Processor Trace Optimization via Dependency Tracking
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Solution Overview
Problem
Conventional processors lack a practical hardware-based solution for optimizing traces, which limits their performance in executing instructions efficiently, especially in superscalar-based architectures where control, data, and resource dependencies hinder parallel execution.
Innovation Solution
A method and apparatus that optimize trace sequences by associating symbolic expressions with registers, updating dependency indicators, and processing operations to identify and update dependencies, allowing for the emission of operations in an optimized order that reduces the number of clock cycles required for execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional processors execute instructions in strict program order, then instruction execution is simple and reliable, but processor performance and clock cycle efficiency are limited
Solution Approach 1:
The patent segments instruction execution into traces, which are sequences of basic blocks representing possible execution paths. Each trace is processed independently through the optimization logic, allowing parallel execution of independent traces while maintaining program order through dependency tracking. This segmentation enables performance optimization without overwhelming complexity in the execution engine.
Solution Approach 2:
The patent performs preliminary optimization of traces before execution by analyzing dependency relationships and reordering operations to eliminate unnecessary clock cycles. The optimization logic pre-computes dependency indications and determines optimal emission orders of operations, so that when traces are executed, they can proceed more efficiently without requiring complex real-time decision-making during execution.
2Productivity
If superscalar architectures implement parallel execution of instructions, then processor performance increases, but control, data, and resource dependencies make parallel execution difficult
Solution Approach 1:
The patent introduces dependency indications as intermediary data structures that mediate between the optimization logic and the execution engine. These dependency indications capture control, data, and resource dependencies in a standardized format, allowing the execution engine to handle parallel traces systematically without needing to manage complex dependency relationships directly. The dependency indications serve as an intermediary layer that simplifies dependency management while enabling effective parallel execution.
3Productivity
If hardware-based trace optimization is implemented, then instruction execution efficiency improves, but additional computing resources and hardware complexity are required
Solution Approach 1:
The patent designs the optimization logic to serve multiple functions: it optimizes traces, tracks dependencies, determines emission orders, and prepares operations for execution. By making the optimization logic multi-functional, the patent reduces the need for separate dedicated hardware components for each function, thereby improving instruction execution efficiency without proportionally increasing hardware resource requirements.
4Loss of time
If traces are optimized by reordering operations, then clock cycles required for execution are reduced, but dependency relationships between operations become more complex to manage
Solution Approach 1:
The patent performs preliminary analysis of dependency relationships during trace optimization, determining the optimal emission order of operations before execution begins. By pre-computing dependency indications and establishing operation sequences in advance, the system reduces the time required during actual execution while maintaining accurate dependency tracking. This preliminary action eliminates the need for complex real-time dependency management during trace execution.
Data Source
AI summary
A method and apparatus for optimizing a sequence of operations adapted for execution by a processor is disclosed to include associating a symbolic expression with each of at least a subset of the registers, holding a set of dependency indications that specify for each particular symbolic expression which, if any, of the other symbolic expressions must be emitted as operations prior to emitting the particular symbolic expression, locating an operation, if any, that is next within the sequence of operations and setting that operation to be a working operation and processing the working operation. Processing is performed by handling the working operation by a combination of updating zero or more of the symbolic expressions and emitting zero or more of the symbolic expressions as operations, identifying which, if any, of the symbolic expressions that were updated in process were updated such that they must be emitted prior to which other, if any, of the symbolic expressions, and then updating the dependency indicators to include any such dependencies, and identifying which, if any, of the symbolic expressions that were updated in process were updated such that they no longer need to be emitted prior to which other, if any, of the symbolic expressions, and then updating the dependency indicators to remove any such dependencies.