Vector Packed Signed Data Multiply Negate Accumulate Instruction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing single instruction multiple data (SIMD) microarchitectures require sequences of instructions for multiplication, negation, and accumulation operations, leading to lower performance and increased power consumption.
Innovation Solution
A vector packed instruction that performs multiplication, negation, and accumulation of signed word values in a single operation, utilizing execution circuitry to multiply, negate, and accumulate data from source operands, with optional saturation, thereby reducing the need for multiple instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequences of instructions are used for multiply-accumulate operations in existing SIMD microarchitectures, then the operations can be performed, but performance is reduced and power consumption increases
Solution Approach 1:
The patent combines multiple separate instructions (multiply instruction, addition instruction, and accumulation instruction) into a single integrated instruction that performs all three operations atomically. This merging eliminates the need for sequential execution of multiple instructions, thereby improving performance and reducing execution time while maintaining the correctness of the multiply-accumulate operation.
2Productivity
If sequences of instructions are used for multiply-accumulate operations, then the operations can be completed, but power consumption increases
Solution Approach 1:
By merging multiple instructions into a single atomic operation, the patent reduces the total number of instruction cycles required to complete the multiply-accumulate operation. Fewer instruction cycles directly translate to lower power consumption, as the processor spends less time executing instructions and fewer clock cycles are consumed overall.
3Adaptability or versatility
If multiple instructions are executed for vector packed signed data processing, then comprehensive operations can be performed, but device complexity increases
Solution Approach 1:
The patent merges multiple instruction functionalities (multiplication, negation, accumulation) into a single unified instruction that operates on vector packed signed data. This reduces the complexity of the instruction sequence from multiple separate operations to one atomic operation, making the device easier to use while maintaining comprehensive operational capability.
Data Source
AI summary
Embodiments of systems, apparatuses, and methods for multiplication, negation, and accumulation of data values in a processor are described. For example, execution circuitry executes a decoded instruction to multiply selected data values from a plurality of packed data element positions in first and second packed data source operands to generate a plurality of first result values, sum the plurality of first result values to generate one or more second result values, negate the one or more second result values to generate one or more third result values, accumulate the one or more third result values with one or more data values from the destination operand to generate one or more fourth result values, and store the one or more third result values in one or more packed data element positions in the destination operand.