1/* Truncate argument to nearest integral value not larger than the argument.
2 Copyright (C) 1997-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
5 Jakub Jelinek <jj@ultra.linux.cz>, 1999.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
20
21#include <math.h>
22
23#include <math_private.h>
24#include <libm-alias-ldouble.h>
25
26
27_Float128
28__truncl (_Float128 x)
29{
30 int32_t j0;
31 uint64_t i0, i1, sx;
32
33 GET_LDOUBLE_WORDS64 (i0, i1, x);
34 sx = i0 & 0x8000000000000000ULL;
35 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
36 if (j0 < 48)
37 {
38 if (j0 < 0)
39 /* The magnitude of the number is < 1 so the result is +-0. */
40 SET_LDOUBLE_WORDS64 (x, sx, 0);
41 else
42 SET_LDOUBLE_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0);
43 }
44 else if (j0 > 111)
45 {
46 if (j0 == 0x4000)
47 /* x is inf or NaN. */
48 return x + x;
49 }
50 else
51 {
52 SET_LDOUBLE_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48)));
53 }
54
55 return x;
56}
57libm_alias_ldouble (__trunc, trunc)
58