with
the RS )
: LOOP
COMPILE R> 1 LITN COMPILE + COMPILE DUP COMPILE >R
COMPILE I' COMPILE = COMPILE (?br)
COMPILE _ COMPILE (?br)
H@ - ,
COMPILE R> COMPILE DROP COMPILE R> COMPILE DROP
; IMMEDIATE