INSTRUCTIONS FOR PERFORMING AN OPERATION ON A OPERAND IN MEMORY AND SUBSEQUENTLY LOADING AN ORIGINAL VALUE OF SAID OPERAND IN A REGISTER

摘要

An arithmetic/logical instruction is executed having interlocked memory operands. when executed obtains a second operand from a location in memory, and saves a temporary copy of the second operand, the execution performs an arithmetic or logical operation based on the second operand and a third operand and stores the result in the memory location of the second operand, and subsequently stores the temporary copy in a first register.