1 /* ashrdi3.c extracted from gcc-2.95.2/libgcc2.c which is: */ 2 /* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc. 3 4 This file is part of GNU CC. 5 6 GNU CC is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU CC is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. */ 15 16 #include <linux/compiler.h> 17 #include <linux/export.h> 18 19 #define BITS_PER_UNIT 8 20 21 typedef int SItype __mode(SI); 22 typedef unsigned int USItype __mode(SI); 23 typedef int DItype __mode(DI); 24 typedef int word_type __mode(__word__); 25 26 struct DIstruct {SItype high, low;}; 27 28 typedef union 29 { 30 struct DIstruct s; 31 DItype ll; 32 } DIunion; 33 34 DItype 35 __ashldi3 (DItype u, word_type b) 36 { 37 DIunion w; 38 word_type bm; 39 DIunion uu; 40 41 if (b == 0) 42 return u; 43 44 uu.ll = u; 45 46 bm = (sizeof (SItype) * BITS_PER_UNIT) - b; 47 if (bm <= 0) 48 { 49 w.s.low = 0; 50 w.s.high = (USItype)uu.s.low << -bm; 51 } 52 else 53 { 54 USItype carries = (USItype)uu.s.low >> bm; 55 w.s.low = (USItype)uu.s.low << b; 56 w.s.high = ((USItype)uu.s.high << b) | carries; 57 } 58 59 return w.ll; 60 } 61 EXPORT_SYMBOL(__ashldi3); 62