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| 1 | /* Copyright (C) 2000-2024 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 |
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