Zero-clearing scalar moves for vector registers

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Solution Overview

Problem

Existing architectures face inconsistencies in move instructions when transferring data between memory and registers, leading to unpredictable behavior and increased complexity in compilation and programming.

Innovation Solution

The introduction of a zero-clearing move instruction that consistently clears all data elements in a packed data register except for the least significant element, ensuring predictable behavior and simplifying compilation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing move instructions are used to transfer data between memory and registers, then data transfer functionality is provided, but inconsistent behavior occurs leading to unpredictable results

Engineering Contradiction:

Improvepredictability of move instruction behaviorVSAvoidcomplexity in handling data operations

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The move instruction is segmented into two distinct operations: (1) copying the source data element to the destination register, and (2) clearing all other data elements in the destination register to zero. This segmentation resolves the contradiction by ensuring consistent zero-clearing behavior across all move operations, making the instruction predictable and simplifying compilation while maintaining reliable data transfer functionality.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If move instructions transfer data from memory to registers, then data transfer is enabled, but remaining vector elements have undefined values causing unpredictable behavior

Engineering Contradiction:

Improveconvenience of working with scalar valuesVSAvoidpredictability of vector operation behavior

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The move instruction performs preliminary action by automatically clearing all vector elements to zero before the data transfer completes. This ensures that when scalar values are worked with in packed data registers, the remaining elements are guaranteed to be zero, providing predictable and reliable vector operation behavior without requiring additional manual clearing operations.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If existing move instructions are used, then data transfer between memory and registers is possible, but compilation complexity increases due to inconsistencies

Engineering Contradiction:

Improvedata transfer capabilityVSAvoidcompilation complexity

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The move instruction changes the parameter behavior by consistently clearing all destination register elements to zero regardless of source type (memory or register). This parameter change eliminates inconsistencies that previously required complex compilation handling, thereby simplifying the compilation process while maintaining efficient data transfer capability between memory and registers.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250028533A1Zero-clearing scalar moves

Publication Date: 2025.01.23 INTEL PRODUCTS IP LLC

AI summary

Techniques for zero clearing scalar moves are described. For example, one or more instructions are supported which, when executed, are to cause a scalar move of a 16-bit or 32-bit floating-point value from a source to a destination. When the destination is a vector register, all other data elements are to be zeroed.