LLVM Weekly - #471, January 9th 2023

LLVM Weekly - #471, January 9th 2023

If you prefer, you can read a HTML version of this email at http://llvmweekly.org/issue/471.

Welcome to the four hundred and seventy-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 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

llvm.org has been updated with the planned schedule for LLVM 16.0.x. The 16.x branch is scheduled to be created on Jan 24th.

The LLVM blog features a post summarising the outcomes of six internships related to interactive (e.g. JITted) C++ development.

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

  • Office hours with the following hosts: Aaron Ballman, Alexey Bader, Alina Sbirlea, Kristof Beyls, BOLT developers, Anastasia Stulova, and Johannes Doerfert.
  • Online sync-ups on the following topics: Flang, SYCL, OpenMP, loop optimisations, MLIR, 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 ConstraintElim pass was enabled by default. fb13dcf.

  • Variadic DBG_INSTR_REFs are now supported in LiveDebugValues. a344c90.

  • The type promotion pass gained support for the new pass manager. 615333b.

  • llvm.vp.{ctlz,cttz,abs} were added and implemented for RISC-V. 1e9e1b9, 5a57ebc.

  • LLVM was updated to use ArrayRef deduction guides rather than llvm::makeArrayRef. 38818b6.

  • Runtime unrolling was disabled for vectorised loops. 68469a8.

  • Additional codegen patterns were added for the RISC-V XVentanaCondOps extensions. 1aa9862.

Clang commits

  • clang no longer emits the "frame-pointer"="none" attribute, as it is the default behaviour. ce6ae0b.

  • AArch64 SVE intrinsics are now gated on the target not by ifdef preprocessor macros. 6cac7c2, 9978529.

  • clang-format gained an option to break after C++11 attributes. a28f074.

  • The -fexcess-precision option was added. 85d049a.

Other project commits

  • In MLIR, the import of LLVM IR intrinsics and metadata was made extensible. 0cf06639, cf487cc.

  • TBAA metadata is now supported in the MLIR LLVMIR dialect. 2f66c89.

  • DFSan now supports AArch64 Linux. de5416c.

  • A recipe was documented for doing a full standalone cross-build of libc. 36de85f.