Physical Register File Segmentation for Variable-Size Register Mapping
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Solution Overview
Problem
Existing processor architectures face challenges in efficiently mapping variously sized logical registers to physical register files (PRFs) due to the increasing sizes and varying capacities of logical registers, leading to inefficiencies in resource allocation.
Innovation Solution
The implementation of a granular allocation mechanism that allows for the allocation of selectable portions of PRF entries to correspond to logical registers of varying capacities, utilizing a register alias table (RAT) and bitmap to manage and allocate sub-portions of PRF entries efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If physical register file entries are allocated to logical registers of varying sizes, then resource utilization is improved, but allocation complexity increases
Solution Approach 1:
The physical register file entries are segmented into multiple allocatable portions (e.g., first portion, second portion, third portion) that can be independently allocated to different logical registers. This segmentation enables fine-grained resource allocation matching the varying sizes of logical registers while maintaining manageable complexity through structured division of the register file space.
Solution Approach 2:
Different portions of the physical register file are assigned different allocation characteristics based on local requirements. Each portion can be allocated to different logical registers with specific size requirements, allowing optimized local resource utilization while maintaining overall system coherence through the register alias table.
2Productivity
If multiple logical registers map to the same physical register entry, then register renaming efficiency is improved, but mapping management complexity increases
Solution Approach 1:
A single physical register entry can serve multiple functions by being mapped to multiple different logical registers simultaneously. The physical register entry acts as a universal resource that can be dynamically assigned to different logical registers based on current execution needs, improving renaming efficiency while the register alias table manages the complexity of tracking these multi mappings.
Solution Approach 2:
The register alias table serves as an intermediary structure that mediates between logical registers and physical register entries. It maintains the mapping relationships, enabling efficient register renaming while abstracting away the management complexity by providing a centralized lookup mechanism for resolving logical to physical register mappings.
3Manufacturing precision
If granular allocation of PRF portions is implemented, then resource allocation precision is improved, but control mechanism complexity increases
Solution Approach 1:
The physical register file is divided into granular allocatable portions that can be precisely assigned to match the exact size requirements of different logical registers. This segmentation provides fine-grained control over resource allocation, improving precision by allowing partial entries to be allocated based on the specific capacity needs of each logical register type.
Solution Approach 2:
The allocation mechanism is dynamic, allowing the mapping between logical and physical registers to change based on current execution requirements. The system can adaptively allocate different portions of physical register entries to different logical registers, providing precise resource allocation that responds to varying workload demands while managing control complexity through the register alias table.
Data Source
AI summary
Techniques and mechanisms for allocating resources of a physical register file (PRF) each to correspond to a respective logical register. In an embodiment, a PRF comprises multiple physical registers (or “entries”) which each comprise a respective two or more minimum allocable sub-portions. For a given one such entry, the minimum allocable sub-portions of the entry are available to be allocated either individually or in combination with each other. Allocation of a given one or more sub-portions of a PRF entry enables functionality of a corresponding logical register with said one or more sub-portions. At a given time, logical registers of different respective capacities are implemented with corresponding entry portions of the same PRF. In another embodiment, a bitmap facilitates a search to identify an availability of one or more PRF entry portions for allocation to correspond to a logical register.