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prim.mac
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prim.mac
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;PRIM.MAC
;860624 ALEX
;.INCLUDE 8KLISP.DEF
; EXTRN ERR,MNUM,TEMP
; EXTRN T1,T2,HEAPTR,HEAP
;COMPARE STRINGS HL AND DE
CMPSTR:
PUSH HL ;SAVE PTRS
PUSH DE
-:
LD A,(DE)
CP (HL)
INC HL
INC DE
JR NZ,CSRET ;NOT EQUAL
or a ;AND 80H
jr nz,{-};JR Z,{-}
XOR A
CSRET:
POP DE
POP HL
RET ;EQUAL
;SEARCH SYMBOL TABLE, RETURN CARRY IF FOUND:
SEARCH:
; di
; halt
LD BC,HEAP ;START OF SYMBOL CHAIN
SR10:
LD DE,9 ;OFFSET TO SYMBOL'S NAME
EX DE,HL
ADD HL,BC
EX DE,HL ;DE ON NAME
CALL CMPSTR
JR Z,SRFOUND ;FOUND
DEC DE ;DECREMENT TO LINK(HIGH)
LD A,(DE) ;END OF CHAIN?
OR A
RET Z ;YES
LD B,A
DEC DE
LD (TEMP),DE ;KEEP PTR TO LAST LINK
LD A,(DE)
LD C,A
JR SR10 ;CONT SEARCH
SRFOUND:
LD H,B
LD L,C ;GET RETURN VALUE
; di
; halt
BRKRET:
SCF
RET
;RETURN CARRY IF ESC KEY
BRKEY:
in a,(4)
and 8
ret nz
scf
ret
BDOS (11 ) ;CHECK CONSOLE STATUS
OR A ;CHAR PRESENT?
RET Z ;NO-> CARRY CLEAR
BDOS (1)
CP 27 ;ESC-KEY?
JR Z,BRKRET ;YES
OR A ;ELSE CARRY CLEAR
RET
;RETURN NUMBER IN DEC
UNBXDE:
EX DE,HL
UNBOX:
CALL MNUM
LD DE,0 ;DEFAULT ZERO
LD C,0
INC HL ;GET COUNT
LD A,(HL)
OR A ;ZERO?
RET Z ;YES
INC HL
LD C,(HL)
DEC A
RET Z
INC HL
LD E,(HL)
DEC A
RET Z
INC HL
LD D,(HL)
DEC A
RET Z
RANGERR:
ERROR("Range")
;MACRO DEFINITIONS
/*LDC1 MACRO
LD A,(HL) ;GET LENGTH
AND 07FH ;STRIP SIGN
LD C,A
ENDM*/
.define LDC1 ld a,(hl) \ and 07fh \ ld c,a
/*LDB1 MACRO
LD A,(DE)
AND 07FH
LD B,A
ENDM*/
.define LDB1 ld a,(de) \ and 07fh \ ld b,a
;INCREMENT LENGTH INDICATOR
INRM:
INC (HL)
LD A,(HL) ;GET LENGTH
AND 07FH
CP MAXNUM+1 ;TOO BIG?
RET C ;OK
POP HL ;ELSE DROP RET
POP HL
OVRFL:
ERROR("Ovrfl")
;DECREMENT LENGTH INDICATOR
DCRM:
LD A,(HL) ;GET LENGTH
CP 81H ;SPECIAL CASE?
