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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/* Round long double value to long long int.
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Copyright (C) 1997, 2001 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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__llroundl (long double x)
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{
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int32_t j0;
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u_int32_t se, i1, i0;
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long long int result;
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int sign;
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GET_LDOUBLE_WORDS (se, i0, i1, x);
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j0 = (se & 0x7fff) - 0x3fff;
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sign = (se & 0x8000) != 0 ? -1 : 1;
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if (j0 < 31)
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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
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{
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u_int32_t j = i0 + (0x40000000 >> j0);
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if (j < i0)
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{
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j >>= 1;
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j |= 0x80000000;
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++j0;
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}
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result = j >> (31 - j0);
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}
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}
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else if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
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{
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if (j0 >= 63)
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result = (((long long int) i0 << 32) | i1) << (j0 - 63);
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else
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{
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u_int32_t j = i1 + (0x80000000 >> (j0 - 31));
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result = (long long int) i0;
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if (j < i1)
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++result;
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if (j0 > 31)
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result = (result << (j0 - 31)) | (j >> (63 - 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 (__llroundl, llroundl)
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