Attempting to decode: fd 
iclass STD	category FLAGOP	ISA-extension BASE	ISA-set I86
instruction-length 1
operand-width 32
effective-operand-width 32
effective-address-width 32
stack-address-width 32
iform-enum-name STD
iform-enum-name-dispatch (zero based) 0
iclass-max-iform-dispatch 1
Nominal opcode position 0
Nominal opcode 0xfd
Operands
#   TYPE               DETAILS        VIS  RW       OC2 BITS BYTES NELEM ELEMSZ   ELEMTYPE   REGCLASS
#   ====               =======        ===  ==       === ==== ===== ===== ======   ========   ========
0   REG0           REG0=EFLAGS SUPPRESSED   W         Y   32     4     1     32        INT      FLAGS
Memory Operands
  MemopBytes = 0
FLAGS:
  must-write-rflags df-1 
       read:                                mask=0x0
    written:                            df  mask=0x400
  undefined:                                mask=0x0
ATTRIBUTES: NOTSX_COND 
ISA SET: [I86]