1 /* Copyright (C) 1998, 1999, 2000 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, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19 #ifndef _FENV_H 20 # error "Never use <bits/fenv.h> directly; include <fenv.h> instead." 21 #endif 22 23 24 /* Define bits representing the exception. We use the bit positions 25 of the appropriate bits in the FPU control word. */ 26 enum 27 { 28 FE_INEXACT = 0x04, 29 #define FE_INEXACT FE_INEXACT 30 FE_UNDERFLOW = 0x08, 31 #define FE_UNDERFLOW FE_UNDERFLOW 32 FE_OVERFLOW = 0x10, 33 #define FE_OVERFLOW FE_OVERFLOW 34 FE_DIVBYZERO = 0x20, 35 #define FE_DIVBYZERO FE_DIVBYZERO 36 FE_INVALID = 0x40, 37 #define FE_INVALID FE_INVALID 38 }; 39 40 #define FE_ALL_EXCEPT \ 41 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) 42 43 /* The MIPS FPU supports all of the four defined rounding modes. We 44 use again the bit positions in the FPU control word as the values 45 for the appropriate macros. */ 46 enum 47 { 48 FE_TONEAREST = 0x0, 49 #define FE_TONEAREST FE_TONEAREST 50 FE_TOWARDZERO = 0x1, 51 #define FE_TOWARDZERO FE_TOWARDZERO 52 FE_UPWARD = 0x2, 53 #define FE_UPWARD FE_UPWARD 54 FE_DOWNWARD = 0x3 55 #define FE_DOWNWARD FE_DOWNWARD 56 }; 57 58 59 /* Type representing exception flags. */ 60 typedef unsigned short int fexcept_t; 61 62 63 /* Type representing floating-point environment. This function corresponds 64 to the layout of the block written by the `fstenv'. */ 65 typedef struct 66 { 67 unsigned int __fp_control_register; 68 } 69 fenv_t; 70 71 /* If the default argument is used we use this value. */ 72 #define FE_DFL_ENV ((__const fenv_t *) -1) 73 74 #ifdef __USE_GNU 75 /* Floating-point environment where none of the exception is masked. */ 76 # define FE_NOMASK_ENV ((__const fenv_t *) -2) 77 #endif 78