Register Z-Bit Handling for Bit-Width Instruction Transitions
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Solution Overview
Problem
Processor resource consumption is high when transitioning between different bit-width instructions due to conventional methods of ensuring data coherency, which involves transferring data to memory and resetting register values, leading to inefficiencies in processing.
Innovation Solution
Employing a set of bits, referred to as Z-bits, to indicate the value of register portions, allowing the processor to conserve resources by maintaining the actual value of registers when transitioning between instruction types without changing the register contents, thus suppressing unnecessary data transfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the processor transfers data to memory and resets register values to ensure data coherency during bit-width transitions, then data coherency is maintained, but processor resource consumption increases
Solution Approach 1:
The patent creates a logical copy of the register state through the Z-bit indicator rather than physically transferring data to memory. The Z-bit serves as a lightweight representation that indicates whether register portions contain valid data, eliminating the need for costly data transfers while maintaining data coherency information.
Solution Approach 2:
The patent changes the parameter representation from actual data values to a simplified state indicator (Z-bit). By transitioning from storing full register contents to storing only a single bit that indicates data validity, the system maintains the necessary information for data coherency while dramatically reducing resource consumption.
2Reliability
If the processor transfers data to memory during bit-width transitions, then data coherency is ensured, but processing efficiency decreases
Solution Approach 1:
Instead of transferring actual data to memory, the patent creates a logical indicator (Z-bit) that represents the data state. This copying approach maintains the essential information needed for data coherency while avoiding the time-consuming data transfer operations that reduce processing efficiency.
Solution Approach 2:
The patent performs preliminary action by setting the Z-bit to indicate the data state before any potential data transfer is needed. This advance preparation eliminates the need for subsequent data transfer operations during bit-width transitions, thereby maintaining processing efficiency.
3Reliability
If the processor resets register values to zero during bit-width transitions, then data coherency is maintained, but unnecessary data transfers occur
Solution Approach 1:
The patent extracts only the essential information needed for data coherency (the data validity state) from the full register contents. By taking out just the critical information and representing it with a single Z-bit, the system eliminates unnecessary data transfers while maintaining data coherency.
Solution Approach 2:
The patent changes the parameter from actual register data values to a simplified validity indicator. This parameter transformation allows the system to track data coherency state without performing unnecessary data transfers or resets, as the Z-bit efficiently represents whether register portions contain valid data.
Data Source
AI summary
A processor employs a set of bits to indicate values of portions of registers of a register file. In response to a specified instruction indicating an expected change of instruction types to be executed, the processor sets one or more of the bits and, for subsequent instructions, interprets corresponding portions of the registers as having a specified value (e.g., zero). By employing the set of bits to set the values of the register portions, rather than setting the individual portions of the registers to the specified value, the processor conserves processor resources (e.g., power) when the processor transitions between executing instructions of different types.