Mips Tech Limited

Harit Modi

Wayne Yamamoto

Techniques for executing a load instruction in a processor are described. In one example, load instructions which are detected to have an offset (or displacement) of zero are sent directly to a data cache, bypassing the address generation stage thereby reducing pipeline length. Load instructions having a nonzero offset can be executed in an address generation stage as is conventional. To avoid conflicts between a current load instruction with zero offset and a previous load instruction with nonzero offset, the current instruction can be rescheduled or sent through a separate dedicated load pipe. An alternative technique permits a load instruction with zero offset to be issued one cycle earlier than it would need to be if it had a nonzero offset, thus reducing load latency.

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Harit Modi