diff options
Diffstat (limited to 'sysdeps/x86/cpu-features.c')
| -rw-r--r-- | sysdeps/x86/cpu-features.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index 33788ed323..ae7f844f8b 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -138,8 +138,6 @@ init_cpu_features (struct cpu_features *cpu_features) case 0x57: /* Knights Landing. Enable Silvermont optimizations. */ - cpu_features->feature[index_arch_Prefer_No_VZEROUPPER] - |= bit_arch_Prefer_No_VZEROUPPER; case 0x5c: case 0x5f: @@ -225,6 +223,12 @@ init_cpu_features (struct cpu_features *cpu_features) cpu_features->feature[index_arch_AVX_Fast_Unaligned_Load] |= bit_arch_AVX_Fast_Unaligned_Load; + /* Since AVX512ER is unique to Xeon Phi, set Prefer_No_VZEROUPPER + if AVX512ER is available. */ + if (CPU_FEATURES_CPU_P (cpu_features, AVX512ER)) + cpu_features->feature[index_arch_Prefer_No_VZEROUPPER] + |= bit_arch_Prefer_No_VZEROUPPER; + /* To avoid SSE transition penalty, use _dl_runtime_resolve_slow. If XGETBV suports ECX == 1, use _dl_runtime_resolve_opt. */ cpu_features->feature[index_arch_Use_dl_runtime_resolve_slow] |