100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
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/* Copyright (C) 2000-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _FENV_H
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# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
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#endif
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/* Define bits representing the exception. We use the bit positions
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of the appropriate bits in the FPU control word. */
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enum
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{
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FE_INVALID =
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#define FE_INVALID 0x80
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FE_INVALID,
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FE_DIVBYZERO =
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#define FE_DIVBYZERO 0x40
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FE_DIVBYZERO,
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FE_OVERFLOW =
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#define FE_OVERFLOW 0x20
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FE_OVERFLOW,
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FE_UNDERFLOW =
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#define FE_UNDERFLOW 0x10
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FE_UNDERFLOW,
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FE_INEXACT =
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#define FE_INEXACT 0x08
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FE_INEXACT
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};
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/* We dont use the y bit of the DXC in the floating point control register
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as glibc has no FE encoding for fe inexact incremented
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or fe inexact truncated.
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We currently use the flag bits in the fpc
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as these are sticky for feholdenv & feupdatenv as it is defined
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in the HP Manpages. */
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#define FE_ALL_EXCEPT \
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(FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
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enum
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{
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FE_TONEAREST =
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#define FE_TONEAREST 0
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FE_TONEAREST,
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FE_DOWNWARD =
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#define FE_DOWNWARD 0x3
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FE_DOWNWARD,
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FE_UPWARD =
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#define FE_UPWARD 0x2
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FE_UPWARD,
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FE_TOWARDZERO =
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#define FE_TOWARDZERO 0x1
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FE_TOWARDZERO
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};
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/* Type representing exception flags. */
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typedef unsigned int fexcept_t; /* size of fpc */
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/* Type representing floating-point environment. This function corresponds
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to the layout of the block used by fegetenv and fesetenv. */
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typedef struct
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{
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fexcept_t __fpc;
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void *__unused;
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/* The field __unused (formerly __ieee_instruction_pointer) is a relict from
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commit "Remove PTRACE_PEEKUSER" (87b9b50f0d4b92248905e95a06a13c513dc45e59)
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and isn't used anymore. */
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} fenv_t;
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/* If the default argument is used we use this value. */
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#define FE_DFL_ENV ((const fenv_t *) -1)
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#ifdef __USE_GNU
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/* Floating-point environment where none of the exceptions are masked. */
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# define FE_NOMASK_ENV ((const fenv_t *) -2)
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#endif
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#if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
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/* Type representing floating-point control modes. */
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typedef unsigned int femode_t;
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/* Default floating-point control modes. */
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# define FE_DFL_MODE ((const femode_t *) -1L)
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#endif
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