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e28e9b1ec4
Although the REP MOVSB implementations of memmove, memcpy and mempcpy aren't used by the current processors, this patch adds Prefer_FSRM check in ifunc-memmove.h so that they can be used in the future. * sysdeps/x86/cpu-features.h (bit_arch_Prefer_FSRM): New. (index_arch_Prefer_FSRM): Likewise. * sysdeps/x86/cpu-tunables.c (TUNABLE_CALLBACK (set_hwcaps)): Also check Prefer_FSRM. * sysdeps/x86_64/multiarch/ifunc-memmove.h (IFUNC_SELECTOR): Also return OPTIMIZE (erms) for Prefer_FSRM.
82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
/* Common definition for memcpy, mempcpy and memmove implementation.
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All versions must be listed in ifunc-impl-list.c.
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Copyright (C) 2017-2018 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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<http://www.gnu.org/licenses/>. */
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#include <init-arch.h>
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extern __typeof (REDIRECT_NAME) OPTIMIZE (erms) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned)
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attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned_erms)
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attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3_back) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx_unaligned) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx_unaligned_erms)
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attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned)
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attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned_erms)
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attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_no_vzeroupper)
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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_FEATURES_ARCH_P (cpu_features, Prefer_ERMS)
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|| CPU_FEATURES_ARCH_P (cpu_features, Prefer_FSRM))
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return OPTIMIZE (erms);
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if (CPU_FEATURES_ARCH_P (cpu_features, AVX512F_Usable)
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&& !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
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{
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if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
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return OPTIMIZE (avx512_no_vzeroupper);
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if (CPU_FEATURES_CPU_P (cpu_features, ERMS))
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return OPTIMIZE (avx512_unaligned_erms);
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return OPTIMIZE (avx512_unaligned);
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}
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if (CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
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{
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if (CPU_FEATURES_CPU_P (cpu_features, ERMS))
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return OPTIMIZE (avx_unaligned_erms);
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return OPTIMIZE (avx_unaligned);
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}
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if (!CPU_FEATURES_CPU_P (cpu_features, SSSE3)
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|| CPU_FEATURES_ARCH_P (cpu_features, Fast_Unaligned_Copy))
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{
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if (CPU_FEATURES_CPU_P (cpu_features, ERMS))
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return OPTIMIZE (sse2_unaligned_erms);
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return OPTIMIZE (sse2_unaligned);
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}
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if (CPU_FEATURES_ARCH_P (cpu_features, Fast_Copy_Backward))
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return OPTIMIZE (ssse3_back);
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return OPTIMIZE (ssse3);
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}
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