How lowRISC made its Ibex RISC-V CPU core faster https://peertube.watch/videos/watch/d851addc-824b-4f1b-8c51-a86fbfd12990 Using open source tools to improve an open source core Ibex implements RISC-V 32-bit I/E MC M-Mode, U-Mode and PMP. It uses an in order 2 stage pipe and is best suited for area and power sensitive rather than high performance applications. However there is scope for meaningful performance gains without major impact to power or area. This talk describes work done at lowRISC to analyse and improve the performance of Ibex. The RTL of an Ibex system is simulated using Verilator to run CoreMark and Embench and the traces analysed to identify the major sources of stalls within them. This informs where improvements should be targeted. The open source implementation tools Yosys and openSTA are used to assess potential timing and area impacts of these improvements. In this talk you’ll learn about the pipeline of Ibex, methods to analyse the performance of CPU microarchitecture and how to use Yosys and openSTA to analyse what limits clock frequency in a design. Speaker: Greg Chadwick, Track: RISC-V, Room: K.3.401, When: Saturday 1 February 2020, 10:30–10:50 (Brussels time), Schedule: FOSDEM 2020 event page, Slides & links Talk sides (slides), Ibex github repository, lowRISC website, Licence: Creative Commons Attribution 2.0 Belgium (CC BY 2.0 BE) (as stated in the FOSDEM video archive). Attribution: “How lowRISC made its Ibex RISC-V CPU core faster” by Greg Chadwick, FOSDEM 2020. Original recording: 2020/K.3.401/riscv_lowrisc.webm from the FOSDEM video archive. This channel is an unofficial mirror; FOSDEM is a free and non-commercial event organised by the community for the community. Wed, 21 Oct 2026 23:05:33 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.watch How lowRISC made its Ibex RISC-V CPU core faster https://peertube.watch/lazy-static/avatars/3b284627-b75f-409e-ac2e-10f4c2946f43.png https://peertube.watch/videos/watch/d851addc-824b-4f1b-8c51-a86fbfd12990 All rights reserved, unless otherwise specified in the terms specified at https://peertube.watch/about and potential licenses granted by each content's rightholder.