mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-11 19:49:32 +00:00
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
|
/* 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 */
|