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1/* long double square root in software floating-point emulation.
2 Copyright (C) 1997-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Richard Henderson (rth@cygnus.com) and
5 Jakub Jelinek (jj@ultra.linux.cz).
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library. If not, see
19 <http://www.gnu.org/licenses/>. */
20
21#include <stdlib.h>
22#include <soft-fp.h>
23#include <quad.h>
24#include <shlib-compat.h>
25
26long double
27__ieee754_sqrtl (const long double a)
28{
29 FP_DECL_EX;
30 FP_DECL_Q(A); FP_DECL_Q(C);
31 long double c;
32 long _round = 4; /* dynamic rounding */
33
34 FP_INIT_ROUNDMODE;
35 FP_UNPACK_Q(A, a);
36 FP_SQRT_Q(C, A);
37 FP_PACK_Q(c, C);
38 FP_HANDLE_EXCEPTIONS;
39 return c;
40}
41
42/* ??? We forgot to add this symbol in 2.15. Getting this into 2.18 isn't as
43 straight-forward as just adding the alias, since a generic Versions file
44 includes the 2.15 version and the linker uses the first one it sees. */
45#if SHLIB_COMPAT (libm, GLIBC_2_15, GLIBC_2_18)
46versioned_symbol (libm, __ieee754_sqrtl, __sqrtl_finite, GLIBC_2_18);
47#else
48strong_alias(__ieee754_sqrtl, __sqrtl_finite)
49#endif
50

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