LLVM Weekly - #477, February 20th 2023

LLVM Weekly - #477, February 20th 2023

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Welcome to the four hundred and seventy-seventh issue of LLVM Weekly, a weekly newsletter (published every Monday) covering developments in LLVM, Clang, and related projects. LLVM Weekly is brought to you by Alex Bradbury. Subscribe to future issues at http://llvmweekly.org and pass it on to anyone else you think may be interested. Please send any tips or feedback to asb@asbradbury.org, or @llvmweekly or @asbradbury on Twitter.

News and articles from around the web and events

Registration for the 2023 EuroLLVM Developers’ Meeting is now open.

An in-personal LLVM meetup will be held on Feb 25th in Wuhan, China. A meetup will also be taking place in Bangalore on the same day.

Jonas Hahnfeld writes about making enough of Cling and ROOT work on RISC-V to re-discover the Higgs boson.

The /r/cpp Reddit moderators have posted a trip report from the 2023-02 Issaquah ISO C++ committee meeting (highlight: C++23 is done!).

According to the LLVM calendar in the coming week there will be:

  • Office hours with the following hosts: Kristof Beyls, Johannes Doerfert.
  • Online sync-ups on the following topics: Flang, LLVM security group, OpenMP, loop optimisation, OpenMP in Flang, MLIR, and SPIR-V.
  • For more details see the LLVM calendar, getting involved documentation on online sync ups and office hours.

On the forums

LLVM commits

  • The CallBrPrepare pass was introduced. fb47115, 0a39af0, 094190c, 28d45c8, 5cc1016, a3a84c9.

  • A build for Windows on Arm was added to the LLVM release packaging script. c5e1000.

  • New pass manager support was added to the HardwareLoops pass. 2a58be4.

  • MC layer support was added for the RISC-V vendor-specific XTHeadBs and XTHeadBb, and XTHeaadMAC extensions. Initial support was also added for Zfa. 04a2baf, fc02eeb, d4012bc, c0947dc, df56b55.

  • PPC’s GISel gained support for fpconstant. 6ee2f77.

  • The hasBitPreservingFPLogic hook was removed. 09dd4d8.

  • Additional parts of the llvm-debuginfo-analyzer implementation were committed. 7fbcc24.

  • Zicsr and Zifencei extensions are now accepted as command-line options in the RISC-V backend, increasing compatibility with GCC. 22e199e.

  • The PlaceSafepoints pass was ported to the new pass manager. 1ceb79e.

Clang commits

  • Documentation was added for clang-scan-deps -format=p1689. 9c4f0d8.

  • The deprecated -fmodules-ts flag was removed. 612f3ac.

  • Clang now supports WebAssembly externrefs. 890146b.

Other project commits

  • LLVM’s libc gained a loader utility for AMDHSA architectures for testing. 67d78e3.

  • Thread-safety annotations were added to the Scudo allocator. 6a4c395.

  • An RFC on -fstack-arrays was committed to the Flang documentation. 5922b88.

  • HLFIR array constructor lowering started to land in Flang. ffde9f1, a9e4bb3.

  • LLDB now has architecture-specific watchpoint behaviour defaults. eaeb8dd.

  • LLDB support for Renderscript was removed, as it is deprecated in Android. 17e2497.