GNU Octave  3.8.0
A high-level interpreted language, primarily intended for numerical computations, mostly compatible with Matlab
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sun-utils.h
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1 /*
2 
3 Copyright (C) 1993-2013 John W. Eaton
4 
5 This file is part of Octave.
6 
7 Octave is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11 
12 Octave is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16 
17 You should have received a copy of the GNU General Public License
18 along with Octave; see the file COPYING. If not, see
19 <http://www.gnu.org/licenses/>.
20 
21 */
22 
23 #if !defined (octave_sun_utils_h)
24 #define octave_sun_utils_h 1
25 
26 // This is only needed to dereference pointers to doubles if mixing
27 // GCC and Sun SPARC f77/cc compiled code. See the GCC manual (where the
28 // function access_double() is described) and the Sun f77 manual,
29 // which explains that doubles are not always aligned on 8 byte
30 // boundaries.
31 
32 #if defined (__sparc) && defined (__GNUC__)
33 
34 inline double
35 access_double (double *unaligned_ptr)
36 {
37  union d2i { double d; int i[2]; };
38 
39  union d2i *p = (union d2i *) unaligned_ptr;
40  union d2i u;
41 
42  u.i[0] = p->i[0];
43  u.i[1] = p->i[1];
44 
45  return u.d;
46 }
47 
48 inline void
49 assign_double (double *unaligned_ptr, double value)
50 {
51  union d2i { double d; int i[2]; };
52 
53  double *ptr = &value;
54  union d2i *v = (union d2i *) ptr;
55  union d2i *p = (union d2i *) unaligned_ptr;
56 
57  p->i[0] = v->i[0];
58  p->i[1] = v->i[1];
59 }
60 
61 #endif
62 #endif