2 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
32 #include <sys/_types.h>
35 #define __fenv_static static
38 typedef __uint32_t fenv_t;
39 typedef __uint32_t fexcept_t;
43 #define _FPUSW_SHIFT 16
44 #define FE_INVALID 0x0001
45 #define FE_DIVBYZERO 0x0002
46 #define FE_OVERFLOW 0x0004
47 #define FE_UNDERFLOW 0x0008
48 #define FE_INEXACT 0x0010
50 #define _FCSR_CAUSE_SHIFT 10
51 #define FE_INVALID 0x0040
52 #define FE_DIVBYZERO 0x0020
53 #define FE_OVERFLOW 0x0010
54 #define FE_UNDERFLOW 0x0008
55 #define FE_INEXACT 0x0004
57 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
58 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
61 #define FE_TONEAREST 0x0000
62 #define FE_TOWARDZERO 0x0001
63 #define FE_UPWARD 0x0002
64 #define FE_DOWNWARD 0x0003
65 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
66 FE_UPWARD | FE_TOWARDZERO)
69 /* Default floating-point environment */
70 extern const fenv_t __fe_dfl_env;
71 #define FE_DFL_ENV (&__fe_dfl_env)
73 /* We need to be able to map status flag positions to mask flag positions */
74 #define _ENABLE_SHIFT 5
75 #define _ENABLE_MASK (FE_ALL_EXCEPT << _ENABLE_SHIFT)
78 #define __cfc1(__fcsr) __asm __volatile("cfc1 %0, $31" : "=r" (__fcsr))
79 #define __ctc1(__fcsr) __asm __volatile("ctc1 %0, $31" :: "r" (__fcsr))
83 int feclearexcept(int __excepts);
84 int fegetexceptflag(fexcept_t *__flagp, int __excepts);
85 int fesetexceptflag(const fexcept_t *__flagp, int __excepts);
86 int feraiseexcept(int __excepts);
87 int fetestexcept(int __excepts);
89 int fesetround(int __round);
90 int fegetenv(fenv_t *__envp);
91 int feholdexcept(fenv_t *__envp);
92 int fesetenv(const fenv_t *__envp);
93 int feupdateenv(const fenv_t *__envp);
95 __fenv_static inline int
96 feclearexcept(int __excepts)
100 __excepts &= FE_ALL_EXCEPT;
102 fcsr &= ~(__excepts | (__excepts << _FCSR_CAUSE_SHIFT));
108 __fenv_static inline int
109 fegetexceptflag(fexcept_t *__flagp, int __excepts)
113 __excepts &= FE_ALL_EXCEPT;
115 *__flagp = fcsr & __excepts;
120 __fenv_static inline int
121 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
125 __excepts &= FE_ALL_EXCEPT;
128 fcsr |= *__flagp & __excepts;
134 __fenv_static inline int
135 feraiseexcept(int __excepts)
139 __excepts &= FE_ALL_EXCEPT;
141 fcsr |= __excepts | (__excepts << _FCSR_CAUSE_SHIFT);
147 __fenv_static inline int
148 fetestexcept(int __excepts)
152 __excepts &= FE_ALL_EXCEPT;
155 return (fcsr & __excepts);
158 __fenv_static inline int
165 return (fcsr & _ROUND_MASK);
168 __fenv_static inline int
169 fesetround(int __round)
173 if (__round & ~_ROUND_MASK)
177 fcsr &= ~_ROUND_MASK;
184 __fenv_static inline int
185 fegetenv(fenv_t *__envp)
193 __fenv_static inline int
194 feholdexcept(fenv_t *__envp)
200 fcsr &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
206 __fenv_static inline int
207 fesetenv(const fenv_t *__envp)
215 __fenv_static inline int
216 feupdateenv(const fenv_t *__envp)
226 #endif /* !SOFTFLOAT */
230 /* We currently provide no external definitions of the functions below. */
233 int feenableexcept(int __mask);
234 int fedisableexcept(int __mask);
235 int fegetexcept(void);
238 feenableexcept(int __mask)
240 fenv_t __old_fcsr, __new_fcsr;
243 __new_fcsr = __old_fcsr | (__mask & FE_ALL_EXCEPT) << _ENABLE_SHIFT;
246 return ((__old_fcsr >> _ENABLE_SHIFT) & FE_ALL_EXCEPT);
250 fedisableexcept(int __mask)
252 fenv_t __old_fcsr, __new_fcsr;
255 __new_fcsr = __old_fcsr & ~((__mask & FE_ALL_EXCEPT) << _ENABLE_SHIFT);
258 return ((__old_fcsr >> _ENABLE_SHIFT) & FE_ALL_EXCEPT);
268 return ((fcsr & _ENABLE_MASK) >> _ENABLE_SHIFT);
271 #endif /* !SOFTFLOAT */
273 #endif /* __BSD_VISIBLE */
277 #endif /* !_FENV_H_ */