LLVM Weekly - #149, Nov 7th 2016
Welcome to the one hundred and forty-ninth 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.
News and articles from around the web
The LLVM Developers' Meeting was a huge success last week. Thank you to everyone involved for making it such a great event. Talks were recorded, though I don't know the expected timeline for them being posted online.
The PVS-Studio folks have written up a blog post on bugs in LLVM's implementation found using PVS-Studio.
On the mailing lists
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Initial results from the survey on the move to GitHub have been shared, both from Renato and from Mehdi.
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Graham Hunter from ARM has shared a monster patch and design document for supporting ARM's Scalable Vector Extension in LLVM. This will be split up in to smaller patches for code review.
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I wrote up an RFC based on the lightning talk I did back in September at the LLVM Cauldron. Improving the experience of first-time LLVM contributors. The proposal is essentially that a small group of volunteers (or 'first responders' work together to improve the experience of first-time contributors by putting aside time to review the patches from newcomers in particular. From the discussion in the BoF on 'raising the next generation of LLVM developers', it sounds like Chandler Carruth has been thinking along similar lines.
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Sanjoy Das has proposed dropping support for old-style scalar TBAA. If this would pose a problem for you, now is the time to speak up.
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John Regehr is interested in reports from anyone who implemented optimisations derived by Souper.
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The thread posted in preparation for the Birds of a Feather session on debug info evolved to discuss the challenges of debug info for VLIW targets.
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Zachary Turner's proposed general purpose type-safe formatting library now has a prototype implementation. He revised it further after feedback.
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The thread on changing the LLVM license has seen a flurry of activity this week, mostly discussing the proposed exception to Apache's attribution requirements.
LLVM commits
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Documentation for Global ISel has been written and committed. r286002.
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The first patches of my RISC-V backend have begun to land. r285707, r285708, r285712, r285769, r285770.
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The OperandMatchResultTy enum is now part of MCTargetAsmParser.h rather than emitted through tablegen. Out-of-tree backends will want to make a matching adjustment. r285705.
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Instruction selection lowering for AVR has been added. r285790.
Clang commits
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The new
-cl-extoption can be used to override supported OpenCL extensions. -
Clang-side changes for the X86 'regcall' calling convention have been committed. r285849.
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The tests for the libclang python bindings (cindex.py) now pass with Python 3. r285909.
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The new readability-redundant-declaration checker will find redundant variable and function declarations. r285689.