Lane-Specific Vector Mask Buffers for Fewer Register File Read Ports
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Solution Overview
Problem
Existing vector processing pipelines face inefficiencies due to hardware requirements for main vector register files, particularly in terms of read ports, which can lead to increased area costs and slower execution times, especially in out-of-order execution with register renaming.
Innovation Solution
Implementing separate vector mask buffers that store vector mask information close to functional processing units, reducing the need for read ports from the main vector register file and allowing for caching of mask values, thereby optimizing data flow and computation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vector mask information is stored in the main vector register file, then data availability is ensured, but the number of read ports required increases and execution time increases
Solution Approach 1:
The patent divides the vector mask storage function into two separate components: the main vector register file for operand data and separate vector mask buffers for mask information. Each lane has its own vector mask buffer that stores mask data locally, eliminating the need for additional read ports in the main register file and reducing execution time by avoiding sequential access delays.
2Reliability
If vector mask information is stored in the main vector register file, then data availability is ensured, but execution time increases
Solution Approach 1:
The patent implements preliminary action by pre-storing vector mask information in dedicated vector mask buffers associated with each lane before the functional processing unit needs it. This allows mask data to be readily available when required, eliminating sequential access delays and reducing overall execution time while maintaining data availability through the buffer storage mechanism.
3Productivity
If separate vector mask buffers are implemented, then read port requirements are reduced and execution efficiency improves, but hardware structure becomes more complex
Solution Approach 1:
The patent applies local quality by implementing dedicated vector mask buffers specifically for each lane, tailored to the local needs of that lane's functional processing unit. Each buffer is locally associated with its corresponding lane, providing optimized mask storage and access for that specific lane without requiring global changes to the entire register file structure, thus improving execution efficiency while managing hardware complexity through modular, lane-specific implementation.
Data Source
AI summary
Systems and methods related to vector mask buffers in a vector instruction execution pipeline are disclosed herein. The vector instruction execution pipeline may include several lanes. Each lane may include a vector register file, a vector mask buffer, and a functional processing unit. The vector register file may store operand data and the vector mask buffer may store a vector mask associated with the operand data. In a lane, the operand data may be read from the register file into a functional processing unit, and the vector mask may be read from the vector mask buffer to the functional processing unit. The functional processing unit may process the operand data based on the vector mask. The lane-specific vector mask buffers improve the efficiency of the vector instruction execution pipeline by storing the vector masks proximate to where the vector masks will be used.