Prefix Instruction Modifies Next Sequential Instruction Fields
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Solution Overview
Problem
Current computer systems face limitations in improving instruction functionality without relying on architecture resources, leading to performance degradation and dependency on general registers.
Innovation Solution
A method is introduced that involves fetching a prefix machine instruction and a next sequential instruction, modifying a field of the latter based on the prefix instruction, and executing the modified instruction, allowing for dynamic parameter assignment and extended field values beyond the standard instruction set architecture limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If prefix machine instruction is used to modify next sequential instruction, then instruction functionality is enhanced and performance is improved, but device complexity increases
Solution Approach 1:
The instruction modification capability is segmented into a separate prefix instruction mechanism. The prefix instruction (e.g., EXECUTE RELATIVE LONG) acts as an independent segment that prepares modification parameters, which are then applied to the next sequential instruction. This segmentation allows the modification logic to be handled in discrete steps rather than requiring complete redesign of the instruction execution pipeline.
Solution Approach 2:
The prefix instruction performs preliminary actions by pre-calculating and storing modification parameters (such as field values, register selections, or displacement amounts) before the actual next sequential instruction is executed. This preliminary preparation enables the subsequent instruction to be modified without requiring complex real-time analysis during the main execution flow.
2Adaptability or versatility
If field values exceed standard instruction set architecture limits, then operand range is extended, but manufacturing precision requirements increase
Solution Approach 1:
The solution extends the operand value range by adding another dimension to the instruction encoding. Instead of increasing the bit width of single fields beyond standard limits, the prefix instruction introduces an additional dimensional layer that stores extended values (such as displacement amounts or register offsets). This multi-dimensional approach allows values to exceed traditional 16-bit or 32-bit limits while maintaining standard field widths in the main instruction.
Solution Approach 2:
The prefix instruction acts as an intermediary structure that bridges the gap between standard instruction set limits and the need for extended operand ranges. It holds intermediate calculation results or extended parameters that are then applied to modify the next sequential instruction's fields, effectively mediating between the constrained main instruction format and the required extended value ranges.
Data Source
AI summary
An modify next sequential instruction (MNSI) instruction, when executed, modifies a field of the fetched copy of the next sequential instruction (NSI) to enable a program to dynamically provide parameters to the NSI being executed. Thus the MNSI instruction is a non-disruptive prefix instruction to the NSI. The NSI may be modified to effectively extend the length of the NSI field, thus providing more registers or more range (in the case of a length field) than otherwise available to the NSI instruction according to the instruction set architecture (ISA).