Video Data Byte Alignment in GPU Processing Units
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Solution Overview
Problem
Conventional GPUs are inefficient in processing video data due to the mismatch between the 8-bit width of pixel data and the 32-bit width of memory words, requiring multiple logic operations over several clocks.
Innovation Solution
A processing unit with a buffer and an execution unit that shifts and aligns bytes of video data within a data word to enable efficient processing using a single instruction, allowing for alignment and processing of desired bytes in a single clock cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional GPUs process video data using standard 32-bit memory words, then the GPU can utilize its native word width for processing, but the mismatch with 8-bit pixel data requires multiple logic operations over several clocks, reducing processing efficiency
Solution Approach 1:
The patent segments the 32-bit data word into four separate 8-bit byte buffers, allowing independent processing of each byte while maintaining the 32-bit word structure. This segmentation enables the GPU to process video data byte-by-byte within a single clock cycle without requiring multiple sequential operations, directly resolving the efficiency problem caused by the width mismatch between 32-bit memory words and 8-bit pixel data
Solution Approach 2:
The patent introduces a dimensional transformation by organizing data into a two-dimensional array structure where four 8-bit bytes are arranged within a single 32-bit word. This allows the GPU to process multiple bytes simultaneously in parallel using vectorized operations, converting a sequential processing approach into a parallel one that completes all operations within a single clock cycle
2Productivity
If conventional GPUs use multiple logic operations to process video data, then the GPU can handle the width mismatch between 8-bit pixel data and 32-bit memory words, but the processing requires several clock cycles, reducing throughput
Solution Approach 1:
The patent merges multiple byte processing operations into a single unified operation by loading all four bytes into a single 32-bit register and applying vectorized arithmetic operations across all bytes simultaneously. This combining of operations into one atomic instruction executes within a single clock cycle, eliminating the need for sequential processing steps and directly increasing throughput while reducing processing duration
3Productivity
If the processing unit processes multiple bytes within a single data word, then processing efficiency improves, but the complexity of aligning and processing specific bytes increases
Solution Approach 1:
The patent applies preliminary action by pre-aligning byte data within the 32-bit word before processing occurs. The data loading stage automatically positions bytes at their correct offsets within the word, and the execution unit uses shift operations to align bytes to their processing positions. This preliminary alignment preparation eliminates complex alignment logic during the actual processing phase, maintaining high productivity while managing complexity through advance preparation
Data Source
AI summary
Disclosed herein is a processing unit configured to process video data, and applications thereof. In an embodiment, the processing unit includes a buffer and an execution unit. The buffer is configured to store a data word, wherein the data word comprises a plurality of bytes of video data. The execution unit is configured to execute a single instruction to (i) shift bytes of video data contained in the data word to align a desired byte of video data and (ii) process the desired byte of the video data to provide processed video data.