mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 05:20:06 +00:00
52cf11004e
Implemented:
wcscat-avx2 (+ 744 bytes
wcscpy-avx2 (+ 539 bytes)
wcpcpy-avx2 (+ 577 bytes)
wcsncpy-avx2 (+1108 bytes)
wcpncpy-avx2 (+1214 bytes)
wcsncat-avx2 (+1085 bytes)
Performance Changes:
Times are from N = 10 runs of the benchmark suite and are reported
as geometric mean of all ratios of New Implementation / Best Old
Implementation. Best Old Implementation was determined with the
highest ISA implementation.
wcscat-avx2 -> 0.975
wcscpy-avx2 -> 0.591
wcpcpy-avx2 -> 0.698
wcsncpy-avx2 -> 0.730
wcpncpy-avx2 -> 0.711
wcsncat-avx2 -> 0.954
Code Size Changes:
This change increase the size of libc.so by ~5.5kb bytes. For
reference the patch optimizing the normal strcpy family functions
decreases libc.so by ~5.2kb.
Full check passes on x86-64 and build succeeds for all ISA levels w/
and w/o multiarch.
67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/* Multiple versions of wcscpy.
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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 __wcscpy __redirect_wcscpy
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# include <wchar.h>
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# undef __wcscpy
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# define SYMBOL_NAME wcscpy
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# include <init-arch.h>
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extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (generic) attribute_hidden;
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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 (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
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&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
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&& X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load, ))
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{
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if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
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&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
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return OPTIMIZE (evex);
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if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER, !))
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return OPTIMIZE (avx2);
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}
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if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, SSSE3))
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return OPTIMIZE (ssse3);
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return OPTIMIZE (generic);
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}
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libc_ifunc_redirected (__redirect_wcscpy, __wcscpy, IFUNC_SELECTOR ());
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weak_alias (__wcscpy, wcscpy)
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# ifdef SHARED
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__hidden_ver1 (__wcscpy, __GI___wcscpy, __redirect_wcscpy)
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__attribute__((visibility ("hidden"))) __attribute_copy__ (wcscpy);
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# endif
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#endif
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