mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Libraries/Sapphire/sail/_sh/divide

   1 ;
   2 ; divide.sh
   3 ;
   4 ; Various routines of a division-related nature (MDW/TMA)
   5 ;
   6 ; © 1994 Straylight
   7 ;
   8
   9 ;----- Overview -------------------------------------------------------------
  10 ;
  11 ; Functions provided:
  12 ;
  13 ;  divide
  14 ;  div_unsigned
  15
  16                 [       :LNOT::DEF:divide__dfn
  17                 GBLL    divide__dfn
  18
  19 ; --- divide ---
  20 ;
  21 ; On entry:     R0 == dividend
  22 ;               R1 == divisor
  23 ;
  24 ; On exit:      R0 == quotient
  25 ;               R1 == remainder
  26 ;
  27 ; Use:          A standard divide routine.  Fairly speedy, hopefully.
  28 ;               The results are always such that
  29 ;
  30 ;                       |quotient| <= |(divisor/dividend)|,
  31 ;
  32 ;                       |remainder| < |divisor|
  33 ;
  34 ;               and
  35 ;
  36 ;                       quotient * divisor + remainder == dividend
  37
  38                 IMPORT  divide
  39
  40 ; --- div_unsigned ---
  41 ;
  42 ; On entry:     R0 == dividend
  43 ;               R1 == divisor
  44 ;
  45 ; On exit:      R0 == quotient
  46 ;               R1 == remainder
  47 ;
  48 ; Use:          As for divide, except that it considers its operands to be
  49 ;               unsigned.
  50
  51                 IMPORT  div_unsigned
  52
  53                 ]
  54
  55 ;----- That's all, folks ----------------------------------------------------
  56
  57                 END