1
0
mirror of https://github.com/hsoft/collapseos.git synced 2024-12-24 14:28:06 +11:00

forth: Forth-ify "+"

This commit is contained in:
Virgil Dupras 2020-03-28 15:33:14 -04:00
parent a2c258afba
commit 9cfddea940
4 changed files with 15 additions and 21 deletions

Binary file not shown.

View File

@ -967,24 +967,10 @@ OVER:
jp next
.fill 31
.fill 112
; ( a b -- c ) A + B
.db "+"
.dw $-OVER
.db 1
PLUS:
.dw nativeWord
pop hl
pop de
call chkPS
add hl, de
push hl
jp next
.fill 65
.db "_bend"
.dw $-PLUS
.dw $-OVER
.db 5
; Offset: 06ee
.out $

View File

@ -65,7 +65,7 @@
( exit if null )
DUP NOT IF DROP DROP EXIT THEN
_c EMIT ( a )
1 + ( a+1 )
1 _c + ( a+1 )
AGAIN
;
@ -75,13 +75,13 @@
: C,
HERE @ _c C!
HERE @ 1 + HERE !
HERE @ 1 _c + HERE !
;
( The NOT is to normalize the negative/positive numbers to 1
or 0. Hadn't we wanted to normalize, we'd have written:
32 CMP 1 - )
: WS? 33 _c CMP 1 + NOT ;
: WS? 33 _c CMP 1 _c + NOT ;
: TOWORD
BEGIN
@ -99,7 +99,7 @@
( We take advantage of the fact that char MSB is
always zero to pre-write our null-termination )
OVER ! ( a )
1 + ( a+1 )
1 _c + ( a+1 )
C< ( a c )
DUP _c WS?
UNTIL
@ -111,7 +111,7 @@
: LITN
( JTBL+24 == NUMBER )
JTBL 24 + ,
JTBL 24 _c + ,
,
;

View File

@ -111,6 +111,14 @@ CODE XOR
HL PUSHqq,
;CODE
CODE +
HL POPqq,
DE POPqq,
chkPS,
DE ADDHLss,
HL PUSHqq,
;CODE
CODE -
DE POPqq,
HL POPqq,