1/* Truncate argument to nearest integral value not larger than the argument.
2 Copyright (C) 1997-2017 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, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 02111-1307 USA. */
21
22#include "quadmath-imp.h"
23
24
25__float128
26truncq (__float128 x)
27{
28 int32_t j0;
29 uint64_t i0, i1, sx;
30
31 GET_FLT128_WORDS64 (i0, i1, x);
32 sx = i0 & 0x8000000000000000ULL;
33 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
34 if (j0 < 48)
35 {
36 if (j0 < 0)
37 /* The magnitude of the number is < 1 so the result is +-0. */
38 SET_FLT128_WORDS64 (x, sx, 0);
39 else
40 SET_FLT128_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0);
41 }
42 else if (j0 > 111)
43 {
44 if (j0 == 0x4000)
45 /* x is inf or NaN. */
46 return x + x;
47 }
48 else
49 {
50 SET_FLT128_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48)));
51 }
52
53 return x;
54}
55