master
1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 2003 Peter Wemm.
5 * Copyright (c) 1990 Andrew Moore, Talke Studio
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#) ieeefp.h 1.0 (Berkeley) 9/23/93
37 */
38
39#ifndef _MACHINE_IEEEFP_H_
40#define _MACHINE_IEEEFP_H_
41
42/* Deprecated historical FPU control interface */
43
44#include <x86/x86_ieeefp.h>
45
46static __inline fp_rnd_t
47fpgetround(void)
48{
49 unsigned short _cw;
50
51 __fnstcw(&_cw);
52 return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF));
53}
54
55static __inline fp_rnd_t
56fpsetround(fp_rnd_t _m)
57{
58 fp_rnd_t _p;
59 unsigned short _cw, _newcw;
60
61 __fnstcw(&_cw);
62 _p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF);
63 _newcw = _cw & ~FP_RND_FLD;
64 _newcw |= (_m << FP_RND_OFF) & FP_RND_FLD;
65 __fnldcw(_cw, _newcw);
66 return (_p);
67}
68
69static __inline fp_prec_t
70fpgetprec(void)
71{
72 unsigned short _cw;
73
74 __fnstcw(&_cw);
75 return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF));
76}
77
78static __inline fp_prec_t
79fpsetprec(fp_prec_t _m)
80{
81 fp_prec_t _p;
82 unsigned short _cw, _newcw;
83
84 __fnstcw(&_cw);
85 _p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF);
86 _newcw = _cw & ~FP_PRC_FLD;
87 _newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD;
88 __fnldcw(_cw, _newcw);
89 return (_p);
90}
91
92/*
93 * Get or set the exception mask.
94 * Note that the x87 mask bits are inverted by the API -- a mask bit of 1
95 * means disable for x87 and SSE, but for fp*mask() it means enable.
96 */
97
98static __inline fp_except_t
99fpgetmask(void)
100{
101 unsigned short _cw;
102
103 __fnstcw(&_cw);
104 return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF);
105}
106
107static __inline fp_except_t
108fpsetmask(fp_except_t _m)
109{
110 fp_except_t _p;
111 unsigned short _cw, _newcw;
112
113 __fnstcw(&_cw);
114 _p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF;
115 _newcw = _cw & ~FP_MSKS_FLD;
116 _newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD;
117 __fnldcw(_cw, _newcw);
118 return (_p);
119}
120
121static __inline fp_except_t
122fpgetsticky(void)
123{
124 unsigned _ex;
125 unsigned short _sw;
126
127 __fnstsw(&_sw);
128 _ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF;
129 return ((fp_except_t)_ex);
130}
131
132static __inline fp_except_t
133fpresetsticky(fp_except_t _m)
134{
135 struct {
136 unsigned _cw;
137 unsigned _sw;
138 unsigned _other[5];
139 } _env;
140 fp_except_t _p;
141
142 _m &= FP_STKY_FLD >> FP_STKY_OFF;
143 _p = fpgetsticky();
144 if ((_p & ~_m) == _p)
145 return (_p);
146 if ((_p & ~_m) == 0) {
147 __fnclex();
148 return (_p);
149 }
150 __fnstenv(&_env);
151 _env._sw &= ~_m;
152 __fldenv(&_env);
153 return (_p);
154}
155
156#endif /* !_MACHINE_IEEEFP_H_ */