LLVM Weekly - #558, September 9th 2024

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LLVM Weekly - #558, September 9th 2024

If you prefer, you can read the canonical version of this issue at http://llvmweekly.org/issue/558.

Welcome to the five hundred and fifty-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

The 2024 LLVM Developers’ Meeting program has been released.

LLVM 19.1.0-rc4 was released, and 19.1.0-final is planned for 17th September.

A number of blog posts about LLVM GSoC projects are now available: GPU libc benchmarking, half-precision in LLVM libc, and compiling GPU kernels using ClangIR.

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

  • Office hours with the following hosts: Alexey Bader, Aaron Ballman, Alina Sbirlea, Kristof Beyls, Johannes Doerfert,
  • Online sync-ups on the following topics: MLIR C/C++ frontend, alias analysis, pointer authentication, SPIR-V, new contributors, OpenMP, Flang, BOLT, RISC-V, MLIR, embedded toolchains, MLGO.
  • For more details see the LLVM calendar, getting involved documentation on online sync ups and office hours.

On the forums

LLVM commits

  • BasicAA learned to track the nuw flag through decomposed expressions. b9bba6c.

  • spirv-sim, a minimal SPIR-V simulator in Python was added for testing purposes. 5914566.

  • Support was added for AVX10.2-BF16 X86 instructions. 83ad644.

  • The initialisation performance of APInt was improved. 427e202.

  • -verify-each was added to llc. 69657eb.

  • With the -emit-jump-table-sizes-section option, LLVM will emit a .llvm_jump_table_sizes section in the output binary containing jump table addresses and entry counts. This may be used by tools that statically reconstruct the control flow of executables. fb6c10d.

  • usub_{cond,sat} operations were added to atomicrmw. 4af249f.

Clang commits

  • multilib.yaml now allows you to map a particular multilib to an informative error message. 26bf0b4.

  • BPF now defaults to the “v3” CPU target. 7852ebc.

Other project commits

  • LLVM’s libc bcmp was optimised. 66a03295.

  • An --icf=safe_thunks mode was added for identical code folding in LLD MachO for Arm64. d175616.

  • LLDB learned to handle optionally enabled/disabled floating point registers for riscv64. 660e34f.

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