1 /* Copyright (C) 2013 Imagination Technologies Ltd. 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; see the file COPYING.LIB. If 16 not, see <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 24 of the appropriate bits in TXDEFR. */ 25 enum 26 { 27 FE_INEXACT = 0x1, 28 #define FE_INEXACT FE_INEXACT 29 FE_UNDERFLOW = 0x2, 30 #define FE_UNDERFLOW FE_UNDERFLOW 31 FE_OVERFLOW = 0x4, 32 #define FE_OVERFLOW FE_OVERFLOW 33 FE_DIVBYZERO = 0x8, 34 #define FE_DIVBYZERO FE_DIVBYZERO 35 FE_INVALID = 0x10, 36 #define FE_INVALID FE_INVALID 37 }; 38 39 #define FE_ALL_EXCEPT \ 40 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) 41 42 /* The Meta FPU supports all of the four defined rounding modes. We 43 use the values of the rounding mode bits in TXMODE as the values 44 for the appropriate macros. */ 45 enum 46 { 47 FE_TONEAREST = 0x0, 48 #define FE_TONEAREST FE_TONEAREST 49 FE_TOWARDZERO = 0x1, 50 #define FE_TOWARDZERO FE_TOWARDZERO 51 FE_UPWARD = 0x2, 52 #define FE_UPWARD FE_UPWARD 53 FE_DOWNWARD = 0x3 54 #define FE_DOWNWARD FE_DOWNWARD 55 }; 56 57 58 /* Type representing exception flags. */ 59 typedef unsigned int fexcept_t; 60 61 62 /* Type representing floating-point environment. */ 63 typedef struct 64 { 65 unsigned int txdefr; 66 unsigned int txmode; 67 } 68 fenv_t; 69 70 /* If the default argument is used we use this value. */ 71 #define FE_DFL_ENV ((__const fenv_t *) -1) 72 73 #ifdef __USE_GNU 74 /* Floating-point environment where none of the exception is masked. */ 75 # define FE_NOMASK_ENV ((__const fenv_t *) -2) 76 #endif 77