decLibrary.c revision 302408 
1/* Temporary library support for decimal floating point.
2   Copyright (C) 2005, 2006 Free Software Foundation, Inc.
3
4   This file is part of GCC.
5
6   GCC is free software; you can redistribute it and/or modify it
7   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   In addition to the permissions in the GNU General Public License,
12   the Free Software Foundation gives you unlimited permission to link
13   the compiled version of this file into combinations with other
14   programs, and to distribute those combinations without any
15   restriction coming from the use of this file.  (The General Public
16   License restrictions do apply in other respects; for example, they
17   cover modification of the file, and distribution when not linked
18   into a combine executable.)
19
20   GCC is distributed in the hope that it will be useful, but WITHOUT
21   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
22   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
23   License for more details.
24
25   You should have received a copy of the GNU General Public License
26   along with GCC; see the file COPYING.  If not, write to the Free
27   Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
28   02110-1301, USA.  */
29
30#include "config.h"
31#include "decContext.h"
32#include "decimal128.h"
33#include "decimal64.h"
34#include "decimal32.h"
35
36void __host_to_ieee_32 (_Decimal32, decimal32 *);
37void __host_to_ieee_64 (_Decimal64, decimal64 *);
38void __host_to_ieee_128 (_Decimal128, decimal128 *);
39
40extern int isinfd32 (_Decimal32);
41extern int isinfd64 (_Decimal64);
42extern int isinfd128 (_Decimal128);
43extern void __dfp_enable_traps (void);
44extern void __dfp_raise (int exception __attribute__ ((unused)));
45
46int
47isinfd32 (_Decimal32 arg)
48{
49  decNumber dn;
50  decimal32 d32;
51
52  __host_to_ieee_32 (arg, &d32);
53  decimal32ToNumber (&d32, &dn);
54  return (decNumberIsInfinite (&dn));
55}
56
57int
58isinfd64 (_Decimal64 arg)
59{
60  decNumber dn;
61  decimal64 d64;
62
63  __host_to_ieee_64 (arg, &d64);
64  decimal64ToNumber (&d64, &dn);
65  return (decNumberIsInfinite (&dn));
66}
67
68int
69isinfd128 (_Decimal128 arg)
70{
71  decNumber dn;
72  decimal128 d128;
73
74  __host_to_ieee_128 (arg, &d128);
75  decimal128ToNumber (&d128, &dn);
76  return (decNumberIsInfinite (&dn));
77}
78
79int __dfp_traps;
80
81void
82__dfp_enable_traps (void)
83{
84  __dfp_traps = 1;
85}
86
87void
88__dfp_raise (int exception __attribute__ ((unused)))
89{
90  raise (SIGFPE);
91}
92
93uint32_t
94__dec_byte_swap (uint32_t in)
95{
96  uint32_t out = 0;
97  unsigned char *p = (unsigned char *) &out;
98  union {
99    uint32_t i;
100    unsigned char b[4];
101  } u;
102
103  u.i = in;
104  p[0] = u.b[3];
105  p[1] = u.b[2];
106  p[2] = u.b[1];
107  p[3] = u.b[0];
108
109  return out;
110}
111