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libMath.asm
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;===============================================================================
; Macros/Subroutines
defm LIBMATH_ABS_AA ; /1 = Number (Address)
; /2 = Result (Address)
lda /1
bpl @positive
eor #$FF ; invert the bits
sta /2
inc /2 ; add 1 to give the two's compliment
jmp @done
@positive
sta /2
@done
endm
;==============================================================================
defm LIBMATH_ADD8BIT_AAA
; /1 = 1st Number (Address)
; /2 = 2nd Number (Address)
; /3 = Sum (Address)
clc ; Clear carry before add
lda /1 ; Get first number
adc /2 ; Add to second number
sta /3 ; Store in sum
endm
;==============================================================================
defm LIBMATH_ADD8BIT_AVA
; /1 = 1st Number (Address)
; /2 = 2nd Number (Value)
; /3 = Sum (Address)
clc ; Clear carry before add
lda /1 ; Get first number
adc #/2 ; Add to second number
sta /3 ; Store in sum
endm
;==============================================================================
defm LIBMATH_ADD16BIT_AAVAAA
; /1 = 1st Number High Byte (Address)
; /2 = 1st Number Low Byte (Address)
; /3 = 2nd Number High Byte (Value)
; /4 = 2nd Number Low Byte (Address)
; /5 = Sum High Byte (Address)
; /6 = Sum Low Byte (Address)
clc ; Clear carry before first add
lda /2 ; Get LSB of first number
adc /4 ; Add LSB of second number
sta /6 ; Store in LSB of sum
lda /1 ; Get MSB of first number
adc #/3 ; Add carry and MSB of NUM2
sta /5 ; Store sum in MSB of sum
endm
;==============================================================================
defm LIBMATH_ADD16BIT_AAVVAA
; /1 = 1st Number High Byte (Address)
; /2 = 1st Number Low Byte (Address)
; /3 = 2nd Number High Byte (Value)
; /4 = 2nd Number Low Byte (Value)
; /5 = Sum High Byte (Address)
; /6 = Sum Low Byte (Address)
clc ; Clear carry before first add
lda /2 ; Get LSB of first number
adc #/4 ; Add LSB of second number
sta /6 ; Store in LSB of sum
lda /1 ; Get MSB of first number
adc #/3 ; Add carry and MSB of NUM2
sta /5 ; Store sum in MSB of sum
endm
;==============================================================================
defm LIBMATH_MIN8BIT_AV ; /1 = Number 1 (Address)
; /2 = Number 2 (Value)
lda #/2 ; load Number 2
cmp /1 ; compare with Number 1
bcs @skip ; if Number 2 >= Number 1 then skip
sta /1 ; else replace Number1 with Number2
@skip
endm
;==============================================================================
defm LIBMATH_MAX8BIT_AV ; /1 = Number 1 (Address)
; /2 = Number 2 (Value)
lda #/2 ; load Number 2
cmp /1 ; compare with Number 1
bcc @skip ; if Number 2 < Number 1 then skip
sta /1 ; else replace Number1 with Number2
@skip
endm
;==============================================================================
defm LIBMATH_MIN16BIT_AAVV ; /1 = Number 1 High (Address)
; /2 = Number 1 Low (Address)
; /3 = Number 2 High (Value)
; /4 = Number 2 Low (Value)
; high byte
lda /1 ; load Number 1
cmp #/3 ; compare with Number 2
bmi @skip ; if Number 1 < Number 2 then skip
lda #/3
sta /1 ; else replace Number1 with Number2
; low byte
lda #/4 ; load Number 2
cmp /2 ; compare with Number 1
bcs @skip ; if Number 2 >= Number 1 then skip
sta /2 ; else replace Number1 with Number2
@skip
endm
;==============================================================================
defm LIBMATH_MAX16BIT_AAVV ; /1 = Number 1 High (Address)
; /2 = Number 1 Low (Address)
; /3 = Number 2 High (Value)
; /4 = Number 2 Low (Value)
; high byte
lda #/3 ; load Number 2
cmp /1 ; compare with Number 1
bcc @skip ; if Number 2 < Number 1 then skip
sta /1 ; else replace Number1 with Number2
; low byte
lda #/4 ; load Number 2
cmp /2 ; compare with Number 1
bcc @skip ; if Number 2 < Number 1 then skip
sta /2 ; else replace Number1 with Number2
@skip
endm
;==============================================================================
defm LIBMATH_SUB8BIT_AAA
; /1 = 1st Number (Address)
; /2 = 2nd Number (Address)
; /3 = Sum (Address)
sec ; sec is the same as clear borrow
lda /1 ; Get first number
sbc /2 ; Subtract second number
sta /3 ; Store in sum
endm
;==============================================================================
defm LIBMATH_SUB8BIT_AVA
; /1 = 1st Number (Address)
