1 /* muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and 2 gcc-2.7.2.3/longlong.h which is: */ 3 /* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. 4 5 This file is part of GNU CC. 6 7 GNU CC is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2, or (at your option) 10 any later version. 11 12 GNU CC is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. */ 16 17 #include <linux/compiler.h> 18 #include <linux/export.h> 19 20 #ifdef CONFIG_CPU_HAS_NO_MULDIV64 21 22 #define SI_TYPE_SIZE 32 23 #define __BITS4 (SI_TYPE_SIZE / 4) 24 #define __ll_B (1L << (SI_TYPE_SIZE / 2)) 25 #define __ll_lowpart(t) ((USItype) (t) % __ll_B) 26 #define __ll_highpart(t) ((USItype) (t) / __ll_B) 27 28 #define umul_ppmm(w1, w0, u, v) \ 29 do { \ 30 USItype __x0, __x1, __x2, __x3; \ 31 USItype __ul, __vl, __uh, __vh; \ 32 \ 33 __ul = __ll_lowpart (u); \ 34 __uh = __ll_highpart (u); \ 35 __vl = __ll_lowpart (v); \ 36 __vh = __ll_highpart (v); \ 37 \ 38 __x0 = (USItype) __ul * __vl; \ 39 __x1 = (USItype) __ul * __vh; \ 40 __x2 = (USItype) __uh * __vl; \ 41 __x3 = (USItype) __uh * __vh; \ 42 \ 43 __x1 += __ll_highpart (__x0);/* this can't give carry */ \ 44 __x1 += __x2; /* but this indeed can */ \ 45 if (__x1 < __x2) /* did we get it? */ \ 46 __x3 += __ll_B; /* yes, add it in the proper pos. */ \ 47 \ 48 (w1) = __x3 + __ll_highpart (__x1); \ 49 (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \ 50 } while (0) 51 52 #else 53 54 #define umul_ppmm(w1, w0, u, v) \ 55 __asm__ ("mulu%.l %3,%1:%0" \ 56 : "=d" ((USItype)(w0)), \ 57 "=d" ((USItype)(w1)) \ 58 : "%0" ((USItype)(u)), \ 59 "dmi" ((USItype)(v))) 60 61 #endif 62 63 #define __umulsidi3(u, v) \ 64 ({DIunion __w; \ 65 umul_ppmm (__w.s.high, __w.s.low, u, v); \ 66 __w.ll; }) 67 68 typedef int SItype __mode(SI); 69 typedef unsigned int USItype __mode(SI); 70 typedef int DItype __mode(DI); 71 typedef int word_type __mode(__word__); 72 73 struct DIstruct {SItype high, low;}; 74 75 typedef union 76 { 77 struct DIstruct s; 78 DItype ll; 79 } DIunion; 80 81 DItype 82 __muldi3 (DItype u, DItype v) 83 { 84 DIunion w; 85 DIunion uu, vv; 86 87 uu.ll = u; 88 vv.ll = v; 89 90 w.ll = __umulsidi3 (uu.s.low, vv.s.low); 91 w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high 92 + (USItype) uu.s.high * (USItype) vv.s.low); 93 94 return w.ll; 95 } 96 EXPORT_SYMBOL(__muldi3); 97