/* Copyright (C) 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by David Huggins-Daines <dhd@debian.org> The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _FENV_H # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." #endif /* Define bits representing the exception. We use the values of the appropriate enable bits in the FPU status word (which, coincidentally, are the same as the flag bits, but shifted right by 27 bits). */ enum { FE_INVALID = 1<<4, /* V */ #define FE_INVALID FE_INVALID FE_DIVBYZERO = 1<<3, /* Z */ #define FE_DIVBYZERO FE_DIVBYZERO FE_OVERFLOW = 1<<2, /* O */ #define FE_OVERFLOW FE_OVERFLOW FE_UNDERFLOW = 1<<1, /* U */ #define FE_UNDERFLOW FE_UNDERFLOW FE_INEXACT = 1<<0, /* I */ #define FE_INEXACT FE_INEXACT }; #define FE_ALL_EXCEPT \ (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) /* The PA-RISC FPU supports all of the four defined rounding modes. We use the values of the RM field in the floating point status register for the appropriate macros. */ enum { FE_TONEAREST = 0 << 9, #define FE_TONEAREST FE_TONEAREST FE_TOWARDZERO = 1 << 9, #define FE_TOWARDZERO FE_TOWARDZERO FE_UPWARD = 2 << 9, #define FE_UPWARD FE_UPWARD FE_DOWNWARD = 3 << 9, #define FE_DOWNWARD FE_DOWNWARD }; /* Type representing exception flags. */ typedef unsigned int fexcept_t; /* Type representing floating-point environment. This structure corresponds to the layout of the status and exception words in the register file. */ typedef struct { unsigned int __status_word; unsigned int __exception[7]; } fenv_t; /* If the default argument is used we use this value. */ #define FE_DFL_ENV ((fenv_t *) -1) #ifdef __USE_GNU /* Floating-point environment where none of the exceptions are masked. */ # define FE_NOMASK_ENV ((fenv_t *) -2) #endif