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opcode encoding mode32 mode64 cpuid tags rw_actions multisize datasize
NOP 90+rd V V operand32,operand64 Y
NOP 90+rw V V operand16,operand64 Y
NOP F3 90+rd V V operand32 Y
NOP F3 90+rw V V operand16 Y
NOP r/m32 0F 18 /4 V V operand32 r Y 32
NOP r/m32 0F 18 /5 V V operand32 r Y 32
NOP r/m32 0F 18 /6 V V operand32 r Y 32
NOP r/m32 0F 18 /7 V V operand32 r Y 32
NOP r/m32, r32 0F 19 /r V V operand32 r,r Y 32