Optimization Circuitry for Predicted Operand Value Processing
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Solution Overview
Problem
Current data processing systems face performance limitations due to the need to wait for source operand values to become available before executing instructions, which can be improved through value prediction but still require actual execution to determine result values, leading to resource bottlenecks and power consumption issues.
Innovation Solution
Incorporating optimization circuitry that detects an optimization condition based on predicted source operand values, allowing the system to determine result values without executing the instruction, thereby freeing resources and reducing power consumption, and enabling earlier execution of dependent instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If value prediction circuitry is used to produce predicted source operand values, then instruction execution can proceed earlier improving performance, but the system still requires actual execution to determine result values causing resource bottlenecks
Solution Approach 1:
The optimization circuitry performs preliminary analysis of the predicted source operand value before actual instruction execution. When the predicted value indicates a known result (such as zero for multiplication), the system determines the result value in advance without requiring full execution, thereby resolving the contradiction between early execution and resource bottlenecks
Solution Approach 2:
The system creates a copy of the predicted source operand value and uses it for preliminary result determination. This allows the optimization circuitry to evaluate whether actual execution is necessary, enabling early result determination for certain operations while maintaining the option for full execution when needed
2Reliability
If instructions are executed to determine result values, then accurate results are obtained, but resource consumption and power usage increase
Solution Approach 1:
The system performs partial execution by analyzing only the necessary components to determine the result value. When the optimization condition is met (predicted source operand indicates known result), the system performs minimal analysis rather than full instruction execution, reducing power consumption while maintaining result accuracy
Solution Approach 2:
The optimization circuitry changes the operational parameters by evaluating the predicted source operand value to determine whether full execution is required. This parameter-based decision-making allows the system to switch between full execution and optimized result determination, balancing accuracy and power consumption
3Productivity
If the system waits for source operand values to be available before executing instructions, then resource bottlenecks are avoided, but performance and productivity decrease
Solution Approach 1:
The value prediction circuitry performs preliminary determination of source operand values before they are actually available from previous instructions. This allows the instruction to be dispatched to execution circuitry earlier, reducing waiting time and improving throughput while maintaining correctness through subsequent verification
Data Source
AI summary
An apparatus and method are provided for processing instructions. The apparatus has execution circuitry for executing instructions, where each instruction requires an associated operation to be performed using one or more source operand values in order to produce a result value. Issue circuitry is used to maintain a record of pending instructions awaiting execution by the execution circuitry, and prediction circuitry is used to produce a predicted source operand value for a chosen pending instruction. Optimisation circuitry is then arranged to detect an optimisation condition for the chosen pending instruction when the predicted source operand value is such that, having regard to the associated operation for the chosen pending instruction, the result value is known without performing the associated operation. In response to detection of the optimisation condition, an optimisation operation is implemented instead of causing the execution circuitry to perform the associated operation in order to execute the chosen pending instruction. This can lead to significant performance and/or power consumption improvements.