Attempting to decode: 66 9c 
iclass PUSHF	category PUSH	ISA-extension BASE	ISA-set I86
instruction-length 2
operand-width 16
effective-operand-width 16
effective-address-width 32
stack-address-width 32
iform-enum-name PUSHF
iform-enum-name-dispatch (zero based) 0
iclass-max-iform-dispatch 1
Nominal opcode position 1
Nominal opcode 0x9c
Operands
#   TYPE               DETAILS        VIS  RW       OC2 BITS BYTES NELEM ELEMSZ   ELEMTYPE   REGCLASS
#   ====               =======        ===  ==       === ==== ===== ===== ======   ========   ========
0   REG0        REG0=STACKPUSH SUPPRESSED  RW         W   16     2     1     16        INT     PSEUDO
1   MEM0           (see below) SUPPRESSED   W         W   16     2     1     16        INT    INVALID
2  BASE0             BASE0=ESP SUPPRESSED  RW       SSZ   32     4     1     32        INT        GPR
3   REG1           REG1=EFLAGS SUPPRESSED   R         Y   32     4     1     32        INT      FLAGS
Memory Operands
  0 written SEG= SS BASE= ESP/GPR  ASZ0=32
  MemopBytes = 2
FLAGS:
   reads-rflags id-tst vip-tst vif-tst ac-tst vm-tst rf-tst nt-tst iopl-tst iopl-tst of-tst df-tst if-tst tf-tst sf-tst zf-tst af-tst pf-tst cf-tst 
       read: of sf zf af pf cf df vif iopl if ac vm rf nt tf id vip  mask=0x3f7fd5
    written:                                mask=0x0
  undefined:                                mask=0x0
READS ZF
ATTRIBUTES: FIXED_BASE0 STACKPUSH0 
66-OSZ PREFIX
ANY 66 PREFIX
Number of legacy prefixes: 1 
ISA SET: [I86]