2022-07-27.md

OSDT Weekly 2022-07-27 第160期

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近期活动

编译社区的八卦信息

• C++ 动态新闻推送 第72期 https://zhuanlan.zhihu.com/p/546490359

GCC

• State of AutoFDO in GCC https://gcc.gnu.org/pipermail/gcc/2022-July/239183.html

• Palmer work for Rivos, 该公司聚焦高性能RISC-V核，Vector扩展对其至关重要，可以预见Rivos会是RVV的重要参与者 Supporting RISC-V Vendor Extensions in the GNU Toolchain https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598618.html

• [RFC] Function Multi Versioning on Arm https://gcc.gnu.org/pipermail/gcc/2022-July/239134.html

• [PATCH v2 0/3] LoongArch: Modify the method of obtaining symbolic addresses. https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598633.html

  nice doc！ [PATCH][wwwdocs] gcc-13: Add loongarch '-mexplicit-relocs' support https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598820.html

• [RFC] Teach vectorizer to deal with bitfield reads https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598824.html

• [PATCH] RISC-V: Standardize formatting of SFB ALU conditional move https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598854.html

Binutils/GDB

• PowerPC版SVE？ [PATCH v6 0/7] ppc/svp64: support SVP64 and its first insns https://sourceware.org/pipermail/binutils/2022-July/122004.html

• 依托计算所强大的博士生资源，LoongArch toolchain开发越来越活跃 [PATCH v2 0/6] Add new relocations for LoongArch. https://sourceware.org/pipermail/binutils/2022-July/121933.html

• [PATCH v4 0/4] RISC-V: Combined floating point enhancements https://sourceware.org/pipermail/binutils/2022-July/121981.html

• GDB:[PATCH v2 0/4] Smart pointer wrapper for frame_info https://sourceware.org/pipermail/gdb-patches/2022-July/190594.html

GLIBC

• LoongArch GLIBC即将合入 [PATCH v7 00/13] GLIBC LoongArch PATCHES https://sourceware.org/pipermail/libc-alpha/2022-July/140973.html

• RFC: malloc fastbin concurrency bug https://sourceware.org/pipermail/libc-alpha/2022-July/140834.html

• 对服务器workload有一定的影响 [RFC] futex2: add NUMA awareness https://sourceware.org/pipermail/libc-alpha/2022-July/140686.html

LLVM/Clang/LLDB/LLD

本节内容来自 LLVM Weekly 第 447 期， Alex Bradbury 大哥持续稳定输出。

• 想去啊： The next LLVM Bay Area meetup will take place on Mon August 8th.

• 出生即巅峰了： Carbon, an "experimental successor to C++" (using LLVM of course) was announced in a CppNorth keynote.

• 有伙伴看过么？ JeanHeyd Meneide blogged about what went in to getting #embed into C23.

• 啊，其实我挺喜欢 Pha 的…… On behalf of the LLVM Foundation Board of Directors, Tom Stellard announced the decision to migrate to GitHub Pull Requests for code review. The planning transition date is not until October 1, 2023. "Despite the challenges, we need to get off of Phabricator, and the “must have” developer workflows are already supported by GitHub. We don’t feel that the remaining deficiencies with GitHub Pull Requests overcome benefits of moving to Pull Requests have - but we do think it is important to try to improve the workflows and know it is important to give time for auxiliary workflows to adapt. To do this, we set the target transition date to October 1, 2023. Allowing over a year should provide enough time to adapt, and time to find workarounds/solutions for at least some of the deficiencies that remain." A large number of responses were generated, discussing the pros/cons of the move and the feasibility of other options.

• 一大步： Amara Emerson proposed enabling GlobalISel for all optimisation levels for Apple AArch64 platforms. Although there are still fallbacks from GlobalISel to SelectionDAG, this would be a major milestone for the GlobalISel infraastructure. Amara reports that Apple benchmarks show generated code performance within about 1% of the SelectionDAG geomean.

• 要来了： The LLVM 15 release branch is due to be created imminently, on Tue the 26th.

• LLVM GPU News #38 is out.

