Multi-Condition Branch Instruction for Switch Statement Optimization
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Solution Overview
Problem
Current methods for executing switch statements and other multi-condition branch statements are limited to checking one condition at a time, leading to expensive execution cycles.
Innovation Solution
A multi-condition branch instruction (MCBI) is introduced, which directs a processing system to perform a conditional branch operation based on the results of multiple condition evaluations, allowing for the execution of multiple conditions in a single execution cycle similar to a single conditional branch instruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If current methods using series of compare and branch instructions are used to execute switch statements, then each condition can be evaluated sequentially, but the execution cycle cost increases significantly
Solution Approach 1:
The patent combines multiple condition evaluations and branch destinations into a single multi-condition branch instruction. Instead of executing conditions sequentially using multiple compare and branch instructions, the invention merges multiple conditions into one instruction that evaluates all conditions and selects the appropriate branch destination in a single execution cycle, directly resolving the contradiction between comprehensive condition evaluation and execution cost
Solution Approach 2:
The multi-condition branch instruction serves multiple functions simultaneously: it evaluates multiple conditions, compares them against branch destinations, and selects the appropriate execution path all within a single instruction. This multi-functional approach eliminates the need for separate compare and branch instructions for each condition, thereby reducing execution cycle cost while maintaining full condition evaluation capability
2Adaptability or versatility
If multiple condition evaluations are performed sequentially using separate instructions, then each condition can be checked independently, but the code size and execution time increase
Solution Approach 1:
The invention merges multiple condition evaluations and their corresponding branch destinations into a single multi-condition branch instruction. This consolidation allows the processor to evaluate multiple conditions and select the appropriate branch destination in one execution cycle, significantly reducing execution time compared to sequential evaluation while maintaining the ability to handle multiple conditions adaptively
3Ease of manufacture
If a series of compare and branch instructions are used for switch statements, then existing instruction sets can be used, but the execution efficiency deteriorates
Solution Approach 1:
The multi-condition branch instruction is designed to perform multiple functions that were previously requiring separate instructions: evaluating multiple conditions, comparing against branch destinations, and selecting execution paths all within a single instruction. This multi-functional approach dramatically improves execution efficiency while maintaining compatibility with existing processor architectures through a unified instruction format
Data Source
AI summary
Various embodiments of the present disclosure relate to the conditional execution of program code. In an example embodiment, a system including instruction fetch circuitry, decoder circuitry, and multi-condition branch circuitry is provided. The instruction fetch circuitry is configured to fetch a multi-condition branch instruction (MCBI) from memory. The MCBI identifies multiple status registers and multiple branch destinations. The multiple status registers of the MCBI are representative of registers which hold results of multiple condition evaluations, such that each status register corresponds to a different one of the multiple condition evaluations. Similarly, the multiple branch destinations of the MCBI also correspond to a different one of the multiple condition evaluations. The instruction fetch circuitry provides the MCBI to the decoder circuitry. In response, the decoder circuitry is configured to cause the multi-condition branch circuitry to execute the multi-condition branch instruction.