1 /* Round double to integer away from zero.
2 Copyright (C) 1997 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;
35 EXTRACT_WORDS (i0, i1, x);
36 j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
51 u_int32_t i = 0x000fffff >> j0;
52 if (((i0 & i) | i1) == 0)
57 /* Raise inexact if x != 0. */
58 i0 += 0x00080000 >> j0;
74 u_int32_t i = 0xffffffff >> (j0 - 20);
81 /* Raise inexact if x != 0. */
82 u_int32_t j = i1 + (1 << (51 - j0));
90 INSERT_WORDS (x, i0, i1);
93 weak_alias (__round, round)
95 strong_alias (__round, __roundl)
96 weak_alias (__round, roundl)