Importance

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Abstract

An information processing apparatus based on a VLIW system which eliminates an idle execution part generated during execution and which uses execution parts efficiently to obtain a high parallel processing ability of instruction execution. The information processing apparatus simultaneously executes m of multiple threads of long instructions each made up of n of operational instructions. When it is desired to process 3 threads with 4 of the operational instructions as an example, the information processing apparatus includes 3 instruction decoders corresponding to the 3 threads, 4 instruction schedulers for the operational instructions, and 4 execution parts corresponding to the 4 operational instructions. The instruction decoders, which are operated independently of each other, include a circuit for resolving a resource competition relationship and a data dependent relationship and a circuit for controlling instruction issuance. Thus, even when a previous instruction is being executed, the subsequent instructions are issued to the respective instruction schedulers respectively independently when there is no resource competition relation and also no data dependent relationship. Each of the instruction schedulers performs scheduling operation over the operational instructions to be sent to the corresponding execution parts between the plurality of threads.

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First Claim