Hardware-Assisted Heterogeneous ISA Dispatcher for Core Utilization
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Solution Overview
Problem
Existing processor architectures face challenges in efficiently utilizing heterogeneous instruction set architectures (ISAs) across different core types within a single system, leading to suboptimal performance and resource utilization due to the need for homogeneous ISA symmetry, which results in underutilization of more performant cores and inefficient workload distribution.
Innovation Solution
The implementation of a hardware-assisted heterogeneous ISA dispatcher enables dynamic switching between homogeneous and heterogeneous ISA states, allowing software to opportunistically migrate to more performant cores and utilize advanced instructions without relying on operating system management, through instructions like HIDENTER, HIDENTERMIGRATE, and HIDEXIT, and registers like IA32_HID_CTRL MSR and IA32_HID_STATUS MSR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If homogeneous ISA symmetry is enforced across all cores, then system reliability and ease of operation are improved, but productivity and resource utilization deteriorate due to underutilization of more performant cores
Solution Approach 1:
The patent applies local quality by allowing different instruction set architectures to be enabled on different cores based on their capabilities. The heterogeneous ISA dispatcher enables advanced ISA features on specific cores that support them while maintaining basic ISA compatibility across all cores, thus optimizing resource utilization without compromising system reliability.
Solution Approach 2:
The patent implements dynamics through the heterogeneous ISA dispatcher that dynamically determines at runtime which cores can execute advanced instructions. The system transitions from static homogeneous ISA enforcement to dynamic heterogeneous ISA allocation, allowing the processor to adaptively utilize available core capabilities for improved productivity.
2Adaptability or versatility
If heterogeneous ISA is implemented without hardware assistance, then adaptability is improved, but device complexity increases due to OS management requirements
Solution Approach 1:
The heterogeneous ISA dispatcher implements self-service by autonomously determining which cores support advanced ISA features and routing instructions accordingly, without requiring operating system intervention. The dispatcher independently manages the complexity of heterogeneous ISA coordination, reducing the burden on the OS while maintaining high adaptability.
Solution Approach 2:
The patent introduces an intermediary heterogeneous ISA dispatcher that mediates between the execution engine and diverse core types. This dispatcher layer simplifies the system by centralizing the complexity of heterogeneous ISA management, allowing cores to maintain their native capabilities while presenting a unified interface to software.
3Productivity
If advanced instructions are enabled on all cores, then productivity is improved, but reliability deteriorates due to execution errors on incompatible cores
Solution Approach 1:
The heterogeneous ISA dispatcher performs preliminary action by pre-determining which cores support advanced ISA features before instruction execution. The dispatcher queries core capabilities in advance and configures the execution environment accordingly, preventing execution errors by ensuring instructions are only dispatched to compatible cores.
Solution Approach 2:
The patent implements feedback through the dispatcher's capability detection mechanism that continuously monitors which cores support advanced ISA features. This feedback loop allows the system to dynamically adjust instruction routing based on actual core capabilities, maintaining high productivity while ensuring execution reliability by avoiding incompatible instruction-execution pairs.
Data Source
AI summary
Systems, methods, and apparatuses to support instructions for a hardware assisted heterogeneous instruction set architecture dispatcher are described. In one embodiment, a hardware processor includes a plurality of processor cores comprising a first type of processor core that supports a first instruction set architecture and a second type of processor core that supports a second different instruction set architecture, a decoder circuit of a processor core of the plurality of processor cores to decode a single instruction into a decoded single instruction, the single instruction including a field that identifies a requested core type and an opcode that indicates an execution circuit of the processor core is to: read a register to determine a core type of the processor core, cause the processor core to enter a first mode, that only permits execution of the first instruction set architecture by the processor core, when the requested core type and the core type of the processor core are the first type, cause the processor core to enter a second mode, that only permits execution of the second different instruction set architecture by the processor core, when the requested core type and the core type of the processor core are the second type, cause the processor core to enter a third mode, that only permits execution of the first instruction set architecture by the processor core, when the requested core type is the second type and the core type of the processor core is the first type, and cause the processor core to enter a fourth mode, that only permits execution of the second different instruction set architecture by the processor core, when the requested core type is the first type and the core type of the processor core is the second type, and the execution circuit of the processor core to execute the decoded single instruction according to the opcode.