Attempting to decode: 62 54 fc 0c f4 c0 
iclass TZCNT	category BMI1	ISA-extension APXEVEX	ISA-set APX_F
instruction-length 6
operand-width 64
effective-operand-width 64
effective-address-width 64
stack-address-width 64
iform-enum-name TZCNT_GPRv_GPRv_APX
iform-enum-name-dispatch (zero based) 1
iclass-max-iform-dispatch 4
Nominal opcode position 4
Nominal opcode 0xf4
Operands
#   TYPE               DETAILS        VIS  RW       OC2 BITS BYTES NELEM ELEMSZ   ELEMTYPE   REGCLASS
#   ====               =======        ===  ==       === ==== ===== ===== ======   ========   ========
0   REG0               REG0=R8   EXPLICIT   W         V   64     8     1     64        INT        GPR
1   REG1               REG1=R8   EXPLICIT   R         V   64     8     1     64        INT        GPR
Memory Operands
  MemopBytes = 0
ATTRIBUTES: APX_NF SCALABLE 
EXCEPTION TYPE: APX_EVEX_INT
[APX] No-Flags 
ISA SET: [APX_F]
0	CPUID GROUP NAME: [APX_F]
	0	CPUID RECORD NAME: [APX_F]
		{Leaf 0x00000007, subleaf 0x00000001, EDX[21:21]} = 1