Load Register on Condition Immediate Instruction for Processor Efficiency
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Solution Overview
Problem
Existing data processors have limited instruction sets and require multiple instructions to manage condition codes and immediate values, leading to inefficiencies in processing and performance degradation due to branch prediction mispredictions.
Innovation Solution
The introduction of 'load register on condition immediate' instructions that use a mask operand and immediate value operand to determine the value of a register based on a condition code, reducing the number of registers needed and eliminating unnecessary branch instructions, thereby improving processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional instruction sets are used to manage condition codes and immediate values, then processors can execute basic operations, but the number of instructions increases and processing efficiency decreases
Solution Approach 1:
The patent combines condition code testing and immediate value loading into a single instruction format. The instruction simultaneously evaluates a condition code against a mask operand and loads an immediate value into a register based on the condition, eliminating the need for separate conditional jump and load instructions.
Solution Approach 2:
The load register on condition immediate instruction serves multiple functions: it acts as a conditional branch, a register loading operation, and a condition code evaluation all in one instruction. This multi-functional approach reduces the total instruction count while maintaining full conditional processing capability.
2Productivity
If multiple instructions are used to handle conditional operations, then precise control is achieved, but execution cycles increase
Solution Approach 1:
The instruction performs condition code evaluation and register loading in a single atomic operation, eliminating the need for preliminary conditional checks followed by separate load operations. The condition is evaluated and the appropriate action is executed in one instruction cycle.
3Ease of operation
If branch instructions are used for conditional logic, then control flow is managed, but branch prediction mispredictions occur causing performance degradation
Solution Approach 1:
The patent extracts the conditional logic from traditional branch instructions and embeds it directly into the load instruction itself. By incorporating the condition code mask and immediate value operands into the load instruction format, the patent eliminates separate branch instructions that are prone to misprediction penalties.
4Ease of manufacture
If traditional instruction formats are used, then compatibility with existing processors is maintained, but code length increases
Solution Approach 1:
The instruction format merges traditionally separate operands (condition code mask, register specifier, and immediate value) into a single unified instruction structure. This consolidation reduces the number of instructions needed in the instruction stream, thereby reducing overall code length while maintaining compatibility with standard processor architectures.
Data Source
AI summary
A data processor comprising a plurality of registers, and instruction execution circuitry having an associated instruction set, wherein the instruction set includes an instruction specifying at least a mask operand, a register operand and an immediate value operand, and the instruction execution circuitry, in response to an instance of the instruction, determines a Boolean value based on the mask operand and sets a respective one of a plurality of registers specified by the register operand of the instance to a value of the immediate value operand if the Boolean value is true. The instruction execution circuitry, in response to the instance of the instruction, may set the respective one of the plurality of registers specified by the register operand of the instance to zero if the Boolean value is false.