LLVM Weekly - #528, February 12th 2024

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LLVM Weekly - #528, February 12th 2024

If you prefer, you can read the canonical version of this issue at http://llvmweekly.org/issue/528.

Welcome to the five hundred and twenty-eighth 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

“xoranth” blogged about switch lowering in GCC.

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, Johannes Doerfert.
  • Online sync-ups on the following topics: alias analysis, poitner authentication, new contributors, OpenMP, Flang, BOLT, RISC-V, libc, 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

  • A new JumpTableToSwitch pass was introduced, replacing an indirect call with a switch and direct calls if all functions in the jump table are smaller than the specified threshold. d26b43f.

  • A preserve_none calling convention was introduced and is supported on X86-64 only for now. c166a43.

  • LLVM’s documentation was improved to be clearer about when the new vs the legacy pass manager is used. 1b5fae9.

  • Many in-tree tests were converted to opaque pointers. 1ee315a, 00a4e24, 6e83c0a, and more.

  • MC layer support was added for the RISC-V pointer masking extension. 0bf165e.

  • The newly added ‘skip-precommit-approval’ label for use with PRs that are not meant to be reviewed (e.g. reverts) was documented. 9347146.

  • The unmaintained LoopReroll pass was removed. ac3bd2b.

  • Arbitrary general purpose registers can now be reserved for Sparc. c2f9885.

Clang commits

  • C intrinsics were added for the RISC-V Zvfbfwma extension. ae5ed2a.

  • The clang linker wrapper now supports relocatable linking for offloading. 5c84054.

  • -Wshorten-64-to-32 is now grouped under -Wimplicit-int-conversion. 4b72c5e.

Other project commits

  • MLIR’s transform dialect tutorials were updated. b33b91a.

  • The float128 rounding functions were added to LLVM’s libc. 6ba9d29.

  • LLD can now relax the R_LARCH_ALIGN relocation for LoongArch. 06a728f.

  • Initial mapping of Fortran pointers and allocatable variables for target devices was implemented in MLIR. 95fe47c.

  • SiFive VCIX intrinsics are now supported in MLIR’s LLVMIR dialect. 9f6c005.

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