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1da177e4 LT |
1 | /* More subroutines needed by GCC output code on some machines. */ |
2 | /* Compile this one with gcc. */ | |
3 | /* Copyright (C) 1989, 92-98, 1999 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 | /* As a special exception, if you link this library with other files, | |
23 | some of which are compiled with GCC, to produce an executable, | |
24 | this library does not by itself cause the resulting executable | |
25 | to be covered by the GNU General Public License. | |
26 | This exception does not however invalidate any other reasons why | |
27 | the executable file might be covered by the GNU General Public License. | |
28 | */ | |
29 | /* support functions required by the kernel. based on code from gcc-2.95.3 */ | |
30 | /* I Molton 29/07/01 */ | |
31 | ||
32 | #include "gcclib.h" | |
33 | ||
34 | DItype | |
35 | __lshrdi3 (DItype u, word_type b) | |
36 | { | |
37 | DIunion w; | |
38 | word_type bm; | |
39 | DIunion uu; | |
40 | ||
41 | if (b == 0) | |
42 | return u; | |
43 | ||
44 | uu.ll = u; | |
45 | ||
46 | bm = (sizeof (SItype) * BITS_PER_UNIT) - b; | |
47 | if (bm <= 0) | |
48 | { | |
49 | w.s.high = 0; | |
50 | w.s.low = (USItype)uu.s.high >> -bm; | |
51 | } | |
52 | else | |
53 | { | |
54 | USItype carries = (USItype)uu.s.high << bm; | |
55 | w.s.high = (USItype)uu.s.high >> b; | |
56 | w.s.low = ((USItype)uu.s.low >> b) | carries; | |
57 | } | |
58 | ||
59 | return w.ll; | |
60 | } | |
61 |