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19c4bec0f4
This patch changes de default symbol redirection for internal call of memcpy, memset, memchr, and strlen to the IFUNC resolved ones. The performance improvement is noticeable in algorithms that uses these symbols extensible, like the regex functions.
51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
/* Multiple versions of memset.
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Copyright (C) 2013-2014 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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<http://www.gnu.org/licenses/>. */
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/* Define multiple versions only for definition in libc. */
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#if defined SHARED && !defined NOT_IN_libc
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/* Redefine memset so that the compiler won't complain about the type
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mismatch with the IFUNC selector in strong_alias, below. */
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# undef memset
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# define memset __redirect_memset
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# include <string.h>
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# include <shlib-compat.h>
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# include "init-arch.h"
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extern __typeof (__redirect_memset) __libc_memset;
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extern __typeof (__redirect_memset) __memset_ppc attribute_hidden;
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extern __typeof (__redirect_memset) __memset_power4 attribute_hidden;
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extern __typeof (__redirect_memset) __memset_power6 attribute_hidden;
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extern __typeof (__redirect_memset) __memset_power7 attribute_hidden;
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/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
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ifunc symbol properly. */
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libc_ifunc (__libc_memset,
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(hwcap & PPC_FEATURE_HAS_VSX)
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? __memset_power7 :
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(hwcap & PPC_FEATURE_ARCH_2_05)
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? __memset_power6 :
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(hwcap & PPC_FEATURE_POWER4)
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? __memset_power4
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: __memset_ppc);
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#undef memset
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strong_alias (__libc_memset, memset);
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libc_hidden_ver (__libc_memset, memset);
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#endif
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