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Divide 14 bit integer using a fixed point divisor and result (7Q8 format)

; Input:
;  a1:a0 - 14 bit dividend   (a0 - lower byte)
;  b1:b0 - 15 bit divisor in 7Q8 format (b1 is integer, b0 is
;          fractional)
; Output:
;  c1:c0 - 15 bit quotient in 7Q8 format
; Size: 27 words
; Time: 3+3+3+15*(5+8+6)-2+3=295 instruction cycles
; March 13, 2001 by Nikolai Golovchenko
; March 14, 2001 optimized by Scott Dattalo
;left align the dividend
; (shift accumulator left 1 bit to get the first result bit weight
;  equal to 128)
        rl      a0
        rl      a1      ;carry is cleared here
;initialize registers
        clr     c0      ;clear result - it will be used
        clr     c1      ;to shift zeroes to dividend
        setb c0.1       ;15 iterations
        rl      a0      ;shift out next bit of dividend
        rl      a1      ;to remainder
        mov     W, b0   ;load w with lower divisor byte
        snc             ;if remainder positive - subtract,
        jmp     div_add ;if negative - add
        sub     a0, W
        mov     W, b1
        movsz   W, ++b1
        sub     a1, W
        jmp     div_next
        add     a0, W
        mov     W, b1
        movsz   W, ++b1
        add     a1, W
;here carry has a new result bit
        rl      c0      ;shift in next result bit
        rl      c1
        jmp     div_loop

file: /Techref/scenix/lib/math/div10byfxp7q8.htm, 1KB, , updated: 2001/3/17 22:58, local time: 2024/7/17 10:13, owner: NG--944,

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