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47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/* Round a 64-bit floating point value to the nearest integer.
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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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#include <math.h>
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double
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__rint (double x)
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{
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static const float TWO52 = 4503599627370496.0;
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if (fabs (x) < TWO52)
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{
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if (x > 0.0)
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{
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x += TWO52;
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x -= TWO52;
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}
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else if (x < 0.0)
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{
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x = TWO52 - x;
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x = -(x - TWO52);
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}
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}
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return x;
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}
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weak_alias (__rint, rint)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__rint, __rintl)
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weak_alias (__rint, rintl)
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#endif
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