| /* Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Denis Joseph Barrow <djbarrow@de.ibm.com>. |
| |
| 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 bit positions |
| of the appropriate bits in the FPU control word. */ |
| enum |
| { |
| FE_INVALID = |
| #define FE_INVALID 0x80 |
| FE_INVALID, |
| FE_DIVBYZERO = |
| #define FE_DIVBYZERO 0x40 |
| FE_DIVBYZERO, |
| FE_OVERFLOW = |
| #define FE_OVERFLOW 0x20 |
| FE_OVERFLOW, |
| FE_UNDERFLOW = |
| #define FE_UNDERFLOW 0x10 |
| FE_UNDERFLOW, |
| FE_INEXACT = |
| #define FE_INEXACT 0x08 |
| FE_INEXACT |
| }; |
| /* We dont use the y bit of the DXC in the floating point control register |
| as glibc has no FE encoding for fe inexact incremented |
| or fe inexact truncated. |
| We currently use the flag bits in the fpc |
| as these are sticky for feholdenv & feupdatenv as it is defined |
| in the HP Manpages. */ |
| |
| |
| #define FE_ALL_EXCEPT \ |
| (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) |
| |
| enum |
| { |
| FE_TONEAREST = |
| #define FE_TONEAREST 0 |
| FE_TONEAREST, |
| FE_DOWNWARD = |
| #define FE_DOWNWARD 0x3 |
| FE_DOWNWARD, |
| FE_UPWARD = |
| #define FE_UPWARD 0x2 |
| FE_UPWARD, |
| FE_TOWARDZERO = |
| #define FE_TOWARDZERO 0x1 |
| FE_TOWARDZERO |
| }; |
| |
| |
| /* Type representing exception flags. */ |
| typedef unsigned int fexcept_t; /* size of fpc */ |
| |
| |
| /* Type representing floating-point environment. This function corresponds |
| to the layout of the block written by the `fstenv'. */ |
| typedef struct |
| { |
| fexcept_t __fpc; |
| void *__ieee_instruction_pointer; |
| /* failing instruction for ieee exceptions */ |
| } fenv_t; |
| |
| /* If the default argument is used we use this value. */ |
| #define FE_DFL_ENV ((const fenv_t *) -1) |
| |
| #ifdef __USE_GNU |
| /* Floating-point environment where none of the exceptions are masked. */ |
| # define FE_NOMASK_ENV ((const fenv_t *) -2) |
| #endif |
