Scalar-to-Vector Transfer Buffers for Asynchronous Operand Exchange
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Solution Overview
Problem
Existing processor cores face inefficiencies in transferring operands between scalar and vector pipelines, leading to wasted resources and reduced performance due to the need for pipelines to wait for each other to be ready, especially when handling single element operands.
Innovation Solution
Implementing transfer buffers, such as scalar-to-vector and vector-to-scalar buffers, to asynchronously transfer operands between scalar and vector pipelines, allowing them to operate independently and reducing the need for waiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pipelines wait for each other to be ready before transferring operands, then data transfer reliability is ensured, but processor performance deteriorates due to reduced productivity and increased waiting time
Solution Approach 1:
A transfer buffer is introduced as an intermediary component between the scalar pipeline and vector pipeline. The buffer receives operands from the scalar pipeline when ready and stores them, then delivers these operands to the vector pipeline when it is ready, eliminating the need for the pipelines to wait for each other while ensuring reliable data transfer through the buffering mechanism
2Productivity
If pipelines operate independently without waiting, then processor performance improves due to increased productivity, but data transfer reliability may be compromised
Solution Approach 1:
The transfer buffer acts as a mediator that enables independent pipeline operation while maintaining data transfer reliability. Each pipeline can proceed independently - the scalar pipeline issues operands when ready and the vector pipeline consumes them when ready - but the buffer ensures that data is reliably transferred between the independent pipelines without either pipeline blocking the other
3Productivity
If transfer buffers are implemented to enable asynchronous operation, then processor performance improves, but device complexity increases
Solution Approach 1:
The transfer buffer is implemented as a relatively simple intermediary structure with standard buffer components (storage elements, control logic for tracking ready states). This simple buffer design enables asynchronous independent pipeline operation and significantly improves processor performance without introducing substantial complexity to the overall pipeline architecture
Data Source
AI summary
Systems and methods are disclosed for transferring an operand between a vector pipeline and a scalar pipeline. For example, some methods may include transferring an operand from a scalar pipeline to a scalar-to-vector buffer responsive to the scalar pipeline executing a first micro-op, wherein the scalar-to-vector buffer includes an entry having a width equal to a width of a scalar register of the scalar pipeline and a data store configured to store an indication mapping the entry to the first micro-op; updating the data store to include the indication mapping the entry to the first micro-op; identifying, by the vector pipeline in response to execution of a second micro-op and in dependence on the indication mapping the entry to the first micro-op, the entry storing the operand; and transferring the operand from the entry in the scalar-to-vector buffer to the vector pipeline responsive to the vector pipeline executing the second micro-op.