Bypassing a higher level register file in a processor having a multi-level register file and a set of bypass registers

An apparatus comprising:

• a set of one or more bypass registers;
• and
• a register file bypass controller in communication with the set of one or more bypass registers, the register file bypass controller configured to:
• receive a register file bypass request;
• determine whether to grant the register file bypass request;
• determine whether data identified by the register file bypass request is present in the set of one or more bypass registers in response to determining to grant the register file bypass request;
• determine a selected bypass register in the set of one or more bypass registers in response to determining the data identified by the register file bypass request is not present in the set of one or more bypass registers;
• determine to store the data identified by the register file bypass request in the selected bypass register;
• and
• notify an execution unit to cancel instruction execution associated with the data identified by the register file bypass request.

A computer program product for utilizing a register file bypass, the computer program product comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to:

• receive a register file bypass request;
• determine whether to grant the register file bypass request;
• determine whether data identified by the register file bypass request is present in a set of one or more bypass registers in response to determining to grant the register file bypass request;
• determine a selected bypass register in the set of one or more bypass registers in response to determining the data identified by the register file bypass request is not present in the set of one or more bypass registers;
• determine to store the data identified by the register file bypass request in the selected bypass register;
• and
• notify an execution unit to cancel instruction execution associated with the data identified by the register file bypass request.