Alex Bradbury via llvm-dev
2015-Dec-28 15:44 UTC
[llvm-dev] LLVM Weekly - #104, Dec 28th 2015
LLVM Weekly - #104, Dec 28th 2015 ================================ If you prefer, you can read a HTML version of this email at <http://llvmweekly.org/issue/104>. Welcome to the one hundred and 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](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. ## News and articles from around the web The [schedule for the LLVM devroom at FOSDEM](http://llvm.org/devmtg/2016-01/) has been published. This will be on January 30th 2016 in Brussels at [FOSDEM](https://fosdem.org/2016/). Andy Finnell spent some time over the Christmas vacation porting the LLVM Kaleidoscope tutorial to Erlang and has kindly [shared the fruits of his labours](http://losingfight.com/blog/2015/12/24/christmas-and-compilers/). Richard Pennington has written another blog post about ELLCC, this time about [using it to cross-compile the Linux kernel for the Raspberry Pi](http://ellcc.org/blog/?p=26435). Tim Jones (lecturer at the University of Cambridge Computer Laboratory) has written about the [alias analysis used in the HELIX compiler](http://www-dyn.cl.cam.ac.uk/~tmj32/wordpress/alias-analysis-in-helix/). There's nothing LLVM-specific here, indeed it was implemented using ILDJIT but should be of general interest to compiler developers. ## On the mailing lists * Keno Fischer has posted a [proposal for multi-location debug info support in LLVM IR](http://lists.llvm.org/pipermail/llvm-dev/2015-December/093535.html). This would allow, for instance, modelling when a variable is available either on the stack or in a register. * Adam Nemet is proposing to [extend the PowerPC software prefetching pass to work on other targets](http://lists.llvm.org/pipermail/llvm-dev/2015-December/093514.html), specifically AArch64. * Russel Wallace asks for [advice on finding all pointers to functions](http://lists.llvm.org/pipermail/llvm-dev/2015-December/093486.html), and had a number of suggestions in response. * For a while now, Galina Kistanova has been posting [statistics from the LLVM buildbots](http://lists.llvm.org/pipermail/llvm-dev/2015-December/093503.html). This includes the number of commits for each project, the number of failed builds, and average build time. I haven't linked to it before, so felt I should rectify that. ## LLVM commits * An initial implementation of an LLVMCodeView library has landed. This implements support for emitting debug info in the CodeView format. [r256385](http://reviews.llvm.org/rL256385). * lit has gained support for a per-test timeout which can be set using `--timeout=`. [r256471](http://reviews.llvm.org/rL256471). * All uses of edge wights in BranchProbabilityInfo have been replaced with probabilities. [r256263](http://reviews.llvm.org/rL256263). * The LLVM project documentation on patch reviews via Phabricator now has advice on choosing reviewers. [r256265](http://reviews.llvm.org/rL256265). * The gc.statepoint intrinsic's return type is now a token type rather than i32. [r256443](http://reviews.llvm.org/rL256443). ## Clang commits * ASTtemplateKWAndArgsInfo and ASTTemplateArgumentListInfo have been converted to use the TrailingObjects header. This abstracts away `reinterpret_cast`, pointer arithmetic, and size calculations needed for the case where a class has some other objects appended to the end of it. [r256359](http://reviews.llvm.org/rL256359). ## Other project commits * Development of LLD's new ELF linker is continuing, with support for new relocations on x86, x86-64, and MIPS. [r256143](http://reviews.llvm.org/rL256143), [r256144](http://reviews.llvm.org/rL256144), [r256172](http://reviews.llvm.org/rL256172), [r256416](http://reviews.llvm.org/rL256416).