VRoom! RISC-V CPU

A new high-end RISC-V implementation

Paul Campbell - Feb 2023

paul@taniwha.com @moonbaseotago

(C) Copyright Moonbase Otago 2021-23

Executive summary

• Very high end RISC-V implementation – goal cloud server class
• Out of order, super scalar, speculative
• RV64-IMAFDCHBK(V)
• Up to 8 IPC (instructions per clock) peak, goal ~4 average on ALU heavy work, already past there
• 2-way simultaneous multithreading capable
• Multi-core
• Current dhrystone numbers: ~11.3 DMips/MHz - still a work in progress.
• Currently boots Linux on an AWS-FPGA instance
• GPL3 – dual licensing possible

Detailed architectural presentation