1 /* Copyright (C) 1999-2025 Free Software Foundation, Inc. 2 3 The GNU C Library is free software; you can redistribute it and/or 4 modify it under the terms of the GNU Lesser General Public 5 License as published by the Free Software Foundation; either 6 version 2.1 of the License, or (at your option) any later version. 7 8 The GNU C Library is distributed in the hope that it will be useful, 9 but WITHOUT ANY WARRANTY; without even the implied warranty of 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 Lesser General Public License for more details. 12 13 You should have received a copy of the GNU Lesser General Public 14 License along with the GNU C Library; if not, see 15 <https://www.gnu.org/licenses/>. */ 16 17 #ifndef _FENV_H 18 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." 19 #endif 20 21 22 /* Define bits representing the exception. We use the bit positions 23 of the appropriate bits in the FPU control word. */ 24 enum 25 { 26 FE_INEXACT = 27 #define FE_INEXACT 0x04 28 FE_INEXACT, 29 FE_UNDERFLOW = 30 #define FE_UNDERFLOW 0x08 31 FE_UNDERFLOW, 32 FE_OVERFLOW = 33 #define FE_OVERFLOW 0x10 34 FE_OVERFLOW, 35 FE_DIVBYZERO = 36 #define FE_DIVBYZERO 0x20 37 FE_DIVBYZERO, 38 FE_INVALID = 39 #define FE_INVALID 0x40 40 FE_INVALID, 41 }; 42 43 #define FE_ALL_EXCEPT \ 44 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) 45 46 /* The SH FPU supports two of the four defined rounding modes: round to nearest 47 and round to zero. We use again the bit positions in the FPU control word 48 as the values for the appropriate macros. */ 49 enum 50 { 51 __FE_UNDEFINED = -1, 52 53 FE_TONEAREST = 54 #define FE_TONEAREST 0x0 55 FE_TONEAREST, 56 FE_TOWARDZERO = 57 #define FE_TOWARDZERO 0x1 58 FE_TOWARDZERO, 59 }; 60 61 62 /* Type representing exception flags. */ 63 typedef unsigned short int fexcept_t; 64 65 66 /* Type representing floating-point environment. This function corresponds 67 to the layout of the block written by the `fstenv'. */ 68 typedef struct 69 { 70 unsigned int __fpscr; 71 } 72 fenv_t; 73 74 /* If the default argument is used we use this value. */ 75 #define FE_DFL_ENV ((const fenv_t *) -1) 76 77 /* Type representing floating-point control modes. */ 78 typedef unsigned int femode_t; 79 80 /* Default floating-point control modes. */ 81 # define FE_DFL_MODE ((const femode_t *) -1L) 82