LLVM Weekly - #446, July 18th 2022

LLVM Weekly - #446, July 18th 2022

If you prefer, you can read a HTML version of this email at http://llvmweekly.org/issue/446.

Welcome to the four hundred and forty-sixth 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, or @llvmweekly or @asbradbury on Twitter.

News and articles from around the web

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Another talk from EuroLLVM is now available (I believe the final one). Jan Svoboda presents “Implicitly discovered, explicitly built Clang modules”.

On the forums

LLVM commits

  • Initial support was added for converting function returns with jumps to an architecture-specific symbol on X86 (e.g. __x86_return_thunk). This can be used to mitigate RetBleed. 2240d72.

  • Initial support for COFF was added to JITLink. db995d7.

  • LoongArch codegen functionality was further expanded, with support for FP conversions and atomics. 1df96ce, e147a0f, 47f3dc6.

  • Support for float binop constant expressions was removed. 4bb7b6f.

  • Instruction predicate verification was moved so it triggers for both assembly and object emission (rather than just object emission). 3e0bf1c.

  • A RISC-V specific CodeGenPrepare pass was added, looking for opportunities for replacing zero-extension with sign-extension on RV64. 1a8468b.

Clang commits

  • Documentation is now available for the git-clang-format. 422e6e7.

  • Support was added for -mstack-protector-guard-symbol on X86. a45dd3d.

  • A MacroUnexpander was added to clang-format. d6d0dc1.

  • Clang’s dataflow analysis gained more readable pretty-printing. c9666d2, b8d83e80.

Other project commits

  • A GDB plugin was written that uses libompd to provide debugging support for OpenMP programs. 51d3f42.

  • MLIR’s C/Python registration APIs were overhauled. 5e83a5b.

  • The Flang intrinsic types were documented. 9d24eba.

  • pthread_equal and pthread_self were implemented in LLVM’s libc. 8dc4280.

  • std::ranges::{set_union,find_end,search,set_symmetric_difference} were implemented. 101d1e9, a5c0638, 3151b95.

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The second and third clang commit and the same commit hash listed. I think that the MacroUnexpander commit is supposed to be d6d0dc1.

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Thank you - now fixed here and in the version at llvmweekly.org

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