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 #define FE_INEXACT 0x02000000 46 #define FE_DIVBYZERO 0x04000000 47 #define FE_UNDERFLOW 0x08000000 48 #define FE_OVERFLOW 0x10000000 49 #define FE_INVALID 0x20000000 /* all types of invalid FP ops */ 50 51 /* 52 * The PowerPC architecture has extra invalid flags that indicate the 53 * specific type of invalid operation occurred. These flags may be 54 * tested, set, and cleared---but not masked---separately. All of 55 * these bits are cleared when FE_INVALID is cleared, but only 56 * FE_VXSOFT is set when FE_INVALID is explicitly set in software. 57 */ 58 #define FE_VXCVI 0x00000100 /* invalid integer convert */ 59 #define FE_VXSQRT 0x00000200 /* square root of a negative */ 60 #define FE_VXSOFT 0x00000400 /* software-requested exception */ 61 #define FE_VXVC 0x00080000 /* ordered comparison involving NaN */ 62 #define FE_VXIMZ 0x00100000 /* inf * 0 */ 63 #define FE_VXZDZ 0x00200000 /* 0 / 0 */ 64 #define FE_VXIDI 0x00400000 /* inf / inf */ 65 #define FE_VXISI 0x00800000 /* inf - inf */ 66 #define FE_VXSNAN 0x01000000 /* operation on a signalling NaN */ 67 #define FE_ALL_INVALID (FE_VXCVI | FE_VXSQRT | FE_VXSOFT | FE_VXVC | \ 68 FE_VXIMZ | FE_VXZDZ | FE_VXIDI | FE_VXISI | \ 69 FE_VXSNAN | FE_INVALID) 70 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 71 FE_ALL_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 72 73 /* Rounding modes */ 74 #define FE_TONEAREST 0x0000 75 #define FE_TOWARDZERO 0x0001 76 #define FE_UPWARD 0x0002 77 #define FE_DOWNWARD 0x0003 78 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 79 FE_UPWARD | FE_TOWARDZERO) 80 81 __BEGIN_DECLS 82 83 /* Default floating-point environment */ 84 extern const fenv_t __fe_dfl_env; 85 #define FE_DFL_ENV (&__fe_dfl_env) 86 87 /* We need to be able to map status flag positions to mask flag positions */ 88 #define _FPUSW_SHIFT 22 89 #define _ENABLE_MASK ((FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \ 90 FE_OVERFLOW | FE_UNDERFLOW) >> _FPUSW_SHIFT) 91 92 #ifndef _SOFT_FLOAT 93 #ifdef __SPE__ 94 #define __mffs(__env) \ 95 __asm __volatile("mfspr %0, 512" : "=r" ((__env)->__bits.__reg)) 96 #define __mtfsf(__env) \ 97 __asm __volatile("mtspr 512,%0;isync" :: "r" ((__env).__bits.__reg)) 98 #else 99 #define __mffs(__env) \ 100 __asm __volatile("mffs %0" : "=f" ((__env)->__d)) 101 #define __mtfsf(__env) \ 102 __asm __volatile("mtfsf 255,%0" :: "f" ((__env).__d)) 103 #endif 104 #else 105 #define __mffs(__env) 106 #define __mtfsf(__env) 107 #endif 108 109 union __fpscr { 110 double __d; 111 struct { 112 #if _BYTE_ORDER == _LITTLE_ENDIAN 113 fenv_t __reg; 114 __uint32_t __junk; 115 #else 116 __uint32_t __junk; 117 fenv_t __reg; 118 #endif 119 } __bits; 120 }; 121 122 __fenv_static inline int 123 feclearexcept(int __excepts) 124 { 125 union __fpscr __r; 126 127 if (__excepts & FE_INVALID) 128 __excepts |= FE_ALL_INVALID; 129 __mffs(&__r); 130 __r.__bits.__reg &= ~__excepts; 131 __mtfsf(__r); 132 return (0); 133 } 134 135 __fenv_static inline int 136 fegetexceptflag(fexcept_t *__flagp, int __excepts) 137 { 138 union __fpscr __r; 139 140 __mffs(&__r); 141 *__flagp = __r.