LLVM Weekly - #641, April 13th 2026

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LLVM Weekly - #641, April 13th 2026

If you prefer, you can read the canonical version of this issue at https://llvmweekly.org/issue/641.

Welcome to the six hundred and forty-first 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.

I’m in Dublin for EuroLLVM this week - hopefully I’ll see a bunch of you here!

News and articles from around the web and events

Kavin Gnanapandithan blogged about tracking down and fixing a performance regression in LLVM RISC-V code generation. It walks through the whole process of spotting a regression on Igalia’s LNT instance, analysing the problem, and finding and patching the issue.

Fangrui Song wrote about recent performance improvements to the LLD ELF linker. Comparing current main against LLVM 22.1 “Release+Asserts clang --gc-sections link is 1.37x as fast as lld 22.1; Chromium debug with --gdb-index is 1.07x as fast.” Read the post for more details, as well as why mold and wild are faster still.

According to the LLVM Calendar in the coming week there will be the following (note, it’s possible some may be impacted by EuroLLVM):

  • Office hours with the following hosts: Aaron Ballman, Alexey Bader, Alina Sbirlea, Phoebe Wang, Johannes Doerfert.
  • Online sync-ups on the following topics: Flang, MLIR C/C++ frontend, LLVM qualification, modules, libc++, lifetime safety, LLVM/Offload, Clang C and C++ language working group, OpenMP for flang, HLSL, reflection.
  • For more details see the LLVM calendar, getting involved documentation on online sync ups and office hours.

On the forums

LLVM commits

  • inline_history metadata was introduced, which can be attached to a call instruction and will indicate if the call instruction itself has been inlined from the referenced functions. be62f27.

  • An llvm-testing-tools Python package was added to enable packaging split-file and FileCheck for distribution on PyPI. a974f0a.

  • A Hexagon ELF backend was added to JITLink. 0d64040.

  • The work to remove trivial VP intrinsics from the RISC-V backend continues. 7c1805d, f1aa984.

  • llvm.masked.{udiv,sdiv,urem,srem} intrinsics were added. 9ba7745.

  • Common library functions like malloc, calloc, printf were implemented in the UB-aware IR interpreter. f149ab6.

  • LLVM’s CMake build system now supports statically linking libxml2. 11a8026.

Clang commits

  • -Wnon-portable-include-path-separator was added to warn on #include path with backslashes. 9a1860c.

  • Inline HLSL intrinsics were moved to TableGen. 88af280.

  • A patch landed that undoes some of the performance regression for concepts between clang-21 and clang-22. c73872a.

Other project commits

  • LLVM libc’s rpc_server.h no longer builds on internal libc printing utilities. 64ac9da.

  • flang’s driver gained support for -fprofile-sample-use. d6d7d0a.

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Looks like this is pointing to the wrong commit?

Minor typo