kc3-lang/libquadmath/quadmath-rounding-mode.h

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• Hash : 4f659ab9
  Author : Thomas de Grivel
  Date : 2025-11-02T19:33:45
  

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• quadmath-rounding-mode.h

• /* GCC Quad-Precision Math Library
     Copyright (C) 2012 Free Software Foundation, Inc.
  
  This file is part of the libquadmath library.
  Libquadmath is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.
  
  Libquadmath is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.
  
  You should have received a copy of the GNU Library General Public
  License along with libquadmath; see the file COPYING.LIB.  If
  not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
  Boston, MA 02110-1301, USA.  */
  
  
  #ifndef QUADMATH_ROUNDING_MODE_H
  #define QUADMATH_ROUNDING_MODE_H
  
  #include <stdbool.h>
  
  
  #if defined(HAVE_FENV_H)
  #  include <fenv.h>
  #endif /* HAVE_FENV_H */
  
  static inline int
  get_rounding_mode (void)
  {
  #if defined(HAVE_FENV_H) && (defined(FE_DOWNWARD) || defined(FE_TONEAREST) \
  			     || defined(FE_TOWARDZERO) || defined(FE_UPWARD))
    return fegetround ();
  #else
    return 0;
  #endif
  }
  
  static inline bool
  round_away (bool negative, bool last_digit_odd, bool half_bit, bool more_bits,
              int mode)
  {
    switch (mode)
      {
  #ifdef FE_DOWNWARD
      case FE_DOWNWARD:
        return negative && (half_bit || more_bits);
  #endif
  
  #ifdef FE_DOWNWARD
      case FE_TONEAREST:
        return half_bit && (last_digit_odd || more_bits);
  #endif
  
  #ifdef FE_TOWARDZERO
      case FE_TOWARDZERO:
        return false;
  #endif
  
  
  #ifdef FE_UPWARD
      case FE_UPWARD:
        return !negative && (half_bit || more_bits);
  #endif
  
      default:
        return false;
      }
  }
  
  #endif /* QUADMATH_ROUNDING_MODE_H  */
  

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