2012-03-16 15:14:56 -07:00
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/* Round double value to long long int.
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Copyright (C) 1997-2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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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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#define lround __hidden_lround
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#define __lround __hidden___lround
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#include <math.h>
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#include <math_private.h>
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long long int
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__llround (double x)
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{
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int32_t j0;
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int64_t i0;
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long long int result;
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int sign;
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EXTRACT_WORDS64 (i0, x);
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j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
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sign = i0 < 0 ? -1 : 1;
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i0 &= UINT64_C(0xfffffffffffff);
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i0 |= UINT64_C(0x10000000000000);
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if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
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{
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if (j0 < 0)
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return j0 < -1 ? 0 : sign;
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else if (j0 >= 52)
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result = i0 << (j0 - 52);
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else
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{
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i0 += UINT64_C(0x8000000000000) >> j0;
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result = i0 >> (52 - j0);
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}
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}
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else
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{
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/* The number is too large. It is left implementation defined
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what happens. */
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return (long long int) x;
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}
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return sign * result;
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}
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weak_alias (__llround, llround)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__llround, __lroundl)
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weak_alias (__llround, lroundl)
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#endif
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/* long has the same width as long long on 64-bit machines. */
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#undef lround
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#undef __lround
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strong_alias (__llround, __lround)
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weak_alias (__llround, lround)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__llround, __llroundl)
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weak_alias (__llround, llroundl)
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#endif
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