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7ebba91361
Since VZEROUPPER triggers RTM abort while VZEROALL won't, select AVX optimized string/memory functions with xtest jz 1f vzeroall ret 1: vzeroupper ret at function exit on processors with usable RTM, but without 256-bit EVEX instructions to avoid VZEROUPPER inside a transactionally executing RTM region.
53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
/* Common definition for wmemset/wmemset_chk ifunc selections.
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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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#include <init-arch.h>
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extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_rtm)
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attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned) 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, AVX512F)
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&& !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512)
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&& !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
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return OPTIMIZE (avx512_unaligned);
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if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL))
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return OPTIMIZE (evex_unaligned);
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if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
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return OPTIMIZE (avx2_unaligned_rtm);
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if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
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return OPTIMIZE (avx2_unaligned);
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}
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return OPTIMIZE (sse2_unaligned);
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}
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