LLVM Weekly - #310, December 9th 2019
Welcome to the three hundred and tenth 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 https://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.
If you're at the RISC-V Summit this week, be sure to drop by the lowRISC Booth and say hello.
News and articles from around the web
LLVM 9.0.1-rc2 has been tagged.
On the mailing lists
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Hans Wennborg has shared the proposed 10.0.0 release schedule. This would see a branch taking place on 15th January with the target date for the final being 25th Feb 2020.
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Kristof Beyls is seeking program comittee volunteers for EuroLLVM 2020.
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Gábor Horváth wrote an RFC proposing function annotations as a next step in the effort to implement Herb Sutter's lifetime analysis. The proposed annotations would give information about the lifetime of function return values or output arguments.
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Michael Woerister fed back that as far as he's aware, profile-guided optimisation now works exactly as expected with Rust.
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Sander De Smalen is working to set up SVE/SVE2 LLVM sync-up calls. The first will take place on Thursday 12th Dec at 4pm GMT.
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Dmitri Gribenko reports that he's set up a new buildbot with the new pass manager enabled.
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Brian Gesiak kicked off an RFC discussion on potentially extending Clang to help identify wasteful template function bodies. This work would be motivated by a desire to help programmers identify ways to reduce compilation time.
LLVM commits
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The ARMCodeGenPrepare pass has graduated from the Arm backend to a generic TypePromotion pass. bc76dad.
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LLVM's documentation on contributing was expanded to discuss
git-clang-format. 06911ae. -
The LangRef was updated to clarify the behaviour of poison within vector elements. ead0d77.
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The MachineVerifier will now check that the operand type matches that of the descriptor. 4fd8f11.
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GlobalISel now allows targets to override how to widen constants during legalisation. 6da7dbb.
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The register coalescer was updated so that if it rematerialises a register, it only sets a subregsiter rather than the super-register, if possible. 2ec71ea.
Clang commits
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Concepts implementation work continues with the addition of enforcement for associated constraints and elaborated diagnostics on why constraints weren't satisfied. fdf80e8.
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The new SpacesInConditionalStatement option for clang-format will insert spaces inside the braces for if/for/while conditions. e.g.
if ( a ). 26748a3. -
Clang learned a
Wmisleading-indentationwarning. bc840b2. -
clang-tidy modernize-avoid-bind check was rewritten, adding significant new functionality. 64f74bf.