sdcc/device/lib/f8/_divuint.s

   1 ;--------------------------------------------------------------------------
   2 ;  _divuint.s
   3 ;
   4 ;  Copyright (c) 2023, Philipp Klaus Krause
   5 ;
   6 ;  This library is free software; you can redistribute it and/or modify it
   7 ;  under the terms of the GNU General Public License as published by the
   8 ;  Free Software Foundation; either version 2, or (at your option) any
   9 ;  later version.
  10 ;
  11 ;  This library is distributed in the hope that it will be useful,
  12 ;  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14 ;  GNU General Public License for more details.
  15 ;
  16 ;  You should have received a copy of the GNU General Public License
  17 ;  along with this library; see the file COPYING. If not, write to the
  18 ;  Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  19 ;   MA 02110-1301, USA.
  20 ;
  21 ;  As a special exception, if you link this library with other files,
  22 ;  some of which are compiled with SDCC, to produce an executable,
  23 ;  this library does not by itself cause the resulting executable to
  24 ;  be covered by the GNU General Public License. This exception does
  25 ;  not however invalidate any other reasons why the executable file
  26 ;   might be covered by the GNU General Public License.
  27 ;--------------------------------------------------------------------------
  28
  29 .globl __divuint
  30
  31 .area CODE
  32
  33 ; _divuint (int x, int y)
  34 ; Return quotient in y, remainder in z.
  35 __divuint:
  36
  37         clrw    z
  38         ld      xl, #0x10
  39
  40 1$:
  41
  42         sllw    y
  43         rlcw    z
  44
  45         incw    y
  46         subw    z, (2, sp)
  47         jrc     #2$
  48         sbcw    y       ; add -1
  49         addw    z, (2, sp)
  50 2$:
  51
  52         dec     xl
  53         jrnz    #1$
  54
  55         ret
  56