diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch')
| -rw-r--r-- | sysdeps/x86_64/multiarch/ifunc-defines.sym | 3 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.c | 18 | ||||
| -rw-r--r-- | sysdeps/x86_64/multiarch/init-arch.h | 14 |
3 files changed, 34 insertions, 1 deletions
diff --git a/sysdeps/x86_64/multiarch/ifunc-defines.sym b/sysdeps/x86_64/multiarch/ifunc-defines.sym index e2021cdf87..eb1538abcc 100644 --- a/sysdeps/x86_64/multiarch/ifunc-defines.sym +++ b/sysdeps/x86_64/multiarch/ifunc-defines.sym @@ -13,5 +13,8 @@ CPUID_ECX_OFFSET offsetof (struct cpuid_registers, ecx) CPUID_EDX_OFFSET offsetof (struct cpuid_registers, edx) FAMILY_OFFSET offsetof (struct cpu_features, family) MODEL_OFFSET offsetof (struct cpu_features, model) +FEATURE_OFFSET offsetof (struct cpu_features, feature) +FEATURE_SIZE sizeof (unsigned int) COMMON_CPUID_INDEX_1 +FEATURE_INDEX_1 diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c index 7823aceb9b..50b2a38fbd 100644 --- a/sysdeps/x86_64/multiarch/init-arch.c +++ b/sysdeps/x86_64/multiarch/init-arch.c @@ -64,7 +64,23 @@ __init_cpu_features (void) __cpu_features.model += extended_model; } else if (__cpu_features.family == 0x06) - __cpu_features.model += extended_model; + { + __cpu_features.model += extended_model; + switch (__cpu_features.model) + { + case 0x1a: + case 0x1e: + case 0x1f: + case 0x25: + case 0x2e: + case 0x2f: + /* Rep string instructions are fast on Intel Core i3, i5 + and i7. */ + __cpu_features.feature[index_Fast_Rep_String] + |= bit_Fast_Rep_String; + break; + } + } } /* This spells out "AuthenticAMD". */ else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) diff --git a/sysdeps/x86_64/multiarch/init-arch.h b/sysdeps/x86_64/multiarch/init-arch.h index 0f8f77a8a1..69492cb3bf 100644 --- a/sysdeps/x86_64/multiarch/init-arch.h +++ b/sysdeps/x86_64/multiarch/init-arch.h @@ -16,6 +16,8 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ +#define bit_Fast_Rep_String (1 << 0) + #ifdef __ASSEMBLER__ #include <ifunc-defines.h> @@ -28,6 +30,8 @@ #define index_SSSE3 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET #define index_SSE4_2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET +#define index_Fast_Rep_String FEATURE_INDEX_1*FEATURE_SIZE + #else /* __ASSEMBLER__ */ #include <sys/param.h> @@ -39,6 +43,13 @@ enum COMMON_CPUID_INDEX_MAX }; +enum + { + FEATURE_INDEX_1 = 0, + /* Keep the following line at the end. */ + FEATURE_INDEX_MAX + }; + extern struct cpu_features { enum @@ -58,6 +69,7 @@ extern struct cpu_features } cpuid[COMMON_CPUID_INDEX_MAX]; unsigned int family; unsigned int model; + unsigned int feature[FEATURE_INDEX_MAX]; } __cpu_features attribute_hidden; @@ -86,4 +98,6 @@ extern const struct cpu_features *__get_cpu_features (void) #define HAS_SSE4_2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 20) #define HAS_FMA HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, 12) +#define index_Fast_Rep_String FEATURE_INDEX_1 + #endif /* __ASSEMBLER__ */ |