/* $OpenBSD: fenv.h,v 1.3 2019/03/12 22:14:50 patrick Exp $ */ /* * Copyright (c) 2011 Martynas Venckus * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef _MACHINE_FENV_H_ #define _MACHINE_FENV_H_ /* * Each symbol representing a floating point exception expands to an integer * constant expression with values, such that bitwise-inclusive ORs of _all * combinations_ of the constants result in distinct values. * * We use such values that allow direct bitwise operations on FPU registers. */ #define FE_INVALID 0x01 #define FE_DIVBYZERO 0x02 #define FE_OVERFLOW 0x04 #define FE_UNDERFLOW 0x08 #define FE_INEXACT 0x10 #define FE_DENORMAL 0x80 /* * The following symbol is simply the bitwise-inclusive OR of all floating-point * exception constants defined above. */ #define FE_ALL_EXCEPT (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | \ FE_UNDERFLOW | FE_INEXACT | FE_DENORMAL) /* * Each symbol representing the rounding direction, expands to an integer * constant expression whose value is distinct non-negative value. * * We use such values that allow direct bitwise operations on FPU registers. */ #define FE_TONEAREST 0x0 #define FE_UPWARD 0x1 #define FE_DOWNWARD 0x2 #define FE_TOWARDZERO 0x3 /* * The following symbol is simply the bitwise-inclusive OR of all floating-point * rounding direction constants defined above. */ #define _ROUND_MASK (FE_TONEAREST | FE_UPWARD | FE_DOWNWARD | \ FE_TOWARDZERO) #define _ROUND_SHIFT 22 /* * fenv_t represents the entire floating-point environment. */ typedef unsigned long long fenv_t; /* * The following constant represents the default floating-point environment * (that is, the one installed at program startup) and has type pointer to * const-qualified fenv_t. * * It can be used as an argument to the functions within the header * that manage the floating-point environment, namely fesetenv() and * feupdateenv(). */ __BEGIN_DECLS extern fenv_t __fe_dfl_env; __END_DECLS #define FE_DFL_ENV ((const fenv_t *)&__fe_dfl_env) /* * fexcept_t represents the floating-point status flags collectively, including * any status the implementation associates with the flags. * * A floating-point status flag is a system variable whose value is set (but * never cleared) when a floating-point exception is raised, which occurs as a * side effect of exceptional floating-point arithmetic to provide auxiliary * information. * * A floating-point control mode is a system variable whose value may be set by * the user to affect the subsequent behavior of floating-point arithmetic. */ typedef unsigned long long fexcept_t; #endif /* !_MACHINE_FENV_H_ */