OSDT Weekly 第80期

近期活动

• 下周日有 OSDT Monthly Meetup，线上。欢迎报名演讲。

编译社区的八卦信息

GCC

• SVE back-end improvements: aarch64: Add support for unpacked SVE shifts https://gcc.gnu.org/pipermail/gcc-patches/2021-January/563247.html

• [PATCH 0/8] [RS6000] rs6000_rtx_costs V2 https://gcc.gnu.org/pipermail/gcc-patches/2021-January/563265.html

• [PATCH v4 00/29] libgcc: Thumb-1 Floating-Point Library for Cortex M0 https://gcc.gnu.org/pipermail/gcc-patches/2021-January/563175.html

• [PATCH] RISC-V: Zihintpause: add __builtin_riscv_pause https://gcc.gnu.org/pipermail/gcc-patches/2021-January/562968.html

• [committed] LRA: patch to fix PR97969 https://gcc.gnu.org/pipermail/gcc-patches/2021-January/563322.html

• [PATCH v2] aarch64: Add cpu cost tables for A64FX https://gcc.gnu.org/pipermail/gcc-patches/2021-January/563047.html

Binutils/GDB

• [PATCH 0/2] Enable PGO/LTO build in GDB https://sourceware.org/pipermail/binutils/2021-January/114846.html

• [PATCH] POWER10: Add Return-Oriented Programming instructions https://sourceware.org/pipermail/binutils/2021-January/114822.html

• [PATCH v4 0/8] RISC-V: Implement support for big endian targets https://sourceware.org/pipermail/binutils/2021-January/114772.html

• [PATCH v4 0/8] RISC-V: Implement support for big endian targets https://sourceware.org/pipermail/binutils/2021-January/114752.html

• GDB: [PATCHv6 0/2] Restore thread and frame patches https://sourceware.org/pipermail/gdb-patches/2021-January/174758.html

GLIBC

• [PATCH v3 0/5] fix ifunc with static pie [BZ #27072] https://sourceware.org/pipermail/libc-alpha/2021-January/121548.html

• [PATCH 0/3] Make glibc build with LLD https://sourceware.org/pipermail/libc-alpha/2021-January/121448.html

• Community Patch Review Meeting: 2021-01-11 at 0900h EST (UTC-5) https://sourceware.org/pipermail/libc-alpha/2021-January/121537.html

LLVM/Clang/LLDB/LLD

本节内容来自 LLVM Weekly 第367期， Alex Bradbury 大哥持续稳定输出。

• CMake performs well as LLVM's buildsystem, but can it more? What about Ray Tracing in pure CMake?. 有小伙伴研究这个么？

• Tom Stellard shared the proposed release schedule for LLVM 12, noting that an LLVM 11.1.0 release will be necessary. He also proposes a week-of-the-year based release schedule that an be used for all future releases, aiming to document current practice. The proposed branch date is January 26th.

• Stella Laurenzo shared an RFC on modernizing CMake LLVM's "Components" facility.

• Craig Topper proposed allowing scalable vectors in structs to support multiple return values from intrinsics. Respondents suggest that steps towards removing load/storephi on first class aggregates would be welcome.

• LLVM GPU News Issue #3 has now been published.

• Multiplication with a constant was optimised in the RISC-V backend. 55f0a1b.

• Exception handling instructions were added to the WebAssembly backend in line with a new specification. 9e4eade.

• Source-based coverage gained support for branch coverage. 9f2967b.

• LLVMType was removed from MLIR, and LLVM dialect types now derive Type directly. Additionally, LLVM dialect float types were replaced with builtins. c69c9e0, dd5165a.

• LLVM libc 继续日拱一卒。 993d8ac, 7f7b0dc, 4726bec.

RISC-V in China

• Seeed携BeagleBoard、赛昉科技发布RISC-V架构的第一款实用级Linux电脑 今天下午开的发布会。值得期待。

• RISC-V东亚时区双周会将在周五上午讨论 RVV Intrinsics API 的修改问题。

• PLCT实验室已经完成了 Zfinx 的一系列支持工作，等待回归测试的完善和 psABI 等相关事项的确定。

• PLCT实验室开始关注P扩展的实现现状。

RT-Thread 社区

• 中科蓝讯 RISC-V 内核芯片 AB32VG1 评估版 SDK已上架至RT-Thread Studio ，可根据DEMO文档体验 https://ab32vg1-example.readthedocs.io/zh/latest/rt-thread/wav_player.html#demo
• AI简报：技术宅硬核跨年，开源DIY墨水屏日历 https://mp.weixin.qq.com/s/0HbQ0GwsARtDEZXEahp6kw

TVM / MLIR / AI Compilers

• 风平浪静。

其它社区八卦

• This Week in Rust https://this-week-in-rust.org/blog/2021/01/06/this-week-in-rust-372/

• Golang Weekly: https://golangweekly.com/issues/344

• WebAssembly Weekly: https://wasmweekly.news/issue-141/

本周工具链岗位

往期社招及实习生招聘长期有效。

• 放假多无聊，来实习吧！
• 阿里淘系技术部招聘编译器技术专家（高级技术专家）
• PLCT实验室2021H1社招开启：来一起为RISC-V重新发明轮子吧！
• 荣耀招聘编译器与编程语言开发工程师
• 腾讯云招募编译器高级/专家工程师，具体可以本次推送的第二条消息。（猎头提供消息）

本周推荐阅读

本周推荐：《探路之役》

作者：萧冬连

现在我周围的同龄人，多数都是在大城市里，在软件行业从事工作，拿着超过全国劳动者平均水平的薪水，有的有股票，有的有期权。同时，要么在挤破头摇号购买新房，要么随着在拥挤的二手学区房市场挤来挤去。买房和加班成为我周围的伙伴的日常生活。

这一切在40年前是无法想象的。而现在，我们已经无法想象40年前是什么样子的。本书罗列了改革开放的头十几年的经济改革的过程。从顶层的视角和历史的视角，通过详尽的史料文献还原了改革开放之初的大大小小的决策过程。伟大的发现和成果往往收到起自身成功的影响，使得人们忽视和看低其伟大。中国过去几十年的发展亦是如此。

以往看书的时候我总是倾向于速读，跳着看，带着莫名的要增加阅读数量的焦虑感。这本书则让我很仔细的去寻找每一个名字，发现一些意外的惊喜。我惊讶的看到早在40年前，当今各个经济领域的一把手或决策者，在30岁出头的时候就已经挺身而出，为国家的重大决策建言献策。相比起来，就看到自身的惭愧和不努力。

当我在阅读这本书，看到一个又一个熟悉的名字的时候，我总是想起社科院马勇教授在「全球史观下的极简中国史」课程中强调的：让我们全球史观的视角，带着温柔和欣赏的眼光，去体会前人在他们的时代，做出的选择。