1 | /* Truncate (toward zero) long double floating-point values. |
2 | IBM extended format long double version. |
3 | Copyright (C) 2006-2024 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 | |
27 | double ceil (double) asm ("__ceil" ); |
28 | double floor (double) asm ("__floor" ); |
29 | double trunc (double) asm ("__trunc" ); |
30 | |
31 | |
32 | long double |
33 | __truncl (long double x) |
34 | { |
35 | double xh, xl, hi, lo; |
36 | |
37 | ldbl_unpack (x, &xh, &xl); |
38 | |
39 | /* Return Inf, Nan, +/-0 unchanged. */ |
40 | if (__builtin_expect (xh != 0.0 |
41 | && __builtin_isless (__builtin_fabs (xh), |
42 | __builtin_inf ()), 1)) |
43 | { |
44 | hi = trunc (xh); |
45 | if (hi != xh) |
46 | { |
47 | /* The high part is not an integer; the low part does not |
48 | affect the result. */ |
49 | xh = hi; |
50 | xl = 0; |
51 | } |
52 | else |
53 | { |
54 | /* The high part is a nonzero integer. */ |
55 | lo = xh > 0 ? floor (xl) : ceil (xl); |
56 | xh = hi; |
57 | xl = lo; |
58 | ldbl_canonicalize_int (&xh, &xl); |
59 | } |
60 | } |
61 | else |
62 | /* Quiet signaling NaN arguments. */ |
63 | xh += xh; |
64 | |
65 | return ldbl_pack (xh, xl); |
66 | } |
67 | |
68 | long_double_symbol (libm, __truncl, truncl); |
69 | |