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/arch/v850/lib/ashldi3.c

https://bitbucket.org/evzijst/gittest
C | 62 lines | 34 code | 9 blank | 19 comment | 3 complexity | b987104ef27e3f4f1758d3144319d07f MD5 | raw file
 1/* ashldi3.c extracted from gcc-2.95.2/libgcc2.c which is: */
 2/* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc.
 3
 4This file is part of GNU CC.
 5
 6GNU CC is free software; you can redistribute it and/or modify
 7it under the terms of the GNU General Public License as published by
 8the Free Software Foundation; either version 2, or (at your option)
 9any later version.
10
11GNU CC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
20
21#define BITS_PER_UNIT 8
22
23typedef 	 int SItype	__attribute__ ((mode (SI)));
24typedef unsigned int USItype	__attribute__ ((mode (SI)));
25typedef		 int DItype	__attribute__ ((mode (DI)));
26typedef int word_type __attribute__ ((mode (__word__)));
27
28struct DIstruct {SItype high, low;};
29
30typedef union
31{
32  struct DIstruct s;
33  DItype ll;
34} DIunion;
35
36DItype
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}