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71 lines
2.0 KiB
ArmAsm
71 lines
2.0 KiB
ArmAsm
/* Multiple versions of memcmp
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All versions must be listed in ifunc-impl-list.c.
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Copyright (C) 2010-2014 Free Software Foundation, Inc.
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Contributed by Intel Corporation.
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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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#include <sysdep.h>
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#include <init-arch.h>
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/* Define multiple versions only for the definition in libc. */
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#ifndef NOT_IN_libc
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.text
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ENTRY(memcmp)
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.type memcmp, @gnu_indirect_function
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cmpl $0, KIND_OFFSET+__cpu_features(%rip)
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jne 1f
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call __init_cpu_features
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1: testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
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jnz 2f
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leaq __memcmp_sse2(%rip), %rax
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ret
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2: testl $bit_SSE4_1, __cpu_features+CPUID_OFFSET+index_SSE4_1(%rip)
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jz 3f
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leaq __memcmp_sse4_1(%rip), %rax
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ret
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3: leaq __memcmp_ssse3(%rip), %rax
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ret
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END(memcmp)
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# undef ENTRY
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# define ENTRY(name) \
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.type __memcmp_sse2, @function; \
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.p2align 4; \
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.globl __memcmp_sse2; \
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.hidden __memcmp_sse2; \
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__memcmp_sse2: cfi_startproc; \
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CALL_MCOUNT
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# undef END
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# define END(name) \
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cfi_endproc; .size __memcmp_sse2, .-__memcmp_sse2
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# ifdef SHARED
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# undef libc_hidden_builtin_def
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/* IFUNC doesn't work with the hidden functions in shared library since
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they will be called without setting up EBX needed for PLT which is
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used by IFUNC. */
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# define libc_hidden_builtin_def(name) \
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.globl __GI_memcmp; __GI_memcmp = __memcmp_sse2
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# endif
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#endif
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#include "../memcmp.S"
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