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/* Multiple versions of memcmp
All versions must be listed in ifunc-impl-list.c.
Copyright (C) 2010-2017 Free Software Foundation, Inc.
Contributed by Intel Corporation.
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/>. */
#include <sysdep.h>
#include <init-arch.h>
/* Define multiple versions only for the definition in libc. */
#if IS_IN (libc)
.text
ENTRY(memcmp)
.type memcmp, @gnu_indirect_function
LOAD_RTLD_GLOBAL_RO_RDX
HAS_ARCH_FEATURE (Prefer_No_VZEROUPPER)
jnz 1f
HAS_ARCH_FEATURE (AVX2_Usable)
jz 1f
HAS_CPU_FEATURE (MOVBE)
jz 1f
HAS_ARCH_FEATURE (AVX_Fast_Unaligned_Load)
jz 1f
leaq __memcmp_avx2_movbe(%rip), %rax
ret
1: HAS_CPU_FEATURE (SSSE3)
jnz 2f
leaq __memcmp_sse2(%rip), %rax
ret
2: HAS_CPU_FEATURE (SSE4_1)
jz 3f
leaq __memcmp_sse4_1(%rip), %rax
ret
3: leaq __memcmp_ssse3(%rip), %rax
ret
END(memcmp)
# undef ENTRY
# define ENTRY(name) \
.type __memcmp_sse2, @function; \
.p2align 4; \
.globl __memcmp_sse2; \
.hidden __memcmp_sse2; \
__memcmp_sse2: cfi_startproc; \
CALL_MCOUNT
# undef END
# define END(name) \
cfi_endproc; .size __memcmp_sse2, .-__memcmp_sse2
# ifdef SHARED
# undef libc_hidden_builtin_def
/* It doesn't make sense to send libc-internal memcmp calls through a PLT.
The speedup we get from using SSE4 instructions is likely eaten away
by the indirect call in the PLT. */
# define libc_hidden_builtin_def(name) \
.globl __GI_memcmp; __GI_memcmp = __memcmp_sse2
# endif
#endif
#include "../memcmp.S"
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