Alex Bradbury via llvm-dev
2018-Jun-25 09:55 UTC
[llvm-dev] LLVM Weekly - #234, June 25th 2018
LLVM Weekly - #234, June 25th 2018 ================================= If you prefer, you can read a HTML version of this email at <http://llvmweekly.org/issue/234>. Welcome to the two hundred and thirty-fourth 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](https://www.linkedin.com/in/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 at asbradbury.org>, or @llvmweekly or @asbradbury on Twitter. ## News and articles from around the web The next LLVM Sydney Users and Developers Meetup has been [announced](http://lists.llvm.org/pipermail/llvm-dev/2018-June/124123.html) for this Thursday 28th June. It will feature a deep-dive into LLVM IR and the C++ API. The [video recording](https://www.youtube.com/watch?v=8U0eKnZmNwM) of the 12th LLVM Social Berlin is now available. Stefan Gränitz talks about ThinLTO and Incremental JIT Compilation. ## On the mailing lists * Alan Davis is [seeking feedback](http://lists.llvm.org/pipermail/llvm-dev/2018-June/124154.html) on his proposed method of modeling pre/post increment/decrement addressing modes. No responses yet, but I'm sure there are others who are interested. * Vedant Kumar kicked off an RFC on [removing debug locations from ConstantSDNodes](http://lists.llvm.org/pipermail/llvm-dev/2018-June/124164.html). This generated a reasonable amount of discussion, which Vedant was kind enough to [summarise](http://lists.llvm.org/pipermail/llvm-dev/2018-June/124220.html). * Piotr Padlewski [reports](http://lists.llvm.org/pipermail/llvm-dev/2018-June/124153.html) that he's got a pair of devirtualisation patches up for review and is seeking help in getting them approved. These show an 80% performance boost in one microbenchmark, 0.7% on 7zip. * Duncan P. N. Exon Smith started an RFC thread on [whether SmallVectors should be smaller](http://lists.llvm.org/pipermail/llvm-dev/2018-June/124206.html). ## LLVM commits * TableGen support for SearchableTables was rewritten to rely on more generic primitives (GenericEnum, GenericTable, SearchIndex) which allow generating custom enums and tables with lookup functions. [r335225](https://reviews.llvm.org/rL335225). * The loop unswitching pass learned to perform partial unswitching. [r335156](https://reviews.llvm.org/rL335156), [r335203](https://reviews.llvm.org/rL335203). * It is now possible to have tied operands of different classes in aliases. [r334942](https://reviews.llvm.org/rL334942). * The WebAssembly tablegen definitions now describe two parallel instruction sets: register-based and stack-based. [r334985](https://reviews.llvm.org/rL334985). * The assembler directives added to support CodeView emission have been documented. [r335058](https://reviews.llvm.org/rL335058). * The new Instruction::getNextNonDebugInstruction() and skipDebugInfo(BasicBlock::iterator) helpers can be used to help skip debug instuctions. [r335083](https://reviews.llvm.org/rL335083). * foreach TableGen multiclasses can now depend on template arguments. [r335221](https://reviews.llvm.org/rL335221). ## Clang commits * A new protobuf-based fuzzer was added, supporting the generation of LLVM IR. [r335374](https://reviews.llvm.org/rL335374). * The Clang Static Analyzer gained the ability to report uninitialized fields after object construction. [r334935](https://reviews.llvm.org/rL334935). * A python tool for dumping and constructor header maps was checked in. [r335177](https://reviews.llvm.org/rL335177). ## Other project commits * UndefinedBehaviourSanitizer now supports reporting diagnostics to a monitor proces. [r335371](https://reviews.llvm.org/rL335371). * liboffload was removed from LLVM's openmp repository. [r335069](https://reviews.llvm.org/rL335069).