1 /* Truncate argument to nearest integral value not larger than the argument.
2 Copyright (C) 1997, 1998, 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"
32 EXTRACT_WORDS64 (i0, x);
33 sx = i0 & UINT64_C(0x8000000000000000);
34 j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
38 /* The magnitude of the number is < 1 so the result is +-0. */
39 INSERT_WORDS64 (x, sx);
41 INSERT_WORDS64 (x, sx | (i0 & ~(UINT64_C(0x000fffffffffffff) >> j0)));
46 /* x is inf or NaN. */
52 weak_alias (__trunc, trunc)
54 strong_alias (__trunc, __truncl)
55 weak_alias (__trunc, truncl)