1 /* Round long double value to long int.
2 Copyright (C) 1997, 1999, 2004 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
5 Jakub Jelinek <jj@ultra.linux.cz>, 1999.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include "math_private.h"
28 __lroundl (long double x)
35 GET_LDOUBLE_WORDS64 (i0, i1, x);
36 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
37 sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1;
38 i0 &= 0x0000ffffffffffffLL;
39 i0 |= 0x0001000000000000LL;
44 return j0 < -1 ? 0 : sign;
47 i0 += 0x0000800000000000LL >> j0;
48 result = i0 >> (48 - j0);
51 else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
54 result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
57 u_int64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48));
62 result = (long int) i0;
64 result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0));
69 /* The number is too large. It is left implementation defined
77 weak_alias (__lroundl, lroundl)