Vector Load Immediate Decimal Instruction for Register Population
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Solution Overview
Problem
Current computing environments face inefficiencies in processing decimal numbers due to instruction latency and increased memory bandwidth usage when loading small constants from memory, particularly in systems using binary coded decimal (BCD) encodings.
Innovation Solution
The introduction of a Vector Load Immediate Decimal instruction that generates signed packed decimal format numbers without loading them from memory, reducing instruction latency and memory bandwidth by using a sign control and shift amount to create the values directly within a register.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If decimal constants are loaded from memory, then data can be made available for processing, but instruction latency increases and memory bandwidth is consumed
Solution Approach 1:
The patent encodes decimal constants directly within the instruction itself (in the immediate field), so the data is already prepared and embedded in the instruction stream. This eliminates the need to fetch data from memory at execution time, directly reducing instruction latency while maintaining data availability for processing.
2Productivity
If decimal constants are loaded from memory, then processing can proceed, but memory bandwidth is used
Solution Approach 1:
By embedding the decimal constant directly in the instruction's immediate field, the data is prepared in advance and stored with the instruction. This eliminates the memory access operation during execution, reducing memory bandwidth consumption while maintaining processing throughput.
3Ease of operation
If small constants are loaded from memory, then registers can be populated, but data sizes in binary executables increase
Solution Approach 1:
The patent merges the data (decimal constant) and the instruction into a single unified structure. The constant is encoded directly in the immediate field of the instruction, eliminating the need for separate data storage in memory. This reduces binary executable size while maintaining ease of register population through direct encoding.
Data Source
AI summary
An instruction generates a value for use in processing within a computing environment. The instruction obtains a sign control associated with the instruction, and shifts an input value of the instruction in a specified direction by a selected amount to provide a result. The result is placed in a first designated location in a register, and the sign, which is based on the sign control, is placed in a second designated location of the register. The result and the sign provide a signed value to be used in processing within the computing environment.