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: src/lib/msun/i387/fenv.h,v 1.4 2005/03/17 22:21:46 das Exp $ 27 */ 28 29 #ifndef _FENV_H_ 30 #define _FENV_H_ 31 32 #include <sys/types.h> 33 34 __BEGIN_DECLS 35 36 /* 37 * To preserve binary compatibility with FreeBSD 5.3, we pack the 38 * mxcsr into some reserved fields, rather than changing sizeof(fenv_t). 39 */ 40 typedef struct { 41 __uint16_t __control; 42 __uint16_t __mxcsr_hi; 43 __uint16_t __status; 44 __uint16_t __mxcsr_lo; 45 __uint32_t __tag; 46 char __other[16]; 47 } fenv_t; 48 49 typedef __uint16_t fexcept_t; 50 51 /* Exception flags */ 52 #define FE_INVALID 0x01 53 #define FE_DENORMAL 0x02 54 #define FE_DIVBYZERO 0x04 55 #define FE_OVERFLOW 0x08 56 #define FE_UNDERFLOW 0x10 57 #define FE_INEXACT 0x20 58 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \ 59 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 60 61 /* Rounding modes */ 62 #define FE_TONEAREST 0x0000 63 #define FE_DOWNWARD 0x0400 64 #define FE_UPWARD 0x0800 65 #define FE_TOWARDZERO 0x0c00 66 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 67 FE_UPWARD | FE_TOWARDZERO) 68 69 /* Default floating-point environment */ 70 extern const fenv_t __fe_dfl_env; 71 #define FE_DFL_ENV (&__fe_dfl_env) 72 73 /* C99 floating-point exception functions */ 74 int feclearexcept(int excepts); 75 int fegetexceptflag(fexcept_t *flagp, int excepts); 76 int fesetexceptflag(const fexcept_t *flagp, int excepts); 77 /* feraiseexcept does not set the inexact flag on overflow/underflow */ 78 int feraiseexcept(int excepts); 79 int fetestexcept(int excepts); 80 81 /* C99 rounding control functions */ 82 int fegetround(void); 83 int fesetround(int round); 84 85 /* C99 floating-point environment functions */ 86 int fegetenv(fenv_t *__envp); 87 int feholdexcept(fenv_t *__envp); 88 int fesetenv(const fenv_t *envp); 89 int feupdateenv(const fenv_t *__envp); 90 91 #if __BSD_VISIBLE 92 /* Additional support functions to set/query floating point traps */ 93 int feenableexcept(int __mask); 94 int fedisableexcept(int __mask); 95 int fegetexcept(void); 96 97 #endif /* __BSD_VISIBLE */ 98 99 __END_DECLS 100 101 #endif /* !_FENV_H_ */ 102