1 /* Truncate argument to nearest integral value not larger than the argument.
2 Copyright (C) 1997, 1998 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 libm_hidden_proto(trunc)
34 EXTRACT_WORDS (i0, i1, x);
36 j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
40 /* The magnitude of the number is < 1 so the result is +-0. */
41 INSERT_WORDS (x, sx, 0);
43 INSERT_WORDS (x, sx | (i0 & ~(0x000fffff >> j0)), 0);
48 /* x is inf or NaN. */
53 INSERT_WORDS (x, i0, i1 & ~(0xffffffffu >> (j0 - 20)));
58 libm_hidden_def(trunc)