Single Instruction Array Index Computation for 64-Bit Servers
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Solution Overview
Problem
The disparity between 32-bit indices and 64-bit array addresses in 64-bit servers requires multiple adjustments, increasing programming overhead and negatively impacting application performance, especially for large data sets.
Innovation Solution
A single instruction that sign extends and adjusts a 32-bit index to match a 64-bit array address, combining both operations to reduce the need for multiple instructions and optimize array index computations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple adjustments are used to convert 32-bit indices to 64-bit array addresses, then the array index computation can be performed on a 64-bit server, but the programming overhead increases and application performance deteriorates
Solution Approach 1:
The patent combines multiple adjustment operations (sign extension and size adjustment) into a single instruction. The single instruction takes a 32-bit index, performs sign extension to 64 bits, and adjusts for element size in one operation, eliminating the need for multiple separate instructions and reducing programming overhead.
Solution Approach 2:
The single instruction performs multiple functions: it handles sign extension, size adjustment, and prepares the final 64-bit array address. This multi-functional instruction can handle different data types and array configurations without requiring multiple specialized instructions, thereby simplifying the computation process.
2Reliability
If multiple adjustment instructions are used to handle index conversion, then correct array addressing is achieved, but programming overhead increases
Solution Approach 1:
The patent merges multiple adjustment steps into a single instruction that performs sign extension and size adjustment simultaneously. This reduces the number of instructions executed, thereby reducing programming overhead while maintaining computational accuracy through the integrated operation.
Solution Approach 2:
The single instruction performs preliminary adjustments (sign extension and size multiplication) before the final memory access operation. By completing these adjustments in advance within a single instruction cycle, the system avoids subsequent adjustment operations and reduces overall execution time.
3Ease of manufacture
If multiple instructions are used for index adjustment, then proper 64-bit address formation is achieved, but application performance is negatively impacted
Solution Approach 1:
The patent combines multiple adjustment operations into a single instruction that forms the 64-bit address in one operation. This eliminates multiple instruction executions, reducing the total time required for address formation and thereby improving application performance while maintaining correctness.
Solution Approach 2:
The single instruction changes the parameter representation of the index from 32-bit to 64-bit through sign extension and size adjustment within a single operation. This parameter transformation is performed efficiently in one instruction cycle, improving execution speed while ensuring correct address formation.
Data Source
AI summary
Embodiments are directed to a method of adjusting an index, wherein the index identifies a location of an element within an array. The method includes executing, by a computer, a single instruction that adjusts a first parameter of the index to match a parameter of an array address. The single instruction further adjusts a second parameter of the index to match a parameter of the array element. The adjustment of the first parameter includes a sign extension.