Attempting to decode: 48 cf 
iclass IRETQ	category RET	ISA-extension LONGMODE	ISA-set LONGMODE
instruction-length 2
operand-width 64
effective-operand-width 64
effective-address-width 64
stack-address-width 64
iform-enum-name IRETQ
iform-enum-name-dispatch (zero based) 0
iclass-max-iform-dispatch 1
Nominal opcode position 1
Nominal opcode 0xcf
Operands
#   TYPE               DETAILS        VIS  RW       OC2 BITS BYTES NELEM ELEMSZ   ELEMTYPE   REGCLASS
#   ====               =======        ===  ==       === ==== ===== ===== ======   ========   ========
0   REG0         REG0=STACKPOP SUPPRESSED  RW      SPW5  320    40     1    320        INT     PSEUDO
1   REG1              REG1=RIP SUPPRESSED   W         Q   64     8     1     64        INT         IP
2   MEM0           (see below) SUPPRESSED   R      SPW5  320    40     1    320        INT    INVALID
3  BASE0             BASE0=RSP SUPPRESSED  RW       SSZ   64     8     1     64        INT        GPR
4   REG2           REG2=RFLAGS SUPPRESSED  RW         Y   64     8     1     64        INT      FLAGS
Memory Operands
  0    read BASE= RSP/GPR  ASZ0=64
  MemopBytes = 40
FLAGS:
   reads-rflags id-pop vip-pop vif-pop ac-pop vm-tst vm-pop rf-pop nt-tst nt-pop iopl-tst iopl-pop of-pop df-pop if-pop tf-pop sf-pop zf-pop af-pop pf-pop cf-pop 
       read:                    iopl vm nt  mask=0x27000
    written: of sf zf af pf cf df vif iopl if ac vm rf nt tf id vip  mask=0x3f7fd5
  undefined:                                mask=0x0
ATTRIBUTES: FIXED_BASE0 NOTSX SCALABLE STACKPOP0 
Number of legacy prefixes: 1 
ISA SET: [LONGMODE]
0	CPUID GROUP NAME: [LONGMODE]
	0	CPUID RECORD NAME: [INTEL64]
		{Leaf 0x80000001, subleaf 0x00000000, EDX[29:29]} = 1