OSDT Weekly 第306期

近期活动

• 本周有 RISC-V 欧洲峰会。
• 6月7日有 PyTorch Day China，在北京。
• 6月10日有 AsiaLLVM，第一届，在东京。欢迎大家踊跃报名。

编译社区的八卦信息

GCC

• [PATCH] vect: Improve vectorization for small-trip-count loops using subvectors https://gcc.gnu.org/pipermail/gcc-patches/2025-May/683011.html

• [PATCH 0/9] AArch64: CMPBR support https://gcc.gnu.org/pipermail/gcc-patches/2025-May/683024.html

• [PATCH v3 1/2] RISC-V: Support RISC-V Profiles 20/22. https://gcc.gnu.org/pipermail/gcc-patches/2025-May/683100.html

• [PATCH v19 0/3] c: Add _Countof and <stdcountof.h> https://gcc.gnu.org/pipermail/gcc-patches/2025-May/683145.html

• [PATCH 0/6] RISC-V: frm state-machine improvements https://gcc.gnu.org/pipermail/gcc-patches/2025-May/683153.html

• [PATCH v1 0/7] RISC-V: Combine vec_duplicate + vsub.vv to vsub.vx on GR2VR cost https://gcc.gnu.org/pipermail/gcc-patches/2025-May/683246.html

BINUTILS

• [PATCH 1/2] RISC-V: Base for complex extension implications https://sourceware.org/pipermail/binutils/2025-May/140946.html

• [PATCH v2] RISC-V: Add zilsd & zclsd support https://sourceware.org/pipermail/binutils/2025-May/140949.html

• [PATCH v3 00/26] AArch64 AEABI build attributes (a.k.a. object attributes v2) https://sourceware.org/pipermail/binutils/2025-May/140972.html

• [PATCH 0/4] Fix two SFrame issues in gas https://sourceware.org/pipermail/binutils/2025-May/141014.html

• [PATCH v3 1/2] RISC-V: Add support for RISC-V Profiles 20/22. https://sourceware.org/pipermail/binutils/2025-May/141021.html

• [PATCH 1/2] RISC-V: check offsets when linker relaxation is disabled https://sourceware.org/pipermail/binutils/2025-May/141042.html

GDB

• [PATCHv2 0/7] include shared memory with id zero in core NT_FILE note https://sourceware.org/pipermail/gdb-patches/2025-May/217745.html

• [PATCH v3 00/11] Add CET shadow stack support https://sourceware.org/pipermail/gdb-patches/2025-May/217731.html

• [PATCH 0/2] Use check-mark for current row of CLI table https://sourceware.org/pipermail/gdb-patches/2025-May/217772.html

• [PATCH] RISC-V: Add software single step support for cm.popret[z] https://sourceware.org/pipermail/gdb-patches/2025-May/217889.html

GLIBC

• [PATCH 00/11] Add initial support for --enable-ubsan https://sourceware.org/pipermail/libc-alpha/2025-May/166363.html

• Implement C23 compoundn [committed] https://sourceware.org/pipermail/libc-alpha/2025-May/166441.html

• [PATCH v4 00/23] Handle ld.so with LOAD segment gaps in _dl_find_object (bug 31943) https://sourceware.org/pipermail/libc-alpha/2025-May/166513.html

LLVM/Clang/LLDB/LLD

本节内容来自 LLVM Weekly 第 593 期， Alex Bradbury 大哥持续稳定输出。

• 学起来：Recordings from EuroLLVM 2025 have started to be posted to YouTube.

• 收藏： My Igalia colleague Mikhail Gadelha has a blog post on work to improve RISC-V LLVM performance as compared to GCC, a project done through RISE and also summarised on their blog. Mikhail's SpacemiT X60 scheduling model patch was also mentioned on Phoronix.

• 有意思的分享： I talk about tech in general, LLVM Weekly and projects I've been involved in such as RISC-V, LLVM, lowRISC, Raspberry Pi, and work at Igalia on the latest episode of the TMPDIR podcast hosted by Khem Raj and Cliff Brake. Not so on-top for LLVM, but if you're interested in my computer setup enjoy scrolling through lots of Linux configuration notes you might like my blog post on the MiniBook X N150 - the netbook isn't dead (yet!). I also wrote up suite-helper, the helper script I split out to handle my most common tasks when building and diving into llvm-test-suite configurations - I'd highlight particularly the reduce-ll helper to llvm-reduce a target assembly snippet for a given .c input. Finally I'm presenting a talk about improvements to RISC-V vector code generation in LLVM at the RISC-V Summit Europe in Paris this week. If you're here, be sure to say hi!

