1*181254a7Smrg /* Truncate argument to nearest integral value not larger than the argument.
2*181254a7Smrg Copyright (C) 1997-2018 Free Software Foundation, Inc.
3*181254a7Smrg This file is part of the GNU C Library.
4*181254a7Smrg Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
5*181254a7Smrg Jakub Jelinek <jj@ultra.linux.cz>, 1999.
6*181254a7Smrg
7*181254a7Smrg The GNU C Library is free software; you can redistribute it and/or
8*181254a7Smrg modify it under the terms of the GNU Lesser General Public
9*181254a7Smrg License as published by the Free Software Foundation; either
10*181254a7Smrg version 2.1 of the License, or (at your option) any later version.
11*181254a7Smrg
12*181254a7Smrg The GNU C Library is distributed in the hope that it will be useful,
13*181254a7Smrg but WITHOUT ANY WARRANTY; without even the implied warranty of
14*181254a7Smrg MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15*181254a7Smrg Lesser General Public License for more details.
16*181254a7Smrg
17*181254a7Smrg You should have received a copy of the GNU Lesser General Public
18*181254a7Smrg License along with the GNU C Library; if not, see
19*181254a7Smrg <http://www.gnu.org/licenses/>. */
20*181254a7Smrg
21*181254a7Smrg #define NO_MATH_REDIRECT
22*181254a7Smrg
23*181254a7Smrg #include "quadmath-imp.h"
24*181254a7Smrg
25*181254a7Smrg __float128
truncq(__float128 x)26*181254a7Smrg truncq (__float128 x)
27*181254a7Smrg {
28*181254a7Smrg int32_t j0;
29*181254a7Smrg uint64_t i0, i1, sx;
30*181254a7Smrg
31*181254a7Smrg GET_FLT128_WORDS64 (i0, i1, x);
32*181254a7Smrg sx = i0 & 0x8000000000000000ULL;
33*181254a7Smrg j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
34*181254a7Smrg if (j0 < 48)
35*181254a7Smrg {
36*181254a7Smrg if (j0 < 0)
37*181254a7Smrg /* The magnitude of the number is < 1 so the result is +-0. */
38*181254a7Smrg SET_FLT128_WORDS64 (x, sx, 0);
39*181254a7Smrg else
40*181254a7Smrg SET_FLT128_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0);
41*181254a7Smrg }
42*181254a7Smrg else if (j0 > 111)
43*181254a7Smrg {
44*181254a7Smrg if (j0 == 0x4000)
45*181254a7Smrg /* x is inf or NaN. */
46*181254a7Smrg return x + x;
47*181254a7Smrg }
48*181254a7Smrg else
49*181254a7Smrg {
50*181254a7Smrg SET_FLT128_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48)));
51*181254a7Smrg }
52*181254a7Smrg
53*181254a7Smrg return x;
54*181254a7Smrg }
55