sdcc/device/lib/f8/_mulint.s

   1 ;--------------------------------------------------------------------------
   2 ;  _mulint.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 __mulint
  30
  31 .area CODE
  32
  33 __mulint:
  34         ldw     x, y
  35         xch     yl, yh
  36         ldw     z, y
  37
  38         ld      yl, (2, sp)
  39         ld      xl, yl
  40         ld      zl, (3, sp)
  41
  42         mul     x
  43         mul     z
  44         add     xl, zl
  45
  46         mul     y
  47         add     yh, xl
  48
  49         ret
  50