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92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* Copyright (C) 2000-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David Huggins-Daines <dhd@debian.org>
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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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<http://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 values of the
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appropriate enable bits in the FPU status word (which,
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coincidentally, are the same as the flag bits, but shifted right by
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27 bits). */
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enum
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{
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FE_INVALID =
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#define FE_INVALID (1<<4) /* V */
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FE_INVALID,
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FE_DIVBYZERO =
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#define FE_DIVBYZERO (1<<3) /* Z */
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FE_DIVBYZERO,
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FE_OVERFLOW =
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#define FE_OVERFLOW (1<<2) /* O */
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FE_OVERFLOW,
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FE_UNDERFLOW =
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#define FE_UNDERFLOW (1<<1) /* U */
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FE_UNDERFLOW,
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FE_INEXACT =
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#define FE_INEXACT (1<<0) /* I */
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FE_INEXACT,
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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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/* The PA-RISC FPU supports all of the four defined rounding modes.
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We use the values of the RM field in the floating point status
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register for the appropriate macros. */
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enum
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{
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FE_TONEAREST =
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#define FE_TONEAREST (0 << 9)
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FE_TONEAREST,
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FE_TOWARDZERO =
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#define FE_TOWARDZERO (1 << 9)
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FE_TOWARDZERO,
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FE_UPWARD =
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#define FE_UPWARD (2 << 9)
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FE_UPWARD,
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FE_DOWNWARD =
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#define FE_DOWNWARD (3 << 9)
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FE_DOWNWARD,
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};
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/* Type representing exception flags. */
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typedef unsigned int fexcept_t;
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/* Type representing floating-point environment. This structure
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corresponds to the layout of the status and exception words in the
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register file. The exception registers are never saved/stored by
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userspace. This structure is also not correctly aligned ever, in
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an ABI error we left out __aligned(8) and subsequently all of our
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fenv functions must accept unaligned input, align the input, and
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then use assembly to store fr0. This is a performance hit, but
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means the ABI is stable. */
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typedef struct
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{
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unsigned int __status_word;
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unsigned int __exception[7];
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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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