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These functions all have optimized versions: __strncat_sse2_unaligned, __strncpy_sse2_unaligned, and stpncpy_sse2_unaligned which are faster than their respective generic implementations. Since the sse2 versions can run on baseline x86_64, we should use these as the baseline implementation and can remove the generic implementations. Geometric mean of N=20 runs of the entire benchmark suite on: 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz (Tigerlake) __strncat_sse2_unaligned / __strncat_generic: .944 __strncpy_sse2_unaligned / __strncpy_generic: .726 __stpncpy_sse2_unaligned / __stpncpy_generic: .650 Tested build with and without multiarch and full check with multiarch.
36 lines
1.3 KiB
C
36 lines
1.3 KiB
C
/* Multiple versions of strncpy.
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All versions must be listed in ifunc-impl-list.c.
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Copyright (C) 2017-2022 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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/* Define multiple versions only for the definition in libc. */
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#if IS_IN (libc)
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# define strncpy __redirect_strncpy
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# include <string.h>
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# undef strncpy
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# define SYMBOL_NAME strncpy
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# include "ifunc-strncpy.h"
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libc_ifunc_redirected (__redirect_strncpy, strncpy, IFUNC_SELECTOR ());
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# ifdef SHARED
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__hidden_ver1 (strncpy, __GI_strncpy, __redirect_strncpy)
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__attribute__ ((visibility ("hidden"))) __attribute_copy__ (strncpy);
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# endif
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#endif
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