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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-07-26 11:10:08 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-07-26 11:10:44 -0700 |
| commit | 65d87ade1ee6f3ac099105e3511bd09bdc24cf3f (patch) | |
| tree | 4a4a37507e6e33c4484f5a2f53883bc5052c927f | |
| parent | c9dc4d5117afea7283d5fd80c80be8cc09cde84d (diff) | |
| download | glibc-65d87ade1ee6f3ac099105e3511bd09bdc24cf3f.zip glibc-65d87ade1ee6f3ac099105e3511bd09bdc24cf3f.tar.gz glibc-65d87ade1ee6f3ac099105e3511bd09bdc24cf3f.tar.bz2 | |
x86: Correct index_cpu_LZCNT [BZ # 23456]
cpu-features.h has
#define bit_cpu_LZCNT (1 << 5)
#define index_cpu_LZCNT COMMON_CPUID_INDEX_1
#define reg_LZCNT
But the LZCNT feature bit is in COMMON_CPUID_INDEX_80000001:
Initial EAX Value: 80000001H
ECX Extended Processor Signature and Feature Bits:
Bit 05: LZCNT available
index_cpu_LZCNT should be COMMON_CPUID_INDEX_80000001, not
COMMON_CPUID_INDEX_1. The VMX feature bit is in COMMON_CPUID_INDEX_1:
Initial EAX Value: 01H
Feature Information Returned in the ECX Register:
5 VMX
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
[BZ # 23456]
* sysdeps/x86/cpu-features.h (index_cpu_LZCNT): Set to
COMMON_CPUID_INDEX_80000001.
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.h | 2 |
2 files changed, 7 insertions, 1 deletions
@@ -1,3 +1,9 @@ +2018-07-26 H.J. Lu <hongjiu.lu@intel.com> + + [BZ # 23456] + * sysdeps/x86/cpu-features.h (index_cpu_LZCNT): Set to + COMMON_CPUID_INDEX_80000001. + 2018-07-26 Stefan Liebler <stli@linux.ibm.com> * string/tst-xbzero-opt.c (use_test_buffer): New function. diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index 624e681..3807a9d 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -204,7 +204,7 @@ extern const struct cpu_features *__get_cpu_features (void) # define index_cpu_HTT COMMON_CPUID_INDEX_1 # define index_cpu_BMI1 COMMON_CPUID_INDEX_7 # define index_cpu_BMI2 COMMON_CPUID_INDEX_7 -# define index_cpu_LZCNT COMMON_CPUID_INDEX_1 +# define index_cpu_LZCNT COMMON_CPUID_INDEX_80000001 # define index_cpu_MOVBE COMMON_CPUID_INDEX_1 # define index_cpu_POPCNT COMMON_CPUID_INDEX_1 # define index_cpu_IBT COMMON_CPUID_INDEX_7 |