OSDT Weekly 第225期

近期活动

编译社区的八卦信息

• 首届「RISC-V 软件移植及优化锦标赛」筹备工作正式启动，诚邀赞助

GCC

• Stage1快要结束了，有patch需要merge的同学要加速了 GCC 14.0.0 Status Report (2023-10-18), Stage 1 ends Nov. 19th https://gcc.gnu.org/pipermail/gcc-patches/2023-October/633397.html

• [PATCH 0/5] LoongArch: Better balance between relaxation and scheduling https://gcc.gnu.org/pipermail/gcc-patches/2023-October/633583.html

• [PATCH v2 0/2] riscv: Adding support for XTHead(F)MemIdx https://gcc.gnu.org/pipermail/gcc-patches/2023-October/633707.html

• [PATCH] RISC-V: Add popcount fallback expander. https://gcc.gnu.org/pipermail/gcc-patches/2023-October/633406.html

• AI时代，各arch都在on-chip加速上发力。PowerPC的矩阵乘法扩展MMA [PATCH 0/6] PowerPC Future patches https://gcc.gnu.org/pipermail/gcc-patches/2023-October/633510.html

• [PATCH v1] LoongArch: Implement __builtin_thread_pointer for TLS. https://gcc.gnu.org/pipermail/gcc-patches/2023-October/634074.html

• [PATCH 0/6] rtl-ssa: Various fixes needed for the late-combine pass https://gcc.gnu.org/pipermail/gcc-patches/2023-October/634119.html

• [PATCH v2] AArch64: Improve immediate generation https://gcc.gnu.org/pipermail/gcc-patches/2023-October/634152.html

Binutils/GDB

• RFC: Disassembly with call frame information https://sourceware.org/pipermail/binutils/2023-October/130073.html

• [PATCH 0/1] RISC-V: Add support for 'Zacas' atomic CAS https://sourceware.org/pipermail/binutils/2023-October/130095.html

• [PATCH 0/5] ARM function-calling / return fixes https://sourceware.org/pipermail/gdb-patches/2023-October/203454.html

GLIBC

• Arm的ISA演进还是很稳健的。v8.x/v9.x有不少性能和安全相关的扩展。 MOPS很好的解决了memcpy优化的痛点，终于可以忘记各种寄存器带宽和预取策略 [PATCH v2] AArch64: Add support for MOPS memcpy/memmove/memset https://sourceware.org/pipermail/libc-alpha/2023-October/152254.html

LLVM/Clang/LLDB/LLD

本节内容来自 LLVM Weekly 第 512 期， Alex Bradbury 大哥持续稳定输出。

• 很有用： Nikita Popov has written up a fantastic guide on how to 'reduce' LLVM crashes to minimal test cases.

• 新特性？ JeanHeyd Meneide blogged about implementing #embed support for C and C++, covering proposed implementations in both GCC and Clang.

• 可能有用： Daniel Kleinstein wrote up a guide on tracing memory access with an LLVM pass.

• 按照git要求是必须显示的，不然无法追踪： Mehdi Amini started a discussion on if the LLVM project should do something about 'hidden' emails on GitHub.

• 有兴趣可以看一看： Further notes were shared from the LLVM dev meeting: presubmit testing roundtable, AArch64 round table, embedded toolchains workshop, and the embedded toolchain roundtable. Thanks to those who took notes!

• 好耶！ David Spicket has proposed adding TableGen to the much-loved Compiler Explorer and is asking for any comments from the LLVM community.

• 新的会议： There are new regular meetings set up for LLVM libc, GlobalISel, and AArch64. There was also a reminder about the Clang Language Working Group meetings.

• 代码评审需要阅读： The LLVM Code of Conduct Committee shared a warning on submitting code or review comments on someone else's behalf.

QEMU (RISC-V)

• [PATCH 0/4] target/riscv: rename ext_i* to ext_zi*, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00267.html

• [PATCH v2 00/16] target: Make 'cpu-qom.h' really target agnostic, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00291.html

• [PATCH v5 0/6] target/riscv: Add RISC-V Virtual IRQs and IRQ filtering support, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00355.html

• [PATCH v4 0/6] Support discontinuous PMU counters, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00399.html

• [PATCH v3 0/6] riscv: query-cpu-model-expansion API, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00406.html

• [PATCH v2] target/riscv: pmp: Clear pmp/smepmp bits on reset, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00415.html

• [PATCH v3] target/riscv: pmp: Ignore writes when RW=01, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00416.html

• [PATCH v3 00/12] RISC-V: ACPI: Enable AIA, PLIC and update RHCT, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00428.html

• [PATCH 00/19] cpus: Step toward removing global 'first_cpu', https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00457.html

• [PATCH v3 0/6] riscv: RVA22U64 profile support, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00484.html

• [PATCH v3 0/4] riscv: zicntr/zihpm flags and disable support, https://lists.gnu.org/archive/html/qemu-riscv/2023-10/msg00569.html

RISC-V in China

• 首届「RISC-V 软件移植及优化锦标赛」筹备工作正式启动，诚邀赞助

RT-Thread 社区

• 风平浪静。招募志愿者小编。

TVM / AI Compilers

• 风平浪静。招募志愿者小编。

本周工具链岗位

往期社招及实习生招聘长期有效。

• PLCT Lab 新开放100名开源实习岗位，面向 RISC-V 移植操作系统、数据库、网络基础库
• PLCT 实习： BJ100 RISC-V nettle 开发实习生
• PLCT 实习： BJ99 RISC-V OpenSSL 开发实习生
• PLCT 实习： BJ98 Flutter RISC-V 开发实习生
• 开源实习：算能科技招募AI开源工具链开发（TPU-MLIR项目）
• 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

本周推荐阅读

本周推荐：《芯片战争》

作者： [美]克里斯·米勒

译者： 蔡树军

推荐： 小编1号

确实写的挺好的。涉及到的技术细节并不多，主要立足将半个世纪里的关键的人物和公司之间的关系展示出来。

其中尤其是日本和美国的半导体科技商战中美国政府的耍流氓途径，放在今天看对中国大陆的各种封锁，有着高度的相似性。不同的是美国在日本有驻军，基本上是强行压制下来了；相信在2019-2029会有可能不一样的精彩。