1 /* Copyright (C) 1999-2021 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 24 of the appropriate bits in the FPU control word. */ 25 enum 26 { 27 FE_INEXACT = 28 #define FE_INEXACT 0x04 29 FE_INEXACT, 30 FE_UNDERFLOW = 31 #define FE_UNDERFLOW 0x08 32 FE_UNDERFLOW, 33 FE_OVERFLOW = 34 #define FE_OVERFLOW 0x10 35 FE_OVERFLOW, 36 FE_DIVBYZERO = 37 #define FE_DIVBYZERO 0x20 38 FE_DIVBYZERO, 39 FE_INVALID = 40 #define FE_INVALID 0x40 41 FE_INVALID, 42 }; 43 44 #define FE_ALL_EXCEPT \ 45 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) 46 47 /* The SH FPU supports two of the four defined rounding modes: round to nearest 48 and round to zero. We use again the bit positions in the FPU control word 49 as the values for the appropriate macros. */ 50 enum 51 { 52 __FE_UNDEFINED = -1, 53 54 FE_TONEAREST = 55 #define FE_TONEAREST 0x0 56 FE_TONEAREST, 57 FE_TOWARDZERO = 58 #define FE_TOWARDZERO 0x1 59 FE_TOWARDZERO, 60 }; 61 62 63 /* Type representing exception flags. */ 64 typedef unsigned short int fexcept_t; 65 66 67 /* Type representing floating-point environment. This function corresponds 68 to the layout of the block written by the `fstenv'. */ 69 typedef struct 70 { 71 unsigned int __fpscr; 72 } 73 fenv_t; 74 75 /* If the default argument is used we use this value. */ 76 #define FE_DFL_ENV ((const fenv_t *) -1) 77 78 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X) 79 /* Type representing floating-point control modes. */ 80 typedef unsigned int femode_t; 81 82 /* Default floating-point control modes. */ 83 # define FE_DFL_MODE ((const femode_t *) -1L) 84 #endif 85