collapseos/blk/371
2020-05-22 14:19:02 -04:00

14 lines
356 B
Plaintext

: MOVE ( a1 a2 u -- )
( u ) 0 DO ( a1 a2 )
SWAP C@+ ( a2 a1+1 x )
ROT C!+ ( a1+1 a2+1 )
LOOP 2DROP ;
: MOVE- ( a1 a2 u -- )
TUCK + 1- ( a1 u a2+u-1 )
ROT 2 PICK + 1- ( u a2+u-1 a1+u-1 )
ROT ( u ) 0 DO ( a2 a1 )
C@- ( a2 a1-1 x )
ROT C!- ( a1-1 a2-1 ) SWAP ( a2 a1 )
LOOP 2DROP ;
: PREV 3 - DUP @ - ;