LLVM Weekly - #645, May 11th 2026

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LLVM Weekly - #645, May 11th 2026

If you prefer, you can read the canonical version of this issue at https://llvmweekly.org/issue/645.

Welcome to the six hundred and forty-fifth 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

I’ve written up the recipes I use to build 32-bit RISC-V sysroots with Yocto for LLVM cross compilation and testing.

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

  • Office hours with the following hosts: Aaron Ballman, Alexey Bader, Alina Sbirlea, Kristof Beyls, Johannes Doerfert.
  • Online sync-ups on the following topics: Flang, alias analysis, qualification, modules, libc++, lifetime safety, LLVM/Offload, OpenMP for flang, HLSL, memory safety, reflection.
  • For more details see the LLVM calendar, getting involved documentation on online sync ups and office hours.

On the forums

LLVM commits

  • A scheduling model was added for the Arm “C1-Premium”. a3c18c0.

  • The require-logical-module flag can be used to require the use of logical alloc/gep instructions. 9fe04e0.

  • The elementwise modifier can now be used with atomicrmw. 239ca8d.

  • The LangRef now documents the expected layout for patchable-function-entry and patchable-function-prefix attributes. 6e27684.

  • MC layer support was added for the experimental RISC-V Zvvmm integrated matrix extension. a8b0124.

  • The LoopFusion pass was documented. cb15e67.

  • The initial infrastructure for the Instrumentor pass was committed. 7b4175c, c507e20.

  • Developer guidelines were added for the AMDGPU backend. f996fa2.

  • MC layer support was added for WebAssembly’s typed select instruction. 82b2aeb.

  • The 2026 Security Response Group Transparency report is now available. 143aa41.

Clang commits

  • The clang-ssaf-analyzer tool was introduced, which can run whole program analysis over an ‘LUSummary’. 51d2a66.

  • Infrastructure was added for NVPTX builtins in ClangIR. 8a4f8ba.

  • As part of Thread Safety Analysis, attributes can now be put on function pointers. d1e84bb.

  • Through -fexperimental-abi-lowering, the LLVMABI function call ABI lowering can be used. 07b5dfe.

Other project commits

  • BOLT’s gadget scanner documentation was updated. 25deb6e.

  • A basic dl_iterate_phdr implementation was added to LLVM libc. a1d21cc.

  • PIC/dynamic linking is no longer marked as experimental in the Wasm linker. d063eeb.

  • Instructions were added for debugging the LLDB VSCode extension. 31d1ce8.

  • A more complex mlir-reduce example was added to the documentation. 6a9c3b6.