arch/m68k/lib/muldi3.c

   1 /* muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
   2                            gcc-2.7.2.3/longlong.h which is: */
   3 /* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #define BITS_PER_UNIT 8
  23
  24 #define umul_ppmm(w1, w0, u, v) \
  25   __asm__ ("mulu%.l %3,%1:%0"                                           \
  26            : "=d" ((USItype)(w0)),                                      \
  27              "=d" ((USItype)(w1))                                       \
  28            : "%0" ((USItype)(u)),                                       \
  29              "dmi" ((USItype)(v)))
  30
  31 #define __umulsidi3(u, v) \
  32   ({DIunion __w;                                                        \
  33     umul_ppmm (__w.s.high, __w.s.low, u, v);                            \
  34     __w.ll; })
  35
  36 typedef          int SItype     __attribute__ ((mode (SI)));
  37 typedef unsigned int USItype    __attribute__ ((mode (SI)));
  38 typedef          int DItype     __attribute__ ((mode (DI)));
  39 typedef int word_type __attribute__ ((mode (__word__)));
  40
  41 struct DIstruct {SItype high, low;};
  42
  43 typedef union
  44 {
  45   struct DIstruct s;
  46   DItype ll;
  47 } DIunion;
  48
  49 DItype
  50 __muldi3 (DItype u, DItype v)
  51 {
  52   DIunion w;
  53   DIunion uu, vv;
  54
  55   uu.ll = u,
  56   vv.ll = v;
  57
  58   w.ll = __umulsidi3 (uu.s.low, vv.s.low);
  59   w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
  60                + (USItype) uu.s.high * (USItype) vv.s.low);
  61
  62   return w.ll;
  63 }