LLVM Weekly - #534, March 25th 2024

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LLVM Weekly - #534, March 25th 2024

If you prefer, you can read the canonical version of this issue at http://llvmweekly.org/issue/534.

Welcome to the five hundred and thirty-fourth 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

LLVM 18.1.2 was released.

The /r/cpp subreddit C++ committee trip report for the March meeting in Tokyo is now up.

According to the LLVM calendar in the coming week there will be the following (note: US is still ahead of most countries in entering daylight savings time so meeting times may be different to usual):

  • Office hours with the following hosts: Kristof Beyls, Johannes Doerfert, Amara Emerson.
  • Online sync-ups on the following topics: SPIR-V, new contributors, OpenMP, Flang, MLIR, RISC-V, embedded toolchains.
  • For more details see the LLVM calendar, getting involved documentation on online sync ups and office hours.

On the forums

LLVM commits

  • A detailed InstCombine contributor guide is now available. 6898147.

  • Temporary DbgRecord functions were added to the DIBuilder C API to help downstream projects during the transition period. f0dbcfe.

  • 3-way comparison intrinsics were introduced. 276847a.

  • As a stepping stone towards the migration to ptradd, the representation of getelementptr inrange was changed. 0f46e31.

  • A PreferSmallerInstructions option was added to control the AsmMatcherEmitter and used for Arm as part of a refactoring. 6854f6f, 295cdd5.

  • A scheduling model was added for the SiFive-P670. c48d818.

  • Minbitwidth analysis in the superword level parallelism vectoriser was improved. 31eaf86.

  • DPValue was renamed to DbgVariableRecord, DPLabel renamed to DbgLabelRecord, and DPMarker to DbgMarker. ffd08c7, bdc77d1, 75dfa58.

  • The Hexagon backend gained support for emitting Hexagon elf attributes. 31f4b32.

  • REG_SEQUENCE and EXTRACT_SUBREG are now used to move between individual GPRs and GPRPair, leading to much better codegen for Zdinx (double-precision floating point in GPRs) on RV32. 576d81b.

  • llvm-objdump gained --skip-symbol[s] options. 4946cc3.

Clang commits

  • The default linker for wasm32-wasip2 is now wasm-component-ld. d66121d.

  • clang-cl now supports runtime feature detection of intrinsics. afec08e.

  • A soft-float ABI was added for AArch64. ef395a4.

  • Lambda expressions are now accepted in C++03 mode as an extension. 2699072.

  • RISC-V profile names can now be giving for -march. b44771f.

  • bugprone-suspicious-stringview-data-usage was added to clang-tidy. 28c1279.

Other project commits

  • BOLT gained support for the Linux kernel static keys jump table. 6b1cf00.

  • LLVM’s libc gained implementations of strfromd and strfroml. 83e9697.

  • ObjectiveC category merging was added to the lld-macho linker. cd34860.

  • Python bindings were enabled for the MLIR index dialect. eb861ac.