Remove some unnecessary inclusions of <sys/cdefs.h> across the tree.
[dragonfly.git] / lib / libm / arch / x86_64 / fenv.h
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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.h,v 1.7 2010/02/03 20:23:47 kib Exp $
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27 */
28
29#ifndef _FENV_H_
30#define _FENV_H_
31
32#include <sys/cdefs.h>
33#include <sys/types.h>
34
35typedef struct {
36 struct {
37 __uint32_t __control;
38 __uint32_t __status;
39 __uint32_t __tag;
40 char __other[16];
41 } __x87;
42 __uint32_t __mxcsr;
43} fenv_t;
44
45typedef __uint16_t fexcept_t;
46
47/* Exception flags */
48#define FE_INVALID 0x01
49#define FE_DENORMAL 0x02
50#define FE_DIVBYZERO 0x04
51#define FE_OVERFLOW 0x08
52#define FE_UNDERFLOW 0x10
53#define FE_INEXACT 0x20
54#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
55 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
56
57/* Rounding modes */
58#define FE_TONEAREST 0x0000
59#define FE_DOWNWARD 0x0400
60#define FE_UPWARD 0x0800
61#define FE_TOWARDZERO 0x0c00
62#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
63 FE_UPWARD | FE_TOWARDZERO)
64
65/*
66 * As compared to the x87 control word, the SSE unit's control word
67 * has the rounding control bits offset by 3 and the exception mask
68 * bits offset by 7.
69 */
70#define _SSE_ROUND_SHIFT 3
71#define _SSE_EMASK_SHIFT 7
72
73__BEGIN_DECLS
74
75/* Default floating-point environment */
76extern const fenv_t __fe_dfl_env;
77#define FE_DFL_ENV (&__fe_dfl_env)
78
79#define __fldcw(__cw) __asm __volatile("fldcw %0" : : "m" (__cw))
80#define __fldenv(__env) __asm __volatile("fldenv %0" : : "m" (__env))
81#define __fldenvx(__env) __asm __volatile("fldenv %0" : : "m" (__env) \
82 : "st", "st(1)", "st(2)", "st(3)", "st(4)", \
83 "st(5)", "st(6)", "st(7)")
84#define __fnclex() __asm __volatile("fnclex")
85#define __fnstenv(__env) __asm __volatile("fnstenv %0" : "=m" (*(__env)))
86#define __fnstcw(__cw) __asm __volatile("fnstcw %0" : "=m" (*(__cw)))
87#define __fnstsw(__sw) __asm __volatile("fnstsw %0" : "=am" (*(__sw)))
88#define __fwait() __asm __volatile("fwait")
89#define __ldmxcsr(__csr) __asm __volatile("ldmxcsr %0" : : "m" (__csr))
90#define __stmxcsr(__csr) __asm __volatile("stmxcsr %0" : "=m" (*(__csr)))
91
92static __inline int
93feclearexcept(int __excepts)
94{
95 fenv_t __env;
96
97 if (__excepts == FE_ALL_EXCEPT) {
98 __fnclex();
99 } else {
100 __fnstenv(&__env.__x87);
101 __env.__x87.__status &= ~__excepts;
102 __fldenv(__env.__x87);
103 }
104 __stmxcsr(&__env.__mxcsr);
105 __env.__mxcsr &= ~__excepts;
106 __ldmxcsr(__env.__mxcsr);
107 return (0);
108}
109
110static __inline int
111fegetexceptflag(fexcept_t *__flagp, int __excepts)
112{
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113 __uint32_t __mxcsr;
114 __uint16_t __status;
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115
116 __stmxcsr(&__mxcsr);
117 __fnstsw(&__status);
118 *__flagp = (__mxcsr | __status) & __excepts;
119 return (0);
120}
121
122int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
123int feraiseexcept(int __excepts);
124
125static __inline int
126fetestexcept(int __excepts)
127{
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128 __uint32_t __mxcsr;
129 __uint16_t __status;
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130
131 __stmxcsr(&__mxcsr);
132 __fnstsw(&__status);
133 return ((__status | __mxcsr) & __excepts);
134}
135
136static __inline int
137fegetround(void)
138{
6b038396 139 __uint16_t __control;
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140
141 /*
142 * We assume that the x87 and the SSE unit agree on the
143 * rounding mode. Reading the control word on the x87 turns
144 * out to be about 5 times faster than reading it on the SSE
145 * unit on an Opteron 244.
146 */
147 __fnstcw(&__control);
148 return (__control & _ROUND_MASK);
149}
150
151static __inline int
152fesetround(int __round)
153{
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154 __uint32_t __mxcsr;
155 __uint16_t __control;
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156
157 if (__round & ~_ROUND_MASK)
158 return (-1);
159
160 __fnstcw(&__control);
161 __control &= ~_ROUND_MASK;
162 __control |= __round;
163 __fldcw(__control);
164
165 __stmxcsr(&__mxcsr);
166 __mxcsr &= ~(_ROUND_MASK << _SSE_ROUND_SHIFT);
167 __mxcsr |= __round << _SSE_ROUND_SHIFT;
168 __ldmxcsr(__mxcsr);
169
170 return (0);
171}
172
173int fegetenv(fenv_t *__envp);
174int feholdexcept(fenv_t *__envp);
175
176static __inline int
177fesetenv(const fenv_t *__envp)
178{
179
180 /*
181 * XXX Using fldenvx() instead of fldenv() tells the compiler that this
182 * instruction clobbers the i387 register stack. This happens because
183 * we restore the tag word from the saved environment. Normally, this
184 * would happen anyway and we wouldn't care, because the ABI allows
185 * function calls to clobber the i387 regs. However, fesetenv() is
186 * inlined, so we need to be more careful.
187 */
188 __fldenvx(__envp->__x87);
189 __ldmxcsr(__envp->__mxcsr);
190 return (0);
191}
192
193int feupdateenv(const fenv_t *__envp);
194
195#if __BSD_VISIBLE
196
197int feenableexcept(int __mask);
198int fedisableexcept(int __mask);
199
200static __inline int
201fegetexcept(void)
202{
3eac7944 203 __uint16_t __control;
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204
205 /*
206 * We assume that the masks for the x87 and the SSE unit are
207 * the same.
208 */
209 __fnstcw(&__control);
210 return (~__control & FE_ALL_EXCEPT);
211}
212
213#endif /* __BSD_VISIBLE */
214
215__END_DECLS
216
217#endif /* !_FENV_H_ */