lib2-mul.c revision 1.1
1/* Copyright (C) 2012-2015 Free Software Foundation, Inc. 2 Contributed by Altera and Mentor Graphics, Inc. 3 4This file is free software; you can redistribute it and/or modify it 5under the terms of the GNU General Public License as published by the 6Free Software Foundation; either version 3, or (at your option) any 7later version. 8 9This file is distributed in the hope that it will be useful, but 10WITHOUT ANY WARRANTY; without even the implied warranty of 11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12General Public License for more details. 13 14Under Section 7 of GPL version 3, you are granted additional 15permissions described in the GCC Runtime Library Exception, version 163.1, as published by the Free Software Foundation. 17 18You should have received a copy of the GNU General Public License and 19a copy of the GCC Runtime Library Exception along with this program; 20see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 21<http://www.gnu.org/licenses/>. */ 22 23#include "lib2-nios2.h" 24 25/* 32-bit SI multiply for Nios II. */ 26 27SItype 28__mulsi3 (SItype a, SItype b) 29{ 30 SItype res = 0; 31 USItype cnt = a; 32 33 while (cnt) 34 { 35 if (cnt & 1) 36 res += b; 37 b <<= 1; 38 cnt >>= 1; 39 } 40 41 return res; 42} 43