1/* 2 * File: arch/blackfin/lib/muldi3.c 3 * Based on: 4 * Author: 5 * 6 * Created: 7 * Description: 8 * 9 * Modified: 10 * Copyright 2004-2006 Analog Devices Inc. 11 * 12 * Bugs: Enter bugs at http://blackfin.uclinux.org/ 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or 17 * (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, see the file COPYING, or write 26 * to the Free Software Foundation, Inc., 27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 28 */ 29 30#ifndef SI_TYPE_SIZE 31#define SI_TYPE_SIZE 32 32#endif 33#define __ll_b (1L << (SI_TYPE_SIZE / 2)) 34#define __ll_lowpart(t) ((usitype) (t) % __ll_b) 35#define __ll_highpart(t) ((usitype) (t) / __ll_b) 36#define BITS_PER_UNIT 8 37 38#if !defined(umul_ppmm) 39#define umul_ppmm(w1, w0, u, v) \ 40 do { \ 41 usitype __x0, __x1, __x2, __x3; \ 42 usitype __ul, __vl, __uh, __vh; \ 43 \ 44 __ul = __ll_lowpart (u); \ 45 __uh = __ll_highpart (u); \ 46 __vl = __ll_lowpart (v); \ 47 __vh = __ll_highpart (v); \ 48 \ 49 __x0 = (usitype) __ul * __vl; \ 50 __x1 = (usitype) __ul * __vh; \ 51 __x2 = (usitype) __uh * __vl; \ 52 __x3 = (usitype) __uh * __vh; \ 53 \ 54 __x1 += __ll_highpart (__x0);/* this can't give carry */ \ 55 __x1 += __x2; /* but this indeed can */ \ 56 if (__x1 < __x2) /* did we get it? */ \ 57 __x3 += __ll_b; /* yes, add it in the proper pos. */ \ 58 \ 59 (w1) = __x3 + __ll_highpart (__x1); \ 60 (w0) = __ll_lowpart (__x1) * __ll_b + __ll_lowpart (__x0); \ 61 } while (0) 62#endif 63 64#if !defined(__umulsidi3) 65#define __umulsidi3(u, v) \ 66 ({diunion __w; \ 67 umul_ppmm (__w.s.high, __w.s.low, u, v); \ 68 __w.ll; }) 69#endif 70 71typedef unsigned int usitype __attribute__ ((mode(SI))); 72typedef int sitype __attribute__ ((mode(SI))); 73typedef int ditype __attribute__ ((mode(DI))); 74typedef int word_type __attribute__ ((mode(__word__))); 75 76struct distruct { 77 sitype low, high; 78}; 79typedef union { 80 struct distruct s; 81 ditype ll; 82} diunion; 83 84#ifdef CONFIG_ARITHMETIC_OPS_L1 85ditype __muldi3(ditype u, ditype v)__attribute__((l1_text)); 86#endif 87 88ditype __muldi3(ditype u, ditype v) 89{ 90 diunion w; 91 diunion uu, vv; 92 93 uu.ll = u, vv.ll = v; 94 w.ll = __umulsidi3(uu.s.low, vv.s.low); 95 w.s.high += ((usitype) uu.s.low * (usitype) vv.s.high 96 + (usitype) uu.s.high * (usitype) vv.s.low); 97 98 return w.ll; 99} 100