Vector Load-Store Buffering for Single LSU Operation Tracking
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Solution Overview
Problem
Existing central processing units (CPUs) face inefficiencies in handling vector data operations due to the need to track multiple micro-operations for vector register accesses, leading to potential backups and reduced performance in load store units.
Innovation Solution
Implementing a buffer between the load store unit and vector registers to decouple memory transfers, allowing dual dispatch of vector memory instructions as macro-operations, which are then cracked into micro-operations, using a common identifier for coordination and reducing the load on the load store unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple micro-operations are tracked for vector register accesses, then vector data operations can be executed, but the load store unit experiences backups and performance decreases
Solution Approach 1:
The patent segments the handling of vector memory operations by introducing a buffer that separates the load store unit from vector register accesses. The buffer divides the tracking responsibility: the load store unit only tracks a single macro-operation identifier, while the buffer manages the multiple micro-operations corresponding to that identifier. This segmentation reduces the load store unit's complexity while maintaining vector operation capability.
Solution Approach 2:
The buffer acts as an intermediary between the load store unit and vector register accesses. It receives macro-operation identifiers from the load store unit, retrieves or generates the corresponding multiple micro-operations, and manages the mapping between macro-operations and micro-operations. This intermediary structure allows the load store unit to operate with simplified tracking while the buffer handles the complexity of multiple micro-operations.
2Productivity
If a buffer is introduced to decouple memory transfers, then load store unit performance improves, but device structure becomes more complex
Solution Approach 1:
The buffer is designed to handle multiple functions: it stores macro-operation identifiers, maintains mapping to micro-operations, manages retrieval of micro-operations, and coordinates data flow between the load store unit and vector registers. By consolidating these multiple functions into a single buffer structure, the patent avoids the need for separate complex components for each function, thereby improving load store unit efficiency while limiting the increase in overall device complexity.
3Productivity
If vector register renaming is decoupled from load store unit operations, then backups are prevented, but coordination complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the buffer monitors the status of macro-operations and micro-operations, and adjusts the retrieval and issuance of micro-operations based on the readiness of vector registers and the completion status of memory operations. This feedback loop allows the buffer to coordinate between vector register renaming and load store unit operations dynamically, preventing backups while managing coordination complexity through intelligent control rather than rigid structural complexity.
Data Source
AI summary
Systems and methods are disclosed for transferring data between a memory system and a vector register file. For example, a system may include a vector pipeline including a vector physical register file; a load store unit; one or more pipeline stages configured to decode a vector memory instruction to obtain a macro-operation and dispatch the macro-operation to both the load store unit and the vector pipeline, and a baler circuitry, including a buffer with entries. The vector pipeline is configured to crack the macro-operation into multiple micro-operations. The baler circuitry is configured to implement the multiple micro-operations to transfer data between one or more selected entries of the buffer and respective registers of the vector physical register file. The load store unit is configured to implement the macro-operation to transfer data between one or more addresses in a memory system and the one or more selected entries of the buffer.