Register Mapping Circuitry for Multi-Mode Physical Register Allocation
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Solution Overview
Problem
Existing data processing apparatuses face challenges in efficiently managing different register lengths for architectural registers across various processing modes, leading to increased circuit area and power consumption.
Innovation Solution
The apparatus includes mode change detection circuitry to identify switches between processing modes with different register lengths and register mapping circuitry that maps architectural registers to corresponding physical registers in either of two separate physical register files, depending on the processing mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single physical register file is used to support multiple processing modes with different register lengths, then the device complexity is reduced, but the circuit area and power consumption increase due to the need to accommodate the largest register length in all modes
Solution Approach 1:
The physical register file is divided into multiple separate register files, each dedicated to a specific processing mode with a specific register length. The mode change detection circuitry detects when the processor switches between modes, and the register mapping circuitry redirects register access to the appropriate physical register file segment, ensuring that only the required register length is allocated at any given time.
Solution Approach 2:
The system dynamically switches between different physical register files based on the current processing mode. The mode change detection circuitry monitors mode transitions and triggers the register mapping circuitry to update the physical register file selection, allowing the register allocation to adapt dynamically to the actual processing requirements rather than being statically configured for the maximum possible register length.
2Adaptability or versatility
If a single physical register file is designed to accommodate the largest register length, then all processing modes can be supported, but power consumption increases due to the larger circuit area
Solution Approach 1:
The physical register file is segmented into multiple smaller register files, each optimized for a specific register length and processing mode. This segmentation ensures that only the necessary circuit area is activated for the current mode, reducing power consumption compared to a single large register file that would need to accommodate all possible register lengths.
Solution Approach 2:
Each physical register file is designed to serve a specific processing mode, creating a many-to-one relationship where multiple register files collectively provide universal support for all processing modes. The mode change detection and register mapping circuitry enable these specialized register files to work together as a unified system that adapts to different processing requirements.
3Area of stationary object
If separate physical register files are used for different processing modes, then circuit area and power consumption are reduced, but the device complexity increases due to mode change detection and register mapping circuitry
Solution Approach 1:
The mode change detection circuitry and register mapping circuitry act as intermediary components that bridge the gap between the processor core and the multiple physical register files. These intermediaries handle the complexity of mode detection and register file selection, allowing the processor core to operate with simplified register access logic while the intermediary circuitry manages the complexity of coordinating between multiple physical register files.
4Productivity
If register mapping is dynamically adjusted based on processing mode, then register allocation efficiency is improved, but the difficulty of detecting and measuring mode changes increases
Solution Approach 1:
The mode change detection circuitry continuously monitors the processor state for mode change indicators and provides feedback to the register mapping circuitry. When a mode change is detected, the system activates the appropriate physical register file and updates the register mapping accordingly, ensuring that register allocation efficiently matches the current processing mode while maintaining simple detection logic through dedicated mode change indicator monitoring.
Data Source
AI summary
Mode change detection circuitry detects a mode change when processing circuitry switches between first and second modes of processing in which a first set of architectural registers are designated as having different register lengths. Register mapping circuitry maps architectural registers to corresponding physical registers. For an operation specifying a given architectural register of the first set of architectural registers: in response to a determination that the operation is to be processed in the first mode of processing, the register mapping circuitry maps the given architectural register to a physical register of a first physical register file, and in response to a determination that the operation is to be processed in the second mode of processing, the register mapping circuitry maps the given architectural register to a physical register of a second physical register file separate from the first physical register file and having physical registers of different register length to physical registers of the first physical register file.