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50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* long double square root in software floating-point emulation.
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Copyright (C) 1997-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson (rth@cygnus.com) and
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Jakub Jelinek (jj@ultra.linux.cz).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <soft-fp.h>
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#include <quad.h>
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#include <shlib-compat.h>
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long double
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__ieee754_sqrtl (const long double a)
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{
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FP_DECL_EX;
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FP_DECL_Q(A); FP_DECL_Q(C);
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long double c;
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long _round = 4; /* dynamic rounding */
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FP_INIT_ROUNDMODE;
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FP_UNPACK_Q(A, a);
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FP_SQRT_Q(C, A);
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FP_PACK_Q(c, C);
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FP_HANDLE_EXCEPTIONS;
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return c;
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}
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/* ??? We forgot to add this symbol in 2.15. Getting this into 2.18 isn't as
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straight-forward as just adding the alias, since a generic Versions file
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includes the 2.15 version and the linker uses the first one it sees. */
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#if SHLIB_COMPAT (libm, GLIBC_2_15, GLIBC_2_18)
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versioned_symbol (libm, __ieee754_sqrtl, __sqrtl_finite, GLIBC_2_18);
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#else
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strong_alias(__ieee754_sqrtl, __sqrtl_finite)
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#endif
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