Atomic Instruction Group Decoding for Power-Performance Balance
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Solution Overview
Problem
Designers of instruction set architectures (ISAs) and processors face challenges in balancing power consumption and performance, as higher performance often comes at the cost of increased power consumption, and lower power consumption results in reduced performance.
Innovation Solution
The method involves fetching and decoding groups of instructions that can execute atomically, using a processor with a front-end control unit and instruction decoder to process information about the group size, and utilizing meta-information and control information to optimize execution, such as through predication and reduced register file accesses, allowing for better balancing of performance and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If instructions are designed to deliver higher performance, then processing capability is improved, but power consumption increases
Solution Approach 1:
The patent segments instructions into groups that execute atomically, with each group having a header containing metadata about the group size. This segmentation allows the processor to handle instructions in manageable units, improving throughput without proportionally increasing power consumption for each individual instruction.
Solution Approach 2:
The patent implements preliminary action by including group size information in the instruction group header, which is decoded before execution. This allows the processor to pre-determine the number of instructions in a group and allocate resources accordingly, improving execution efficiency while avoiding the power overhead of dynamic determination during execution.
2Productivity
If a large amount of hardware resources is used, then performance is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic resource allocation by using the group size field to determine how many instructions are in each atomic group. The processor dynamically adjusts its resource utilization based on the actual group size rather than being fixed, allowing high performance when needed while conserving power when fewer instructions are present.
Solution Approach 2:
The patent changes the parameter of instruction grouping by varying the group size according to the actual workload. The group size field in the header allows the system to adapt the number of instructions processed atomically, optimizing the balance between hardware resource utilization and power consumption for different execution scenarios.
3Productivity
If instruction groups execute atomically, then execution efficiency is improved, but decoding complexity increases
Solution Approach 1:
The patent extracts the group size information into a separate field in the instruction group header, distinct from the individual instruction opcodes. This extraction simplifies the decoding process by providing explicit metadata about the group composition, allowing the processor to quickly determine execution boundaries without complex analysis of the instruction stream.
Data Source
AI summary
A method including fetching a group of instructions, where the group of instructions is configured to execute atomically by a processor is provided. The method further includes decoding at least one of a first instruction or a second instruction, where: (1) decoding the first instruction results in a processing of information about a group of instructions, including information about a size of the group of instructions, and (2) decoding the second instruction results in a processing of at least one of: (a) a reference to a memory location having the information about the group of instructions, including information about the size of the group of instructions or (b) a processor status word having information about the group of instructions, including information about the size of the group of instructions.