Vector Instruction Beat Status Tracking for Exception Handling
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Solution Overview
Problem
Existing data processing systems face inefficiencies in handling vector instructions, particularly in overlapping execution and exception handling, due to rigid assumptions about instruction overlap and lack of flexibility in tracking progress across different micro-architectural implementations.
Innovation Solution
The introduction of beat status information to track the completion of processing beats within vector instructions, allowing for flexible overlap and efficient handling of exceptions by suppressing completed beats and enabling quicker response to events, thereby improving performance and energy efficiency across various micro-architectural designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vector instructions are overlapped in execution to improve throughput, then productivity increases, but device complexity increases due to the need for tracking and managing multiple instruction states
Solution Approach 1:
The patent segments vector instruction execution into discrete beats, where each beat processes a portion of the vector data. This segmentation allows the processor to track execution progress at the beat level rather than requiring complex tracking of entire vector instructions, thereby enabling instruction overlap while managing complexity through structured decomposition of the execution process
Solution Approach 2:
The patent implements feedback mechanisms through beat status information that is tracked and used to control subsequent execution. This feedback system allows the processor to monitor which beats have completed and which are in progress, enabling intelligent scheduling and overlap of vector instructions without requiring excessive control overhead, as the feedback provides precise state information for decision-making
2Productivity
If beat status information is tracked to enable flexible overlap and efficient exception handling, then productivity improves, but device complexity increases due to additional storage and control requirements
Solution Approach 1:
The patent performs preliminary action by pre-tracking beat status information during vector instruction execution. This advance tracking of beat completion states enables rapid exception handling without requiring complex analysis at exception time, as the necessary state information is already prepared and stored in an organized manner, improving exception response efficiency while maintaining manageable storage requirements
Solution Approach 2:
The patent applies discarding and recovering by selectively suppressing already-completed beats when exceptions occur. Rather than storing and managing all possible execution states, the system discards the need to re-execute beats that have already completed by tracking their status, thereby reducing storage overhead while maintaining productivity through efficient exception recovery that skips unnecessary reprocessing
Data Source
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AI summary
Processing circuitry (4) performs multiple beats of processing in response to a vector instruction, each beat comprising processing corresponding to a portion of a vector value comprising multiple data elements. The processing circuitry (4) sets beat status information (22) indicating which beats of a group of two or more vector instructions have completed. In response to a return-from-event request indicating a return to processing of the given vector instruction, the processing circuitry (4) resumes processing of the group of uncompleted vector instructions while suppressing beats already completed, based on the beat status information (22).