67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
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/* Multiple versions of strstr.
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All versions must be listed in ifunc-impl-list.c.
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Copyright (C) 2012-2022 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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<https://www.gnu.org/licenses/>. */
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/* Redefine strstr 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 strstr
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#define strstr __redirect_strstr
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#include <string.h>
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#undef strstr
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#define STRSTR __strstr_generic
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#ifdef SHARED
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# undef libc_hidden_builtin_def
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# define libc_hidden_builtin_def(name) \
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__hidden_ver1 (__strstr_generic, __GI_strstr, __strstr_generic);
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#endif
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#include "string/strstr.c"
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extern __typeof (__redirect_strstr) __strstr_sse2_unaligned attribute_hidden;
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extern __typeof (__redirect_strstr) __strstr_generic attribute_hidden;
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extern __typeof (__redirect_strstr) __strstr_avx512 attribute_hidden;
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#include "init-arch.h"
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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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extern __typeof (__redirect_strstr) __libc_strstr;
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static inline void *
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IFUNC_SELECTOR (void)
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{
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const struct cpu_features *cpu_features = __get_cpu_features ();
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if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512DQ)
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&& CPU_FEATURE_USABLE_P (cpu_features, BMI2))
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return __strstr_avx512;
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if (CPU_FEATURES_ARCH_P (cpu_features, Fast_Unaligned_Load))
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return __strstr_sse2_unaligned;
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return __strstr_generic;
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}
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libc_ifunc_redirected (__redirect_strstr, __libc_strstr, IFUNC_SELECTOR ());
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#undef strstr
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strong_alias (__libc_strstr, strstr)
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