1 | /* long double square root in software floating-point emulation. |
2 | Copyright (C) 1997-2022 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 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdlib.h> |
20 | #include <soft-fp.h> |
21 | #include <quad.h> |
22 | #include <shlib-compat.h> |
23 | |
24 | long double |
25 | __ieee754_sqrtl (const long double a) |
26 | { |
27 | FP_DECL_EX; |
28 | FP_DECL_Q(A); FP_DECL_Q(C); |
29 | long double c; |
30 | long _round = 4; /* dynamic rounding */ |
31 | |
32 | FP_INIT_ROUNDMODE; |
33 | FP_UNPACK_Q(A, a); |
34 | FP_SQRT_Q(C, A); |
35 | FP_PACK_Q(c, C); |
36 | FP_HANDLE_EXCEPTIONS; |
37 | return c; |
38 | } |
39 | |
40 | /* ??? We forgot to add this symbol in 2.15. Getting this into 2.18 isn't as |
41 | straight-forward as just adding the alias, since a generic Versions file |
42 | includes the 2.15 version and the linker uses the first one it sees. */ |
43 | #if SHLIB_COMPAT (libm, GLIBC_2_15, GLIBC_2_18) |
44 | compat_symbol (libm, __ieee754_sqrtl, __sqrtl_finite, GLIBC_2_18); |
45 | #endif |
46 | |