X86_LZCNT_ID

#define X86_LZCNT_ID   0x0000000400000000llu

A bit mask used to request support of the Intel LZCNT instruction. To check availability of TZCNT, use the ... mask.

The mask is mapped to the following Intel x86 and x86-64 CPUID flag: CPUID.(EAX=80000001H):ECX.LZCNT[bit 5].

See also

x86_cpuid_test_feature;
get_x86_cpu_info.