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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-04-18 08:27:22 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-04-18 08:27:32 -0700 |
| commit | 1c53cb49de6d82d9469ccbd5aa0c55924502bd8b (patch) | |
| tree | 6af724b3aa088cd29e6ad0b32e7249b1a7b8e62a /sysdeps/x86/cpu-features.c | |
| parent | cef9b65376a044309f74b77860ccf3c48a4ae315 (diff) | |
| download | glibc-1c53cb49de6d82d9469ccbd5aa0c55924502bd8b.tar.gz glibc-1c53cb49de6d82d9469ccbd5aa0c55924502bd8b.tar.xz glibc-1c53cb49de6d82d9469ccbd5aa0c55924502bd8b.zip | |
x86: Set Prefer_No_VZEROUPPER if AVX512ER is available
AVX512ER won't be implemented in any Xeon processors and will be in all Xeon Phi processors. Don't check CPU model number when setting Prefer_No_VZEROUPPER for Xeon Phi. Instead, set Prefer_No_VZEROUPPER if AVX512ER is available. It works with current and future Xeon Phi and non-Xeon Phi processors. * sysdeps/x86/cpu-features.c (init_cpu_features): Set Prefer_No_VZEROUPPER if AVX512ER is available. * sysdeps/x86/cpu-features.h (bit_cpu_AVX512PF): New. (bit_cpu_AVX512ER): Likewise. (bit_cpu_AVX512CD): Likewise. (bit_cpu_AVX512BW): Likewise. (bit_cpu_AVX512VL): Likewise. (index_cpu_AVX512PF): Likewise. (index_cpu_AVX512ER): Likewise. (index_cpu_AVX512CD): Likewise. (index_cpu_AVX512BW): Likewise. (index_cpu_AVX512VL): Likewise. (reg_AVX512PF): Likewise. (reg_AVX512ER): Likewise. (reg_AVX512CD): Likewise. (reg_AVX512BW): Likewise. (reg_AVX512VL): Likewise.
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] |