1 /* fp-openbsd.c
2 *
3 * Copyright (C) 2001 Jason Beegan
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or (at
8 * your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 */
19
20 #include <ieeefp.h>
21 #include "gsl_ieee_utils.h"
22 #include "gsl_errno.h"
23
24 /* This is a copy of fp-netbsd.c, modified for openbsd by Toby White
25 --- Brian Gough */
26
27 int
gsl_ieee_set_mode(int precision,int rounding,int exception_mask)28 gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
29 {
30 fp_except mode = 0;
31 fp_rnd rnd = 0;
32
33 switch (precision)
34 {
35 case GSL_IEEE_SINGLE_PRECISION:
36 GSL_ERROR ("OpenBSD only supports default precision rounding",
37 GSL_EUNSUP);
38 break;
39 case GSL_IEEE_DOUBLE_PRECISION:
40 GSL_ERROR ("OpenBSD only supports default precision rounding",
41 GSL_EUNSUP);
42 break;
43 case GSL_IEEE_EXTENDED_PRECISION:
44 GSL_ERROR ("OpenBSD only supports default precision rounding",
45 GSL_EUNSUP);
46 break;
47 }
48
49 switch (rounding)
50 {
51 case GSL_IEEE_ROUND_TO_NEAREST:
52 rnd = FP_RN;
53 fpsetround (rnd);
54 break;
55 case GSL_IEEE_ROUND_DOWN:
56 rnd = FP_RM;
57 fpsetround (rnd);
58 break;
59 case GSL_IEEE_ROUND_UP:
60 rnd = FP_RP;
61 fpsetround (rnd);
62 break;
63 case GSL_IEEE_ROUND_TO_ZERO:
64 rnd = FP_RZ;
65 fpsetround (rnd);
66 break;
67 default:
68 rnd = FP_RN;
69 fpsetround (rnd);
70 }
71
72 /* Turn on all available exceptions apart from 'inexact'.
73 Denormalized operand exception not available on all platforms. */
74
75 mode = FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL;
76 #ifdef FP_X_DNML
77 mode = mode | FP_X_DNML;
78 #endif
79
80 if (exception_mask & GSL_IEEE_MASK_INVALID)
81 mode &= ~ FP_X_INV;
82
83 if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
84 {
85 #ifdef FP_X_DNML
86 mode &= ~ FP_X_DNML;
87 #endif
88 }
89 else
90 {
91 #ifndef FP_X_DNML
92 GSL_ERROR ("OpenBSD does not support the denormalized operand exception on this platform. "
93 "Use 'mask-denormalized' to work around this.",
94 GSL_EUNSUP);
95 #endif
96 }
97
98 if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
99 mode &= ~ FP_X_DZ;
100
101 if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
102 mode &= ~ FP_X_OFL;
103
104 if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
105 mode &= ~ FP_X_UFL;
106
107 if (exception_mask & GSL_IEEE_TRAP_INEXACT)
108 {
109 mode |= FP_X_IMP;
110 }
111 else
112 {
113 mode &= ~ FP_X_IMP;
114 }
115
116 fpsetmask (mode);
117
118 return GSL_SUCCESS;
119
120 }
121
122