IA32_FEATURE_APERFMPERF
if (!x86_check_feature(IA32_FEATURE_APERFMPERF, FEATURE_6_ECX))
if (x86_check_feature(IA32_FEATURE_APERFMPERF, FEATURE_6_ECX)) {
if (cpu->arch.feature[FEATURE_6_ECX] & IA32_FEATURE_APERFMPERF)
if (x86_check_feature(IA32_FEATURE_APERFMPERF, FEATURE_6_ECX))