• zstd was added to the llvm::compression namespace. e939bf6.

• The x86 backend now generated a zero-extending byte load when possible except when compiling with -Os/-Oz. f0dd12e.

• 小改进很多： Various minor codegen optimisations were made for RISC-V. 7c0b9b3, d7f2a63, 0b02752, 31b8939.

• 是ksyx！ Support for the RISC-V Zmmul extension was added. 3198364.

QEMU (RISC-V)

• [PATCH v6 0/5] RISC-V Smstateen support, https://lists.gnu.org/archive/html/qemu-riscv/2022-07/msg00175.html

• [PATCH v6 0/3] Implement Sstc extension, https://lists.gnu.org/archive/html/qemu-riscv/2022-07/msg00184.html

• [PATCH] hw/intc: sifive_plic: Fix multi-socket plic configuraiton, https://lists.gnu.org/archive/html/qemu-riscv/2022-07/msg00191.html

• [PATCH v5 0/1] target/riscv: Add Zihintpause support, https://lists.gnu.org/archive/html/qemu-riscv/2022-07/msg00196.html

• [PATCH] target/riscv: Ensure opcode is saved for every instruction, https://lists.gnu.org/archive/html/qemu-riscv/2022-07/msg00210.html

• [PATCH v11 0/6] Improve PMU support, https://lists.gnu.org/archive/html/qemu-riscv/2022-07/msg00213.html

RISC-V in China

• 第二届 RISC-V 中国峰会的作者通知已经发出，预期下周就会公开议程并开始观众报名。
• 国内 openKylin 发布 v0.7 版本，首发包含了 x86 和 RISC-V 架构，这可能是第一次在操作系统发行版领域 RISC-V 跑在了 Arm64 前面 :)

RT-Thread

• 【AI简报20220722期】STM32N6首款带有NPU的MCU即将问世、详解自动驾驶汽车
• 砺夏行动｜源启数字化直播周，RT-Thread与您本周四下午见！

TVM / MLIR / 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。

• DynamoRIO RISC-V 移植开发实习生招聘（PLCT实验室）
• PLCT实验室开始招募 Mono 系统开发实习生，负责 RISC-V 移植及优化
• PLCT实验室长期招募安卓系统（AOSP）开发实习生，升级和维护 AOSP for RISC-V 开源项目
• 瀚博半导体---编译器岗(AI/GPU类)火热开放中
• Intel 招聘 Compiler Engineer 和 Compiler Validation Engineer（上海）
• 大疆芯片部门招募编译器、模拟器、调度框架方向高级工程师
• PLCT实验室 libcxx-simd 项目实习生招聘
• 地平线-编译器研发工程师（北京/上海）
• RISC-V操作系统团队招聘测试工程师
• (远程/上海)Marvell DPU 部门招聘编译器研发
• (上海) 编译器开发工程师 - 芯旺微电子
• 平头哥AI芯片部编译及工具链团队招聘 - 校招+社招
• (腾讯)编译器高级研发工程师 （北京/上海/杭州/深圳）

本周推荐阅读

本周推荐：《未来简史》

作者: [以色列] 尤瓦尔·赫拉利

译者: 林俊宏

推荐: 小编1号

对于太过流行的图书，小编1号有一种本能的远离，害怕由于周围的热度进入阅读，却因为书中的内容不够深刻而感觉浪费了生命。《未来简史》就是我曾经认为“过于流行”的一本书。到了2022年，这本书已经比较少被谈论起，小编1号终于捧起这本接近400页的书。

很难说内容有超过小编1号过去阅读的前沿性，是一份对可能影响人类未来的几个大类技术的介绍。问题写的非常好，而且尽可能的通俗易懂。我理解也认可这本书的流行是合理的。

从我个人的角度有一点伤感的是，通过作者的描述，让我回想起来这些曾经的技术前沿和不确定性我在年轻的时候都学习过，有的甚至比较深入的“钻研”过。但是现在已经随着工作和生活的固定，已经很久没有抬头看过广袤宇宙的无限未知了。

这个暑假，自学一门新的专业吧。