| /* Copyright (C) 2000-2014 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 = |
| #define FE_INVALID (1<<4) /* V */ |
| FE_INVALID, |
| FE_DIVBYZERO = |
| #define FE_DIVBYZERO (1<<3) /* Z */ |
| FE_DIVBYZERO, |
| FE_OVERFLOW = |
| #define FE_OVERFLOW (1<<2) /* O */ |
| FE_OVERFLOW, |
| FE_UNDERFLOW = |
| #define FE_UNDERFLOW (1<<1) /* U */ |
| FE_UNDERFLOW, |
| FE_INEXACT = |
| #define FE_INEXACT (1<<0) /* I */ |
| 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 = |
| #define FE_TONEAREST (0 << 9) |
| FE_TONEAREST, |
| FE_TOWARDZERO = |
| #define FE_TOWARDZERO (1 << 9) |
| FE_TOWARDZERO, |
| FE_UPWARD = |
| #define FE_UPWARD (2 << 9) |
| FE_UPWARD, |
| FE_DOWNWARD = |
| #define FE_DOWNWARD (3 << 9) |
| 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. The exception registers are never saved/stored by |
| userspace. This structure is also not correctly aligned ever, in |
| an ABI error we left out __aligned(8) and subsequently all of our |
| fenv functions must accept unaligned input, align the input, and |
| then use assembly to store fr0. This is a performance hit, but |
| means the ABI is stable. */ |
| 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 ((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 |