Block-Based Instruction Execution via Register Access
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Solution Overview
Problem
Current processor architectures, such as superscalar out-of-order microarchitectures, face challenges in achieving sustained performance improvements due to resource-intensive circuits and complexity, particularly in register renaming, dataflow analysis, and misspeculation recovery, which hinder energy efficiency and performance.
Innovation Solution
The implementation of block-based instruction set architectures (BB-ISAs) with explicit data graph execution (EDGE) architectures, utilizing register access instructions to initiate instruction block execution, reduces complexity and overhead by eliminating the need for register renaming and misspeculation recovery, and supports high instruction-level parallelism and out-of-order execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If superscalar out-of-order microarchitectures are used to achieve high instruction-level parallelism, then processor performance is improved, but device complexity and energy consumption increase due to resource-intensive circuits for register renaming, dataflow analysis, and misspeculation recovery
Solution Approach 1:
The patent segments the instruction stream into fixed-size instruction blocks that are executed atomically. This segmentation eliminates the need for complex dynamic register renaming and misspeculation recovery mechanisms, as each block executes as an independent unit with predetermined boundaries, thereby reducing microarchitecture complexity while maintaining high instruction-level parallelism through block-level parallel execution
Solution Approach 2:
The patent performs preliminary actions by pre-determining instruction block boundaries and pre-allocating resources before execution. Instruction blocks are prepared and validated in advance, allowing the processor to initiate block execution without complex runtime analysis, thus reducing the need for resource-intensive circuits while preserving performance through efficient block-level parallelism
2Productivity
If superscalar out-of-order microarchitectures are used to achieve high instruction-level parallelism, then processor performance is improved, but energy efficiency deteriorates due to resource-intensive circuits
Solution Approach 1:
By segmenting instructions into fixed-size atomic blocks, the patent eliminates energy-intensive dynamic register renaming and misspeculation recovery operations. Each block executes independently with predetermined resource allocation, significantly reducing energy consumption while maintaining high instruction-level parallelism through block-level parallel execution
Solution Approach 2:
The patent employs simple, fixed-format instruction blocks that can be quickly created and discarded without complex management overhead. These lightweight blocks eliminate the need for expensive, energy-intensive bookkeeping structures, achieving high parallelism with minimal energy expenditure per block execution
3Device complexity
If block-based instruction set architectures with atomic execution are used, then device complexity is reduced by eliminating register renaming and misspeculation recovery, but instruction-level parallelism capability must be maintained
Solution Approach 1:
The patent segments the instruction stream into atomic blocks that can be executed in parallel. This segmentation enables simple hardware to achieve high instruction-level parallelism by independently executing multiple blocks simultaneously, maintaining productivity while dramatically reducing device complexity through elimination of complex renaming and recovery mechanisms
Solution Approach 2:
The patent shifts from fine-grained instruction-level parallelism to coarse-grained block-level parallelism, moving to another dimension of parallel execution. This dimensional change allows simple hardware to achieve high parallelism by executing multiple independent blocks concurrently, maintaining productivity while reducing complexity
Data Source
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AI summary
Apparatus and methods are disclosed for initiating instruction block execution using a register access instruction (e.g., a register Read instruction). In some examples of the disclosed technology, a block-based computing system can include a plurality of processor cores configured to execute at least one instruction block. The at least one instruction block encodes a data-flow instruction set architecture (ISA). The ISA includes a first plurality of instructions and a second plurality of instructions. One or more of the first plurality of instructions specify at least a first target instruction without specifying a data source operand. One or more of the second plurality of instructions specify at least a second target instruction and a data source operand that specifies a register.