Switch Instruction Circuit for Readable Assembly Branching
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Solution Overview
Problem
Existing processors lack a straightforward and efficient mechanism to handle switch instructions in assembler code, making programming cumbersome and difficult to optimize, especially for specialized processors without compilers.
Innovation Solution
A processor is equipped with a switch instruction circuit (SIC) that detects and executes switch instructions, allowing for direct handling of switch instructions without the need for complex series of conditional jumps, improving readability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If switch instructions are handled using traditional conditional jump sequences, then the processor can execute switch logic, but the assembly code becomes cumbersome, difficult to read, and requires many jump instructions
Solution Approach 1:
The patent introduces a dedicated switch instruction circuit (SIC) as an intermediary component between the instruction fetch circuit and decode circuit. This SIC specifically handles switch instructions by detecting them and generating appropriate jump signals, thereby mediating the complexity between the general-purpose instruction pipeline and the specific switch instruction handling requirements.
Solution Approach 2:
The patent extracts the switch instruction handling functionality from the general instruction decode and execution path by creating a separate switch instruction circuit. This extraction allows switch instructions to be processed through a specialized path that directly generates jump signals without going through the standard conditional jump sequence generation, simplifying both the instruction writing and execution.
2Productivity
If compilers generate optimized jump sequences for switch instructions, then execution efficiency improves, but specialized processors without compilers cannot benefit from this optimization
Solution Approach 1:
The switch instruction circuit enables processors to self-optimize switch instruction execution without requiring external compiler intervention. The SIC is hardwired to recognize switch instructions and automatically generate the appropriate jump sequences, allowing the processor itself to provide the optimization that would otherwise require a clever compiler.
Solution Approach 2:
The SIC acts as an intermediary that bridges the gap between simple processor architecture and optimized execution. It intercepts switch instructions in the instruction stream and provides specialized handling, making advanced execution efficiency available to processors regardless of whether they have sophisticated compilers.
3Speed
If a dedicated switch instruction circuit is added to the processor, then switch instruction execution becomes faster and more readable, but the processor structure becomes more complex
Solution Approach 1:
The patent segments the instruction processing pipeline by creating a dedicated switch instruction circuit that operates in parallel with the main decode path. This segmentation allows switch instructions to be handled through a specialized fast path while other instructions continue through the standard pipeline, achieving speedup without completely redesigning the processor structure.
Solution Approach 2:
The switch instruction circuit is designed to work within the existing processor architecture, interfacing with standard components like the instruction fetch circuit, decode circuit, and program counter. By being compatible with and integrated into the universal processor structure, it provides specialized functionality without creating an entirely separate system.
Data Source
AI summary
In one implementation a processor has an instruction fetch circuit fetching instructions, the instruction fetch circuit having an input and an output and a decode circuit to decode the fetched instructions, the decode circuit having a first and second input, and an output, wherein the decode circuit first input is coupled to the instruction fetch circuit output receiving the fetched instructions, and an execution circuit executing the decoded fetched instructions, the execution circuit having an input coupled to the decode circuit output to receive the decoded fetched instructions, and a switch instruction circuit (SIC) to detect and execute switch instructions of the fetched instructions, the SIC having an input and an output, wherein the SIC input is coupled to the instruction fetch circuit output to receive the fetched instructions, wherein the SIC output is coupled to the decode circuit second input and the instruction fetch circuit input.