Qualcomm Incorporated

Sandeep Suresh Navada

Rodney Wayne Smith

Anil Krishna

Thomas Andrew Sartorius

Raguram Damodaran

Michael Scott McIlvaine

Shivam Priyadarshi

Kenneth Alan Dockser

Niket Kumar Choudhary

Storing narrow produced values for instruction operands directly in a register map in an out-of-order processor (OoP) is provided. An OoP is provided that includes an instruction processing system. The instruction processing system includes a number of instruction processing stages configured to pipeline the processing and execution of instructions according to a dataflow execution. The instruction processing system also includes a register map table (RMT) configured to store address pointers mapping logical registers to physical registers in a physical register file (PRF) for storing produced data for use by consumer instructions without overwriting logical registers for later executed, out-of-order instructions. In certain aspects, the instruction processing system is configured to write back (i.e., store) narrow values produced by executed instructions directly into the RMT, as opposed to writing the narrow produced values into the PRF in a write back stage.

Storing narrow produced values for instruction operands directly in a register map in an out-of-order processor

A method and apparatus for allowing an out-of-order processor to reuse an in-use physical register is disclosed herein. The method and apparatus uses identifiers, such as tokens and/or other identifiers in a rename map table (RMT) and a physical register file (PRF), to indicate whether an instruction result is allowed or disallowed to be written into a physical register.

Method and apparatus for selective renaming in a microprocessor

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Raleigh, NC, United States of America

Sandeep Suresh Navada