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[llvm-dev] LLVM + RISC-V Meetup July 5th 2020

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Hi all,

FYI all slides are now available at [1]. We thank Bin Meng for providing
both English[2] and Chinese versions.
The LLVM + RISC-V meetup notice could be found here [3]. We also thank
Shanghai RISC-V group for online registration [4].


- Meng Wang - implement snapshot feature for Spike RISC-V simulator
- MaskRay - GCov implementations in Clang
- Bin Meng - VxWorks on RISC-V: What we've learned about LLVM RISC-V
toolchain
- Ying Chen - Custom ISA Support Using LLVM: XuanTie C910 as an example



[1]
https://github.com/hellogcc/OSDT-Slides/tree/master/20200705-LLVM-RISC-V-Meetup
[2]
https://github.com/hellogcc/OSDT-Slides/blob/master/20200705-LLVM-RISC-V-Meetup/VxWorks%20on%20RISC-V%20-%20What%20we've%20learned%20about%20LLVM%20RISC-V%20toolchain%20(English%20Edition).pdf
[3]
https://github.com/hellogcc/osdt-weekly/blob/master/events/2020-07-05-LLVM%2BRISC-V-meetup.md
[4] https://www.meetup.com/shanghai-riscv/

On Fri, Jul 3, 2020 at 1:49 PM Wei Wu (吴伟) <lazyparser at gmail.com> wrote:

