lib_nios2/mult.c

   1 /*
   2  * This file is part of GNU CC.
   3  *
   4  * GNU CC is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published
   6  * by the Free Software Foundation; either version 2, or (at your
   7  * option) any later version.
   8  *
   9  * GNU CC is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public
  15  * License along with GNU CC; see the file COPYING.  If not, write
  16  * to the Free Software Foundation, 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20
  21 #include <common.h>
  22
  23 #if !defined(CFG_NIOS_MULT_HW) && !defined(CFG_NIOS_MULT_MSTEP)
  24
  25 #include "math.h"
  26
  27 USItype __mulsi3 (USItype a, USItype b)
  28 {
  29         USItype c = 0;
  30
  31         while (a != 0) {
  32                 if (a & 1)
  33                         c += b;
  34                 a >>= 1;
  35                 b <<= 1;
  36         }
  37
  38         return c;
  39 }
  40
  41
  42 UHItype __mulhi3 (UHItype a, UHItype b)
  43 {
  44         UHItype c = 0;
  45
  46         while (a != 0) {
  47                 if (a & 1)
  48                         c += b;
  49                 a >>= 1;
  50                 b <<= 1;
  51         }
  52
  53         return c;
  54 }
  55
  56 #endif /*!defined(CFG_NIOS_MULT_HW) && !defined(CFG_NIOS_MULT_MSTEP) */