fenv.h (2471B) - Raw
1 /* Copyright (C) 2004-2025 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 /* Define bits representing exceptions in the FPU status word. */ 23 enum 24 { 25 FE_INVALID = 26 #define FE_INVALID 1 27 FE_INVALID, 28 FE_DIVBYZERO = 29 #define FE_DIVBYZERO 2 30 FE_DIVBYZERO, 31 FE_OVERFLOW = 32 #define FE_OVERFLOW 4 33 FE_OVERFLOW, 34 FE_UNDERFLOW = 35 #define FE_UNDERFLOW 8 36 FE_UNDERFLOW, 37 FE_INEXACT = 38 #define FE_INEXACT 16 39 FE_INEXACT, 40 }; 41 42 /* Amount to shift by to convert an exception to a mask bit. */ 43 #define FE_EXCEPT_SHIFT 8 44 45 /* All supported exceptions. */ 46 #define FE_ALL_EXCEPT \ 47 (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT) 48 49 /* VFP supports all of the four defined rounding modes. */ 50 enum 51 { 52 FE_TONEAREST = 53 #define FE_TONEAREST 0 54 FE_TONEAREST, 55 FE_UPWARD = 56 #define FE_UPWARD 0x400000 57 FE_UPWARD, 58 FE_DOWNWARD = 59 #define FE_DOWNWARD 0x800000 60 FE_DOWNWARD, 61 FE_TOWARDZERO = 62 #define FE_TOWARDZERO 0xc00000 63 FE_TOWARDZERO 64 }; 65 66 /* Type representing exception flags. */ 67 typedef unsigned int fexcept_t; 68 69 /* Type representing floating-point environment. */ 70 typedef struct 71 { 72 unsigned int __cw; 73 } 74 fenv_t; 75 76 /* If the default argument is used we use this value. */ 77 #define FE_DFL_ENV ((const fenv_t *) -1l) 78 79 #ifdef __USE_GNU 80 /* Floating-point environment where none of the exceptions are masked. */ 81 # define FE_NOMASK_ENV ((const fenv_t *) -2) 82 #endif 83 84 #if __GLIBC_USE (IEC_60559_BFP_EXT_C23) 85 /* Type representing floating-point control modes. */ 86 typedef unsigned int femode_t; 87 88 /* Default floating-point control modes. */ 89 # define FE_DFL_MODE ((const femode_t *) -1L) 90 #endif