Method and apparatus for efficient, low-latency, streaming memory copies

摘要

Systems, methods, and apparatus with improved techniques for copying data from a source memory location to a destination memory location are disclosed. An exemplary method includes receiving a source address that indicates the source memory location, a destination address that indicates the destination memory location, and receiving a size indicator that indicates the size of the data. When the size is less than a threshold size, a particular pointer in a jump table is accessed, based upon the size that points to particular load and store instructions. The jump table includes a plurality of pointers that point to a corresponding one of a plurality of load and store instructions. The particular load-store instructions are then executed with a processor of the computing device to copy the data from the source memory location to the destination memory location. Several other efficiency-improvement aspects are also disclosed that may be used in connection with these steps to further improve copy efficiencies.

主权项

1. A method for copying data from a source memory location to a destination memory location on a computing device, the method comprising:
receiving a source address indicating the source memory location; receiving a destination address indicating the destination memory location; receiving a size indicator indicating a copy size of the data; accessing, when the copy size is less than a threshold size, a particular pointer in a jump table that points to particular load and store instructions based upon the copy size of the data, the jump table including a plurality of pointers, each of the plurality of pointers pointing to a corresponding one of a plurality of load and store instructions; and executing the particular load-store instructions on the computing device to copy the data from the source memory location to the destination memory location.