JR Z,DCRM1 ;YES-JMP
DEC (HL)
RET Z ;RETURN WITH CONDITION CODE SET
XOR (HL)
RET
DCRM1:
LD (HL),0 ;GENERATE ZERO
RET
;INSERT BYTE FROM A INTO LOW ORDER OF MULTIBYTE DATA
PSHL:
PUSH AF ;SAVE BYTE
LD B,0
LD A,(HL) ;GET LENGTH
OR A
LD C,A
JR Z,PSHL2
ADD HL,BC
PSHL1:
LD A,(HL) ;SHUFFLE UP DATA
INC HL
LD (HL),A
DEC HL
DEC HL
DEC C
JR NZ,PSHL1
PSHL2:
INC (HL) ;INCREMENT LENGTH
JR Z,OVRFL ;OVERFLOW ERROR
POP AF ;RETRIEVE BYTE
INC HL
LD (HL),A ;INSERT IT
DEC HL
RET
;INCREMENT THE MODULUS OF MULTIBYTE DATA
INCR:
PUSH HL
LDC1
JR Z,INCR2
INCR1:
INC HL
INC (HL) ;INCREMENT DATA
JR NZ,INCR3 ;OVERFLOW
DEC C
JR NZ,INCR1
INCR2:
INC HL
LD (HL),1
POP HL
JR INRM
INCR3:
POP HL
RET
;SHIFT DATA LEFT ONE BIT
LEFT:
LDC1
RET Z
PUSH HL
LEFT1:
INC HL
LD A,(HL)
RLA
LD (HL),A
DEC C
JR NZ,LEFT1
JR C,INCR2 ;OVERFLOW
POP HL
RET
;SHIFT DATA RIGHT ONE BIT
RIGHT:
LDC1
RET Z
LD B,0
ADD HL,BC
LD A,(HL)
RRA
LD (HL),A
LD B,A
RIGHT1:
DEC HL
DEC C
JR Z,RIGHT2
LD A,(HL)
RRA
LD (HL),A
JR RIGHT1
RIGHT2:
DEC B
RET P
PUSH AF ;SAVE CARRY = LOST BIT
CALL DCRM ;DECREMENT LENGTH
POP AF
RET
;SET OPERANDS
SETOPS:
LD HL,(HEAPTR)
INC HL
INC DE
;MOVE DATA FROM DE TO HL
MOOV:
LDB1
LD (HL),A ;MOVE ANY ZERO LENGTH
RET Z
LD A,(DE) ;ELSE MOVE PROPER LENGTH
LD (HL),A
PUSH DE
PUSH HL
MOOV1:
INC DE
INC HL
LD A,(DE)
LD (HL),A
DJNZ MOOV1
POP HL
POP DE
RET
;EQUALITY TEST PRIMITIVE
EQUAL?:
LD A,H
OR A ;NIL?
JR Z,EQATOM ;YES
LD A,(HL)
RRCA ;ATOM?
JR NC,EQATOM ;YES
LD A,(DE) ;SECOND ARG
AND 1 ;ATOM?
DEC A
RET NZ ;YES
PUSH DE ;BOTH ARGS ARE LISTS
POPLIST
EX (SP),HL ;SAVE CDR OF ARG 1
PUSH DE
POPLIST
EX (SP),HL ;SAVE CDR OF ARG 2
CALL EQUAL? ;TEST CARS FOR EQUAL
POP DE
POP HL
JR Z,EQUAL? ;TEST CDRS FOR EQUAL
RET
EQATOM:
CPDE ;POINTER EQUALITY?
RET Z ;YES
LD A,(HL) ;ELSE NUMBERS?
AND 81H
CP 80H
RET NZ ;NO
LD A,(DE)
AND 81H
CP 80H
RET NZ ;NO
EQNUM:
INC HL ;COMPARE NUMBERS
INC DE
;COMPARE DE TO HL
SPARE:
LD A,(DE)
AND (HL) ;BOTH SIGNS NEGATIVE?
