132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/* Copyright (C) 1997-2018 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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<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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#if defined __HAVE_68881__ || defined __HAVE_FPU__ || defined __mcffpu__
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/* Define bits representing the exception. We use the bit positions of
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the appropriate bits in the FPSR Accrued Exception Byte. */
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enum
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{
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FE_INEXACT =
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# define FE_INEXACT (1 << 3)
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FE_INEXACT,
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FE_DIVBYZERO =
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# define FE_DIVBYZERO (1 << 4)
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FE_DIVBYZERO,
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FE_UNDERFLOW =
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# define FE_UNDERFLOW (1 << 5)
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FE_UNDERFLOW,
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FE_OVERFLOW =
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# define FE_OVERFLOW (1 << 6)
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FE_OVERFLOW,
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FE_INVALID =
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# define FE_INVALID (1 << 7)
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FE_INVALID
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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 m68k FPU supports all of the four defined rounding modes. We use
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the bit positions in the FPCR Mode Control Byte as the values for the
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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
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FE_TONEAREST,
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FE_TOWARDZERO =
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# define FE_TOWARDZERO (1 << 4)
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FE_TOWARDZERO,
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FE_DOWNWARD =
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# define FE_DOWNWARD (2 << 4)
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FE_DOWNWARD,
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FE_UPWARD =
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# define FE_UPWARD (3 << 4)
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FE_UPWARD
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};
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#else
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/* In the soft-float case, only rounding to nearest is supported, with
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no exceptions. */
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# define FE_ALL_EXCEPT 0
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enum
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{
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__FE_UNDEFINED = -1,
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FE_TONEAREST =
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# define FE_TONEAREST 0
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FE_TONEAREST
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};
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#endif
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/* Type representing exception flags. */
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typedef unsigned int fexcept_t;
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#if defined __HAVE_68881__ || defined __HAVE_FPU__ || defined __mcffpu__
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/* Type representing floating-point environment. This structure
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corresponds to the layout of the block written by `fmovem'. */
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typedef struct
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{
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unsigned int __control_register;
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unsigned int __status_register;
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unsigned int __instruction_address;
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}
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fenv_t;
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#else
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/* Keep ABI compatibility with the type used in the generic
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bits/fenv.h, formerly used for no-FPU ColdFire. */
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typedef struct
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{
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fexcept_t __excepts;
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}
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fenv_t;
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#endif
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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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#if defined __USE_GNU && (defined __HAVE_68881__ \
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|| defined __HAVE_FPU__ \
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|| defined __mcffpu__)
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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)
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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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