projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1394f032 BW |
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 | ||
| 71 | typedef unsigned int usitype __attribute__ ((mode(SI))); | |
| 72 | typedef int sitype __attribute__ ((mode(SI))); | |
| 73 | typedef int ditype __attribute__ ((mode(DI))); | |
| 74 | typedef int word_type __attribute__ ((mode(__word__))); | |
| 75 | ||
| 76 | struct distruct { | |
| 77 | sitype low, high; | |
| 78 | }; | |
| 79 | typedef union { | |
| 80 | struct distruct s; | |
| 81 | ditype ll; | |
| 82 | } diunion; | |
| 83 | ||
| 84 | #ifdef CONFIG_ARITHMETIC_OPS_L1 | |
| 85 | ditype __muldi3(ditype u, ditype v)__attribute__((l1_text)); | |
| 86 | #endif | |
| 87 | ||
| 88 | ditype __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 | } |