1 /* Copyright (C) 1999, 2000 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <http://www.gnu.org/licenses/>. */ 17 18 #ifndef _FENV_H 19 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." 20 #endif 21 22 23 /* Define bits representing the exception. We use the bit positions of 24 the appropriate bits in the FPSR... (Tahoe EAS 2.4 5-4)*/ 25 26 enum 27 { 28 FE_INEXACT = 1UL << 5, 29 #define FE_INEXACT FE_INEXACT 30 31 FE_UNDERFLOW = 1UL << 4, 32 #define FE_UNDERFLOW FE_UNDERFLOW 33 34 FE_OVERFLOW = 1UL << 3, 35 #define FE_OVERFLOW FE_OVERFLOW 36 37 FE_DIVBYZERO = 1UL << 2, 38 #define FE_DIVBYZERO FE_DIVBYZERO 39 40 FE_UNNORMAL = 1UL << 1, 41 #define FE_UNNORMAL FE_UNNORMAL 42 43 FE_INVALID = 1UL << 0, 44 #define FE_INVALID FE_INVALID 45 46 FE_ALL_EXCEPT = 47 (FE_INEXACT | FE_UNDERFLOW | FE_OVERFLOW | FE_DIVBYZERO | FE_UNNORMAL | FE_INVALID) 48 #define FE_ALL_EXCEPT FE_ALL_EXCEPT 49 }; 50 51 52 enum 53 { 54 FE_TOWARDZERO = 3, 55 #define FE_TOWARDZERO FE_TOWARDZERO 56 57 FE_UPWARD = 2, 58 #define FE_UPWARD FE_UPWARD 59 60 FE_DOWNWARD = 1, 61 #define FE_DOWNWARD FE_DOWNWARD 62 63 FE_TONEAREST = 0, 64 #define FE_TONEAREST FE_TONEAREST 65 }; 66 67 68 /* Type representing exception flags. */ 69 typedef unsigned long int fexcept_t; 70 71 /* Type representing floating-point environment. */ 72 typedef unsigned long int fenv_t; 73 74 /* If the default argument is used we use this value. */ 75 #define FE_DFL_ENV ((const fenv_t *) 0xc009804c0270033fUL) 76 77 #ifdef __USE_GNU 78 /* Floating-point environment where only FE_UNNORMAL is masked since this 79 exception is not generally supported by glibc. */ 80 # define FE_NOMASK_ENV ((const fenv_t *) 0xc009804c02700302UL) 81 82 /* Floating-point environment with (processor-dependent) non-IEEE 83 floating point. In this case, turning on flush-to-zero mode for 84 s0, s2, and s3. */ 85 # define FE_NONIEEE_ENV ((const fenv_t *) 0xc009a04d0270037fUL) 86 #endif 87