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84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/* Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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 = 0x80,
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#define FE_INVALID FE_INVALID
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FE_DIVBYZERO = 0x40,
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#define FE_DIVBYZERO FE_DIVBYZERO
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FE_OVERFLOW = 0x20,
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#define FE_OVERFLOW FE_OVERFLOW
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FE_UNDERFLOW = 0x10,
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#define FE_UNDERFLOW FE_UNDERFLOW
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FE_INEXACT = 0x08
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#define FE_INEXACT 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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*/
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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 = 0,
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#define FE_TONEAREST FE_TONEAREST
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FE_DOWNWARD = 0x3,
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#define FE_DOWNWARD FE_DOWNWARD
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FE_UPWARD = 0x2,
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#define FE_UPWARD FE_UPWARD
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FE_TOWARDZERO = 0x1
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#define FE_TOWARDZERO 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 written by the `fstenv'. */
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typedef struct
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{
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fexcept_t fpc;
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void *ieee_instruction_pointer;
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/* failing instruction for ieee exceptions */
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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 ((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 ((fenv_t *) -2)
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#endif
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