| /* Copyright (C) 1997,1998,1999,2000,2001,2004 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #ifndef _FENV_H |
| # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." |
| #endif |
| |
| #include <bits/wordsize.h> |
| |
| |
| /* Define bits representing the exception. We use the bit positions |
| of the appropriate bits in the FPU control word. */ |
| enum |
| { |
| FE_INVALID = 0x01, |
| #define FE_INVALID FE_INVALID |
| __FE_DENORM = 0x02, |
| FE_DIVBYZERO = 0x04, |
| #define FE_DIVBYZERO FE_DIVBYZERO |
| FE_OVERFLOW = 0x08, |
| #define FE_OVERFLOW FE_OVERFLOW |
| FE_UNDERFLOW = 0x10, |
| #define FE_UNDERFLOW FE_UNDERFLOW |
| FE_INEXACT = 0x20 |
| #define FE_INEXACT FE_INEXACT |
| }; |
| |
| #define FE_ALL_EXCEPT \ |
| (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) |
| |
| /* The ix87 FPU supports all of the four defined rounding modes. We |
| use again the bit positions in the FPU control word as the values |
| for the appropriate macros. */ |
| enum |
| { |
| FE_TONEAREST = 0, |
| #define FE_TONEAREST FE_TONEAREST |
| FE_DOWNWARD = 0x400, |
| #define FE_DOWNWARD FE_DOWNWARD |
| FE_UPWARD = 0x800, |
| #define FE_UPWARD FE_UPWARD |
| FE_TOWARDZERO = 0xc00 |
| #define FE_TOWARDZERO FE_TOWARDZERO |
| }; |
| |
| |
| /* Type representing exception flags. */ |
| typedef unsigned short int fexcept_t; |
| |
| |
| /* Type representing floating-point environment. This structure |
| corresponds to the layout of the block written by the `fstenv' |
| instruction and has additional fields for the contents of the MXCSR |
| register as written by the `stmxcsr' instruction. */ |
| typedef struct |
| { |
| unsigned short int __control_word; |
| unsigned short int __unused1; |
| unsigned short int __status_word; |
| unsigned short int __unused2; |
| unsigned short int __tags; |
| unsigned short int __unused3; |
| unsigned int __eip; |
| unsigned short int __cs_selector; |
| unsigned int __opcode:11; |
| unsigned int __unused4:5; |
| unsigned int __data_offset; |
| unsigned short int __data_selector; |
| unsigned short int __unused5; |
| #if __WORDSIZE == 64 |
| unsigned int __mxcsr; |
| #endif |
| } |
| 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 exception is masked. */ |
| # define FE_NOMASK_ENV ((__const fenv_t *) -2) |
| #endif |