0F1F8000000000
ICLASS:     NOP
CATEGORY:   WIDENOP
EXTENSION:  BASE
IFORM:      NOP_MEMv_0F1F
ISA_SET:    FAT_NOP
ATTRIBUTES: NOP SCALABLE 
SHORT:      nop dword ptr [eax]
Encodable! 0F1F8000000000
Identical re-encoding