Remove some unnecessary inclusions of <sys/cdefs.h> across the tree.
[dragonfly.git] / lib / libm / arch / x86_64 / fenv.c
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1/*-
2 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
6b038396 26 * $FreeBSD: src/lib/msun/amd64/fenv.c,v 1.5 2010/02/03 20:23:47 kib Exp $
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27 */
28
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29#include <sys/types.h>
30#include <machine/npx.h>
31#include "fenv.h"
32
33const fenv_t __fe_dfl_env = {
34 { 0xffff0000 | __INITIAL_FPUCW__,
35 0xffff0000,
36 0xffffffff,
37 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
38 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff }
39 },
40 __INITIAL_MXCSR__
41};
42
43int
44fesetexceptflag(const fexcept_t *flagp, int excepts)
45{
46 fenv_t env;
47
48 __fnstenv(&env.__x87);
49 env.__x87.__status &= ~excepts;
50 env.__x87.__status |= *flagp & excepts;
51 __fldenv(env.__x87);
52
53 __stmxcsr(&env.__mxcsr);
54 env.__mxcsr &= ~excepts;
55 env.__mxcsr |= *flagp & excepts;
56 __ldmxcsr(env.__mxcsr);
57
58 return (0);
59}
60
61int
62feraiseexcept(int excepts)
63{
64 fexcept_t ex = excepts;
65
66 fesetexceptflag(&ex, excepts);
67 __fwait();
68 return (0);
69}
70
71int
72fegetenv(fenv_t *envp)
73{
74
75 __fnstenv(&envp->__x87);
76 __stmxcsr(&envp->__mxcsr);
77 /*
78 * fnstenv masks all exceptions, so we need to restore the
79 * control word to avoid this side effect.
80 */
81 __fldcw(envp->__x87.__control);
82 return (0);
83}
84
85int
86feholdexcept(fenv_t *envp)
87{
6b038396 88 __uint32_t mxcsr;
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89
90 __stmxcsr(&mxcsr);
91 __fnstenv(&envp->__x87);
92 __fnclex();
93 envp->__mxcsr = mxcsr;
94 mxcsr &= ~FE_ALL_EXCEPT;
95 mxcsr |= FE_ALL_EXCEPT << _SSE_EMASK_SHIFT;
96 __ldmxcsr(mxcsr);
97 return (0);
98}
99
100int
101feupdateenv(const fenv_t *envp)
102{
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103 __uint32_t mxcsr;
104 __uint16_t status;
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105
106 __fnstsw(&status);
107 __stmxcsr(&mxcsr);
108 fesetenv(envp);
109 feraiseexcept((mxcsr | status) & FE_ALL_EXCEPT);
110 return (0);
111}
112
113int
114__feenableexcept(int mask)
115{
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116 __uint32_t mxcsr, omask;
117 __uint16_t control;
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118
119 mask &= FE_ALL_EXCEPT;
120 __fnstcw(&control);
121 __stmxcsr(&mxcsr);
122 omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
123 control &= ~mask;
124 __fldcw(control);
125 mxcsr &= ~(mask << _SSE_EMASK_SHIFT);
126 __ldmxcsr(mxcsr);
127 return (~omask);
128}
129
130int
131__fedisableexcept(int mask)
132{
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133 __uint32_t mxcsr, omask;
134 __uint16_t control;
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135
136 mask &= FE_ALL_EXCEPT;
137 __fnstcw(&control);
138 __stmxcsr(&mxcsr);
139 omask = (control | mxcsr >> _SSE_EMASK_SHIFT) & FE_ALL_EXCEPT;
140 control |= mask;
141 __fldcw(control);
142 mxcsr |= mask << _SSE_EMASK_SHIFT;
143 __ldmxcsr(mxcsr);
144 return (~omask);
145}
146
147__weak_reference(__feenableexcept, feenableexcept);
148__weak_reference(__fedisableexcept, fedisableexcept);