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/cdefs.h> 33#include <sys/_types.h> 34 35/* 36 * To preserve binary compatibility with FreeBSD 5.3, we pack the 37 * mxcsr into some reserved fields, rather than changing sizeof(fenv_t). 38 */ 39typedef struct { 40 __uint16_t __control; 41 __uint16_t __mxcsr_hi; 42 __uint16_t __status; 43 __uint16_t __mxcsr_lo; 44 __uint32_t __tag; 45 char __other[16]; 46} fenv_t; 47 48typedef __uint16_t fexcept_t; 49 50/* Exception flags */ 51#define FE_INVALID 0x01 52#define FE_DENORMAL 0x02 53#define FE_DIVBYZERO 0x04 54#define FE_OVERFLOW 0x08 55#define FE_UNDERFLOW 0x10 56#define FE_INEXACT 0x20 57#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \ 58 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 59 60/* Rounding modes */ 61#define FE_TONEAREST 0x0000 62#define FE_DOWNWARD 0x0400 63#define FE_UPWARD 0x0800 64#define FE_TOWARDZERO 0x0c00 65#define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 66 FE_UPWARD | FE_TOWARDZERO) 67 68__BEGIN_DECLS 69 70/* Default floating-point environment */ 71extern const fenv_t __fe_dfl_env; 72#define FE_DFL_ENV (&__fe_dfl_env) 73 74/* C99 floating-point exception functions */ 75int feclearexcept(int excepts); 76int fegetexceptflag(fexcept_t *flagp, int excepts); 77int fesetexceptflag(const fexcept_t *flagp, int excepts); 78/* feraiseexcept does not set the inexact flag on overflow/underflow */ 79int feraiseexcept(int excepts); 80int fetestexcept(int excepts); 81 82/* C99 rounding control functions */ 83int fegetround(void); 84int fesetround(int round); 85 86/* C99 floating-point environment functions */ 87int fegetenv(fenv_t *__envp); 88int feholdexcept(fenv_t *__envp); 89int fesetenv(const fenv_t *envp); 90int feupdateenv(const fenv_t *__envp); 91 92#if __BSD_VISIBLE 93/* Additional support functions to set/query floating point traps */ 94int feenableexcept(int __mask); 95int fedisableexcept(int __mask); 96int fegetexcept(void); 97 98#endif /* __BSD_VISIBLE */ 99 100__END_DECLS 101 102#endif /* !_FENV_H_ */ 103