; /2 = 2nd Number (Value)
; /3 = Sum (Address)
sec ; sec is the same as clear borrow
lda /1 ; Get first number
sbc #/2 ; Subtract second number
sta /3 ; Store in sum
endm
;==============================================================================
defm LIBMATH_SUB16BIT_AAVAAA
; /1 = 1st Number High Byte (Address)
; /2 = 1st Number Low Byte (Address)
; /3 = 2nd Number High Byte (Value)
; /4 = 2nd Number Low Byte (Address)
; /5 = Sum High Byte (Address)
; /6 = Sum Low Byte (Address)
sec ; sec is the same as clear borrow
lda /2 ; Get LSB of first number
sbc /4 ; Subtract LSB of second number
sta /6 ; Store in LSB of sum
lda /1 ; Get MSB of first number
sbc #/3 ; Subtract borrow and MSB of NUM2
sta /5 ; Store sum in MSB of sum
endm
;==============================================================================
defm LIBMATH_SUB16BIT_AAVVAA
; /1 = 1st Number High Byte (Address)
; /2 = 1st Number Low Byte (Address)
; /3 = 2nd Number High Byte (Value)
; /4 = 2nd Number Low Byte (Value)
; /5 = Sum High Byte (Address)
; /6 = Sum Low Byte (Address)
sec ; sec is the same as clear borrow
lda /2 ; Get LSB of first number
sbc #/4 ; Subtract LSB of second number
sta /6 ; Store in LSB of sum
lda /1 ; Get MSB of first number
sbc #/3 ; Subtract borrow and MSB of NUM2
sta /5 ; Store sum in MSB of sum
endm
;==============================================================================
defm LIBMATH_ADD16BIT_AAA
; /1 = 1st Number Word (Address)
; /2 = 2nd Number Word (Address)
; /3 = 3rd Number Word (Address)
clc ; Clear carry before first add
lda /1 ; Get LSB of first number
adc /2 ; Add LSB of second number
sta /3 ; Store in LSB of sum
lda /1+1 ; Get MSB of first number
adc /2+1 ; Add carry and MSB of NUM2
sta /3+1 ; Store sum in MSB of sum
endm
;==============================================================================
defm LIBMATH_SUB16BIT_AAA
; /1 = 1st Number Word (Address)
; /2 = 2nd Number Word (Address)
; /3 = 3rd Number Word (Address)
sec ; sec is the same as clear borrow
lda /1 ; Get LSB of first number
sbc /2 ; Subtract LSB of second number
sta /3 ; Store in LSB of sum
lda /1+1 ; Get MSB of first number
sbc /2+1 ; Subtract borrow and MSB of NUM2
sta /3+1 ; Store sum in MSB of sum
endm
;==============================================================================
defm LIBMATH_ADD24BIT_AAA
; /1 = 1st Number 3 Bytes (Address)
; /2 = 2nd Number 3 Bytes (Address)
; /3 = 3rd Number 3 Bytes (Address)
clc ; Clear carry before first add
lda /1 ; Get LSB of first number
adc /2 ; Add LSB of second number
sta /3 ; Store in LSB of sum
lda /1+1 ; Get MSB of first number
adc /2+1 ; Add carry and MSB of NUM2
sta /3+1 ; Store sum in MSB of sum
lda /1+2 ; Get MSB of first number
adc /2+2 ; Add carry and MSB of NUM2
sta /3+2 ; Store sum in MSB of sum
endm
;==============================================================================
defm LIBMATH_SUB24BIT_AAA
; /1 = 1st Number 3 Bytes (Address)
; /2 = 2nd Number 3 Bytes (Address)
; /3 = 3rd Number 3 Bytes (Address)
sec ; sec is the same as clear borrow
lda /1 ; Get LSB of first number
sbc /2 ; Subtract LSB of second number
sta /3 ; Store in LSB of sum
lda /1+1 ; Get MSB of first number
sbc /2+1 ; Subtract borrow and MSB of NUM2
sta /3+1 ; Store sum in MSB of sum
lda /1+2 ; Get MSB of first number
sbc /2+2 ; Subtract borrow and MSB of NUM2
sta /3+2 ; Store sum in MSB of sum
endm
;==============================================================================
defm LIBMATH_ADD24BIT2sCOMP_AAA
; /1 = 1st Number 3 Bytes (Address)
; /2 = 2nd Number 3 Bytes (Address)
; /3 = 3rd Number 3 Bytes (Address)
lda /2+1
bmi @Subtract
;lda #$30
;sta 1029
clc ; Clear carry before first add
lda /1 ; Get LSB of first number
adc /2 ; Add LSB of second number
sta /3 ; Store in LSB of sum
lda /1+1 ; Get MSB of first number
adc /2+1 ; Add carry and MSB of NUM2
sta /3+1 ; Store sum in MSB of sum
lda /1+2 ; Get MSB of first number
adc /2+2 ; Add carry and MSB of NUM2
sta /3+2 ; Store sum in MSB of sum
jmp @end
@Subtract
;lda #$31
;sta 1029
clc ; Clear carry before first add
lda /2+2
eor #$FF
adc #1
sta $02FF
;sta 1030
clc
lda /2+1
eor #$FF
;adc #1
sta $02FE
;sta 1031
clc
lda /2
eor #$FF
adc #1
sta $02FD
;sta 1032
sec
lda /1
sbc $02FD
sta /3
lda /1+1
sbc $02FE
sta /3+1
lda /1+2
sbc $02FF
sta /3+2
@end
endm