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GNU C Library master sources branch hjl/xgetbv/2.25 created. glibc-2.25-27-gc483f2e
- From: hjl at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 29 Jul 2017 12:57:40 -0000
- Subject: GNU C Library master sources branch hjl/xgetbv/2.25 created. glibc-2.25-27-gc483f2e
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The branch, hjl/xgetbv/2.25 has been created
at c483f2eaf392ea34dbc90e91d71a5a597fd33952 (commit)
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=c483f2eaf392ea34dbc90e91d71a5a597fd33952
commit c483f2eaf392ea34dbc90e91d71a5a597fd33952
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Fri Jul 28 15:13:40 2017 -0700
x86-64: Use _dl_runtime_resolve_opt only with AVX512F
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 9afd74c..cb3d048 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -235,10 +235,13 @@ init_cpu_features (struct cpu_features *cpu_features)
|= bit_arch_Prefer_No_AVX512;
/* To avoid SSE transition penalty, use _dl_runtime_resolve_slow.
- If XGETBV suports ECX == 1, use _dl_runtime_resolve_opt. */
+ If XGETBV suports ECX == 1, use _dl_runtime_resolve_opt.
+ Use _dl_runtime_resolve_opt only with AVX512F since it is
+ slower than _dl_runtime_resolve_slow with AVX2. */
cpu_features->feature[index_arch_Use_dl_runtime_resolve_slow]
|= bit_arch_Use_dl_runtime_resolve_slow;
- if (cpu_features->max_cpuid >= 0xd)
+ if (CPU_FEATURES_ARCH_P (cpu_features, AVX512F_Usable)
+ && cpu_features->max_cpuid >= 0xd)
{
unsigned int eax;
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