__bits.__reg & __excepts; 142 return (0); 143 } 144 145 __fenv_static inline int 146 fesetexceptflag(const fexcept_t *__flagp, int __excepts) 147 { 148 union __fpscr __r; 149 150 if (__excepts & FE_INVALID) 151 __excepts |= FE_ALL_EXCEPT; 152 __mffs(&__r); 153 __r.__bits.__reg &= ~__excepts; 154 __r.__bits.__reg |= *__flagp & __excepts; 155 __mtfsf(__r); 156 return (0); 157 } 158 159 __fenv_static inline int 160 feraiseexcept(int __excepts) 161 { 162 union __fpscr __r; 163 164 if (__excepts & FE_INVALID) 165 __excepts |= FE_VXSOFT; 166 __mffs(&__r); 167 __r.__bits.__reg |= __excepts; 168 __mtfsf(__r); 169 return (0); 170 } 171 172 __fenv_static inline int 173 fetestexcept(int __excepts) 174 { 175 union __fpscr __r; 176 177 __mffs(&__r); 178 return (__r.__bits.__reg & __excepts); 179 } 180 181 __fenv_static inline int 182 fegetround(void) 183 { 184 union __fpscr __r; 185 186 __mffs(&__r); 187 return (__r.__bits.__reg & _ROUND_MASK); 188 } 189 190 __fenv_static inline int 191 fesetround(int __round) 192 { 193 union __fpscr __r; 194 195 if (__round & ~_ROUND_MASK) 196 return (-1); 197 __mffs(&__r); 198 __r.__bits.__reg &= ~_ROUND_MASK; 199 __r.__bits.__reg |= __round; 200 __mtfsf(__r); 201 return (0); 202 } 203 204 __fenv_static inline int 205 fegetenv(fenv_t *__envp) 206 { 207 union __fpscr __r; 208 209 __mffs(&__r); 210 *__envp = __r.__bits.__reg; 211 return (0); 212 } 213 214 __fenv_static inline int 215 feholdexcept(fenv_t *__envp) 216 { 217 union __fpscr __r; 218 219 __mffs(&__r); 220 *__envp = __r.__bits.__reg; 221 __r.__bits.__reg &= ~(FE_ALL_EXCEPT | _ENABLE_MASK); 222 __mtfsf(__r); 223 return (0); 224 } 225 226 __fenv_static inline int 227 fesetenv(const fenv_t *__envp) 228 { 229 union __fpscr __r; 230 231 __r.__bits.__reg = *__envp; 232 __mtfsf(__r); 233 return (0); 234 } 235 236 __fenv_static inline int 237 feupdateenv(const fenv_t *__envp) 238 { 239 union __fpscr __r; 240 241 __mffs(&__r); 242 __r.__bits.__reg &= FE_ALL_EXCEPT; 243 __r.__bits.__reg |= *__envp; 244 __mtfsf(__r); 245 return (0); 246 } 247 248 #if __BSD_VISIBLE 249 250 /* We currently provide no external definitions of the functions below. */ 251 252 static inline int 253 feenableexcept(int __mask) 254 { 255 union __fpscr __r; 256 fenv_t __oldmask; 257 258 __mffs(&__r); 259 __oldmask = __r.__bits.__reg; 260 __r.__bits.__reg |= (__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT; 261 __mtfsf(__r); 262 return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT); 263 } 264 265 static inline int 266 fedisableexcept(int __mask) 267 { 268 union __fpscr __r; 269 fenv_t __oldmask; 270 271 __mffs(&__r); 272 __oldmask = __r.__bits.__reg; 273 __r.__bits.__reg &= ~((__mask & FE_ALL_EXCEPT) >> _FPUSW_SHIFT); 274 __mtfsf(__r); 275 return ((__oldmask & _ENABLE_MASK) << _FPUSW_SHIFT); 276 } 277 278 static inline int 279 fegetexcept(void) 280 { 281 union __fpscr __r; 282 283 __mffs(&__r); 284 return ((__r.__bits.__reg & _ENABLE_MASK) << _FPUSW_SHIFT); 285 } 286 287 #endif /* __BSD_VISIBLE */ 288 289 __END_DECLS 290 291 #endif /* !_FENV_H_ */ 292