1 /* Copyright (C) 2000-2022 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 the exception. We use the bit positions 23 of the appropriate bits in the FPU control word. */ 24 enum 25 { 26 FE_INVALID = 27 #define FE_INVALID 0x80 28 FE_INVALID, 29 FE_DIVBYZERO = 30 #define FE_DIVBYZERO 0x40 31 FE_DIVBYZERO, 32 FE_OVERFLOW = 33 #define FE_OVERFLOW 0x20 34 FE_OVERFLOW, 35 FE_UNDERFLOW = 36 #define FE_UNDERFLOW 0x10 37 FE_UNDERFLOW, 38 FE_INEXACT = 39 #define FE_INEXACT 0x08 40 FE_INEXACT 41 }; 42 /* We dont use the y bit of the DXC in the floating point control register 43 as glibc has no FE encoding for fe inexact incremented 44 or fe inexact truncated. 45 We currently use the flag bits in the fpc 46 as these are sticky for feholdenv & feupdatenv as it is defined 47 in the HP Manpages. */ 48 49 50 #define FE_ALL_EXCEPT \ 51 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID) 52 53 enum 54 { 55 FE_TONEAREST = 56 #define FE_TONEAREST 0 57 FE_TONEAREST, 58 FE_DOWNWARD = 59 #define FE_DOWNWARD 0x3 60 FE_DOWNWARD, 61 FE_UPWARD = 62 #define FE_UPWARD 0x2 63 FE_UPWARD, 64 FE_TOWARDZERO = 65 #define FE_TOWARDZERO 0x1 66 FE_TOWARDZERO 67 }; 68 69 70 /* Type representing exception flags. */ 71 typedef unsigned int fexcept_t; /* size of fpc */ 72 73 74 /* Type representing floating-point environment. This function corresponds 75 to the layout of the block used by fegetenv and fesetenv. */ 76 typedef struct 77 { 78 fexcept_t __fpc; 79 void *__unused; 80 /* The field __unused (formerly __ieee_instruction_pointer) is a relict from 81 commit "Remove PTRACE_PEEKUSER" (87b9b50f0d4b92248905e95a06a13c513dc45e59) 82 and isn't used anymore. */ 83 } fenv_t; 84 85 /* If the default argument is used we use this value. */ 86 #define FE_DFL_ENV ((const fenv_t *) -1) 87 88 #ifdef __USE_GNU 89 /* Floating-point environment where none of the exceptions are masked. */ 90 # define FE_NOMASK_ENV ((const fenv_t *) -2) 91 #endif 92 93 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X) 94 /* Type representing floating-point control modes. */ 95 typedef unsigned int femode_t; 96 97 /* Default floating-point control modes. */ 98 # define FE_DFL_MODE ((const femode_t *) -1L) 99 #endif 100