1 /* ashrdi3.c extracted from gcc-2.7.2/libgcc2.c which is: */
2 /* Copyright (C) 1989, 1992, 1993, 1994, 1995 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 Licence 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
14 GNU General Public Licence for more details.
15
16 You should have received a copy of the GNU General Public Licence
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21 #define BITS_PER_UNIT 8
22
23 typedef int SItype __attribute__((mode(SI)));
24 typedef unsigned int USItype __attribute__((mode(SI)));
25 typedef int DItype __attribute__((mode(DI)));
26 typedef int word_type __attribute__((mode(__word__)));
27
28 struct DIstruct {
29 SItype low;
30 SItype high;
31 };
32
33 union DIunion {
34 struct DIstruct s;
35 DItype ll;
36 };
37
__ashrdi3(DItype u,word_type b)38 DItype __ashrdi3(DItype u, word_type b)
39 {
40 union DIunion w;
41 union DIunion uu;
42 word_type bm;
43
44 if (b == 0)
45 return u;
46
47 uu.ll = u;
48
49 bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
50 if (bm <= 0) {
51 /* w.s.high = 1..1 or 0..0 */
52 w.s.high = uu.s.high >> (sizeof(SItype) * BITS_PER_UNIT - 1);
53 w.s.low = uu.s.high >> -bm;
54 } else {
55 USItype carries = (USItype)uu.s.high << bm;
56 w.s.high = uu.s.high >> b;
57 w.s.low = ((USItype)uu.s.low >> b) | carries;
58 }
59
60 return w.ll;
61 }
62