62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/* Copyright (C) 2011-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <fenv.h>
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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_1, GLIBC_2_29) \
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|| defined NO_LONG_DOUBLE \
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|| defined LONG_DOUBLE_COMPAT)
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/* wrapper log2(x) */
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double
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__log2_compat (double x)
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{
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if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_)
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{
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if (x == 0.0)
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{
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feraiseexcept (FE_DIVBYZERO);
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return __kernel_standard (x, x, 48); /* log2(0) */
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}
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else
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{
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feraiseexcept (FE_INVALID);
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return __kernel_standard (x, x, 49); /* log2(x<0) */
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}
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}
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return __ieee754_log2 (x);
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}
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# if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29)
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compat_symbol (libm, __log2_compat, log2, GLIBC_2_1);
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# endif
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# ifdef NO_LONG_DOUBLE
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weak_alias (__log2_compat, log2l)
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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 (__log2_compat, __log2_compat_alias)
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LONG_DOUBLE_COMPAT_CHOOSE_libm_log2l (
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compat_symbol (libm, __log2_compat_alias, log2l, FIRST_VERSION_libm_log2l), );
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# endif
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#endif
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