LLVM Weekly - #499, July 24th 2023

LLVM Weekly - #499, July 24th 2023

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Welcome to the four hundred and ninety-ninth 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, @llvmweekly or @asbradbury on Twitter, or @llvmweekly@fosstodon.org or @asb@fosstodon.org.

News and articles from around the web and events

More information about the 2023 US LLVM Developers’ Meeting, including on student travel grants, is now available.

The LLVM Bay Area Monthly meetup will be taking place today, Monday July 24th.

Amir Ayupov blogged on the many faces of LLVM PGO and FDO.

The next LLVM Social Hyderabad will take place online on Saturday 29th July, featuring a talk “ML Driven Hardware Cost Model for MLIR” by Dr. Dibyendu Das

A couple more EuroLLVM recordings have now been posted.

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

  • Office hours with the following hosts: Johannes Doerfert.
  • Online sync-ups on the following topics: Flang, MLIR C/C++ frontend, LLVM pointer authentication, SYCL, OpenMP, classic Flang, loop optimisation working group, OpenMP in Flang, MLIR open meeting, SPIR-V.
  • 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 Neoverse V1. ed08534.

  • MC layer support was added for X86 SHA512, SM3, and SM4 instructions. fc3b787, c6f66de, 049d6a3.

  • Basic folds were added for frexp. 29d2a9b, 296e24c.

  • Documentation was added for memory annotations with llvm-exegesis. 3336836.

  • LLVM’s support library gained the XXH3 variant of the XXHash64 algorithm. 48e93f5.

  • The RISC-V zvfh extension (half float vector) is no longer considered experimental. 3055c58.

  • Codegen and MC layer support was added for the X86 AVX-VNNI-INT16 instructions. 1c154bd.

  • TableGen now supports named arguments and this has been put to use in the RISC-V backend. 91ccbc6, 69fc6bf.

Clang commits

  • Preliminary FatLTO object support was added to Clang. 610fc5c.

  • Performance tips were added to the C++20 modules documentation. 0d6ea6f.

  • Clang now supports bitcode input containing multiple modules. b2f7b5d.

  • C++11-style attributes are now enabled in all language modes. 874217f.

Other project commits

  • LLVM’s libc printf writer was moved to a new design intended to optimise the fast path. b9f6c20.

  • views::repeat and ranges::to was implemented in libcxx. a2160dd, c3648f3.

  • A liveness analysis utility class was added to MLIR. de826ea.