sdcc/device/lib/stm8/_mullong.s

   1 ;--------------------------------------------------------------------------
   2 ;  _mullong.s
   3 ;
   4 ;  Copyright (C) 2014, Ben Shi
   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 __mullong
  30
  31         .area CODE
  32 __mullong:
  33         clrw    x
  34         pushw   x
  35         pushw   x
  36 __mullong_0:
  37         ld      a, (#10, sp)
  38         ld      xl, a
  39         ld      a, (#14, sp)
  40         mul     x, a
  41         ldw     (#3, sp), x
  42 __mullong_1:
  43         ld      a, (#9, sp)
  44         ld      xl, a
  45         ld      a, (#14, sp)
  46         mul     x, a
  47         addw    x, (#2, sp)
  48         ldw     (#2, sp), x
  49         clr     a
  50         adc     a, #0
  51         ld      (#1, sp), a
  52
  53         ld      a, (#10, sp)
  54         ld      xl, a
  55         ld      a, (#13, sp)
  56         mul     x, a
  57         addw    x, (#2, sp)
  58         ldw     (#2, sp), x
  59         clr     a
  60         adc     a, (#1, sp)
  61         ld      (#1, sp), a
  62 __mullong_2:
  63         ld      a, (#10, sp)
  64         ld      xl, a
  65         ld      a, (#12, sp)
  66         mul     x, a
  67         addw    x, (#1, sp)
  68         ldw     (#1, sp), x
  69
  70         ld      a, (#9, sp)
  71         ld      xl, a
  72         ld      a, (#13, sp)
  73         mul     x, a
  74         addw    x, (#1, sp)
  75         ldw     (#1, sp), x
  76
  77         ld      a, (#8, sp)
  78         ld      xl, a
  79         ld      a, (#14, sp)
  80         mul     x, a
  81         addw    x, (#1, sp)
  82         ldw     (#1, sp), x
  83 __mullong_3:
  84         ld      a, (#7, sp)
  85         ld      xl, a
  86         ld      a, (#14, sp)
  87         mul     x, a
  88         ld      a, xl
  89         add     a, (#1, sp)
  90         ld      (#1, sp), a
  91
  92         ld      a, (#10, sp)
  93         ld      xl, a
  94         ld      a, (#11, sp)
  95         mul     x, a
  96         ld      a, xl
  97         add     a, (#1, sp)
  98         ld      (#1, sp), a
  99
 100         ld      a, (#9, sp)
 101         ld      xl, a
 102         ld      a, (#12, sp)
 103         mul     x, a
 104         ld      a, xl
 105         add     a, (#1, sp)
 106         ld      (#1, sp), a
 107
 108         ld      a, (#8, sp)
 109         ld      xl, a
 110         ld      a, (#13, sp)
 111         mul     x, a
 112         ld      a, xl
 113         add     a, (#1, sp)
 114         ld      (#1, sp), a
 115 __mullong_4:
 116         popw    y
 117         popw    x
 118         ret