LLVM Weekly - #604, July 28th 2025

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LLVM Weekly - #604, July 28th 2025

If you prefer, you can read the canonical version of this issue at https://llvmweekly.org/issue/604.

Welcome to the six hundred and fourth 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 https://llvmweekly.org and pass it on to anyone else you think may be interested. Please send any tips or feedback via email: asb@asbradbury.org, or Mastodon: @llvmweekly@fosstodon.org / @asb@fosstodon.org, or Bluesky: @llvmweekly.org / @asbradbury.org.

News and articles from around the web and events

The LLVM hearts ML Workshop has been announced, taking place teh day before the LLVM Dev Meeting.

As a reminder, the call for papers for the LLVM-HPC Workshop at SC’25 closes on August 15.

The Klipspringer blog features a post presenting an LLVM garbage collection statepoints demo.

Fangrui Song gave a detailed write-up of recent changes to section fragment handling in LLVM.

According to the LLVM Calendar in the coming week there will be the following:

  • Office hours with the following hosts: Johannes Doerfert, Renato golin.
  • Online sync-ups on the following topics: ClangIR upstreaming, pointer authentication, OpenMP, Flang, LLVM qualification working group, RISC-V, libc, HLSL, MLGO.
  • For more details see the LLVM calendar, getting involved documentation on online sync ups and office hours.

On the forums

LLVM commits

  • The newly added LDBG macro provides a handy shortcut for debug logging. d368d11.

  • An initial SFrame parser and dumper was added as well as GNU compatible syntax parsing and an llvm-mc command line flag. aa7ada1, 29e8599.

  • llvm-objdump gained support for --debug-inlined-funs which will print the location of inlined functions alongside disassembly. e94bc16.

  • Guidance was added on specifying GitHub workflows in a way that doesn’t interact negatively with stacked PRs. 09580f7.

  • DataWithEVL is now used as the preferred tail folding style for RISC-V. This is in preparation to make EVL tail folding by default. 20c52e4.

  • The LangRef now documents the case of allocated objects that can grow (e.g. using mmap to reserve a wide range of pages). b1aece9.

  • Vector instruction latencies for the RISC-V SpacemiT-X60 started to be added. 8952225.

Clang commits

  • The experimental lifetime safety analysis can now be enabled/disabled for -f[no]-experimental-lifetime-safety. 0d04789.

  • Reduced BMI (Binary Module Interface) mode for C++20 modules is now the default option. 255a163.

  • Code related to trigraph support in clang-format was removed. 12a3afe.

  • ClangIR support for array constructors was added. 3e9d369.

  • __builtin_wasm_test_function_pointer_signature was added. 15b0368.

Other project commits

  • The lldb-rpc-gen tool was committed. 68c8c8ce.

  • !$omp unroll support was implemented in Flang. b487f9a.

  • LLVM’s libc now has generic comparison operations for floating point types implemented in its FPUtil library. e789f8b.

  • LLD can now read AArch64 build attributes and convert them into GNU properties. d52675e.

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