NOP

In computer science, a NOP or NOOP (short for No Operation) is an assembly language instruction, programming language statement, or computer protocol command that does nothing.

Machine instruction

Some computer instruction sets include an instruction whose explicit purpose is to not change the state of any of the programmer-accessible registers, status flags, or memory and which may require a specific number of clock cycles to execute. In other instruction sets, a NOP has to be simulated by executing an instruction having operands that cause the same effect (e.g., on the SPARC processor, the instruction sethi 0, %g0 is the recommended solution).

A NOP is most commonly used for timing purposes, to force memory alignment, to prevent hazards, to occupy a branch delay slot, to render void an existing instruction such as a jump, or as a place-holder to be replaced by active instructions later on in program development (or to replace removed instructions when refactoring would be problematic or time-consuming). In some cases, a NOP can have minor side effects; for example, on the Motorola 68000 series of processors, the NOP opcode causes a synchronization of the pipeline.

NOP (disambiguation)

NOP is an assembly language instruction etc. that effectively does nothing at all.

NOP or N.O.P. may also refer to:

  • New Orleans Pelicans, an NBA team
  • National Revival of Poland (Narodowe Odrodzenie Polski), a nationalistic Polish political party
  • National Organic Program, an American organic food certification program
  • New Orleans Protocol, a 2004 agreement among white supremacist and neo-Nazi groups
  • Nociceptin receptor, a neurotransmitter receptor in the opioid receptor family
  • Sinop Airport (NOP), an airport in Sinop, in the Black Sea Region of Turkey
  • North Point Station, a train station on the Hong Kong MTR Island Line
  • See also

  • Noop (disambiguation)
  • NOP58

    Nucleolar protein 58 is a protein that in humans is encoded by the NOP58 gene.

    References

    Further reading


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