JP M,PARE3 ;YES
PARE:
LD A,(HL)
XOR 80H ;SET SIGN (HL) TRUE
LD B,A
LD A,(DE)
XOR 80H ;SET SIGN (DE) TRUE
CP B
RET NZ ;NOT EQUAL LENGTH
LDC1
PUSH HL
PUSH DE
LD B,0
ADD HL,BC ;MSB HL
EX DE,HL
ADD HL,BC
EX DE,HL
PARE1:
LD A,(DE)
CP (HL) ;COMPARE BYTES
JR NZ,PARE2
DEC HL ;EQUAL: TRY NEXT LOWER BYTES
DEC DE
DEC C
JR NZ,PARE1
PARE2:
POP DE
POP HL
RET
PARE3:
CALL PARE
CCF ;CORRECT RESULT IF BOTH NUMBERS NEGATIVE
RET
;ADD DATA DE TO HL
ADD1:
LDC1
RET Z
PUSH DE
PUSH HL
LDB1
SUB C ;COMPARE LENGTHS
EX DE,HL
JR NC,ADD11
CPL
ADC A,(HL) ;INCREASE AUGENDS
LD (HL),A
XOR A
ADD A,B
JR Z,ADD14 ;AUGEND = ZERO
ADD11:
INC HL
INC DE
LD A,(DE)
ADC A,(HL)
LD (HL),A
DEC B
JR Z,ADD15
DEC C
JR NZ,ADD11
ADD12:
INC HL
LD A,(HL)
ADC A,C
LD (HL),A
DEC B
JR NZ,ADD12
JR NC,ADD16
ADD13:
INC HL ;OVERFLOW
LD (HL),1 ;EXTEND DATA
POP DE
POP HL
CALL INRM
EX DE,HL
RET
ADD14:
INC HL
INC DE
LD A,(DE)
ADC A,B
LD (HL),A
ADD15:
DEC C
JR NZ,ADD14
JR C,ADD13
ADD16:
POP HL
POP DE
RET
;SUBTRACT DATA HL FROM DE
SUB1:
LDC1
RET Z
PUSH HL
PUSH DE
LDB1
SUB C
JR NC,SUB11
EX DE,HL
CPL
ADC A,(HL) ;INCREASE MINUENDS LENGTH (PRESERVE SIGN)
LD (HL),A
XOR A
ADD A,B
EX DE,HL
JR Z,SUB12 ;MINUEND = 0
SUB11:
INC HL
INC DE
LD A,(DE)
SBC A,(HL)
LD (DE),A
DEC C
JR Z,SUB16 ;SUBTRAHEND EXHAUSTED
DEC B
JR NZ,SUB11 ;MINUEND EXHAUSTED
SUB12:
INC HL
INC DE
LD A,B
SBC A,(HL)
LD (DE),A
DEC C
JR NZ,SUB12
SUB13:
POP HL ;2'COMP THE -VE RESULT
PUSH HL
PUSH DE
LD A,(HL)
XOR 80H ;CHANGE SIGN
LD (HL),A
AND 7FH
LD C,A ;LENGTH
SCF
SUB14:
INC HL
LD A,(HL)
CPL
ADC A,B
LD (HL),A
DEC C
JR NZ,SUB14
POP DE
JR SUB17
SUB15:
INC DE
LD A,(DE)
SBC A,C
LD (DE),A
SUB16:
DEC B
JR NZ,SUB15
JR C,SUB13
SUB17:
POP HL
SUB18:
LD A,(DE)
CP C
JR NZ,SUB1A
DEC DE
SUB19:
CALL DCRM
JR NZ,SUB18
SUB1A:
EX DE,HL
POP HL
RET
;MULTIPLY: DE = DE * HL
MULT0:
LD A,(DE)
AND 07FH
LD B,A
RET Z
PUSH HL
LD A,(DE)
XOR (HL)
PUSH AF ;SAVE SIGNS
PUSH DE
PUSH HL
LD HL,T1
CALL MOOV ;MOVE MULTIPLICAND
XOR A
LD (DE),A ;CLEAR RESULT
POP DE
LD HL,T2
CALL MOOV ;MOVE MULTIPLIER
POP DE
MULT1:
LD HL,T2 ;MULTIPLICATION STARTS
LD A,(HL)
OR A
JR Z,MULT3 ;DONE
CALL RIGHT
LD HL,T1
JR NC,MULT2 ;LEAST SIGNIFICANT BIT NOT SET
CALL ADD1
MULT2:
CALL LEFT
JR MULT1
MULT3:
POP AF
POP HL
RET P
LD A,(DE)
XOR 80H ;CHANGE SIGN
LD (DE),A
RET
DIV00:
POP AF ;GET FLAGS
RLCA ;MOD?
