fenv.h revision 1.2
1 /* $NetBSD: fenv.h,v 1.2 2017/01/13 19:10:14 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2004-2005 David Schultz <das (at) 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: head/lib/msun/mips/fenv.h 226218 2011-10-10 15:43:09Z das $ 29 */ 30 31 #ifndef _MIPS_FENV_H_ 32 #define _MIPS_FENV_H_ 33 34 #include <sys/stdint.h> 35 36 #ifndef __fenv_static 37 #define __fenv_static static 38 #endif 39 40 typedef uint32_t fpu_control_t __attribute__((__mode__(__SI__))); 41 typedef fpu_control_t fenv_t; 42 typedef fpu_control_t fexcept_t; 43 44 /* Exception flags */ 45 #define FE_INEXACT 0x0004 46 #define FE_UNDERFLOW 0x0008 47 #define FE_OVERFLOW 0x0010 48 #define FE_DIVBYZERO 0x0020 49 #define FE_INVALID 0x0040 50 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 51 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 52 53 /* Rounding modes */ 54 #define FE_TONEAREST 0x0000 55 #define FE_TOWARDZERO 0x0001 56 #define FE_UPWARD 0x0002 57 #define FE_DOWNWARD 0x0003 58 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 59 FE_UPWARD | FE_TOWARDZERO) 60 __BEGIN_DECLS 61 62 /* Default floating-point environment */ 63 extern const fenv_t __fe_dfl_env; 64 #define FE_DFL_ENV (&__fe_dfl_env) 65 66 /* We need to be able to map status flag positions to mask flag positions */ 67 #define _ENABLE_MASK (FE_ALL_EXCEPT << _ENABLE_SHIFT) 68 #define _ENABLE_SHIFT 5 69 70 71 #define __rfs(__fpsr) __asm __volatile("cfc1 %0,$31" : "=r" ((*__fpsr))) 72 #define __wfs(__fpsr) __asm __volatile("ctc1 %0,$31" : : "r" (__fpsr)) 73 74 __fenv_static inline int 75 feclearexcept(int __excepts) 76 { 77 fexcept_t __fpsr; 78 79 __excepts &= FE_ALL_EXCEPT; 80 __rfs(&__fpsr); 81 __fpsr &= ~(__excepts | (__excepts << _ENABLE_SHIFT)); 82 __wfs(__fpsr); 83 return 0; 84 } 85 86 __fenv_static inline int 87 fegetexceptflag(fexcept_t *__flagp, int __excepts) 88 { 89 fexcept_t __fpsr; 90 91 __rfs(&__fpsr); 92 *__flagp = __fpsr & __excepts; 93 return (0); 94 } 95 96 __fenv_static inline int 97 fesetexceptflag(const fexcept_t *__flagp, int __excepts) 98 { 99 fexcept_t __fpsr; 100 101 __rfs(&__fpsr); 102 __fpsr &= ~__excepts; 103 __fpsr |= *__flagp & __excepts; 104 __wfs(__fpsr); 105 return (0); 106 } 107 108 __fenv_static inline int 109 feraiseexcept(int __excepts) 110 { 111 fexcept_t __ex = __excepts; 112 113 fesetexceptflag(&__ex, __excepts); /* XXX */ 114 return (0); 115 } 116 117 __fenv_static inline int 118 fetestexcept(int __excepts) 119 { 120 fexcept_t __fpsr; 121 122 __rfs(&__fpsr); 123 return (__fpsr & __excepts); 124 } 125 126 __fenv_static inline int 127 fegetround(void) 128 { 129 fexcept_t __fpsr; 130 131 __rfs(&__fpsr); 132 return __fpsr & _ROUND_MASK; 133 } 134 135 __fenv_static inline int 136 fesetround(int __round) 137 { 138 fexcept_t __fpsr; 139 140 if (__round & ~_ROUND_MASK) 141 return 1; 142 __rfs(&__fpsr); 143 __fpsr &= ~_ROUND_MASK; 144 __fpsr |= __round; 145 __wfs(&__fpsr); 146 147 return 0; 148 } 149 150 __fenv_static inline int 151 fegetenv(fenv_t *__envp) 152 { 153 154 __rfs(__envp); 155 return (0); 156 } 157 158 __fenv_static inline int 159 feholdexcept(fenv_t *__envp) 160 { 161 fenv_t __env; 162 163 __rfs(&__env); 164 *__envp = __env; 165 __env &= ~(FE_ALL_EXCEPT | _ENABLE_MASK); 166 __wfs(__env); 167 return (0); 168 } 169 170 __fenv_static inline int 171 fesetenv(const fenv_t *__envp) 172 { 173 174 __wfs(*__envp); 175 return (0); 176 } 177 178 __fenv_static inline int 179 feupdateenv(const fenv_t *__envp) 180 { 181 fexcept_t __fpsr; 182 183 __rfs(&__fpsr); 184 __wfs(*__envp); 185 feraiseexcept(__fpsr & FE_ALL_EXCEPT); 186 return (0); 187 } 188 189 #if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE) 190 191 /* We currently provide no external definitions of the functions below. */ 192 193 static inline int 194 feenableexcept(int __excepts) 195 { 196 fenv_t __old_fpsr, __new_fpsr; 197 198 __rfs(&__new_fpsr); 199 __old_fpsr = (__new_fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT; 200 __excepts &= FE_ALL_EXCEPT; 201 __new_fpsr |= __excepts << _ENABLE_SHIFT; 202 __wfs(__new_fpsr); 203 return __old_fpsr; 204 } 205 206 static inline int 207 fedisableexcept(int __excepts) 208 { 209 fenv_t __old_fpsr, __new_fpsr; 210 211 __rfs(&__new_fpsr); 212 __old_fpsr = (__new_fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT; 213 __excepts &= FE_ALL_EXCEPT; 214 __new_fpsr &= ~(__excepts << _ENABLE_SHIFT); 215 __wfs(__new_fpsr); 216 return __old_fpsr; 217 } 218 219 static inline int 220 fegetexcept(void) 221 { 222 fenv_t __fpsr; 223 224 __rfs(&__fpsr); 225 return ((__fpsr & _ENABLE_MASK) >> _ENABLE_SHIFT); 226 } 227 228 #endif /* _NETBSD_SOURCE || _GNU_SOURCE */ 229 230 __END_DECLS 231 232 #endif /* !_FENV_H_ */ 233
Indexes created Mon Sep 22 13:09:51 GMT 2025