Cache processing request for data stored in stack area by using useless information, operating method of cache, and electronic device comprising cache

An operating method of a cache comprising a data memory including a stack area storing data in a stack structure, a tag memory, and a cache controller, the operating method comprising:

• receiving, by the cache controller, a pop request from a processor;
• and
• changing, by the cache controller, useless information in the tag memory for a cache line of the stack area storing data subject to the pop request, to a useless state,
• wherein the useless information indicates whether data stored in a corresponding cache line has been popped.

An electronic device comprising:

• a main memory;
• a cache;
• and
• a processor,
• wherein the cache includes:
• a data memory including a stack area storing, in a stack structure, data used by the processor in a plurality of cache lines;
• a tag memory for storing a tag entry including information about the data stored in the stack area;
• and
• a cache controller configured to process a request for the data stored in the stack area based on the tag entry,
• the tag entry includes useless information indicating whether data stored in a corresponding cache line has been popped, and
• the cache controller is further configured to, when a pop request for the data stored in the stack area is received, change the useless information of a cache line storing the data subject to the pop request, to a useless state.