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 * 26 * $FreeBSD$ 27 */ 28 29#ifndef _FENV_H_ 30#define _FENV_H_ 31 32#include <sys/_types.h> 33 34#ifndef __fenv_static 35#define __fenv_static static 36#endif 37 38typedef __uint32_t fenv_t; 39typedef __uint32_t fexcept_t; 40 41/* Exception flags */ 42#define FE_INEXACT 0x02000000 43#define FE_DIVBYZERO 0x04000000 44#define FE_UNDERFLOW 0x08000000 45#define FE_OVERFLOW 0x10000000 46#define FE_INVALID 0x20000000 /* all types of invalid FP ops */ 47 48/* 49 * The PowerPC architecture has extra invalid flags that indicate the 50 * specific type of invalid operation occurred. These flags may be 51 * tested, set, and cleared---but not masked---separately. All of 52 * these bits are cleared when FE_INVALID is cleared, but only 53 * FE_VXSOFT is set when FE_INVALID is explicitly set in software. 54 */ 55#define FE_VXCVI 0x00000100 /* invalid integer convert */ 56#define FE_VXSQRT 0x00000200 /* square root of a negative */ 57#define FE_VXSOFT 0x00000400 /* software-requested exception */ 58#define FE_VXVC 0x00080000 /* ordered comparison involving NaN */ 59#define FE_VXIMZ 0x00100000 /* inf * 0 */ 60#define FE_VXZDZ 0x00200000 /* 0 / 0 */ 61#define FE_VXIDI 0x00400000 /* inf / inf */ 62#define FE_VXISI 0x00800000 /* inf - inf */ 63#define FE_VXSNAN 0x01000000 /* operation on a signalling NaN */ 64#define FE_ALL_INVALID (FE_VXCVI | FE_VXSQRT | FE_VXSOFT | FE_VXVC | \ 65 FE_VXIMZ | FE_VXZDZ | FE_VXIDI | FE_VXISI | \ 66 FE_VXSNAN | FE_INVALID) 67#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 68 FE_ALL_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 69 70/* Rounding modes */ 71#define FE_TONEAREST 0x0000 72#define FE_TOWARDZERO 0x0001 73#define FE_UPWARD 0x0002 74#define FE_DOWNWARD 0x0003 75#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 76 FE_UPWARD | FE_TOWARDZERO) 77 78__BEGIN_DECLS 79 80/* Default floating-point environment */ 81extern const fenv_t __fe_dfl_env; 82#define FE_DFL_ENV (&__fe_dfl_env) 83 84/* We need to be able to map status flag positions to mask flag positions */ 85#define _FPUSW_SHIFT 22 86#define _ENABLE_MASK ((FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \ 87 FE_OVERFLOW | FE_UNDERFLOW) >> _FPUSW_SHIFT) 88 89#ifndef _SOFT_FLOAT 90#define __mffs(__env) __asm __volatile("mffs %0" : "=f" (*(__env))) 91#define __mtfsf(__env) __asm __volatile("mtfsf 255,%0" : : "f" (__env)) 92#else 93#define __mffs(__env) 94#define __mtfsf(__env) 95#endif 96 97union __fpscr { 98 double __d; 99 struct { 100 __uint32_t __junk; 101 fenv_t __reg; 102 } __bits; 103}; 104 105__fenv_static inline int 106feclearexcept(int __excepts) 107{ 108 union __fpscr __r; 109 110 if (__excepts & FE_INVALID) 111 __excepts |= FE_ALL_INVALID; 112 __mffs(&__r.__d); 113 __r.__bits.__reg &= ~__excepts; 114 __mtfsf(__r.__d); 115 return (0); 116} 117 118__fenv_static inline int 119fegetexceptflag(fexcept_t *__flagp, int __excepts) 120{ 121 union __fpscr __r; 122 123 __mffs(&__r.__d); 124 *__flagp = __r.__bits.