diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2017-04-28 10:26:58 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-04-28 10:27:42 -0700 |
| commit | 5f85ab28690a94355a0eaf75206cdf237fe6009d (patch) | |
| tree | 8d9cba93d093169c5a639adc93537ff0edd0c4ac | |
| parent | b2e8c40afcb83f9a6dbbb543ce0951b6c890d350 (diff) | |
| download | glibc-5f85ab28690a94355a0eaf75206cdf237fe6009d.tar.gz glibc-5f85ab28690a94355a0eaf75206cdf237fe6009d.tar.xz glibc-5f85ab28690a94355a0eaf75206cdf237fe6009d.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. (cherry picked from commit 1c53cb49de6d82d9469ccbd5aa0c55924502bd8b)
| -rw-r--r-- | ChangeLog | 21 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.c | 8 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.h | 15 |
3 files changed, 42 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog index 13f809d26f..eecd2133c7 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,24 @@ +2017-04-28 H.J. Lu <hongjiu.lu@intel.com> + + * 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. + 2017-01-05 Joseph Myers <joseph@codesourcery.com> [BZ #21026] diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index 11b9af2231..8f8cfce5b6 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -133,8 +133,6 @@ 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: @@ -206,6 +204,12 @@ 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] diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index a8b5a734bd..265bc6c14d 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -62,6 +62,11 @@ #define bit_cpu_AVX2 (1 << 5) #define bit_cpu_AVX512F (1 << 16) #define bit_cpu_AVX512DQ (1 << 17) +#define bit_cpu_AVX512PF (1 << 26) +#define bit_cpu_AVX512ER (1 << 27) +#define bit_cpu_AVX512CD (1 << 28) +#define bit_cpu_AVX512BW (1 << 30) +#define bit_cpu_AVX512VL (1u << 31) /* XCR0 Feature flags. */ #define bit_XMM_state (1 << 1) @@ -236,6 +241,11 @@ extern const struct cpu_features *__get_cpu_features (void) # define index_cpu_AVX2 COMMON_CPUID_INDEX_7 # define index_cpu_AVX512F COMMON_CPUID_INDEX_7 # define index_cpu_AVX512DQ COMMON_CPUID_INDEX_7 +# define index_cpu_AVX512PF COMMON_CPUID_INDEX_7 +# define index_cpu_AVX512ER COMMON_CPUID_INDEX_7 +# define index_cpu_AVX512CD COMMON_CPUID_INDEX_7 +# define index_cpu_AVX512BW COMMON_CPUID_INDEX_7 +# define index_cpu_AVX512VL COMMON_CPUID_INDEX_7 # define index_cpu_ERMS COMMON_CPUID_INDEX_7 # define index_cpu_RTM COMMON_CPUID_INDEX_7 # define index_cpu_FMA COMMON_CPUID_INDEX_1 @@ -254,6 +264,11 @@ extern const struct cpu_features *__get_cpu_features (void) # define reg_AVX2 ebx # define reg_AVX512F ebx # define reg_AVX512DQ ebx +# define reg_AVX512PF ebx +# define reg_AVX512ER ebx +# define reg_AVX512CD ebx +# define reg_AVX512BW ebx +# define reg_AVX512VL ebx # define reg_ERMS ebx # define reg_RTM ebx # define reg_FMA ecx |