Computer
Single-ISA Heterogeneous Multi-Core Architectures: The Potential for Processor Power Reduction
Proceedings of the 36th annual IEEE/ACM International Symposium on Microarchitecture
Core fusion: accommodating software diversity in chip multiprocessors
Proceedings of the 34th annual international symposium on Computer architecture
Federation: repurposing scalar cores for out-of-order instruction issue
Proceedings of the 45th annual Design Automation Conference
Amdahl's Law in the Multicore Era
Computer
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This paper proposes a reconfigurable multi-core architecture, called hyperscalar that enables many scalar cores to be united dynamically as a larger superscalar processor to accelerate a thread. To accomplish this, we propose the virtual shared register files (VSRF) that allow the instructions of a thread executed in the united cores to logically face a uniform set of register files. We also propose the instruction analyzer (IA) with the capability of detecting and tagging the dependence information to the newly fetched instructions. According to the tags, instructions in the united cores can issue requests to obtain their remote operands via the VSRF. The reconfigurable feature of hyperscalar can cover a spectrum of workloads well, providing high single-thread performance when TLP is low and high throughput when TLP is high. Simulation results show that the a 8-core hyperscalar chip multiprocessor's 2, 4, and 8-core-united configurations archive 94%, 90%, and 83% of the performance of the monolithic 2, 4, and 8-issue out-of-order superscalar processors with lower area costs and better support for software diversity.