JR C,DVR10 ;YES
XOR A
LD (DE),A ;ELSE RETURN ZERO
DVR10:
POP HL
RET
DIVZER:
POP AF
POP HL
ERROR("Div/0")
;DIVIDE, DIVIDE&ROUND AND MODULO: DE = DE / HL
MOD0:
XOR A
ADD A,80H ;CLEAR CARRY, SET SIGN
JR DIV1
DIVR:
XOR A
SCF ;SET CARRY
JR DIV1
DIV0:
XOR A ;CLEAR CARRY
DIV1:
PUSH HL
PUSH AF
LD A,(DE)
XOR (HL)
RLCA
JR NC,DIV2
POP AF
INC A ;PUT ANY DIFFERENCE IN SIGNS INTO BIT 0
PUSH AF
DIV2:
LDC1
JR Z,DIVZER ;DIVISOR ZERO
LDB1
SUB C
JP M,DIV00 ;DIVISOR > DIVIDEND
PUSH DE
INC A
LD B,A
LD C,A
PUSH BC ;SAVE LENGTH DIFFERENCE
LD A,(DE)
AND 7FH ;CLEAR SIGN DIVIDEND
LD (DE),A
EX DE,HL
LD HL,T1
LD A,(HL)
AND 7FH ;CLEAR SIGN OF PARTIAL DIVISOR
LD (HL),A
CALL MOOV ;MOVE DIVISOR
XOR A
LD (T2),A
POP DE
DIV3:
CALL PSHL
DEC E
JR NZ,DIV3
LD C,A
LD B,D
DIV4:
POP DE ;DIVISION STARTS
PUSH DE
PUSH BC
LD HL,T1
CALL PARE ;PARTIAL DIVIDEND >= PARTIAL DIVISOR?
JR C,DIV5 ;NO
CALL SUB1 ;ELSE SUBTRACT
LD HL,T2
CALL INCR
DIV5:
LD HL,T1 ;RIGHT SHIFT PARTIAL DIVISOR
CALL RIGHT
POP BC
DEC C ;REDUCE COUNT
JP P,DIV6
LD C,7
DEC B
JP M,DIV7 ;END
DIV6:
PUSH BC
LD HL,T2
CALL LEFT ;LEFT SHIFT PARTIAL RESULT
POP BC
JR DIV4
DIV7:
POP DE ;REM
POP AF
JP M,DIVB ;MODULO
JR NC,DIV9 ;NOT ROUND
PUSH AF
CALL PARE ;PARTIAL DIVISOR/2 < REM?
JR C,DIV8
JR Z,DIV8
LD HL,T2 ;YES
CALL INCR ;INCREMENT RESULT
DIV8:
POP AF
DIV9:
EX DE,HL
LD DE,T2
AND 1
JR Z,DIVA ;NO CHANGE OF SIGN
LD A,(DE)
OR 80H
LD (DE),A
DIVA:
CALL MOOV ;MOVE RESULT TO (DE)
EX DE,HL
DIVB:
XOR A
POP HL
RET
;SQUARE ROOT DE
SQRTR:
OR A ;CLEAR CARRY FOR ROUND
JR SQRT1
SQRT0:
SCF ;SET CARRY FOR NOT ROUND
SQRT1:
PUSH AF ;SAVE OPERATION TYPE
LD A,(DE)
OR A
SCF
JP P,SQRT2
POP BC
RET ;RETURN UNDONE -VE OR ZERO
SQRT2:
LD C,1
LD HL,T2
LD (HL),C
INC HL
LD (HL),C ;INIT T2 TO 1
PUSH DE
LD D,A
XOR A
DEC HL
SQRT3:
CALL PSHL
DEC D ;MAKE T2 > N (T2 MUST BE SQUARE NUMBER)
JR NZ,SQRT3
LD DE,T1
LD (DE),A ;CLEAR T1
SQRT4:
CALL ADD1 ;T1 = T1+T2
EX DE,HL
POP DE
CALL PARE ;N >= T1?
PUSH AF
CALL NC,SUB1 ;YES: N = N-T1
POP AF
PUSH DE
EX DE,HL
LD HL,T2
PUSH AF
CALL NC,ADD1 ;YES: T1 = T1+T2
POP AF
CALL C,SUB1 ;NO: T1 = T1-T2
EX DE,HL
CALL RIGHT ;T1 = T1/2
EX DE,HL
CALL RIGHT
CALL RIGHT ;T2 = T2/4
LD A,(HL)
OR A ;T2 = 0?
JR NZ,SQRT4 ;NO
POP HL
POP AF ;WAS IT ROUND?
JR C,SQRT5 ;NO
CALL PARE ;N>T1?
JR NC,SQRT5
EX DE,HL
CALL INCR ;YES: T1 = T1+1
EX DE,HL
SQRT5:
CALL MOOV ;PUT RESULT
EX DE,HL
OR A ;CLEAR CARRY FOR GOOD RESULT
RET
END