1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 15 * 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 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _FENV_H_ 32 #define _FENV_H_ 33 34 #include <sys/_types.h> 35 #include <machine/endian.h> 36 37 #ifndef __fenv_static 38 #define __fenv_static static 39 #endif 40 41 typedef __uint32_t fenv_t; 42 typedef __uint32_t fexcept_t; 43 44 /* Exception flags */ 45 #ifdef __SPE__ 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 51 52 #define FE_ALL_INVALID FE_INVALID 53 54 #define _FPUSW_SHIFT 6 55 #else 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 */ 61 62 /* 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. 68 */ 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) 81 82 #define _FPUSW_SHIFT 22 83 #endif 84 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 85 FE_ALL_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 86 87 /* Rounding modes */ 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) 94 95 __BEGIN_DECLS 96 97 /* Default floating-point environment */ 98 extern const fenv_t __fe_dfl_env; 99 #define FE_DFL_ENV (&__fe_dfl_env) 100 101 /* 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) 104 105 #ifndef _SOFT_FLOAT 106 #ifdef __SPE__ 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)) 111 #else 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)) 116 #endif 117 #else 118 #define __mffs(__env) 119 #define __mtfsf(__env) 120 #endif 121 122 union __fpscr { 123 double __d; 124 struct { 125 #if _BYTE_ORDER == _LITTLE_ENDIAN 126 fenv_t __reg; 127 __uint32_t __junk; 128 #else 129 __uint32_t __junk; 130 fenv_t __reg; 131 #endif 132 } __bits; 133 }; 134 135 __fenv_static inline int 136 feclearexcept(int __excepts) 137 { 138 union __fpscr __r; 139 140 if (__excepts & FE_INVALID) 141 __excepts |= FE_ALL_INVALID; 142 __mffs(&__r); 143 __r.__bits.__reg &= ~__excepts; 144 __mtfsf(__r); 145 return (0); 146 } 147 148 __fenv_static inline int 149 fegetexceptflag(fexcept_t *__flagp, int __excepts) 150 { 151 union __fpscr __r; 152 153 __mffs(&__r); 154 *__flagp = __r.__bits.__reg & __excepts; 155 return (0); 156 } 157 158 __fenv_static inline int 159 fesetexceptflag(const fexcept_t *__flagp, int __excepts) 160 { 161 union __fpscr __r; 162 163 if (__excepts & FE_INVALID) 164 __excepts |= FE_ALL_INVALID; 165 __mffs(&__r); 166 __r.__bits.__reg &= ~__excepts; 167 __r.__bits.__reg |= *__flagp & __excepts; 168 __mtfsf(__r); 169 return (0); 170 } 171 172 #ifdef __SPE__ 173 extern int feraiseexcept(int __excepts); 174 #else 175 __fenv_static inline int 176 feraiseexcept(int __excepts) 177 { 178 union __fpscr __r; 179 180 if (__excepts & FE_INVALID) 181 __excepts |= FE_VXSOFT; 182 __mffs(&__r); 183 __r.__bits.__reg |= __excepts; 184 __mtfsf(__r); 185 return (0); 186 } 187 #endif 188 189 __fenv_static inline int 190 fetestexcept(int __excepts) 191 { 192 union __fpscr __r; 193 194 __mffs(&__r); 195 return (__r.__bits.__reg & __excepts); 196 } 197 198 __fenv_static inline int 199 fegetround(void) 200 { 201 union __fpscr __r; 202 203 __mffs(&__r); 204 return (__r.__bits.__reg & _ROUND_MASK); 205 } 206 207 __fenv_static inline int 208 fesetround(int __round) 209 { 210 union __fpscr __r; 211 212 if (__round & ~_ROUND_MASK) 213 return (-1); 214 __mffs(&__r); 215 __r.__bits.__reg &= ~_ROUND_MASK; 216 __r.__bits.__reg |= __round; 217 __mtfsf(__r); 218 return (0); 219 } 220 221 __fenv_static inline int 222 fegetenv(fenv_t *__envp) 223 { 224 union __fpscr __r; 225 226 __mffs(&__r); 227 *__envp = __r.__bits.__reg; 228 return (0); 229 } 230 231 __fenv_static inline int 232 feholdexcept(fenv_t *__envp) 233 { 234 union __fpscr __r; 235 236 __mffs(&__r); 237 *__envp = __r.__bits.__reg; 238 __r.__bits.__reg &= ~(FE_ALL_EXCEPT | _ENABLE_MASK); 239 __mtfsf(__r); 240 return (0); 241 } 242 243 __fenv_static inline int 244 fesetenv(const fenv_t *__envp) 245 { 246 union __fpscr __r; 247 248 __r.__bits.__reg = *__envp; 249 __mtfsf(__r); 250 return (0); 251 } 252 253 __fenv_static inline int 254 feupdateenv(const fenv_t *__envp) 255 { 256 union __fpscr __r; 257 258 __mffs(&__r); 259 __r.__bits.__reg &= FE_ALL_EXCEPT; 260 __r.__bits.__reg |= *__envp; 261 __mtfsf(__r); 262 return (0); 263 } 264 265 #if __BSD_VISIBLE 266 267 __fenv_static inline int 268 feenableexcept(int __mask) 269 { 270 union __fpscr __r; 271 fenv_t __oldmask; 272 273 __mffs(&__r); 274 __oldmask = __r.__bits.__reg; 275 __r.__bits.__reg |= (__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT; 276 __mtfsf(__r); 277 return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT); 278 } 279 280 __fenv_static inline int 281 fedisableexcept(int __mask) 282 { 283 union __fpscr __r; 284 fenv_t __oldmask; 285 286 __mffs(&__r); 287 __oldmask = __r.__bits.__reg; 288 __r.__bits.__reg &= ~((__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT); 289 __mtfsf(__r); 290 return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT); 291 } 292 293 /* We currently provide no external definition of fegetexcept(). */ 294 static inline int 295 fegetexcept(void) 296 { 297 union __fpscr __r; 298 299 __mffs(&__r); 300 return ((__r.__bits.__reg & _ENABLE_MASK) << _FPUSW_SHIFT); 301 } 302 303 #endif /* __BSD_VISIBLE */ 304 305 __END_DECLS 306 307 #endif /* !_FENV_H_ */ 308