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94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/* Copyright (C) 1997-2013 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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#include <bits/wordsize.h>
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/* Define bits representing the exception. We use the bit positions
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of the appropriate accrued exception bits from the FSR. */
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enum
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{
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FE_INVALID =
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#define FE_INVALID (1 << 9)
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FE_INVALID,
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FE_OVERFLOW =
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#define FE_OVERFLOW (1 << 8)
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FE_OVERFLOW,
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FE_UNDERFLOW =
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#define FE_UNDERFLOW (1 << 7)
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FE_UNDERFLOW,
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FE_DIVBYZERO =
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#define FE_DIVBYZERO (1 << 6)
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FE_DIVBYZERO,
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FE_INEXACT =
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#define FE_INEXACT (1 << 5)
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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 Sparc FPU supports all of the four defined rounding modes. We
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use again the bit positions in the FPU control word as the values
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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 << 30)
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FE_TONEAREST,
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FE_TOWARDZERO =
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#define FE_TOWARDZERO (1 << 30)
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FE_TOWARDZERO,
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FE_UPWARD =
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#define FE_UPWARD (-0x7fffffff - 1) /* (2 << 30) */
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FE_UPWARD,
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FE_DOWNWARD =
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#define FE_DOWNWARD (-0x40000000) /* (3 << 30) */
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FE_DOWNWARD
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};
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#define __FE_ROUND_MASK (3U << 30)
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/* Type representing exception flags. */
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typedef unsigned long int fexcept_t;
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/* Type representing floating-point environment. */
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typedef unsigned long int 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 exception is masked. */
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# define FE_NOMASK_ENV ((const fenv_t *) -2)
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#endif
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/* For internal use only: access the fp state register. */
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#if __WORDSIZE == 64
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# define __fenv_stfsr(X) __asm__ __volatile__ ("stx %%fsr,%0" : "=m" (X))
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# define __fenv_ldfsr(X) __asm__ __volatile__ ("ldx %0,%%fsr" : : "m" (X))
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#else
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# define __fenv_stfsr(X) __asm__ __volatile__ ("st %%fsr,%0" : "=m" (X))
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# define __fenv_ldfsr(X) __asm__ __volatile__ ("ld %0,%%fsr" : : "m" (X))
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#endif
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