US 10,310,988 B2 · Address translation for sending real address to memory subsystem in effective address based load-store unit

Abstract

Technical solutions are described for executing one or more out-of-order instructions by a processing unit. An example method includes executing, by a load-store unit (LSU), instructions from an out-of-order (OoO) window. The OoO execution includes determining an effective address being used by a load instruction from the OoO window. Further, the execution includes determining presence of the effective address in an effective address directory (EAD) by identifying an EAD entry in the EAD, the EAD entry maps the effective address with an index of a corresponding effective-real table (ERT) entry from an effective-real table (ERT). In response to the effective address being present in the EAD, the execution includes accessing the corresponding ERT entry of the effective address of the load instruction, the corresponding ERT entry including a real address for the effective address, and issuing the load instruction using the real address from the corresponding ERT entry.

Claims13

Dependent claims

A processing unit for executing one or more instructions, the processing unit comprising:

a load-store unit (LSU) for transferring data between memory and registers, the load-store unit configured to execute a plurality of instructions in an out-of-order (OoO) window, the execution comprises:
determining an effective address being used by a load instruction from the OoO window;
determining presence of the effective address in an effective address directory (EAD) by identifying an EAD entry in the EAD, the EAD entry maps the effective address with an index of a corresponding effective-real table (ERT) entry from an effective-real table (ERT);
and
in response to the effective address being present in the EAD:
accessing the corresponding ERT entry of the effective address of the load instruction, the corresponding ERT entry including a real address for the effective address;
and
issuing the load instruction using the real address from the corresponding ERT entry.

5 more elements

A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to perform operations comprising:

issuing, by a load-store unit (LSU), a plurality of instructions from an out-of-order (OoO) window, the issuing comprising:
determining an effective address being used by a load instruction from the OoO window;
determining presence of the effective address in an effective address directory (EAD) by identifying an EAD entry in the EAD, the EAD entry maps the effective address with an index of a corresponding effective-real table (ERT) entry from an effective-real table (ERT);
and
in response to the effective address being present in the EAD:
accessing the corresponding ERT entry of the effective address of the load instruction, the corresponding ERT entry including a real address for the effective address;
and
issuing the load instruction using the real address from the corresponding ERT entry.

5 more elements

Dependencies are inferred from the claim text.

Address translation for sending real address to memory subsystem in effective address based load-store unit

Life of this patent

Address translation for sending real address to memory subsystem in effective address based load-store unit

Life of this patent

Abstract

Claims13