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f6b10ed8e9
On Skylake, it improves log2 bench performance by:
Before After Improvement
max 208.779 63.827 69%
min 9.977 6.55 34%
mean 10.366 6.8191 34%
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/* Multiple versions of log2.
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Copyright (C) 2023 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 <libm-alias-double.h>
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#include <libm-alias-finite.h>
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extern double __redirect_log2 (double);
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#define SYMBOL_NAME log2
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#include "ifunc-fma.h"
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libc_ifunc_redirected (__redirect_log2, __log2, IFUNC_SELECTOR ());
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#ifdef SHARED
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__hidden_ver1 (__log2, __GI___log2, __redirect_log2)
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__attribute__ ((visibility ("hidden")));
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versioned_symbol (libm, __ieee754_log2, log2, GLIBC_2_29);
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libm_alias_double_other (__log2, log2)
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#else
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libm_alias_double (__log2, log2)
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#endif
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strong_alias (__log2, __ieee754_log2)
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libm_alias_finite (__log2, __log2)
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#define __log2 __log2_sse2
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#include <sysdeps/ieee754/dbl-64/e_log2.c>
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