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| author | Ulrich Drepper <drepper@redhat.com> | 2009-07-23 14:03:53 -0700 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2009-07-23 14:03:53 -0700 |
| commit | b2509a1e380bc92ee6ae6437103d349e1f517773 (patch) | |
| tree | b6219350d9668259cd970e8cbbdf65a89fa20e50 /sysdeps/x86_64 | |
| parent | 3e9099b4f6666cd05b62d2829f65161daddb151b (diff) | |
| download | glibc-b2509a1e380bc92ee6ae6437103d349e1f517773.zip glibc-b2509a1e380bc92ee6ae6437103d349e1f517773.tar.gz glibc-b2509a1e380bc92ee6ae6437103d349e1f517773.tar.bz2 | |
Avoid cpuid instructions in cache info discovery.
When multiarch is enabled we have this information stored. Use it.
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/cacheinfo.c | 50 |
1 files changed, 31 insertions, 19 deletions
diff --git a/sysdeps/x86_64/cacheinfo.c b/sysdeps/x86_64/cacheinfo.c index 0793909..75b8195 100644 --- a/sysdeps/x86_64/cacheinfo.c +++ b/sysdeps/x86_64/cacheinfo.c @@ -25,6 +25,17 @@ #ifdef USE_MULTIARCH # include "multiarch/init-arch.h" + +# define is_intel __cpu_features.kind == arch_kind_intel +# define is_amd __cpu_features.kind == arch_kind_amd +# define max_cpuid __cpu_features.max_cpuid +#else + /* This spells out "GenuineIntel". */ +# define is_intel \ + ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69 + /* This spells out "AuthenticAMD". */ +# define is_amd \ + ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65 #endif static const struct intel_02_cache_info @@ -155,6 +166,12 @@ intel_check_word (int name, unsigned int value, bool *has_level_2, /* Intel reused this value. For family 15, model 6 it specifies the 3rd level cache. Otherwise the 2nd level cache. */ + unsigned int family; + unsigned int model; +#ifdef USE_MULTIARCH + family = __cpu_features.family; + model = __cpu_features.model; +#else unsigned int eax; unsigned int ebx; unsigned int ecx; @@ -163,9 +180,10 @@ intel_check_word (int name, unsigned int value, bool *has_level_2, : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "0" (1)); - unsigned int family = ((eax >> 20) & 0xff) + ((eax >> 8) & 0xf); - unsigned int model = ((((eax >>16) & 0xf) << 4) - + ((eax >> 4) & 0xf)); + family = ((eax >> 20) & 0xff) + ((eax >> 8) & 0xf); + model = (((eax >>16) & 0xf) << 4) + ((eax >> 4) & 0xf); +#endif + if (family == 15 && model == 6) { /* The level 3 cache is encoded for this model like @@ -397,21 +415,24 @@ long int attribute_hidden __cache_sysconf (int name) { +#ifdef USE_MULTIARCH + if (__cpu_features.kind == arch_kind_unknown) + __init_cpu_features (); +#else /* Find out what brand of processor. */ - unsigned int eax; + unsigned int max_cpuid; unsigned int ebx; unsigned int ecx; unsigned int edx; asm volatile ("cpuid" - : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) + : "=a" (max_cpuid), "=b" (ebx), "=c" (ecx), "=d" (edx) : "0" (0)); +#endif - /* This spells out "GenuineIntel". */ - if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69) - return handle_intel (name, eax); + if (is_intel) + return handle_intel (name, max_cpuid); - /* This spells out "AuthenticAMD". */ - if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65) + if (is_amd) return handle_amd (name); // XXX Fill in more vendors. @@ -460,20 +481,11 @@ init_cacheinfo (void) #ifdef USE_MULTIARCH if (__cpu_features.kind == arch_kind_unknown) __init_cpu_features (); -# define is_intel __cpu_features.kind == arch_kind_intel -# define is_amd __cpu_features.kind == arch_kind_amd -# define max_cpuid __cpu_features.max_cpuid #else int max_cpuid; asm volatile ("cpuid" : "=a" (max_cpuid), "=b" (ebx), "=c" (ecx), "=d" (edx) : "0" (0)); - /* This spells out "GenuineIntel". */ -# define is_intel \ - ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69 - /* This spells out "AuthenticAMD". */ -# define is_amd \ - ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65 #endif if (is_intel) |