2018-03-12 18:15:39 +00:00
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mcopy dag.macros
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****************************************************************
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*
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* function udiv(x,y: longint): longint;
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*
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* Inputs:
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* num1 - numerator
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* num2 - denominator
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*
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* Outputs:
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* ans - result
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*
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****************************************************************
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*
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udiv start
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ans equ 0 answer
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rem equ 4 remainder
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subroutine (4:num1,4:num2),8
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;
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; Initialize
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;
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stz rem rem = 0
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stz rem+2
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move4 num1,ans ans = num1
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lda num2 check for division by zero
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ora num2+2
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beq dv9
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lda num2+2 do 16 bit divides separately
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ora ans+2
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beq dv5
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;
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; 32 bit divide
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;
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ldy #32 32 bits to go
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dv3 asl ans roll up the next number
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rol ans+2
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rol ans+4
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rol ans+6
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sec subtract for this digit
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lda ans+4
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sbc num1
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tax
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lda ans+6
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sbc num2+2
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bcc dv4 branch if minus
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stx ans+4 turn the bit on
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sta ans+6
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inc ans
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dv4 dey next bit
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bne dv3
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bra dv9 go do the sign
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;
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; 16 bit divide
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;
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dv5 lda #0 initialize the remainder
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ldy #16 16 bits to go
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dv6 asl ans roll up the next number
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rol a
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sec subtract the digit
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sbc num2
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bcs dv7
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adc num2 digit is 0
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dey
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bne dv6
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bra dv8
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dv7 inc ans digit is 1
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dey
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bne dv6
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dv8 sta ans+4 save the remainder
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;
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; Return the result
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;
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dv9 return 4:ans move answer
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end
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****************************************************************
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*
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* function umod(x,y: longint): longint;
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*
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* Inputs:
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* num1 - numerator
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* num2 - denominator
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*
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* Outputs:
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* ans+4 - result
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*
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****************************************************************
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*
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umod start
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ans equ 0 answer
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rem equ 4 remainder
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subroutine (4:num1,4:num2),8
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;
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; Initialize
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;
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stz rem rem = 0
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stz rem+2
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move4 num1,ans ans = num1
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lda num2 check for division by zero
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ora num2+2
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beq dv9
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lda num2+2 do 16 bit divides separately
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ora ans+2
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beq dv5
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;
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; 32 bit divide
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;
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ldy #32 32 bits to go
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dv3 asl ans roll up the next number
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rol ans+2
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rol ans+4
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rol ans+6
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sec subtract for this digit
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lda ans+4
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sbc num1
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tax
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lda ans+6
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sbc num2+2
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bcc dv4 branch if minus
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stx ans+4 turn the bit on
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sta ans+6
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inc ans
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dv4 dey next bit
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bne dv3
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bra dv9 go do the sign
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;
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; 16 bit divide
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;
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dv5 lda #0 initialize the remainder
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ldy #16 16 bits to go
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dv6 asl ans roll up the next number
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rol a
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sec subtract the digit
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sbc num2
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bcs dv7
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adc num2 digit is 0
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dey
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bne dv6
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bra dv8
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dv7 inc ans digit is 1
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dey
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bne dv6
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dv8 sta ans+4 save the remainder
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;
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; Return the result
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;
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dv9 return 4:ans+4 move answer
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end
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****************************************************************
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*
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* function umul(x,y: longint): longint;
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*
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* Inputs:
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* num2,num1 - operands
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*
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* Outputs:
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* ans - result
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*
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****************************************************************
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*
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umul start
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ans equ 0 answer
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subroutine (4:num1,4:num2),8
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;
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; Initialize the sign and split on precision.
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;
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stz ans+4 set up the multiplier
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stz ans+6
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lda num1
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sta ans
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lda num1+2
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sta ans+2
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beq ml3 branch if the multiplier is 16 bit
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;
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; Do a 32 bit by 32 bit multiply.
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;
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ldy #32 32 bit multiply
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jsr ml1
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brl ml7
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ml1 lda ans SYSS1*SYSS1+2+SYSS1+2 -> SYSS1,SYSS1+2
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lsr a
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bcc ml2
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clc add multiplicand to the partial product
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lda ans+4
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adc num2
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sta ans+4
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lda ans+6
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adc num2+2
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sta ans+6
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ml2 ror ans+6 shift the interem result
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ror ans+4
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ror ans+2
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ror ans
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dey loop til done
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bne ml1
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rts
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; Do and 16 bit by 32 bit multiply.
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;
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ml3 lda num2+2 branch if 16x16 is possible
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beq ml4
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ldy #16 set up for 16 bits
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jsr ml1 do the multiply
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lda ans+2 move the answer
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sta ans
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lda ans+4
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sta ans+2
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bra ml7
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;
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; Do a 16 bit by 16 bit multiply.
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;
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ml4 ldy #16 set the 16 bit counter
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ldx ans move the low word
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stx ans+2
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ml5 lsr ans+2 test the bit
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bcc ml6 branch if the bit is off
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clc
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adc num2
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ml6 ror a shift the answer
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ror ans
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dey loop
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bne ml5
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sta ans+2 save the high word
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;
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; Return the result.
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;
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ml7 return 4:ans fix the stack
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end
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