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f964490f RM |
1 | /* Round to int long double floating-point values. |
2 | IBM extended format long double version. | |
bfff8b1b | 3 | Copyright (C) 2006-2017 Free Software Foundation, Inc. |
f964490f RM |
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 | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
f964490f | 19 | |
f964490f | 20 | #include <math.h> |
f964490f RM |
21 | #include <math_ldbl_opt.h> |
22 | #include <float.h> | |
23 | #include <ieee754.h> | |
24 | ||
25 | ||
f964490f RM |
26 | long double |
27 | __floorl (long double x) | |
f964490f | 28 | { |
5c68d401 | 29 | double xh, xl, hi, lo; |
f964490f | 30 | |
5c68d401 | 31 | ldbl_unpack (x, &xh, &xl); |
f964490f | 32 | |
5c68d401 RM |
33 | /* Return Inf, Nan, +/-0 unchanged. */ |
34 | if (__builtin_expect (xh != 0.0 | |
35 | && __builtin_isless (__builtin_fabs (xh), | |
36 | __builtin_inf ()), 1)) | |
16f0eced | 37 | { |
1833769e JM |
38 | hi = __floor (xh); |
39 | if (hi != xh) | |
40 | { | |
41 | /* The high part is not an integer; the low part does not | |
42 | affect the result. */ | |
43 | xh = hi; | |
44 | xl = 0; | |
45 | } | |
46 | else | |
47 | { | |
48 | /* The high part is a nonzero integer. */ | |
49 | lo = __floor (xl); | |
50 | xh = hi; | |
51 | xl = lo; | |
52 | ldbl_canonicalize_int (&xh, &xl); | |
53 | } | |
f964490f | 54 | } |
bba14195 JM |
55 | else |
56 | /* Quiet signaling NaN arguments. */ | |
57 | xh += xh; | |
f964490f | 58 | |
5c68d401 | 59 | return ldbl_pack (xh, xl); |
f964490f RM |
60 | } |
61 | ||
62 | long_double_symbol (libm, __floorl, floorl); |