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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 | #define BITS_PER_UNIT 8 | |
23 | #define SI_TYPE_SIZE 32 | |
24 | ||
25 | #define __BITS4 (SI_TYPE_SIZE / 4) | |
26 | #define __ll_B (1L << (SI_TYPE_SIZE / 2)) | |
27 | #define __ll_lowpart(t) ((USItype) (t) % __ll_B) | |
28 | #define __ll_highpart(t) ((USItype) (t) / __ll_B) | |
29 | ||
30 | #define umul_ppmm(w1, w0, u, v) \ | |
31 | do { \ | |
32 | USItype __x0, __x1, __x2, __x3; \ | |
33 | USItype __ul, __vl, __uh, __vh; \ | |
34 | \ | |
35 | __ul = __ll_lowpart (u); \ | |
36 | __uh = __ll_highpart (u); \ | |
37 | __vl = __ll_lowpart (v); \ | |
38 | __vh = __ll_highpart (v); \ | |
39 | \ | |
40 | __x0 = (USItype) __ul * __vl; \ | |
41 | __x1 = (USItype) __ul * __vh; \ | |
42 | __x2 = (USItype) __uh * __vl; \ | |
43 | __x3 = (USItype) __uh * __vh; \ | |
44 | \ | |
45 | __x1 += __ll_highpart (__x0);/* this can't give carry */ \ | |
46 | __x1 += __x2; /* but this indeed can */ \ | |
47 | if (__x1 < __x2) /* did we get it? */ \ | |
48 | __x3 += __ll_B; /* yes, add it in the proper pos. */ \ | |
49 | \ | |
50 | (w1) = __x3 + __ll_highpart (__x1); \ | |
51 | (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \ | |
52 | } while (0) | |
53 | ||
54 | #define __umulsidi3(u, v) \ | |
55 | ({DIunion __w; \ | |
56 | umul_ppmm (__w.s.high, __w.s.low, u, v); \ | |
57 | __w.ll; }) | |
58 | ||
59 | typedef int SItype __attribute__ ((mode (SI))); | |
60 | typedef unsigned int USItype __attribute__ ((mode (SI))); | |
61 | typedef int DItype __attribute__ ((mode (DI))); | |
62 | typedef int word_type __attribute__ ((mode (__word__))); | |
63 | ||
64 | struct DIstruct {SItype high, low;}; | |
65 | ||
66 | typedef union | |
67 | { | |
68 | struct DIstruct s; | |
69 | DItype ll; | |
70 | } DIunion; | |
71 | ||
72 | DItype | |
73 | __muldi3 (DItype u, DItype v) | |
74 | { | |
75 | DIunion w; | |
76 | DIunion uu, vv; | |
77 | ||
78 | uu.ll = u, | |
79 | vv.ll = v; | |
80 | ||
81 | w.ll = __umulsidi3 (uu.s.low, vv.s.low); | |
82 | w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high | |
83 | + (USItype) uu.s.high * (USItype) vv.s.low); | |
84 | ||
85 | return w.ll; | |
86 | } |