sdcc/device/lib/stm8-large/_mulint.s

   1 ;--------------------------------------------------------------------------
   2 ;  _mulint.s
   3 ;
   4 ;  Copyright (C) 2014-2021, Krzysztof Nikiel, Ben Shi, 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         pushw   x
  35
  36         ld      a, (#7, sp)
  37         mul     x, a
  38         pushw   x
  39
  40         ldw     x, (#2, sp)
  41         mul     x, a
  42         ld      a, xl
  43         add     a, (#1, sp)
  44         ld      (#1, sp), a
  45
  46         ldw     x, (#3, sp)
  47         ld      a, (#8, sp)
  48         mul     x, a
  49         ld      a, xl
  50         add     a, (#1, sp)
  51         popw    x
  52         ld      xh, a
  53
  54         addw    sp, #2
  55         retf
  56