OSDT Weekly 第203期

近期活动

• 6月24日南京meetup开始筹备。

编译社区的八卦信息

• C++ 中文周刊 第 114 期

GCC

• 这周的RISC-V后端开发，Juzhe是主角，发出一系列自动向量化的改进

• [PATCH V2] RISC-V: Refactor the framework of RVV auto-vectorization https://gcc.gnu.org/pipermail/gcc-patches/2023-May/619291.html

• [PATCH] RISC-V: Fix magic number of RVV auto-vectorization expander https://gcc.gnu.org/pipermail/gcc-patches/2023-May/619343.html

• [PATCH V5] RISC-V: Add RVV comparison autovectorization https://gcc.gnu.org/pipermail/gcc-patches/2023-May/619366.html

• [V2 COMMITTED] RISC-V: Add RVV mask logic auto-vectorization https://gcc.gnu.org/pipermail/gcc-patches/2023-May/619397.html

• [PATCH] RISC-V: Implement autovec abs, vneg, vnot. https://gcc.gnu.org/pipermail/gcc-patches/2023-May/618992.html

• [RFC V2] RISC-V : Support rv64 ilp32 https://gcc.gnu.org/pipermail/gcc-patches/2023-May/618959.html

• [PATCH] RISC-V: Add mode switching target hook to insert rounding mode config for fixed-point instructions https://gcc.gnu.org/pipermail/gcc-patches/2023-May/618827.html

• 其他RISC-V的改进。目前GCC的后端x64和arm64趋于稳定，也就RISC-V热火朝天，软件生态追齐指日可待。

• [PATCH] RISC-V: improve codegen for large constants with same 32-bit lo and hi parts [2] https://gcc.gnu.org/pipermail/gcc-patches/2023-May/618948.html

• RISC-V Test Errors and Failures https://gcc.gnu.org/pipermail/gcc-patches/2023-May/618758.html

• [pushed] wwwdocs: readings: Adjust link to Arm architectures https://gcc.gnu.org/pipermail/gcc-patches/2023-May/619087.html

Binutils/GDB

• LoongArch实现了简单的链接时优化，在二进制level进行简单的peephole，binutils把这个叫relaxation。 [PATCH v4 0/6] LoongArch linker relaxation support. https://sourceware.org/pipermail/binutils/2023-May/127539.html

• [RFC PATCH V2 0/4] RISC-V : Support ilp32 abi on rv64 isa https://sourceware.org/pipermail/binutils/2023-May/127501.html

• [PATCH] Support Intel FRED LKGS https://sourceware.org/pipermail/binutils/2023-May/127485.html

• [PATCH v2 00/17] SME support for AArch64 gdb/gdbserver on Linux https://sourceware.org/pipermail/gdb-patches/2023-May/199716.html

GLIBC

• 允许把动态库map到指定的地址空间 [PATCH 00/14] implement RTLD_NORELOCATE api [BZ #30007]

• Add HWCAP2_SME* from Linux 6.3 to AArch64 bits/hwcap.h https://sourceware.org/pipermail/libc-alpha/2023-May/148231.html

• [PATCH 00/10] Stack setup & misc fixes for x86_64-gnu https://sourceware.org/pipermail/libc-alpha/2023-May/148204.html https://sourceware.org/pipermail/libc-alpha/2023-May/148241.html

LLVM/Clang/LLDB/LLD

以下值得关注的内容来自小编9号的整理和推荐：

1. https://discourse.llvm.org/t/type-based-escape-analysis/70803 社区开发者正在调研在LLVM中支持 Type based escape analysis
2. https://reviews.llvm.org/D146872 合并了，现在rvv intrinsic 中的 tuple 类型可以在llvm ir 中用struct type表示出来，这可以更好地配合SROA/Mem2Reg pass来消除大量的alloca, load, store

本节内容来自 LLVM Weekly 第 427 期， Alex Bradbury 大哥持续稳定输出。

• 很有意思的圆桌： There were a number of really helpful summaries from EuroLLVM round tables posted - thanks to everyone involved in taking notes and sharing these. See Kristof Beyls' office hours summary, J Ryan Stinnett's debug info summary, Peter Smith's LLVM embedded toolchain's summary and Andrzej Warzynski's targeting CPUs from ML frameworks summary.

• 做Infra的同学关注： Following EuroLLVM, there was a lot of additional discussion about pre-commit testing using buildbot.

• 注意： The long defunct LLVM Python bindings were removed from the tree. 2980029.

• 好耶！ JITLink gained support for RISC-V linker relaxation. 310473c.

• asb的工作： MC layer support for the experimental zfbfmin, zvfbfmin, and zvfbfwma extensions (BFloat16 related) was added to the RISC-V backend. 35ff5eb, b18a819, a1455de.

QEMU (RISC-V)

• [PATCH v9 00/11] target/riscv: rework CPU extension validation, https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00346.html

• [PATCH 0/6] Add RISC-V Virtual IRQs and IRQ filtering support, https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00372.html

• [PATCH v5 0/3] Smstateen FCSR, https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00384.html

• [PATCH v5] hw/riscv: qemu crash when NUMA nodes exceed available CPUs, https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00398.html

• [PATCH 0/5] hw/riscv/opentitan: Correct QOM type/size of OpenTitanState, https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00408.html

• [PATCH v3 0/4] target/riscv: Add Smrnmi support., https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00417.html

• [PATCH v4 0/3] Implement the watchdog timer of HiFive 1 rev b., https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00437.html

• [PATCH v2 0/8] Add support for extension specific disas, https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00441.html

• [PATCH 0/2] Refresh the dynamic CSR xml after updating the state of the cpu., https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00454.html

• [PATCH v2 0/7] target/riscv: Add support for PC-relative translation, https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00459.html

• [PATCH v7 0/2] target/riscv: Fix pointer mask related support, https://lists.gnu.org/archive/html/qemu-riscv/2023-05/msg00476.html

RISC-V in China

• 风平浪静。

RT-Thread 社区

• 风平浪静。

TVM / 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实验室招募 DynamoRIO RISC-V 移植开发实习生(LV3+)
• 开源实习：算能科技招募AI开源工具链开发（TPU-MLIR项目）
• 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

本周推荐阅读

本周推荐：《鱼翅与花椒》

作者： 扶霞·邓洛普

译者： 何雨珈

推荐： 小编1号

这是一本阅读的时候需要带着纸巾的书。每当我看到书中如何描写那花椒的麻和成都担担面的辣爽的时候，总是觉得全身的感受器官都被调动起来了。这位来自英国的作者在90年初就跑到了四川成都到处吃，并且——甚至——骑着自行车穿过半个城市去偶然碰到的四川厨艺学校学习了烹饪。不得不说，那真是一个奔放的年代，所有人都在进行大胆的尝试，和探索。

在断断续续阅读到后面，我逐渐开始羡慕书中描绘的一切。