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Fixed issue #76: Skylake Core i5 badly recognized

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Add support for detecting RDSEED and ADX instructions.
Use RDSEED instead of RTM to ascertain that the CPU is
Broadwell or later in recog_intel.c. This fixes
detection discrepancies on Linux, where RTM is not
made available (I guess there's no kernel support for it).

The two new flags are also now detected in the Broadwell
and Skylake tests. Update them as well.
This commit is contained in:
Veselin Georgiev 2016-10-24 18:16:15 +03:00
commit e36a08deb9
5 changed files with 9 additions and 3 deletions
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2
libcpuid/cpuid_main.c
View file

@ -645,6 +645,8 @@ const char* cpu_feature_str(cpu_feature_t feature)
{ CPU_FEATURE_AVX512BW, "avx512bw" },
{ CPU_FEATURE_AVX512VL, "avx512vl" },
{ CPU_FEATURE_SGX, "sgx" },
{ CPU_FEATURE_RDSEED, "rdseed" },
{ CPU_FEATURE_ADX, "adx" },
};
unsigned i, n = COUNT_OF(matchtable);
if (n != NUM_CPU_FEATURES) {

2
libcpuid/libcpuid.h
View file

@ -484,6 +484,8 @@ typedef enum {
CPU_FEATURE_AVX512BW, /*!< AVX-512 Byte/Word granular insns */
CPU_FEATURE_AVX512VL, /*!< AVX-512 128/256 vector length extensions */
CPU_FEATURE_SGX, /*!< SGX extensions. Non-autoritative, check cpu_id_t::sgx::present to verify presence */
CPU_FEATURE_RDSEED, /*!< RDSEED instruction */
CPU_FEATURE_ADX, /*!< ADX extensions (arbitrary precision) */
/* termination: */
NUM_CPU_FEATURES,
} cpu_feature_t;

4
libcpuid/recog_intel.c
View file

@ -354,6 +354,8 @@ static void load_intel_features(struct cpu_raw_data_t* raw, struct cpu_id_t* dat
{ 11, CPU_FEATURE_RTM },
{ 16, CPU_FEATURE_AVX512F },
{ 17, CPU_FEATURE_AVX512DQ },
{ 18, CPU_FEATURE_RDSEED },
{ 19, CPU_FEATURE_ADX },
{ 26, CPU_FEATURE_AVX512PF },
{ 27, CPU_FEATURE_AVX512ER },
{ 28, CPU_FEATURE_AVX512CD },
@ -648,7 +650,7 @@ static intel_code_t get_brand_code(struct cpu_id_t* data)
if (data->flags[CPU_FEATURE_FMA3])
core_ix_base = CORE_HASWELL3;
/* if it has RTM, then it is at least a Broadwell-E or Skylake */
if (data->flags[CPU_FEATURE_RTM])
if (data->flags[CPU_FEATURE_RDSEED])
core_ix_base = CORE_BROADWELL3;
switch (bs[i + 9]) {