> Hi all,
>
> OSDT社区组织的 LLVM + RISC-V 技术讨论会将在7月5日周日上午10点开始。本次讨论的议题已经确定，活动形式采用线上 Zoom
> 会议 + B站直播的形式，欢迎国内外的小伙伴参与。报告以中文为主。
>
> The next OSDT Meetup will happen on July 5th, 2020. The location is
> webinar style, using Bilibili live streaming and Zoom Meeting. Topics
> cover RISC-V software porting / enhancement and LLVM toolchain family.
> Talks are given in Chinese language.
>
> 本次活动由OSDT开源开发工具社区（含HelloGCC、HelloLLVM）与 Shanghai RISC-V Group
> 联合组织。感谢中科院软件所智能软件研究中心（ISRC）提供 Zoom 会议支持。
>
> We thank Shanghai RISC-V Group for event organization and I.S.C.A.S.
> for Zoom support
> . This meetup is hold by OSDT community (formerly HelloGCC and
> HelloLLVM communities).
>
> ## 活动时间 / Time
>
> 2020年7月5日 周日 10:00 AM - 12:00 AM
>
> Sunday, July 5, 2020 at 10:00:00 am    CST    UTC+8 hours Shanghai
>
> Saturday, July 4, 2020 at 7:00:00 pm    PDT    UTC-7 hours Las Vegas
> (USA - Nevada)
>
> Sunday, July 5, 2020 at 02:00:00 Corresponding UTC (GMT)
>
> ## 活动议程 / Program
>
> - 开场介绍（吴伟 as MC）
> - Opening - Wei Wu (chair)
>
> - 蒙斌 - VxWorks on RISC-V: 切换 LLVM 编译器遇到的一些问题分享
> - Bin Meng - VxWorks on RISC-V: What we've learned about LLVM RISC-V
> toolchain
>
> - MaskRay - Clang 的 gcov 实现
> - MaskRay - GCov implementations in Clang
>
> - 王萌 - Spike模拟器Snapshot功能技术方案及实现分享
> - Meng Wang - implement snapshot feature for Spike RISC-V simulator
>
> - 陈影 - 基于LLVM实现RISC-V用户自定义指令支持——以玄铁C910处理器为例
> - Ying Chen - Custom ISA Support Using LLVM: XuanTie C910 as an example
>
> - 自由话题讨论
> - Free discussion
>
> **蒙斌 - VxWorks on RISC-V: 切换 LLVM 编译器遇到的一些问题分享**
>
> Bin Meng - VxWorks on RISC-V: What we've learned about LLVM RISC-V
> toolchain
>
> 分享 VxWorks 操作系统在支持 RISC-V 架构从 GCC 编译器切换到 LLVM 过程中遇到的各种“坑”.
>
> In this talk we will share our lessons learned in the transition of
> using LLVM RISC-V toolchain to build VxWorks Operation System.
>
> 演讲者蒙斌来自风河系统中国研发中心，VxWorks 产品部门高级研发经理。开源社区积极参与者和贡献者，RISC-V 坚定的推广者 :)
>
> Bin Meng is from WindRiver. He is the senior R&D manager in VxWorks
> Department. Bin is very active tech promoter for RISC-V and other open
> source communities.
>
> **MaskRay - Clang 的 gcov 实现**
>
> MaskRay - GCov implementations in Clang
>
> GCC提供 gcov 用于实现code coverage。本次主题浅析clang对它的兼容实现和最近本人的一些改进。
>
> gcov is a code coverage tool which originated from GNU GCC. In this
> talk MaskRay will introduce the gcov implementation in Clang, with a
> few new improvements realized by him.
>
> MaskRay，一个活跃的LLVM开发者 (LLD+binary utilities 维护者，缓慢学习
> clang/middle-end/CodeGen)，退休的Algo/CTF/Student Cluster Competition 选手 /
> emacs-lsp 维护者。ccls++🎉
>
> MaskRay is an active LLVM developer (maintains LLD + Binary Utilities,
> learning clang/middle-end/codegen slowly), a retired Algo / CTF /
> Student Cluster Competition athlete / emacs-lsp maintainer. ccls++🎉
>
> **王萌：Spike模拟器snapshot功能技术方案及实现分享**
>
> Meng Wang - implement snapshot feature for Spike RISC-V simulator
>
> Spike 是用于验证RISC-V程序的模拟器，使用 C++ 编写，提供了模拟一个或多个 RISC-V hart
> 的功能模型。我们在spike的基础上进行开发，为其实现 snapshot
> 即快照功能，用于程序状态的保存及恢复。目前，我们已经完成了部分功能开发，本次报告将针对其技术方案和具体实现进行介绍。
>
> Spike is a simulator for RISC-V. We are implementing a few new
> features for Spike. In this talk, we will share details of our ongoing
> work for snapshot feature.
>
> 王萌，武汉大学大二和大三之间，PLCT实验室模拟器分支LV3实习生。指导老师：PLCT实验室李威威主管。
>
> 同时我们感谢中科院信工所宋威老师提出并完善了 snapshot 功能需要达到的各项功能指标。
>
> Meng Wang is an undergraduate from Wuhan University. He is currently
> working with his intern mentor Weiwei Li in PLCT Lab as intern.
>
> We thank Dr. Wei Song from IIE. The idea was provided by Dr. Song.
>
> **陈影：基于LLVM实现RISC-V用户自定义指令支持——以玄铁C910处理器为例**
>
> Ying Chen - Custom ISA Support Using LLVM: XuanTie C910 as an example
>
>
> 基于LLVM框架，说明如何实现其中RISC-V后端的用户自定义指令的支持，并以玄铁C910处理器为例，具体说明如何在LLVM中添加其扩展指令集的支持。玄铁
>
> C910的指令集架构是在RISC-V标准指令集架构的基础上，增加了部分自定义指令，以提高处理器性能，这部分扩展指令集主要包括有Cache指令子集，同步指令子集，算术运算指令子集，位操作指令子集以及存储指令子集。本次报告阐述的主要工作就是如何RISC-V后端实现这些扩展指令的支持。具体工作内容包括：为LLVM的RISCV后端添加一个C910命令行选项，实现llvm-mc汇编器的支持，使用TableGen语言编写全部扩展指令的汇编代码，能够将玄铁C910汇编指令汇编生成二进制文件，并编写测试用例，验证汇编指令编码的正确性。本项目对于在LLVM中添加用户自定义指令具有良好的指导意义，未来计划考虑添加对其他指令集架构的支持。
>
> We have implemented an open source toolchain for XuanTie C910. In this
> talk Ying Chen will give a short tutorial about custom ISA support
> using LLVM. source code could be download or viewed at:
> https://github.com/isrc-cas/c910-llvm
>
> 陈影，就读于合肥工业大学计算数学专业，研究生在读，目前在中科院软件所PLCT实验室实习。指导老师PLCT实验室邢明杰高级工程师。
>
> Ying Chen is a graduate from Hefei University of Technology. She is an
> intern in PLCT lab. Mingjie Xing is her intern mentor.
>
> ## 直播观看（永久地址，可收藏）
>
> https://live.bilibili.com/10339607
>
> 不需要报名，直接看。如果有B站账号，登陆之后可以进行弹幕提问。
>
> Anyone who has internet access could watch this meetup using Bilibili
> live streaming.
>
> Login users could post questions using DanMu feature.
>
> ## 通过 Zoom 参加
>
> 我们将在会议当天上午通过 HelloGCC 公众号（搜索
> hellogcc2007）发布会议信息。请通过负责人微信或HelloGCC公众号与我们联系，获取Zoom会议室信息。没有微信的朋友请通过
> lazyparser at gmail.com 跟我联系，请在邮件标题中体现本次活动信息以免被垃圾邮件过滤。
>
> Please drop an email to Wei Wu (lazyparser at gmail.com) for Zoom ID
> (and passcode).
>
> ## 演讲报名
>
> 目前仍可以进行闪电演讲，请联系OSDT社区负责人吴伟报名。直接负责人微信报名或通过 lazyparser at gmail.com 后台留言。
>
> Lightning talks are welcome. Please contact Wei Wu if you want to give a
> talk.
>
> --
> Best wishes,
> Wei Wu (吴伟)
>


-- 
Best wishes,
Wei Wu (吴伟)
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