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79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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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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<https://www.gnu.org/licenses/>. */
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#include <math.h>
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#include <math_private.h>
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#include <math-svid-compat.h>
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#include <libm-alias-double.h>
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#if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29) \
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|| defined NO_LONG_DOUBLE \
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|| defined LONG_DOUBLE_COMPAT)
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/* wrapper pow */
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double
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__pow_compat (double x, double y)
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{
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double z = __ieee754_pow (x, y);
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if (__glibc_unlikely (!isfinite (z)))
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{
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if (_LIB_VERSION != _IEEE_)
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{
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if (isfinite (x) && isfinite (y))
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{
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if (isnan (z))
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/* pow neg**non-int */
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return __kernel_standard (x, y, 24);
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else if (x == 0.0 && y < 0.0)
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{
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if (signbit (x) && signbit (z))
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/* pow(-0.0,negative) */
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return __kernel_standard (x, y, 23);
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else
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/* pow(+0.0,negative) */
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return __kernel_standard (x, y, 43);
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}
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else
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/* pow overflow */
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return __kernel_standard (x, y, 21);
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}
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}
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}
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else if (__builtin_expect (z == 0.0, 0)
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&& isfinite (x) && x != 0 && isfinite (y)
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&& _LIB_VERSION != _IEEE_)
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/* pow underflow */
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return __kernel_standard (x, y, 22);
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return z;
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}
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# if SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29)
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compat_symbol (libm, __pow_compat, pow, GLIBC_2_0);
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# endif
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# ifdef NO_LONG_DOUBLE
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weak_alias (__pow_compat, powl)
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# endif
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# ifdef LONG_DOUBLE_COMPAT
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/* Work around gas bug "multiple versions for symbol". */
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weak_alias (__pow_compat, __pow_compat_alias)
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LONG_DOUBLE_COMPAT_CHOOSE_libm_powl (
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compat_symbol (libm, __pow_compat_alias, powl, FIRST_VERSION_libm_powl), );
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# endif
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#endif
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