Mixed-Precision Floating-Point Pipelines for Throughput–Power Balance
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Solution Overview
Problem
Existing processor architectures face challenges in efficiently executing operations of different precisions while balancing performance and power consumption, particularly in graphics processors, where lower-precision operations often lead to increased power consumption and reduced throughput.
Innovation Solution
Implementing superscalar techniques that dispatch multiple instructions to execution units with different capabilities, including 32-bit and 16-bit pipelines, and utilizing higher-precision pipelines to execute lower-precision operations with two rounding steps to maintain precision and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lower-precision pipelines are used to execute lower-precision operations, then power consumption is reduced, but throughput is reduced
Solution Approach 1:
The patent implements a superscalar execution architecture where pipelines are designed to handle multiple precision levels. Higher-precision pipelines (e.g., 32-bit) can execute both higher-precision and lower-precision operations, while lower-precision pipelines (e.g., 16-bit) handle lower-precision operations. This multi-functionality allows the system to dynamically select the appropriate pipeline based on operation precision, thereby reducing power consumption for lower-precision operations while maintaining high throughput through parallel execution capabilities.
Solution Approach 2:
The execution architecture employs dynamic pipeline selection based on the precision requirements of incoming operations. The scheduler dynamically assigns operations to appropriate pipelines, and the system can adaptively switch between using lower-precision pipelines for power efficiency and higher-precision pipelines for maximum throughput when needed. This dynamic allocation resolves the contradiction by making the system flexible rather than static in its pipeline usage.
2Productivity
If higher-precision pipelines execute lower-precision operations, then throughput is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by matching pipeline precision to operation precision requirements. Instead of using a uniform high-precision pipeline for all operations, the system employs lower-precision pipelines specifically for lower-precision operations where high precision is not required. This localized precision matching ensures that power consumption is optimized for each specific operation type while maintaining overall system throughput through the availability of multiple specialized pipelines.
3Adaptability or versatility
If multiple pipelines with different precisions are implemented, then versatility is improved, but device complexity increases
Solution Approach 1:
The execution architecture is segmented into multiple independent pipelines, each optimized for specific precision levels. This segmentation allows each pipeline to be relatively simple in design while the collection provides comprehensive precision support. The scheduler segmentes the instruction stream and directs appropriate operations to appropriate pipelines, managing the complexity through structured division rather than a single complex unified pipeline.
Solution Approach 2:
The system implements partial precision support in each pipeline rather than full precision support across all pipelines. Each pipeline is designed to handle specific precision levels adequately, which simplifies individual pipeline design. The collective action of multiple pipelines with partial capabilities provides the full versatility needed, resolving the complexity issue by distributing functionality across simpler components.
Data Source
AI summary
Techniques are disclosed relating to scheduling instructions for floating-point execution units with different capabilities. In some embodiments, a first pipeline is configured to execute a first type of floating-point operation on operands having up to a first precision and a second pipeline is configured to execute the first type of floating-point operation on operands having up to a second, greater precision. In some embodiments, round circuitry is configured to round results from an output precision of the second pipeline to an output precision of the first pipeline. Scheduling circuitry may select operations for issuance for a given cycle from multiple ready threads. This may include to prioritize a determined highest-precision operation of the first type from ready operations and assign the determined operation to a lowest-precision pipeline, of the multiple pipelines, that is configured to perform the first type of operation according to the operand precision of the determined operation.