__reg & __excepts; 125 return (0); 126} 127 128__fenv_static inline int 129fesetexceptflag(const fexcept_t *__flagp, int __excepts) 130{ 131 union __fpscr __r; 132 133 if (__excepts & FE_INVALID) 134 __excepts |= FE_ALL_EXCEPT; 135 __mffs(&__r.__d); 136 __r.__bits.__reg &= ~__excepts; 137 __r.__bits.__reg |= *__flagp & __excepts; 138 __mtfsf(__r.__d); 139 return (0); 140} 141 142__fenv_static inline int 143feraiseexcept(int __excepts) 144{ 145 union __fpscr __r; 146 147 if (__excepts & FE_INVALID) 148 __excepts |= FE_VXSOFT; 149 __mffs(&__r.__d); 150 __r.__bits.__reg |= __excepts; 151 __mtfsf(__r.__d); 152 return (0); 153} 154 155__fenv_static inline int 156fetestexcept(int __excepts) 157{ 158 union __fpscr __r; 159 160 __mffs(&__r.__d); 161 return (__r.__bits.__reg & __excepts); 162} 163 164__fenv_static inline int 165fegetround(void) 166{ 167 union __fpscr __r; 168 169 __mffs(&__r.__d); 170 return (__r.__bits.__reg & _ROUND_MASK); 171} 172 173__fenv_static inline int 174fesetround(int __round) 175{ 176 union __fpscr __r; 177 178 if (__round & ~_ROUND_MASK) 179 return (-1); 180 __mffs(&__r.__d); 181 __r.__bits.__reg &= ~_ROUND_MASK; 182 __r.__bits.__reg |= __round; 183 __mtfsf(__r.__d); 184 return (0); 185} 186 187__fenv_static inline int 188fegetenv(fenv_t *__envp) 189{ 190 union __fpscr __r; 191 192 __mffs(&__r.__d); 193 *__envp = __r.__bits.__reg; 194 return (0); 195} 196 197__fenv_static inline int 198feholdexcept(fenv_t *__envp) 199{ 200 union __fpscr __r; 201 202 __mffs(&__r.__d); 203 *__envp = __r.__d; 204 __r.__bits.__reg &= ~(FE_ALL_EXCEPT | _ENABLE_MASK); 205 __mtfsf(__r.__d); 206 return (0); 207} 208 209__fenv_static inline int 210fesetenv(const fenv_t *__envp) 211{ 212 union __fpscr __r; 213 214 __r.__bits.__reg = *__envp; 215 __mtfsf(__r.__d); 216 return (0); 217} 218 219__fenv_static inline int 220feupdateenv(const fenv_t *__envp) 221{ 222 union __fpscr __r; 223 224 __mffs(&__r.__d); 225 __r.__bits.__reg &= FE_ALL_EXCEPT; 226 __r.__bits.__reg |= *__envp; 227 __mtfsf(__r.__d); 228 return (0); 229} 230 231#if __BSD_VISIBLE 232 233/* We currently provide no external definitions of the functions below. */ 234 235static inline int 236feenableexcept(int __mask) 237{ 238 union __fpscr __r; 239 fenv_t __oldmask; 240 241 __mffs(&__r.__d); 242 __oldmask = __r.__bits.__reg; 243 __r.__bits.__reg |= (__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT; 244 __mtfsf(__r.__d); 245 return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT); 246} 247 248static inline int 249fedisableexcept(int __mask) 250{ 251 union __fpscr __r; 252 fenv_t __oldmask; 253 254 __mffs(&__r.__d); 255 __oldmask = __r.__bits.__reg; 256 __r.__bits.__reg &= ~((__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT); 257 __mtfsf(__r.__d); 258 return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT); 259} 260 261static inline int 262fegetexcept(void) 263{ 264 union __fpscr __r; 265 266 __mffs(&__r.__d); 267 return ((__r.__bits.__reg & _ENABLE_MASK) << _FPUSW_SHIFT); 268} 269 270#endif /* __BSD_VISIBLE */ 271 272__END_DECLS 273 274#endif /* !_FENV_H_ */ 275