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/* Multiple versions of memcpy.
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* Define multiple versions only for the definition in lib and for
DSO. In static binaries we need memcpy before the initialization
happened. */
#if defined SHARED && IS_IN (libc)
/* Redefine memcpy so that the compiler won't complain about the type
mismatch with the IFUNC selector in strong_alias, below. */
# undef memcpy
# define memcpy __redirect_memcpy
# include <string.h>
# undef memcpy
# include <init-arch.h>
extern __typeof (__redirect_memcpy) __memcpy_i386 attribute_hidden;
extern __typeof (__redirect_memcpy) __memcpy_i586 attribute_hidden;
extern __typeof (__redirect_memcpy) __memcpy_i686 attribute_hidden;
extern __typeof (__redirect_memcpy) __memcpy_sse2_unaligned attribute_hidden;
extern __typeof (__redirect_memcpy) __memcpy_ssse3 attribute_hidden;
extern __typeof (__redirect_memcpy) __memcpy_ssse3_rep attribute_hidden;
/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
ifunc symbol properly. */
extern __typeof (__redirect_memcpy) memcpy;
extern void *memcpy_ifunc (void) __asm__ ("memcpy");
void *
memcpy_ifunc (void)
{
if (HAS_CPU_FEATURE (SSE2))
{
if (HAS_ARCH_FEATURE (Fast_Unaligned_Load))
return __memcpy_sse2_unaligned;
else if (HAS_CPU_FEATURE (SSSE3))
{
if (HAS_ARCH_FEATURE (Fast_Rep_String))
return __memcpy_ssse3_rep;
else
return __memcpy_ssse3;
}
}
if (USE_I686)
return __memcpy_i686;
else if (USE_I586)
return __memcpy_i586;
else
return __memcpy_i386;
}
__asm__ (".type memcpy, %gnu_indirect_function");
#endif
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