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The Register - to - Register (RR) instructions

  • A.have both their operands in the main store.
  • B.which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, except in the case of store operation when it is also written into the specified storage location.
  • C.which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
  • D.all of the above

Answer: C

Correct answer: which perform indicated operations on two fast registers of the machine

Register-to-register instructions take both operands from the processor’s own registers and leave the result in a register, so no memory access is needed and they are the fastest form. Storage-to-storage instructions work entirely in main memory, and register-to-storage instructions combine the two.

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