arch/v850/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, 2001 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 umul_ppmm(w1, w0, u, v) \
  23   __asm__ ("mulu %3, %0, %1"                                            \
  24            : "=r" ((USItype)(w0)),                                      \
  25              "=r" ((USItype)(w1))                                       \
  26            : "%0" ((USItype)(u)),                                       \
  27              "r" ((USItype)(v)))
  28
  29 #define __umulsidi3(u, v) \
  30   ({DIunion __w;                                                        \
  31     umul_ppmm (__w.s.high, __w.s.low, u, v);                            \
  32     __w.ll; })
  33
  34 typedef          int SItype     __attribute__ ((mode (SI)));
  35 typedef unsigned int USItype    __attribute__ ((mode (SI)));
  36 typedef          int DItype     __attribute__ ((mode (DI)));
  37 typedef int word_type __attribute__ ((mode (__word__)));
  38
  39 struct DIstruct {SItype high, low;};
  40
  41 typedef union
  42 {
  43   struct DIstruct s;
  44   DItype ll;
  45 } DIunion;
  46
  47 DItype
  48 __muldi3 (DItype u, DItype v)
  49 {
  50   DIunion w;
  51   DIunion uu, vv;
  52
  53   uu.ll = u,
  54   vv.ll = v;
  55
  56   w.ll = __umulsidi3 (uu.s.low, vv.s.low);
  57   w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
  58                + (USItype) uu.s.high * (USItype) vv.s.low);
  59
  60   return w.ll;
  61 }