1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
/* ieee-utils/fp-irix.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000 Tim Mooney
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <math.h>
#include <ieeefp.h>
#include <gsl/gsl_ieee_utils.h>
#include <gsl/gsl_errno.h>
int
gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
{
fp_except mode = 0 ;
fp_rnd rnd = 0 ;
switch (precision)
{
case GSL_IEEE_SINGLE_PRECISION:
GSL_ERROR ("IRIX only supports default precision rounding",
GSL_EUNSUP) ;
break ;
case GSL_IEEE_DOUBLE_PRECISION:
GSL_ERROR ("IRIX only supports default precision rounding",
GSL_EUNSUP) ;
break ;
case GSL_IEEE_EXTENDED_PRECISION:
GSL_ERROR ("IRIX only supports default precision rounding",
GSL_EUNSUP) ;
break ;
}
switch (rounding)
{
case GSL_IEEE_ROUND_TO_NEAREST:
rnd = FP_RN ;
fpsetround (rnd) ;
break ;
case GSL_IEEE_ROUND_DOWN:
rnd = FP_RM ;
fpsetround (rnd) ;
break ;
case GSL_IEEE_ROUND_UP:
rnd = FP_RP ;
fpsetround (rnd) ;
break ;
case GSL_IEEE_ROUND_TO_ZERO:
rnd = FP_RZ ;
fpsetround (rnd) ;
break ;
default:
rnd = FP_RN ;
fpsetround (rnd) ;
}
/* Turn on all the exceptions apart from 'inexact' */
mode = FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL ;
if (exception_mask & GSL_IEEE_MASK_INVALID)
mode &= ~ FP_X_INV ;
if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
{
/* do nothing */
}
else
{
GSL_ERROR ("IRIX does not support the denormalized operand exception. "
"Use 'mask-denormalized' to work around this.",
GSL_EUNSUP) ;
}
if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
mode &= ~ FP_X_DZ ;
if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
mode &= ~ FP_X_OFL ;
if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
mode &= ~ FP_X_UFL ;
if (exception_mask & GSL_IEEE_TRAP_INEXACT)
{
mode |= FP_X_IMP ;
}
else
{
mode &= ~ FP_X_IMP ;
}
fpsetmask (mode) ;
return GSL_SUCCESS ;
}
|
