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author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-07-13 16:33:01 -0700 |
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committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-07-16 03:07:59 -0700 |
commit | 49889fb256a7f9b894b2d16fea23de1ac25b65e2 (patch) | |
tree | 923f7a6a2eb94e4baf9141783b19df06ed9ee747 /sysdeps/x86_64/multiarch/ifunc-strncpy.h | |
parent | 192979ee351315b84ff4277d0985f26243717cd7 (diff) | |
download | glibc-49889fb256a7f9b894b2d16fea23de1ac25b65e2.tar.gz glibc-49889fb256a7f9b894b2d16fea23de1ac25b65e2.tar.xz glibc-49889fb256a7f9b894b2d16fea23de1ac25b65e2.zip |
x86: Add support to build st{p|r}{n}{cpy|cat} with explicit ISA level
1. Add default ISA level selection in non-multiarch/rtld implementations. 2. Add ISA level build guards to different implementations. - I.e strcpy-avx2.S which is ISA level 3 will only build if compiled ISA level <= 3. Otherwise there is no reason to include it as we will always use one of the ISA level 4 implementations (strcpy-evex.S). 3. Refactor the ifunc selector and ifunc implementation list to use the ISA level aware wrapper macros that allow functions below the compiled ISA level (with a guranteed replacement) to be skipped. Tested with and without multiarch on x86_64 for ISA levels: {generic, x86-64-v2, x86-64-v3, x86-64-v4} And m32 with and without multiarch.
Diffstat (limited to 'sysdeps/x86_64/multiarch/ifunc-strncpy.h')
-rw-r--r-- | sysdeps/x86_64/multiarch/ifunc-strncpy.h | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/sysdeps/x86_64/multiarch/ifunc-strncpy.h b/sysdeps/x86_64/multiarch/ifunc-strncpy.h index 323225af4d..5c1c46b885 100644 --- a/sysdeps/x86_64/multiarch/ifunc-strncpy.h +++ b/sysdeps/x86_64/multiarch/ifunc-strncpy.h @@ -19,28 +19,32 @@ #include <init-arch.h> -extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned) - attribute_hidden; +extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden; + extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden; -extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden; + +extern __typeof (REDIRECT_NAME) + OPTIMIZE (sse2_unaligned) attribute_hidden; static inline void * IFUNC_SELECTOR (void) { - const struct cpu_features* cpu_features = __get_cpu_features (); + const struct cpu_features *cpu_features = __get_cpu_features (); - if (CPU_FEATURE_USABLE_P (cpu_features, AVX2) - && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load)) + if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2) + && X86_ISA_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)) + if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL) + && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)) return OPTIMIZE (evex); if (CPU_FEATURE_USABLE_P (cpu_features, RTM)) return OPTIMIZE (avx2_rtm); - if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)) + if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, + Prefer_No_VZEROUPPER, !)) return OPTIMIZE (avx2); } |