LLVM Weekly - #491, May 29th 2023

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LLVM Weekly - #491, May 29th 2023

If you prefer, you can read a HTML version of this email at http://llvmweekly.org/issue/491.

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

News and articles from around the web and events

Save the date for the 2023 US LLVM Developers Meeting! It will take place on October 10-12 in Santa Clara, CA.

Min-Yih “Min” Hsu blogged about what’s new in M68k LLVM.

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, OpenMP, classic Flang, loop optimisations, OpenMP in flang, HLSL, SPIR-V, MLGO.
  • For more details see the LLVM calendar, getting involved documentation on online sync ups and office hours.

On the forums

LLVM commits

  • A skeleton PPC64 JITLink backend was added, which also aims to serve as a good example of how to introduce a JITLink backend for a new architecture. 8313507.

  • The X86FixupVectorConstantsPass was introduced, which will re-fold AVX512 vector load folds as broadcast folds. 0b91de5.

  • Small (less than 32/64-bit width) vector copies and vector stores are now scalarized on RISC-V. 28b21c4, a8a36ee.

  • PostShrinkWrap was enabled by default. c4a60c9.

  • A GCNRewritePartialRegUses pass was added to AMDGPU to rewrite partially used virtual super-registers with registers of minimal size. 8d0412c.

  • The .option arch directive is now supported in RISC-V assembly. 9e8ed34.

  • The load-store-vectorizer was rewritten using a new algorithm, aiming to prefer scalar loads if faster. 2be0abb7.

Clang commits

  • __bf16 was made an arithmetic (rather than storage-only) type. e621757.

  • RISC-V vector tuple types are now implemented. 5e92298, 0019226, and more.

  • Python files in clang and clang-tools-extra were reformatted with black. dd3c26a.

  • Initial interactive CUDA support for clang-repl was committed. ddeab07.

Other project commits

  • libc++ <format> is now considered stable. dff62f5.

  • Python files in the non-LLVM and Clang directories were reformatted with black. f98ee40, 2238dcc, f9008e6.

  • PowerPC vector types are now supported in Flang. ef93417.

  • The LLVM libc math function status page was updated to show more targets (including linux-riscv64). 0bda541.

  • lld gained a new --print-memory-usage option to print details of the target’s memory usage. 811cbfc.

  • A generic scalar replacement of aggregates pass was added to MLIR. 4ed502e.

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