forked from pool/glibc
f869647ca8
- math-c++-compat.patch: Do not use __builtin_types_compatible_p in C++ mode (BZ #21930) - Add iconvconfig to baselibs.conf (bsc#1051042) - resolv-context-leak.patch: Fix leaks of resolver contexts - dl-runtime-resolve-opt-avx512f.patch: Use _dl_runtime_resolve_opt only with AVX512F (BZ #21871) - libpthread-compat-wrappers.patch: Don't use IFUNC resolver for longjmp or system in libpthread (BZ #21041) OBS-URL: https://build.opensuse.org/request/show/519281 OBS-URL: https://build.opensuse.org/package/show/Base:System/glibc?expand=0&rev=472
27 lines
1.1 KiB
Diff
27 lines
1.1 KiB
Diff
2017-08-06 H.J. Lu <hongjiu.lu@intel.com>
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[BZ #21871]
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* sysdeps/x86/cpu-features.c (init_cpu_features): Set
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bit_arch_Use_dl_runtime_resolve_opt only with AVX512F.
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Index: glibc-2.26/sysdeps/x86/cpu-features.c
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===================================================================
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--- glibc-2.26.orig/sysdeps/x86/cpu-features.c
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+++ glibc-2.26/sysdeps/x86/cpu-features.c
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@@ -244,10 +244,13 @@ init_cpu_features (struct cpu_features *
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|= bit_arch_Prefer_No_AVX512;
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/* To avoid SSE transition penalty, use _dl_runtime_resolve_slow.
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- If XGETBV suports ECX == 1, use _dl_runtime_resolve_opt. */
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+ If XGETBV suports ECX == 1, use _dl_runtime_resolve_opt.
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+ Use _dl_runtime_resolve_opt only with AVX512F since it is
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+ slower than _dl_runtime_resolve_slow with AVX. */
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cpu_features->feature[index_arch_Use_dl_runtime_resolve_slow]
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|= bit_arch_Use_dl_runtime_resolve_slow;
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- if (cpu_features->max_cpuid >= 0xd)
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+ if (CPU_FEATURES_ARCH_P (cpu_features, AVX512F_Usable)
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+ && cpu_features->max_cpuid >= 0xd)
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{
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unsigned int eax;
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