1 /* Round double to integer away from zero.
2 Copyright (C) 1997, 2009 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include "math_private.h"
26 static const double huge = 1.0e300;
34 EXTRACT_WORDS64 (i0, x);
35 j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
36 if (__builtin_expect (j0 < 52, 1))
42 i0 &= UINT64_C(0x8000000000000000);
44 i0 |= UINT64_C(0x3ff0000000000000);
49 uint64_t i = UINT64_C(0x000fffffffffffff) >> j0;
55 /* Raise inexact if x != 0. */
56 i0 += UINT64_C(0x0008000000000000) >> j0;
70 INSERT_WORDS64 (x, i0);
73 weak_alias (__round, round)
75 strong_alias (__round, __roundl)
76 weak_alias (__round, roundl)