Horizontal Vector Instruction With Independent Read And Write Masks
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Solution Overview
Problem
Current computing systems face limitations in efficiently executing multi-element operations with different read and write masks, particularly in vector processing, where existing technologies struggle to handle varying element sizes and combinations effectively within a single instruction.
Innovation Solution
The introduction of a new class of instructions, referred to as 'horizontal' instructions, which allow for input vector operands of one size and output result vectors of a different size, utilizing read and write masks to selectively operate on and write elements, enabling flexible multi-element operations across various vector sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional vector instructions operate on full vector width, then throughput is maximized, but flexibility to operate on subsets of elements is lost
Solution Approach 1:
The vector operation is segmented into two independent masking stages: read mask for selecting input elements and write mask for selecting output elements. This segmentation allows different subsets of elements to be processed and written back independently, resolving the contradiction between full-width throughput and subset flexibility.
Solution Approach 2:
The instruction introduces dynamic mask registers that can be configured at runtime to select different subsets of vector elements. The read and write masks can be independently adjusted, allowing the same instruction to adapt to different operation requirements while maintaining efficient vector processing.
2Measurement precision
If different mask registers are used for read and write operations, then flexibility and precision are improved, but device complexity increases
Solution Approach 1:
The mask registers are designed to serve multiple functions: they can be configured as read masks, write masks, or both simultaneously. This multi-functionality allows precise element selection without proportionally increasing hardware complexity, as the same mask infrastructure supports different operation modes.
Solution Approach 2:
The patent introduces mask register files as intermediary structures between the instruction decoder and execution units. These intermediaries store and manage mask patterns, simplifying the control logic by centralizing mask management rather than embedding complex masking logic throughout the execution path.
3Ease of manufacture
If full vector width operations are always performed, then resource utilization is simplified, but efficiency when processing subsets is reduced
Solution Approach 1:
The execution units are designed to handle full vector width operations (excessive action) but with the capability to apply read and write masks that enable partial action when needed. This approach maintains simple, efficient full-width execution logic while allowing selective element processing through masking, achieving both design simplicity and processing efficiency.
Data Source
AI summary
A method is described that includes reading a first read mask from a first register. The method also includes reading a first vector operand from a second register or memory location. The method also includes applying the read mask against the first vector operand to produce a set of elements for operation. The method also includes performing an operation of the set elements. The method also includes creating an output vector by producing multiple instances of the operation's result. The method also includes reading a first write mask from a third register, the first write mask being different than the first read mask. The method also includes applying the write mask against the output vector to create a resultant vector. The method also includes writing the resultant vector to a destination register.