Attempting to decode: ff 18 
iclass CALL_FAR	category CALL	ISA-extension BASE	ISA-set I86
instruction-length 2
operand-width 32
effective-operand-width 32
effective-address-width 64
stack-address-width 64
iform-enum-name CALL_FAR_MEMp2
iform-enum-name-dispatch (zero based) 0
iclass-max-iform-dispatch 2
Nominal opcode position 0
Nominal opcode 0xff
Operands
#   TYPE               DETAILS        VIS  RW       OC2 BITS BYTES NELEM ELEMSZ   ELEMTYPE   REGCLASS
#   ====               =======        ===  ==       === ==== ===== ===== ======   ========   ========
0   MEM0           (see below)   EXPLICIT   R        P2   48     6     1     48     STRUCT    INVALID
1   REG0        REG0=STACKPUSH SUPPRESSED  RW      SPW2   64     8     1     64        INT     PSEUDO
2   REG1              REG1=RIP SUPPRESSED   W         Y   32     4     1     32        INT         IP
3   MEM1           (see below) SUPPRESSED   W      SPW2   64     8     1     64        INT    INVALID
4  BASE1             BASE1=RSP SUPPRESSED  RW       SSZ   64     8     1     64        INT        GPR
Memory Operands
  0    read BASE= RAX/GPR  ASZ0=64
  1 written BASE= RSP/GPR  ASZ1=64
  MemopBytes = 6
ATTRIBUTES: FAR_XFER FIXED_BASE1 INDIRECT_BRANCH NOTSX SCALABLE STACKPUSH1 
ISA SET: [I86]