1*181254a7Smrg /* Round long double to integer away from zero.
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
roundq(__float128 x)26*181254a7Smrg roundq (__float128 x)
27*181254a7Smrg {
28*181254a7Smrg int32_t j0;
29*181254a7Smrg uint64_t i1, i0;
30*181254a7Smrg
31*181254a7Smrg GET_FLT128_WORDS64 (i0, i1, x);
32*181254a7Smrg j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
33*181254a7Smrg if (j0 < 48)
34*181254a7Smrg {
35*181254a7Smrg if (j0 < 0)
36*181254a7Smrg {
37*181254a7Smrg i0 &= 0x8000000000000000ULL;
38*181254a7Smrg if (j0 == -1)
39*181254a7Smrg i0 |= 0x3fff000000000000LL;
40*181254a7Smrg i1 = 0;
41*181254a7Smrg }
42*181254a7Smrg else
43*181254a7Smrg {
44*181254a7Smrg uint64_t i = 0x0000ffffffffffffLL >> j0;
45*181254a7Smrg if (((i0 & i) | i1) == 0)
46*181254a7Smrg /* X is integral. */
47*181254a7Smrg return x;
48*181254a7Smrg
49*181254a7Smrg i0 += 0x0000800000000000LL >> j0;
50*181254a7Smrg i0 &= ~i;
51*181254a7Smrg i1 = 0;
52*181254a7Smrg }
53*181254a7Smrg }
54*181254a7Smrg else if (j0 > 111)
55*181254a7Smrg {
56*181254a7Smrg if (j0 == 0x4000)
57*181254a7Smrg /* Inf or NaN. */
58*181254a7Smrg return x + x;
59*181254a7Smrg else
60*181254a7Smrg return x;
61*181254a7Smrg }
62*181254a7Smrg else
63*181254a7Smrg {
64*181254a7Smrg uint64_t i = -1ULL >> (j0 - 48);
65*181254a7Smrg if ((i1 & i) == 0)
66*181254a7Smrg /* X is integral. */
67*181254a7Smrg return x;
68*181254a7Smrg
69*181254a7Smrg uint64_t j = i1 + (1LL << (111 - j0));
70*181254a7Smrg if (j < i1)
71*181254a7Smrg i0 += 1;
72*181254a7Smrg i1 = j;
73*181254a7Smrg i1 &= ~i;
74*181254a7Smrg }
75*181254a7Smrg
76*181254a7Smrg SET_FLT128_WORDS64 (x, i0, i1);
77*181254a7Smrg return x;
78*181254a7Smrg }
79