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1da177e4 LT |
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 | |
d6410efa | 14 | GNU General Public License for more details. */ |
1da177e4 LT |
15 | |
16 | #define BITS_PER_UNIT 8 | |
17 | ||
18 | typedef int SItype __attribute__ ((mode (SI))); | |
19 | typedef unsigned int USItype __attribute__ ((mode (SI))); | |
20 | typedef int DItype __attribute__ ((mode (DI))); | |
21 | typedef int word_type __attribute__ ((mode (__word__))); | |
22 | ||
23 | struct DIstruct {SItype high, low;}; | |
24 | ||
25 | typedef union | |
26 | { | |
27 | struct DIstruct s; | |
28 | DItype ll; | |
29 | } DIunion; | |
30 | ||
31 | DItype | |
32 | __ashldi3 (DItype u, word_type b) | |
33 | { | |
34 | DIunion w; | |
35 | word_type bm; | |
36 | DIunion uu; | |
37 | ||
38 | if (b == 0) | |
39 | return u; | |
40 | ||
41 | uu.ll = u; | |
42 | ||
43 | bm = (sizeof (SItype) * BITS_PER_UNIT) - b; | |
44 | if (bm <= 0) | |
45 | { | |
46 | w.s.low = 0; | |
47 | w.s.high = (USItype)uu.s.low << -bm; | |
48 | } | |
49 | else | |
50 | { | |
51 | USItype carries = (USItype)uu.s.low >> bm; | |
52 | w.s.low = (USItype)uu.s.low << b; | |
53 | w.s.high = ((USItype)uu.s.high << b) | carries; | |
54 | } | |
55 | ||
56 | return w.ll; | |
57 | } |