Shuffle Pattern Generating Circuit for Efficient Index Shifting
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Solution Overview
Problem
Existing shuffle pattern generation methods for processors, such as the PSHUFB instruction, do not provide a straightforward method to generate shuffle patterns that conform to specific index and bit width specifications, leading to difficulties in executing instructions efficiently and increasing power consumption.
Innovation Solution
A shuffle pattern generating circuit that utilizes a shift-copier to generate an index sequence by shifting and copying indices, and an adder to adjust indices, allowing for the generation of shuffle patterns that conform to the required specifications through simple processing like leftward bit shifting, copying, and addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex shuffle pattern generation methods are used, then the shuffle pattern can conform to instruction specifications, but the processing speed decreases and power consumption increases
Solution Approach 1:
The shuffle pattern generation is divided into multiple stages: input stage, shift stage, copy stage, add stage, and output stage. Each stage performs a specific function (shifting bits, copying indices, adding values) to transform the input shuffle pattern into the output pattern that conforms to instruction specifications. This segmentation allows each component to operate simply and efficiently while collectively achieving the complex transformation required.
Solution Approach 2:
The circuit performs preliminary shifting and copying operations on the input shuffle pattern before the final addition operation. By preparing the index sequence through shift and copy operations in advance, the circuit ensures that the subsequent addition operation can be performed efficiently to produce the final conforming shuffle pattern, thereby improving overall processing speed.
2Manufacturing precision
If complex shuffle pattern generation methods are used, then the shuffle pattern can conform to instruction specifications, but power consumption increases
Solution Approach 1:
The generation process is segmented into distinct functional blocks (shift circuit, copy circuit, add circuit) that operate in sequence. Each block performs a simple, dedicated operation that consumes minimal power, avoiding the need for complex general-purpose computation while still achieving the required shuffle pattern transformation that conforms to instruction specifications.
Solution Approach 2:
The patent replaces complex computational mechanisms with dedicated hardware circuits that perform specific operations (shifting, copying, adding) in parallel or sequence. This substitution of general computation with specialized hardware operations reduces power consumption while ensuring accurate generation of shuffle patterns that meet instruction requirements.
3Productivity
If simple processing is used to generate shuffle patterns, then processing speed increases and power consumption decreases, but the shuffle pattern may not conform to instruction specifications
Solution Approach 1:
The circuit is divided into specialized segments (shift, copy, add) that collectively implement the complete transformation required for specification conformity. Each segment performs a simple operation that can be executed quickly, but the combination of segments ensures the output shuffle pattern meets all instruction requirements including index validity and bit width specifications.
Solution Approach 2:
The circuit systematically transforms the input shuffle pattern parameters through controlled bit shifting, copying, and addition operations. These parameter changes are precisely controlled to ensure the output pattern conforms to instruction specifications while maintaining high processing speed through efficient hardware implementation of each transformation step.
Data Source
AI summary
Based on an input index sequence (702) composed of four indices (each having a bit width of 8 bits), a shift-copier generates an index sequence (902) by shifting each index leftward by 1 bit and making two copies of each index, and outputs the generated index sequence (902). An adder generates a shuffle pattern (703) by adding 1, 0, 1, 0, 1, 0, 1 and 0 to the indices in the index sequence (902) from left to right, and outputs the generated shuffle pattern (703).