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
37#ifndef _MACHINE_IEEEFP_H_
38#define _MACHINE_IEEEFP_H_
39
40/* Deprecated historical FPU control interface */
41
42#include <x86/x86_ieeefp.h>
43
44static __inline fp_rnd_t
45fpgetround(void)
46{
47 unsigned short _cw;
48
49 __fnstcw(&_cw);
50 return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF));
51}
52
53static __inline fp_rnd_t
54fpsetround(fp_rnd_t _m)
55{
56 fp_rnd_t _p;
57 unsigned short _cw, _newcw;
58
59 __fnstcw(&_cw);
60 _p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF);
61 _newcw = _cw & ~FP_RND_FLD;
62 _newcw |= (_m << FP_RND_OFF) & FP_RND_FLD;
63 __fnldcw(_cw, _newcw);
64 return (_p);
65}
66
67static __inline fp_prec_t
68fpgetprec(void)
69{
70 unsigned short _cw;
71
72 __fnstcw(&_cw);
73 return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF));
74}
75
76static __inline fp_prec_t
77fpsetprec(fp_prec_t _m)
78{
79 fp_prec_t _p;
80 unsigned short _cw, _newcw;
81
82 __fnstcw(&_cw);
83 _p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF);
84 _newcw = _cw & ~FP_PRC_FLD;
85 _newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD;
86 __fnldcw(_cw, _newcw);
87 return (_p);
88}
89
90/*
91 * Get or set the exception mask.
92 * Note that the x87 mask bits are inverted by the API -- a mask bit of 1
93 * means disable for x87 and SSE, but for fp*mask() it means enable.
94 */
95
96static __inline fp_except_t
97fpgetmask(void)
98{
99 unsigned short _cw;
100
101 __fnstcw(&_cw);
102 return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF);
103}
104
105static __inline fp_except_t
106fpsetmask(fp_except_t _m)
107{
108 fp_except_t _p;
109 unsigned short _cw, _newcw;
110
111 __fnstcw(&_cw);
112 _p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF;
113 _newcw = _cw & ~FP_MSKS_FLD;
114 _newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD;
115 __fnldcw(_cw, _newcw);
116 return (_p);
117}
118
119static __inline fp_except_t
120fpgetsticky(void)
121{
122 unsigned _ex;
123 unsigned short _sw;
124
125 __fnstsw(&_sw);
126 _ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF;
127 return ((fp_except_t)_ex);
128}
129
130static __inline fp_except_t
131fpresetsticky(fp_except_t _m)
132{
133 struct {
134 unsigned _cw;
135 unsigned _sw;
136 unsigned _other[5];
137 } _env;
138 fp_except_t _p;
139
140 _m &= FP_STKY_FLD >> FP_STKY_OFF;
141 _p = fpgetsticky();
142 if ((_p & ~_m) == _p)
143 return (_p);
144 if ((_p & ~_m) == 0) {
145 __fnclex();
146 return (_p);
147 }
148 __fnstenv(&_env);
149 _env._sw &= ~_m;
150 __fldenv(&_env);
151 return (_p);
152}
153
154#endif /* !_MACHINE_IEEEFP_H_ */