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f67d78192c
This commit moves one step towards the deprecation of wrappers that use _LIB_VERSION / matherr / __kernel_standard functionality, by adding the suffix '_compat' to their filenames and adjusting Makefiles and #includes accordingly. New template wrappers that do not use such functionality will be added by future patches and will be first used by the float128 wrappers.
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* Copyright (C) 2011-2017 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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<http://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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/* wrapper log2f(x) */
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float
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__log2f (float x)
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{
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if (__builtin_expect (islessequal (x, 0.0f), 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_f (x, x, 148); /* 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_f (x, x, 149); /* log2(x<0) */
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}
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}
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return __ieee754_log2f (x);
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}
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weak_alias (__log2f, log2f)
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