1 /* 2 * lib/lshrdi3.c 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program 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 License 15 * along with this program; if not, see the file COPYING, or write 16 * to the Free Software Foundation, Inc. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/libgcc.h> 21 22 long long notrace __lshrdi3(long long u, word_type b) 23 { 24 DWunion uu, w; 25 word_type bm; 26 27 if (b == 0) 28 return u; 29 30 uu.ll = u; 31 bm = 32 - b; 32 33 if (bm <= 0) { 34 w.s.high = 0; 35 w.s.low = (unsigned int) uu.s.high >> -bm; 36 } else { 37 const unsigned int carries = (unsigned int) uu.s.high << bm; 38 39 w.s.high = (unsigned int) uu.s.high >> b; 40 w.s.low = ((unsigned int) uu.s.low >> b) | carries; 41 } 42 43 return w.ll; 44 } 45 EXPORT_SYMBOL(__lshrdi3); 46