Block-Based Processor Out-of-Order Execution Without Register Renaming
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Solution Overview
Problem
Current processor architectures, particularly RISC designs, face challenges in sustaining performance improvements due to increased complexity and energy consumption, as they struggle with register renaming, dataflow analysis, and misspeculation recovery, which hinders efficient out-of-order execution.
Innovation Solution
The introduction of block-based processor architectures with an Explicit Data Graph Execution (EDGE) ISA, which enables high instruction-level parallelism and out-of-order execution while reducing complexity and overhead, by eliminating the need for register renaming and using a hybrid dataflow execution model that supports imperative programming languages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional RISC architectures implement out-of-order execution, then instruction-level parallelism and processor performance improve, but device complexity increases due to register renaming, dataflow analysis, and misspeculation recovery mechanisms
Solution Approach 1:
The patent extracts and eliminates the complex register renaming mechanism from traditional out-of-order execution systems. By using a simplified approach where instructions are executed out-of-order but committed in-order without register renaming, the system achieves instruction-level parallelism while removing the complexity associated with tracking and renaming registers across execution paths.
Solution Approach 2:
Instead of using register renaming to enable out-of-order execution (the conventional approach), the patent inverts the logic by allowing out-of-order execution without register renaming. The system uses a simplified architecture where the program counter and instruction pointers maintain order, but execution can proceed out-of-order, reversing the traditional paradigm.
2Productivity
If traditional RISC architectures implement out-of-order execution, then processor performance improves, but energy consumption increases due to complex architectural features
Solution Approach 1:
The patent removes energy-intensive components such as register renaming hardware, complex dataflow analysis circuits, and misspeculation recovery mechanisms. By extracting these unnecessary elements, the system maintains processor performance through out-of-order execution while significantly reducing the energy consumption associated with managing complex architectural features.
3Device complexity
If block-based processor architectures are used, then complexity and overhead are reduced, but the ability to handle traditional imperative programming languages may be limited
Solution Approach 1:
The patent designs a universal block-based architecture that can execute both traditional imperative programming languages and dataflow-based algorithms. The simplified out-of-order execution model without register renaming is shown to be sufficiently versatile to handle conventional programming paradigms while maintaining low complexity, achieving multi-functionality across different programming models.
Data Source
AI summary
Apparatus and methods are disclosed for implementing block-based processors including field programmable gate-array implementations. In one example of the disclosed technology, a block-based processor includes an instruction decoder configured to generate decoded ready dependencies for a transactional block of instructions, where each of the instructions is associated with a different instruction identifier encoded in the transactional block. The processor further includes an instruction scheduler configured to issue an instruction from a set of instructions of the transactional block of instructions. The instruction is issued based on determining that decoded ready state dependencies for an instruction are satisfied. The determining includes accessing storage with the decoded ready dependencies indexed with a respective instruction identifier that is encoded in the transactional block of instructions.