1/* Get NaN payload. ldbl-128 version.
2 Copyright (C) 2016-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <math.h>
20#include <math_private.h>
21#include <stdint.h>
22
23_Float128
24getpayloadl (const _Float128 *x)
25{
26 uint64_t hx, lx;
27 GET_LDOUBLE_WORDS64 (hx, lx, *x);
28 hx &= 0x7fffffffffffULL;
29 /* Construct the representation of the return value directly, since
30 128-bit integers may not be available. */
31 int lz;
32 if (hx == 0)
33 {
34 if (lx == 0)
35 return 0.0L;
36 else
37 lz = __builtin_clzll (lx) + 64;
38 }
39 else
40 lz = __builtin_clzll (hx);
41 int shift = lz - 15;
42 if (shift >= 64)
43 {
44 hx = lx << (shift - 64);
45 lx = 0;
46 }
47 else
48 {
49 /* 2 <= SHIFT <= 63. */
50 hx = (hx << shift) | (lx >> (64 - shift));
51 lx <<= shift;
52 }
53 hx = (hx & 0xffffffffffffULL) | ((0x3fffULL + 127 - lz) << 48);
54 _Float128 ret;
55 SET_LDOUBLE_WORDS64 (ret, hx, lx);
56 return ret;
57}
58