1 /* Round argument to nearest integral value according to current rounding
3 Copyright (C) 1997, 1999, 2004, 2006 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
6 Jakub Jelinek <jj@ultra.linux.cz>, 1999.
8 The GNU C Library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Lesser General Public
10 License as published by the Free Software Foundation; either
11 version 2.1 of the License, or (at your option) any later version.
13 The GNU C Library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public
19 License along with the GNU C Library; if not, write to the Free
20 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include "math_private.h"
27 static const long double two112[2] =
29 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
30 -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
34 __lrintl (long double x)
38 volatile long double w;
43 GET_LDOUBLE_WORDS64 (i0, i1, x);
44 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
46 i0 &= 0x0000ffffffffffffLL;
47 i0 |= 0x0001000000000000LL;
53 GET_LDOUBLE_WORDS64 (i0, i1, t);
54 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
55 i0 &= 0x0000ffffffffffffLL;
56 i0 |= 0x0001000000000000LL;
58 result = (j0 < 0 ? 0 : i0 >> (48 - j0));
60 else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
63 result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
68 GET_LDOUBLE_WORDS64 (i0, i1, t);
69 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
70 i0 &= 0x0000ffffffffffffLL;
71 i0 |= 0x0001000000000000LL;
74 result = (long int) i0;
76 result = ((long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
81 /* The number is too large. It is left implementation defined
86 return sx ? -result : result;
89 weak_alias (__lrintl, lrintl)