Attempting to decode: 0f 3a 0f ff ff 
iclass PALIGNR	category MMX	ISA-extension SSSE3	ISA-set SSSE3MMX
instruction-length 5
operand-width 32
effective-operand-width 32
effective-address-width 32
stack-address-width 32
iform-enum-name PALIGNR_MMXq_MMXq_IMMb
iform-enum-name-dispatch (zero based) 1
iclass-max-iform-dispatch 4
Nominal opcode position 2
Nominal opcode 0x0f
Operands
#   TYPE               DETAILS        VIS  RW       OC2 BITS BYTES NELEM ELEMSZ   ELEMTYPE   REGCLASS
#   ====               =======        ===  ==       === ==== ===== ===== ======   ========   ========
0   REG0              REG0=MM7   EXPLICIT  RW         Q   64     8     1     64        INT        MMX
1   REG1              REG1=MM7   EXPLICIT   R         Q   64     8     1     64        INT        MMX
2   IMM0              0xff(8b)   EXPLICIT   R         B    8     1     1      8       UINT    INVALID
Memory Operands
  MemopBytes = 0
ATTRIBUTES: NOTSX 
EXCEPTION TYPE: MMX_MEM
ISA SET: [SSSE3MMX]
0	CPUID GROUP NAME: [SSSE3MMX]
	0	CPUID RECORD NAME: [SSSE3]
		{Leaf 0x00000001, subleaf 0x00000000, ECX[9:9]} = 1
	1	CPUID RECORD NAME: [MMX]
		{Leaf 0x00000001, subleaf 0x00000000, EDX[23:23]} = 1