Vector Register Elemental Offset for Unaligned Memory Access
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Solution Overview
Problem
Current processor architectures face inefficiencies in performing unaligned memory accesses, as they often require separate memory operations and consume additional resources, making it difficult to combine unaligned memory accesses with vector operations into a single macro-instruction.
Innovation Solution
The introduction of an elemental offset field in register operands allows for direct addressing of unaligned data within registers, enabling the combination of unaligned memory accesses with vector operations into a single macro-instruction, thereby improving performance and programmability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate memory operations are used for unaligned accesses, then memory access flexibility is improved, but resource consumption increases and processing efficiency decreases
Solution Approach 1:
The patent combines unaligned memory access operations with vector operations into a single macro-instruction, eliminating the need for separate aligning instructions. This merging of operations directly improves processing efficiency by reducing the number of discrete operations required while maintaining the flexibility to access unaligned memory locations.
Solution Approach 2:
The macro-instruction design enables a single instruction to perform multiple functions: it handles both the memory access and the vector operation simultaneously. This multi-functionality allows the processor to maintain adaptability for various memory access patterns while improving productivity through consolidated operation execution.
2Adaptability or versatility
If separate aligning instructions are used for unaligned memory accesses, then memory access capability is improved, but resource consumption increases
Solution Approach 1:
The patent merges the alignment function with the vector operation into a single macro-instruction. This eliminates the need for separate aligning instructions, thereby reducing device complexity and resource consumption while preserving full memory access capability for unaligned addresses.
Solution Approach 2:
The patent extracts the alignment operation from being a separate instruction and integrates it within the vector operation macro-instruction. This extraction reduces the number of discrete operations required, lowering resource consumption while maintaining the ability to handle unaligned memory accesses.
3Measurement precision
If multiple separate operations are used for unaligned memory access, then access precision is improved, but instruction execution time increases
Solution Approach 1:
The patent combines multiple separate operations (memory access and vector operation) into a single macro-instruction that executes atomically. This merging maintains the precision of unaligned memory access while reducing instruction execution time by eliminating the sequential overhead of multiple separate instructions.
Solution Approach 2:
The macro-instruction structure performs preliminary setup of the unaligned memory access parameters within the instruction encoding itself, allowing the operation to execute in a single step without requiring preliminary aligning instructions, thereby reducing execution time while maintaining access precision.
Data Source
AI summary
Methods and apparatuses relating to a vector instruction with a register operand with an elemental offset are described. In one embodiment, a hardware processor includes a decode unit to decode a vector instruction with a register operand with an elemental offset to access a first number of elements in a register specified by the register operand, wherein the first number is a total number of elements in the register minus the elemental offset, access a second number of elements in a next logical register, wherein the second number is the elemental offset, and combine the first number of elements and the second number of elements as a data vector, and an execution unit to execute the vector instruction on the data vector.