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-rw-r--r--include/rounding-mode.h65
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diff --git a/include/rounding-mode.h b/include/rounding-mode.h
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-/* Handle floating-point rounding mode within libc.
- Copyright (C) 2012-2017 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#ifndef _ROUNDING_MODE_H
-#define _ROUNDING_MODE_H 1
-
-#include <fenv.h>
-#include <stdbool.h>
-#include <stdlib.h>
-
-/* Get the architecture-specific definition of how to determine the
- rounding mode in libc. This header must also define the FE_*
- macros for any standard rounding modes the architecture does not
- have in <fenv.h>, to arbitrary distinct values. */
-#include <get-rounding-mode.h>
-
-/* Return true if a number should be rounded away from zero in
- rounding mode MODE, false otherwise. NEGATIVE is true if the
- number is negative, false otherwise. LAST_DIGIT_ODD is true if the
- last digit of the truncated value (last bit for binary) is odd,
- false otherwise. HALF_BIT is true if the number is at least half
- way from the truncated value to the next value with the
- least-significant digit in the same place, false otherwise.
- MORE_BITS is true if the number is not exactly equal to the
- truncated value or the half-way value, false otherwise. */
-
-static bool
-round_away (bool negative, bool last_digit_odd, bool half_bit, bool more_bits,
- int mode)
-{
- switch (mode)
- {
- case FE_DOWNWARD:
- return negative && (half_bit || more_bits);
-
- case FE_TONEAREST:
- return half_bit && (last_digit_odd || more_bits);
-
- case FE_TOWARDZERO:
- return false;
-
- case FE_UPWARD:
- return !negative && (half_bit || more_bits);
-
- default:
- abort ();
- }
-}
-
-#endif /* rounding-mode.h */