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75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
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/* GCC Quad-Precision Math Library
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Copyright (C) 2012 Free Software Foundation, Inc.
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This file is part of the libquadmath library.
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Libquadmath is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libquadmath 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 libquadmath; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifndef QUADMATH_ROUNDING_MODE_H
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#define QUADMATH_ROUNDING_MODE_H
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#include <stdbool.h>
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#if defined(HAVE_FENV_H)
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# include <fenv.h>
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#endif /* HAVE_FENV_H */
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static inline int
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get_rounding_mode (void)
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{
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#if defined(HAVE_FENV_H) && (defined(FE_DOWNWARD) || defined(FE_TONEAREST) \
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|| defined(FE_TOWARDZERO) || defined(FE_UPWARD))
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return fegetround ();
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#else
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return 0;
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#endif
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}
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static inline bool
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round_away (bool negative, bool last_digit_odd, bool half_bit, bool more_bits,
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int mode)
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{
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switch (mode)
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{
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#ifdef FE_DOWNWARD
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case FE_DOWNWARD:
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return negative && (half_bit || more_bits);
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#endif
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#ifdef FE_DOWNWARD
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case FE_TONEAREST:
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return half_bit && (last_digit_odd || more_bits);
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#endif
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#ifdef FE_TOWARDZERO
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case FE_TOWARDZERO:
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return false;
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#endif
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#ifdef FE_UPWARD
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case FE_UPWARD:
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return !negative && (half_bit || more_bits);
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#endif
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default:
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return false;
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}
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}
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#endif /* QUADMATH_ROUNDING_MODE_H */
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