US 7,127,591 B2 · Instruction control device and method therefor

Abstract

The present invention relates to an instruction control device, and more particularly to an instruction control device which has achieved a high speed operational processing, such as a reduction in the amount of components, so as to enable an out-of-order instruction execution to thereby execute an instruction processing at high speed in an information processor. An instruction control device having instruction storing means for temporarily storing a plurality of decoded instructions yet unissued to an execution unit; wherein the storing means is constituted such that an arranged order of entries of the storing means indicates a decoded order of decoded instructions stored in the entries; wherein that entry, from which the decoded instruction stored therein has been issued, is deleted; wherein information stored in the entries is shifted among the entries such that the entries storing the unissued instructions constitute entries in a continuous order; and wherein a shifting amount between entries is, at the most, equal to the number of instructions which can be simultaneously decoded.

Claims8

Dependent claims

An instruction control device, comprising:

a reservation station having a flag indicating a STORE instruction;
a table indicating a usability of a source operand of an instruction stored in the reservation station;
and
an instruction issuance control unit, wherein the instruction issuance control unit performs an instruction issuance from the reservation station at a time when the table indicates that the source operand is useable;
and
wherein when said instruction issuance control unit has detected an issuance of the STORE instruction by the flag, the instruction issuance control unit renders a fetch request of a succeeding instruction to wait until an address calculation and a request of the STORE instruction are completed.

3 more elements

An instruction control method for an information processor having a reservation station having a flag indicating a STORE instruction for storing a plurality of decoded instructions, comprising:

detecting a STORE instruction based on the flag, upon issuance of an instruction from the reservation station;
and
rendering a fetch request, which is to be issued subsequent to the detected STORE instruction, to wait until an address calculation and a request of the STORE instruction are completed.

Dependencies are inferred from the claim text.

Instruction control device and method therefor

Life of this patent

Instruction control device and method therefor

Life of this patent

Abstract

Claims8