1 /* Copyright (C) 1999-2022 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 <https://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 = 29 #define FE_INEXACT (1 << 5) 30 FE_INEXACT, 31 32 FE_UNDERFLOW = 33 #define FE_UNDERFLOW (1 << 4) 34 FE_UNDERFLOW, 35 36 FE_OVERFLOW = 37 #define FE_OVERFLOW (1 << 3) 38 FE_OVERFLOW, 39 40 FE_DIVBYZERO = 41 #define FE_DIVBYZERO (1 << 2) 42 FE_DIVBYZERO, 43 44 FE_UNNORMAL = 45 #define FE_UNNORMAL (1 << 1) 46 FE_UNNORMAL, 47 48 FE_INVALID = 49 #define FE_INVALID (1 << 0) 50 FE_INVALID, 51 52 FE_ALL_EXCEPT = 53 #define FE_ALL_EXCEPT (FE_INEXACT | FE_UNDERFLOW | FE_OVERFLOW | FE_DIVBYZERO | FE_UNNORMAL | FE_INVALID) 54 FE_ALL_EXCEPT 55 }; 56 57 58 enum 59 { 60 FE_TOWARDZERO = 61 #define FE_TOWARDZERO 3 62 FE_TOWARDZERO, 63 64 FE_UPWARD = 65 #define FE_UPWARD 2 66 FE_UPWARD, 67 68 FE_DOWNWARD = 69 #define FE_DOWNWARD 1 70 FE_DOWNWARD, 71 72 FE_TONEAREST = 73 #define FE_TONEAREST 0 74 FE_TONEAREST, 75 }; 76 77 78 /* Type representing exception flags. */ 79 typedef unsigned long int fexcept_t; 80 81 /* Type representing floating-point environment. */ 82 typedef unsigned long int fenv_t; 83 84 /* If the default argument is used we use this value. */ 85 #define FE_DFL_ENV ((const fenv_t *) 0xc009804c0270033fUL) 86 87 #ifdef __USE_GNU 88 /* Floating-point environment where only FE_UNNORMAL is masked since this 89 exception is not generally supported by glibc. */ 90 # define FE_NOMASK_ENV ((const fenv_t *) 0xc009804c02700302UL) 91 92 /* Floating-point environment with (processor-dependent) non-IEEE 93 floating point. In this case, turning on flush-to-zero mode for 94 s0, s2, and s3. */ 95 # define FE_NONIEEE_ENV ((const fenv_t *) 0xc009a04d0270037fUL) 96 #endif 97 98 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X) 99 /* Type representing floating-point control modes. */ 100 typedef unsigned long int femode_t; 101 102 /* Default floating-point control modes. */ 103 # define FE_DFL_MODE ((const femode_t *) 0xc009804c0270033fUL) 104 #endif 105