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1fd8c163a8
Update ifunc-avx2.h, strchr.c, strcmp.c, strncmp.c and wcsnlen.c to select the function optimized with 256-bit EVEX instructions using YMM16-YMM31 registers to avoid RTM abort with usable AVX512VL, AVX512BW and BMI2 since VZEROUPPER isn't needed at function exit. For strcmp/strncmp, prefer AVX2 strcmp/strncmp if Prefer_AVX2_STRCMP is set.
60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
/* Multiple versions of wcsnlen.
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All versions must be listed in ifunc-impl-list.c.
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Copyright (C) 2017-2021 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 __wcsnlen __redirect_wcsnlen
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# include <wchar.h>
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# undef __wcsnlen
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# define SYMBOL_NAME wcsnlen
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# include <init-arch.h>
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extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (sse4_1) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) 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 (CPU_FEATURE_USABLE_P (cpu_features, AVX2)
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&& CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
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{
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if (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, BMI2))
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return OPTIMIZE (evex);
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if (!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 (CPU_FEATURE_USABLE_P (cpu_features, SSE4_1))
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return OPTIMIZE (sse4_1);
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return OPTIMIZE (sse2);
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}
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libc_ifunc_redirected (__redirect_wcsnlen, __wcsnlen, IFUNC_SELECTOR ());
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weak_alias (__wcsnlen, wcsnlen);
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#endif
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