Alex Bradbury via llvm-dev
2016-Oct-10 15:57 UTC
[llvm-dev] LLVM Weekly - #145, Oct 10th 2016
LLVM Weekly - #145, Oct 10th 2016 ================================ If you prefer, you can read a HTML version of this email at <http://llvmweekly.org/issue/145>. Welcome to the one hundred and forty-fifth 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](http://asbradbury.org). 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. Today's issue is going out slightly later than usual I'm travelling back from [ORCONF](http://www.orconf.org) and have been stuck on networks that block SSH. We can now all breathe a sigh of relief, LLVM Weekly has managed to go out on the 145th consecutive Monday. ## News and articles from around the web Neil Henning has written up [part four](http://www.duskborn.com/adding-branching-mpc-llvm-for-the-neil-language-4/) of his series on the 'Neil' language. This post discusses adding branching support. Version 0.1.33 of ELLCC cross-compilation toolchain has [been released](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105772.html). This release includes version bumps for a number of the included libraries. ## On the mailing lists * Dylan McKay has shared an [update on the status of the AVR backend](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105737.html). Large parts of it have been merged now. * I've posted an update on the [status of the initial set of patches to add a RISC-V backend in LLVM](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105768.html). 6 are reviewed and ready to land, 3 have started the review process and awaiting signoff, while 2 remain unreviewed. More developer attention on Krzstof's Parzyszek's RFC on [adding variable-sized register classes](http://lists.llvm.org/pipermail/llvm-dev/2016-September/105027.html) would be appreciated. Over the weekend I've shared some thoughts on how this may interact with the parsing of register names (see [here](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105753.html) and [here](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105763.html)). * Hubert Tong has shared a [brief update on C++ concepts status](http://lists.llvm.org/pipermail/cfe-dev/2016-October/051056.html) in Clang. * Matthias Braun has created a [new script to compare LLVM test-suite runs](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105739.html). The aim is to enable quick comparison of a few runs without leaving the commandline. * As James Molloy [confirms](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105712.html), the plan is still to end support for compiling LLVM with MSVC 2013 next week. * In response to a question, Ryan Taylor has shared a [handy snippet](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105664.html) explaining how to handle memory-to-memory operations. * In response to a question about authoring a Z80 LLVM backend, Philipp Klaus Krause [pointed to](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105655.html) his experimental [LLVM+SDCC toolchain](https://sourceforge.net/p/sdcc/mailman/message/35382805/) which seems rather interesting. * Sebastian Pop has shared a [proposal for making the test-suite succeed with Ofast and ffp-contract=on](http://lists.llvm.org/pipermail/llvm-dev/2016-October/105730.html). ## LLVM commits * The new llvm-opt-report tool will generate source-annotated optimisation summaries. [r283398](http://reviews.llvm.org/rL283398). * WebAssembly has officially switched from being an AST to being a stack machine, and the in-tree comments have been updated accordingly. Adjustments to the implementation have also started. [r283154](https://reviews.llvm.org/rL283154), [r283501](http://reviews.llvm.org/rL283501). * The AVR machine code backend, frame lowering, and assembly printer was added. [r283297](http://reviews.llvm.org/rL283297), [r283311](http://reviews.llvm.org/rL283311), [r283623](http://reviews.llvm.org/rL283623). * New target hooks have been added for the LoadStoreVectorizer. [r283099](https://reviews.llvm.org/rL283099). * A new utility has been added to visualise optimisation records. It produces HTML from the YAML output generated from optimisation remarks. [r283571](http://reviews.llvm.org/rL283571). ## Clang commits * Builtins for coroutines intrinsics have been added. With this commit, simple coroutines can be created in plain C. [r283155](http://reviews.llvm.org/rL283155). * When optimising for size, loop rerolling is enabled by default. [r283685](http://reviews.llvm.org/rL283685). ## Other project commits * Support for MIPS64 was added to EfficiencySanitizer. [r283435](http://reviews.llvm.org/rL283435). * A tweak to hash computation in LLD has shaved of about 0.8 seconds when linking firefox with `-O2`. [r283367](http://reviews.llvm.org/rL283367). * A cross-platform minidump post-mortem debugging plugin has been added to LLDB. [r283259](http://reviews.llvm.org/rL283259).