Resource Index Replacement for Processor Speculative Execution
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Solution Overview
Problem
Conventional processor systems waste resources by allocating resource indexes too early in the instruction scheduling process, leading to reduced resource utilization efficiency and increased costs due to unnecessary resource allocation for speculative execution.
Innovation Solution
A device and method for implementing resource index replacement, where a resource allocating unit allocates a first type resource index when an instruction enters the scheduling unit and replaces it with a second type resource index only when the instruction is executed, allowing efficient storage of execution results in a result storing unit, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource indexes are allocated early in the instruction scheduling process, then speculative execution efficiency is improved, but resource utilization efficiency deteriorates and costs increase
Solution Approach 1:
The patent applies preliminary action by allocating a first type resource index to the instruction in the instruction scheduling unit before execution, enabling early speculative execution. However, it avoids premature allocation of second type resource indexes (which correspond to actual storage resources) until the instruction is actually executed and a target operand index is determined, thus balancing speculative execution efficiency with resource utilization efficiency.
2Ease of operation
If resource indexes are allocated early, then instruction scheduling is simplified, but resource demand increases and costs rise
Solution Approach 1:
The patent segments the resource index allocation process into two distinct phases: (1) allocation of first type resource indexes in the instruction scheduling unit for simplified scheduling, and (2) allocation of second type resource indexes in the instruction executing unit based on actual execution needs. This segmentation allows the system to maintain scheduling simplicity while avoiding unnecessary resource demand.
3Speed
If more resources are allocated for speculative execution, then execution speed is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamic resource index replacement where the first type resource index allocated during scheduling is replaced by a second type resource index during execution based on the actual target operand index. This dynamic approach allows the system to allocate resources aggressively for speculative execution speed while ensuring that actual storage resources are only consumed when needed, thus maintaining high execution speed without sacrificing resource utilization efficiency.
Data Source
AI summary
Embodiments of the present disclosure provides a device for implementing resource index replacement, comprising an instruction scheduling unit configured to receive a first type, resource index from a resource allocating unit and then issue an instruction to an instruction executing unit for execution, to receive a second type resource index from the resource allocating unit, to execute the instruction from the instruction scheduling unit, and to issue a result of the instruction execution and the second type resource index to a result storing unit. The result storing unit comprises a plurality of resource for storing instruction execution results and execution results. The result storing unit is configured to allocate the first type resource index to an instruction entering the instruction scheduling unit and to allocate the second type resource index to an instruction entering the instruction execution unit. The present disclosure also provides a processor comprising the above device for implementing resource index replacement. In addition, the present disclosure provides a method for implementing resource index replacement.