A 10-core SoC with 20 Fine-Grain Power Domains for Energy-Proportional Data-Parallel Processing over a Wide Voltage and Temperature Range

We present Thestral, a 10-core RISC-V chip for energy-proportional parallel computing manufactured in 22 nm FD-SOI technology. Thestral contains a control core and a nine-core compute cluster. Each core features a single-precision floating-point unit (FPU) and an integer processing unit (IPU) and implements custom instruction set architecture (ISA) extensions to improve utilization. The chip featu...