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libMath.asm
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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