2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/_types.h>
35 #include <machine/endian.h>
38 #define __fenv_static static
41 typedef __uint32_t fenv_t;
42 typedef __uint32_t fexcept_t;
46 #define FE_OVERFLOW 0x00000100
47 #define FE_UNDERFLOW 0x00000200
48 #define FE_DIVBYZERO 0x00000400
49 #define FE_INVALID 0x00000800
50 #define FE_INEXACT 0x00001000
52 #define FE_ALL_INVALID FE_INVALID
54 #define _FPUSW_SHIFT 6
56 #define FE_INEXACT 0x02000000
57 #define FE_DIVBYZERO 0x04000000
58 #define FE_UNDERFLOW 0x08000000
59 #define FE_OVERFLOW 0x10000000
60 #define FE_INVALID 0x20000000 /* all types of invalid FP ops */
63 * The PowerPC architecture has extra invalid flags that indicate the
64 * specific type of invalid operation occurred. These flags may be
65 * tested, set, and cleared---but not masked---separately. All of
66 * these bits are cleared when FE_INVALID is cleared, but only
67 * FE_VXSOFT is set when FE_INVALID is explicitly set in software.
69 #define FE_VXCVI 0x00000100 /* invalid integer convert */
70 #define FE_VXSQRT 0x00000200 /* square root of a negative */
71 #define FE_VXSOFT 0x00000400 /* software-requested exception */
72 #define FE_VXVC 0x00080000 /* ordered comparison involving NaN */
73 #define FE_VXIMZ 0x00100000 /* inf * 0 */
74 #define FE_VXZDZ 0x00200000 /* 0 / 0 */
75 #define FE_VXIDI 0x00400000 /* inf / inf */
76 #define FE_VXISI 0x00800000 /* inf - inf */
77 #define FE_VXSNAN 0x01000000 /* operation on a signalling NaN */
78 #define FE_ALL_INVALID (FE_VXCVI | FE_VXSQRT | FE_VXSOFT | FE_VXVC | \
79 FE_VXIMZ | FE_VXZDZ | FE_VXIDI | FE_VXISI | \
80 FE_VXSNAN | FE_INVALID)
82 #define _FPUSW_SHIFT 22
84 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \
85 FE_ALL_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
88 #define FE_TONEAREST 0x0000
89 #define FE_TOWARDZERO 0x0001
90 #define FE_UPWARD 0x0002
91 #define FE_DOWNWARD 0x0003
92 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \
93 FE_UPWARD | FE_TOWARDZERO)
97 /* Default floating-point environment */
98 extern const fenv_t __fe_dfl_env;
99 #define FE_DFL_ENV (&__fe_dfl_env)
101 /* We need to be able to map status flag positions to mask flag positions */
102 #define _ENABLE_MASK ((FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \
103 FE_OVERFLOW | FE_UNDERFLOW) >> _FPUSW_SHIFT)
107 #define __mffs(__env) \
108 __asm __volatile("mfspr %0, 512" : "=r" ((__env)->__bits.__reg))
109 #define __mtfsf(__env) \
110 __asm __volatile("mtspr 512,%0;isync" :: "r" ((__env).__bits.__reg))
112 #define __mffs(__env) \
113 __asm __volatile("mffs %0" : "=f" ((__env)->__d))
114 #define __mtfsf(__env) \
115 __asm __volatile("mtfsf 255,%0" :: "f" ((__env).__d))
118 #define __mffs(__env)
119 #define __mtfsf(__env)
125 #if _BYTE_ORDER == _LITTLE_ENDIAN
135 __fenv_static inline int
136 feclearexcept(int __excepts)
140 if (__excepts & FE_INVALID)
141 __excepts |= FE_ALL_INVALID;
143 __r.__bits.__reg &= ~__excepts;
148 __fenv_static inline int
149 fegetexceptflag(fexcept_t *__flagp, int __excepts)
154 *__flagp = __r.__bits.__reg & __excepts;
158 __fenv_static inline int
159 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
163 if (__excepts & FE_INVALID)
164 __excepts |= FE_ALL_INVALID;
166 __r.__bits.__reg &= ~__excepts;
167 __r.__bits.__reg |= *__flagp & __excepts;
173 extern int feraiseexcept(int __excepts);
175 __fenv_static inline int
176 feraiseexcept(int __excepts)
180 if (__excepts & FE_INVALID)
181 __excepts |= FE_VXSOFT;
183 __r.__bits.__reg |= __excepts;
189 __fenv_static inline int
190 fetestexcept(int __excepts)
195 return (__r.__bits.__reg & __excepts);
198 __fenv_static inline int
204 return (__r.__bits.__reg & _ROUND_MASK);
207 __fenv_static inline int
208 fesetround(int __round)
212 if (__round & ~_ROUND_MASK)
215 __r.__bits.__reg &= ~_ROUND_MASK;
216 __r.__bits.__reg |= __round;
221 __fenv_static inline int
222 fegetenv(fenv_t *__envp)
227 *__envp = __r.__bits.__reg;
231 __fenv_static inline int
232 feholdexcept(fenv_t *__envp)
237 *__envp = __r.__bits.__reg;
238 __r.__bits.__reg &= ~(FE_ALL_EXCEPT | _ENABLE_MASK);
243 __fenv_static inline int
244 fesetenv(const fenv_t *__envp)
248 __r.__bits.__reg = *__envp;
253 __fenv_static inline int
254 feupdateenv(const fenv_t *__envp)
259 __r.__bits.__reg &= FE_ALL_EXCEPT;
260 __r.__bits.__reg |= *__envp;
267 /* We currently provide no external definitions of the functions below. */
270 feenableexcept(int __mask)
276 __oldmask = __r.__bits.__reg;
277 __r.__bits.__reg |= (__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT;
279 return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT);
283 fedisableexcept(int __mask)
289 __oldmask = __r.__bits.__reg;
290 __r.__bits.__reg &= ~((__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT);
292 return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT);
301 return ((__r.__bits.__reg & _ENABLE_MASK) << _FPUSW_SHIFT);
304 #endif /* __BSD_VISIBLE */
308 #endif /* !_FENV_H_ */