• 有点意思： Reid Kleckner found that each class template instantiation in Clang costs about 1KiB of memory.

• LLVM社区有了社区经理： Britton Watson is seeking volunteers for the 2025 LLVM Developers' Meeting Program Committee and for the Student Travel Grant Review Committee.

• 贡献的机会来了： Alex Zinenko is trying to build a maintainer list for MLIR.

• 搞编译器也需要学AI了： S. VenkataKeerthy started a discussion on upstreaming support for generating IR2Vec embeddings into Machine Learning Guided Optimisation (MLGO) for inlining.

• 祝贺进迭时空： An initial scheduler model was added for the SpacemiT-X60 RISC-V CPU. 4eac576.

• RISC-V 的扩展的名字越来越复杂的： Initial code generation support was added for the RISC-V Zvqdotq (dot product) extension. 1ac489c.

• 时代的变迁： The last mentions of IRC were removed from LLVM's documentation, as it's not used by the community any more. 7548cec.

QEMU (RISC-V)

• [PATCH v5 00/26] target/riscv: SATP mode and CPU definition overhaul https://lists.nongnu.org/archive/html/qemu-devel/2025-05/msg02636.html

• [PATCH v2] target/riscv: support atomic instruction fetch (Ziccif) https://lists.nongnu.org/archive/html/qemu-devel/2025-05/msg01827.html

RISC-V in China

• 都去开 RISC-V 欧洲峰会去了。

RT-Thread 社区

• 2025 RT-Thread全球技术大会演讲征集开始啦。RT-Thread全球技术大会，由开源操作系统 RT-Thread 发起，并联合国内外领先企业的重磅嘉宾，携手国内外顶尖企业专家与线上参与者，共议边缘计算、嵌入式系统、AIoT、RISC-V及安全应用等前沿技术，激荡思维火花。想要报名的同学请访问 https://mp.weixin.qq.com/s/hFHUOBGoIC2r_8eDmVVqRQ。

• 当前 RT-Thread 仓库中 BSP 和 .git 内容占比约 90%，而 RT-Thread 核心代码及文档仅占约 100MB，约为 3%。为进一步优化用户体验，社区计划了对现有 BSP 结构进行改进优化，减少仓库的体积。具体参考 https://mp.weixin.qq.com/s/0RuR4A83ff77rM7l1ffEfQ。

AI Compilers

• 风平浪静。

本周工具链岗位

往期社招及实习生招聘长期有效。

• PLCT实验室春招 RISC-V 实习岗位汇总（2025年3月）｜甲辰计划开源实习生联合招聘培养
• openEuler RISC-V 实习机会暨OERV 实习岗位汇总｜RISC-V 与 Linux 发行版生态
• 大算力芯片公司招聘高级编译器研发工程师、GPU算法研发、集群互联开发等岗位

本周推荐阅读

本周推荐：《海象日记》

作者：乌冬

推荐：小编1号

这本书记录的是作者从怀孕开始到孩子满1岁的经历。作者并不是职业作家（至少怀孕的时候还不是），但是当生命中开始孕育另一个生命的时候，落笔的冲动充斥了身体。恰逢在孕育生命的同时，见证了长辈病危、生命逝去的恐惧和茫然。平日里眼睛里被忽略的日常、屋檐缝隙漏下的阳光，开始有了重新不同的意义。

每一个生命的孕育和哺育都是无二的，这也是为什么会有如此多的准妈妈准爸爸变成了作家、而这样的文字始终不乏读者。我们从他人的生活中，希望能够发现和看到这个世界的幸福；有时候，会更加幸运的看到自身周围的幸福。

阅读本书几页之后，我不知为何有了一种偷偷摸摸的感觉，总感觉像是无意间窥见了异性的日记，而字里行间的文字并未意识到自己会被其他的人看见。然后回到序言，哦，确实是日记。