diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/ifunc-memcmpeq.h')
-rw-r--r-- | sysdeps/x86_64/multiarch/ifunc-memcmpeq.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/ifunc-memcmpeq.h b/sysdeps/x86_64/multiarch/ifunc-memcmpeq.h new file mode 100644 index 0000000000..3319a9568a --- /dev/null +++ b/sysdeps/x86_64/multiarch/ifunc-memcmpeq.h @@ -0,0 +1,49 @@ +/* Common definition for __memcmpeq ifunc selections. + All versions must be listed in ifunc-impl-list.c. + Copyright (C) 2017-2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +# include <init-arch.h> + +extern __typeof (REDIRECT_NAME) OPTIMIZE1 (sse2) attribute_hidden; +extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2) attribute_hidden; +extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2_rtm) attribute_hidden; +extern __typeof (REDIRECT_NAME) OPTIMIZE1 (evex) attribute_hidden; + +static inline void * +IFUNC_SELECTOR (void) +{ + const struct cpu_features* cpu_features = __get_cpu_features (); + + if (CPU_FEATURE_USABLE_P (cpu_features, AVX2) + && CPU_FEATURE_USABLE_P (cpu_features, BMI2) + && CPU_FEATURE_USABLE_P (cpu_features, MOVBE) + && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load)) + { + if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL) + && CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)) + return OPTIMIZE1 (evex); + + if (CPU_FEATURE_USABLE_P (cpu_features, RTM)) + return OPTIMIZE1 (avx2_rtm); + + if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)) + return OPTIMIZE1 (avx2); + } + + return OPTIMIZE1 (sse2); +} |