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
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
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 {SItype high, low;};
29
30 typedef union
31 {
32 struct DIstruct s;
33 DItype ll;
34 } DIunion;
35
36 DItype
__ashldi3(DItype u,word_type b)37 __ashldi3 (DItype u, word_type b)
38 {
39 DIunion w;
40 word_type bm;
41 DIunion uu;
42
43 if (b == 0)
44 return u;
45
46 uu.ll = u;
47
48 bm = (sizeof (SItype) * BITS_PER_UNIT) - b;
49 if (bm <= 0)
50 {
51 w.s.low = 0;
52 w.s.high = (USItype)uu.s.low << -bm;
53 }
54 else
55 {
56 USItype carries = (USItype)uu.s.low >> bm;
57 w.s.low = (USItype)uu.s.low << b;
58 w.s.high = ((USItype)uu.s.high << b) | carries;
59 }
60
61 return w.ll;
62 }
63