OSDT Weekly 第102期

近期活动

下周，第一届 RISC-V 中国峰会就开始啦！

编译社区的八卦信息

GCC

• GCC Mission Statement https://gcc.gnu.org/pipermail/gcc/2021-June/236315.html

  Mission Statement https://gcc.gnu.org/pipermail/gcc/2021-June/236326.html

• Aligning stack offsets for spills https://gcc.gnu.org/pipermail/gcc-patches/2021-June/572102.html

• [PATCH 0/6] auto_vec copy/move improvements https://gcc.gnu.org/pipermail/gcc-patches/2021-June/572733.html

• [RFA] Minor improvement to compare elimination https://gcc.gnu.org/pipermail/gcc-patches/2021-June/572634.html

• [PATCH 0/3]: C N2653 char8_t implementation https://gcc.gnu.org/pipermail/gcc-patches/2021-June/572022.html

• [PATCH 1/2] arm: Auto-vectorization for MVE: vclz https://gcc.gnu.org/pipermail/gcc-patches/2021-June/thread.html#start

Binutils/GDB

• [PATCH 0/3] x86: another take at PC16 reloc overflow checking https://sourceware.org/pipermail/binutils/2021-June/116954.html

• [PATCH 0/6] x86: further value overflow diagnostic adjustments https://sourceware.org/pipermail/binutils/2021-June/116932.html

• GDB: ANNOUNCEMENT: ChangeLog policy change after GDB 11 https://sourceware.org/pipermail/gdb-patches/2021-June/179872.html

• GDB: [PATCH v2 00/12] Extensions for PTWRITE https://sourceware.org/pipermail/gdb-patches/2021-June/179908.html

• GDB: [PATCH v2 00/16] Interrupting programs that block/ignore SIGINT https://sourceware.org/pipermail/gdb-patches/2021-June/179940.html

GLIBC

• very fun，两位Indian互撕，IIT的瞧不起IIT落榜的。。。 Your toxic comments. https://sourceware.org/pipermail/libc-alpha/2021-June/127556.html

  Unacceptable behaviour by Amit Choudhary https://sourceware.org/pipermail/libc-alpha/2021-June/127564.html

  起源: [Final testing with benchmark tests] Fastest String Search Algorithm. https://sourceware.org/pipermail/libc-alpha/2021-June/127549.html

• [PATCH v3 0/4] arm64: Enable BTI for the executable as well as the interpreter https://sourceware.org/pipermail/libc-alpha/2021-June/127590.html

• [RFC][PATCH v11 0/7] Implementation of RTLD_SHARED for dlmopen https://sourceware.org/pipermail/libc-alpha/2021-June/127440.html

• [PATCH 0/6] More NPTL fixes https://sourceware.org/pipermail/libc-alpha/2021-June/127505.html

• [PATCH 0/4] Do not install shared objects under versioned names https://sourceware.org/pipermail/libc-alpha/2021-June/127473.html

LLVM/Clang/LLDB/LLD

本节内容来自 LLVM Weekly 第389期， Alex Bradbury 大哥持续稳定输出。

• Inspired by the recent thread on introducing a 'byte' type to LLVM IR, Nicolai Hähnle blogged about the challenges of implementing memcpy in LLVM IR

• The competition to build Clang and LLVM in the fastest time possible continues, with Takumi Nakamura demonstrating a build in under 60s on the AWS c5a.24xlarge.

• Herb Sutter wrote up a trip report from the Summer 2021 ISO C++ standard meeting.

• Reid Kleckner kicked off an RFC thread on revisiting the LLD-as-a-library design. There is broad support for making LLD usable as a library, with a few concerns about how this might impact the work-in-progress MachO linker.

• Chris Lattner shared some thoughts about the recent blog post on design issues in LLVM IR.

• Sameer Sahasrabuddhe responded to the previous thread about abstracting over SSA form IRs to implement generic analyses with some statistics on the performance cost of introducing virtual calls.

• A new option was added to the CFGPrinter to hide 'cold' blocks from the emitted graph. 9197bac.

• LLVM's Sequence type is now reverse-iterable. e056903.

• The C++ P1099 "using enum" proposal was implemented. 012898b, b2d0c16.

• The OpenMP #pragma omp unroll directive was implemented. a222361.

• A status page for tracking C proposals was added. 3a7a774.

RISC-V in China

下周，第一届 RISC-V 中国峰会就开始啦！多个同地活动已经开始宣传和报名。

线下报名已经爆满，这次可以通过线上直播观看。

峰会直播观看地址：

• 半导体行业观察 https://shangzhibo.tv/watch/10449728

• 电子发烧友 http://t.elecfans.com/live/1585.html

• B站直播 https://live.bilibili.com/10339607

• Zoom直播/YouTube直播 待定

RT-Thread 社区

• Linux环境也能用！RT-Thread Studio for VS Code 重磅来袭！

• RT-Thread亮相首届RISC-V中国峰会，精彩活动预告 峰会期间除了相关产品展示，6月23日上午熊大将做RV64上的微内核操作系统rt-smart主题分享，6月24日下午我们开设了基于RISC-V MCU+RT-Thread的应用开发培训，欢迎小伙伴来撩

• 【AI简报20210611期】Arm v9架构来啦、开源实战教你实现文字识别！

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。

PLCT 实验室现在招募 Gem5 模拟器开发实习生，为 RISC-V 的 V 扩展以及其他扩展提供支持。有意者请联系 wuwei2016@iscas.ac.cn

PLCT 实验室长期招募 LLVM、GCC、V8、Chisel 实习生。有意者请联系 wuwei2016@iscas.ac.cn

本周推荐阅读

本周推荐：《没时间休息的休息法》

作者: [日] 荻野淳也

译者: 李耀添

这本书的题目真的是甚合我心，看到了广告立刻就买了。在火车上用 Kindle 翻完的，感觉还不错。可以买来需要的时候翻一翻。

本书没有什么大道理，或者人生哲学，或者比较玄学的理论。刚开始讲了一下正念，然后很快就切入到了各种日常小技巧和小习惯的养成。我觉得非常具有代表性和有用的一个小习惯是「双手喝水」：喝水的时候，不管是有把手的马克杯，还是没有把手的杯子，都用两只手捧起来送到嘴边慢慢的喝。看到这里的时候突然让我有了一种顿悟的感觉，甚至我觉得能够理解作者的思维模式了。

现在，这本书至少从喝水的习惯上改变了我。更加重要的是提供了一种不同的思维模式。