1/* Round to int long double floating-point values.
2 IBM extended format long double version.
3 Copyright (C) 2006-2022 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#define NO_MATH_REDIRECT
21#include <math.h>
22#include <math_private.h>
23#include <math_ldbl_opt.h>
24#include <float.h>
25#include <ieee754.h>
26
27double floor (double) asm ("__floor");
28
29
30long double
31__floorl (long double x)
32{
33 double xh, xl, hi, lo;
34
35 ldbl_unpack (x, &xh, &xl);
36
37 /* Return Inf, Nan, +/-0 unchanged. */
38 if (__builtin_expect (xh != 0.0
39 && __builtin_isless (__builtin_fabs (xh),
40 __builtin_inf ()), 1))
41 {
42 hi = floor (xh);
43 if (hi != xh)
44 {
45 /* The high part is not an integer; the low part does not
46 affect the result. */
47 xh = hi;
48 xl = 0;
49 }
50 else
51 {
52 /* The high part is a nonzero integer. */
53 lo = floor (xl);
54 xh = hi;
55 xl = lo;
56 ldbl_canonicalize_int (&xh, &xl);
57 }
58 }
59 else
60 /* Quiet signaling NaN arguments. */
61 xh += xh;
62
63 return ldbl_pack (xh, xl);
64}
65
66long_double_symbol (libm, __floorl, floorl);
67

source code of glibc/sysdeps/ieee754/ldbl-128ibm/s_floorl.c