]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/x86_64/multiarch/strncmp.c
1 /* Multiple versions of strncmp.
2 All versions must be listed in ifunc-impl-list.c.
3 Copyright (C) 2017-2019 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
20 /* Define multiple versions only for the definition in libc. */
22 # define strncmp __redirect_strncmp
26 # define SYMBOL_NAME strncmp
27 # include <init-arch.h>
29 extern __typeof (REDIRECT_NAME
) OPTIMIZE (sse2
) attribute_hidden
;
30 extern __typeof (REDIRECT_NAME
) OPTIMIZE (ssse3
) attribute_hidden
;
31 extern __typeof (REDIRECT_NAME
) OPTIMIZE (sse42
) attribute_hidden
;
32 extern __typeof (REDIRECT_NAME
) OPTIMIZE (avx2
) attribute_hidden
;
37 const struct cpu_features
* cpu_features
= __get_cpu_features ();
39 if (!CPU_FEATURES_ARCH_P (cpu_features
, Prefer_No_VZEROUPPER
)
40 && CPU_FEATURES_ARCH_P (cpu_features
, AVX2_Usable
)
41 && CPU_FEATURES_ARCH_P (cpu_features
, AVX_Fast_Unaligned_Load
))
42 return OPTIMIZE (avx2
);
44 if (CPU_FEATURES_CPU_P (cpu_features
, SSE4_2
)
45 && !CPU_FEATURES_ARCH_P (cpu_features
, Slow_SSE4_2
))
46 return OPTIMIZE (sse42
);
48 if (CPU_FEATURES_CPU_P (cpu_features
, SSSE3
))
49 return OPTIMIZE (ssse3
);
51 return OPTIMIZE (sse2
);
54 libc_ifunc_redirected (__redirect_strncmp
, strncmp
, IFUNC_SELECTOR ());
57 __hidden_ver1 (strncmp
, __GI_strncmp
, __redirect_strncmp
)
58 __attribute__ ((visibility ("hidden"))) __attribute_copy__ (strncmp
);