Processor and information processing system for instructions that designate a circular buffer as an operand

An information processing system, comprising:

• a memory;
• a circular buffer configured to load specific data from the memory, wherein the circular buffer includes:
• a shift register that includes a plurality of shift selectors and a plurality of specific registers at a plurality of stages, wherein
• each specific register of the plurality of specific registers and each shift selector of the plurality of shift selectors correspond to a respective stage of the plurality of stages,
• a specific register of the plurality of specific registers is configured to output the specific data to a first shift selector of the plurality of shift selectors and a second shift selector of the plurality of shift selectors,
• the specific register and the first shift selector are in a first stage of the plurality of stages, and
• the second shift selector is in a second stage of the plurality of stages;
• and
• a circulation selector configured to one of input new data to the shift register or circulate the specific data;
• and
• an instruction executing part configured to execute an instruction that designates the circular buffer as an operand.