LLVM Weekly - #426, February 28th 2022
If you prefer, you can read a HTML version of this email at http://llvmweekly.org/issue/426.
Welcome to the four hundred and twenty-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
Fangrui Song blogged about lld/ELF changes in LLVM 14.
The video from the January Women in Compilers and Tools January Meetup has now been posted. It features a discussion with Anna Ossowski, organised in collaboration with PyLadies London.
A recent post on the Linaro blog explains how to set up Windows on Arm for LLVM development.
George A Constantinides wrote about recent high-level synthesis work using LLVM that will be presented at the ACM FPGA conference.
The Rust Compiler Team have shared their ambitions for 2022.
On the forums
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Please participate in this poll if you’re thinking about attending EuroLLVM 2022 in London UK.
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As a reminder, feedback on the move to Discourse is requested to be submitted by March 7th.
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Aaron Ballman shared an RFC on enabling -Wstrict-prototypes by default in C, proposing to additionally make it default to an error. Some respondents were concerned about the impact on legacy codebases (e.g. benchmarks).
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Fangrui Song initiated a discussion about parallel/thread-safe algorithms, allocators, and containers in the LLVM project.
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There’s been much more discussion about adding a C++ pseudo parser to clang for use in tooling, with a detailed discussions about some of the pros/cons of adding an additional parser.
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LLVM GPU News #29 is out.
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River Riddle posted an RFC aiming to address scalability/sustainability issues in MLIR dialect extensibility.
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Discussion on adding an LLVM content-addressable storage library has continued, and as a next step a meeting has been organised for Tuesday 1st March.
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Anton Korobeynikov sent a heads-up that label-based notifications are now enabled for the LLVM repo. This is an early access GitHub feature.
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Rachit Nigam advertised that the 2nd Workshop on Languages, Tools, and Techniques for Accelerator Design (LATTE’22) will take place on March 1st 2022, noting it has a strong overlap with CIRCT.
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“Luna” asked for advice on debugging a Clang compile command that never completes and received several suggestions.
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Stephen Tozer wrote an RFC on removing the build and test discovery mechanisms from Dexter.
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“lxsameer” is seeking feedback on adding clang-doc support for export to org-mode and lisp lists.
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Slides from a recent Flang developers call are now available.
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The inaugural meeting for the Clang C/C++ language working group has been set for Wed March 2nd at 11am ET.
LLVM commits
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LLVM ‘office hours’ were documented. 7a837d3.
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Demanded bits are now used to convert a multiply to a shift where possible. 21d7c3b.
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Builtins/intrinsics were added for more FMA variants in the NVPTX backend. be67293.
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llc for RISC-V will now use the same logic as Clang to select the ABI based on the target architecture. 4e115b7.
Clang commits
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clang-format gained a new InsertBraces option, that will insert optional braces after if/elf/for/while/do. 77e60bc.
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As part of the ‘pseudo parser’ work, an LR parsing table was implemented. a2fab82.
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Support was added for
-ffp-eval-methodand#pragma clang fp eval_method. 1592d88. -
As part of the work to add a dataflow analysis framework to Clang, a SAT solver interface and implementation were added. 53dcd9e.