projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 98d655a6 GU |
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 | You should have received a copy of the GNU General Public License | |
| 18 | along with GNU CC; see the file COPYING. If not, write to | |
| 19 | the Free Software Foundation, 59 Temple Place - Suite 330, | |
| 20 | Boston, MA 02111-1307, USA. */ | |
| 21 | ||
| 22 | #if defined(__mc68020__) || defined(__mc68030__) || \ | |
| 23 | defined(__mc68040__) || defined(__mc68060__) || defined(__mcpu32__) | |
| 24 | ||
| 25 | #define umul_ppmm(w1, w0, u, v) \ | |
| 26 | __asm__ ("mulu%.l %3,%1:%0" \ | |
| 27 | : "=d" ((USItype)(w0)), \ | |
| 28 | "=d" ((USItype)(w1)) \ | |
| 29 | : "%0" ((USItype)(u)), \ | |
| 30 | "dmi" ((USItype)(v))) | |
| 31 | ||
| 66d857b0 | 32 | #else |
| 98d655a6 GU |
33 | |
| 34 | #define SI_TYPE_SIZE 32 | |
| 35 | #define __BITS4 (SI_TYPE_SIZE / 4) | |
| 36 | #define __ll_B (1L << (SI_TYPE_SIZE / 2)) | |
| 37 | #define __ll_lowpart(t) ((USItype) (t) % __ll_B) | |
| 38 | #define __ll_highpart(t) ((USItype) (t) / __ll_B) | |
| 39 | ||
| 40 | #define umul_ppmm(w1, w0, u, v) \ | |
| 41 | do { \ | |
| 42 | USItype __x0, __x1, __x2, __x3; \ | |
| 43 | USItype __ul, __vl, __uh, __vh; \ | |
| 44 | \ | |
| 45 | __ul = __ll_lowpart (u); \ | |
| 46 | __uh = __ll_highpart (u); \ | |
| 47 | __vl = __ll_lowpart (v); \ | |
| 48 | __vh = __ll_highpart (v); \ | |
| 49 | \ | |
| 50 | __x0 = (USItype) __ul * __vl; \ | |
| 51 | __x1 = (USItype) __ul * __vh; \ | |
| 52 | __x2 = (USItype) __uh * __vl; \ | |
| 53 | __x3 = (USItype) __uh * __vh; \ | |
| 54 | \ | |
| 55 | __x1 += __ll_highpart (__x0);/* this can't give carry */ \ | |
| 56 | __x1 += __x2; /* but this indeed can */ \ | |
| 57 | if (__x1 < __x2) /* did we get it? */ \ | |
| 58 | __x3 += __ll_B; /* yes, add it in the proper pos. */ \ | |
| 59 | \ | |
| 60 | (w1) = __x3 + __ll_highpart (__x1); \ | |
| 61 | (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \ | |
| 62 | } while (0) | |
| 63 | ||
| 66d857b0 | 64 | #endif |
| 98d655a6 GU |
65 | |
| 66 | #define __umulsidi3(u, v) \ | |
| 67 | ({DIunion __w; \ | |
| 68 | umul_ppmm (__w.s.high, __w.s.low, u, v); \ | |
| 69 | __w.ll; }) | |
| 70 | ||
| 71 | typedef int SItype __attribute__ ((mode (SI))); | |
| 72 | typedef unsigned int USItype __attribute__ ((mode (SI))); | |
| 73 | typedef int DItype __attribute__ ((mode (DI))); | |
| 74 | typedef int word_type __attribute__ ((mode (__word__))); | |
| 75 | ||
| 76 | struct DIstruct {SItype high, low;}; | |
| 77 | ||
| 78 | typedef union | |
| 79 | { | |
| 80 | struct DIstruct s; | |
| 81 | DItype ll; | |
| 82 | } DIunion; | |
| 83 | ||
| 84 | DItype | |
| 85 | __muldi3 (DItype u, DItype v) | |
| 86 | { | |
| 87 | DIunion w; | |
| 88 | DIunion uu, vv; | |
| 89 | ||
| 90 | uu.ll = u, | |
| 91 | vv.ll = v; | |
| 92 | ||
| 93 | w.ll = __umulsidi3 (uu.s.low, vv.s.low); | |
| 94 | w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high | |
| 95 | + (USItype) uu.s.high * (USItype) vv.s.low); | |
| 96 | ||
| 97 | return w.ll; | |
| 98 | } |