LXR linux/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
   5This file is part of GNU CC.
   6
   7GNU CC is free software; you can redistribute it and/or modify
   8it under the terms of the GNU General Public License as published by
   9the Free Software Foundation; either version 2, or (at your option)
  10any later version.
  11
  12GNU CC is distributed in the hope that it will be useful,
  13but WITHOUT ANY WARRANTY; without even the implied warranty of
  14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15GNU General Public License for more details.
  16
  17You should have received a copy of the GNU General Public License
  18along with GNU CC; see the file COPYING.  If not, write to
  19the Free Software Foundation, 59 Temple Place - Suite 330,
  20Boston, 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
  36typedef          int SItype     __attribute__ ((mode (SI)));
  37typedef unsigned int USItype    __attribute__ ((mode (SI)));
  38typedef          int DItype     __attribute__ ((mode (DI)));
  39typedef int word_type __attribute__ ((mode (__word__)));
  40
  41struct DIstruct {SItype high, low;};
  42
  43typedef union
  44{
  45  struct DIstruct s;
  46  DItype ll;
  47} DIunion;
  48
  49DItype
  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}
  64