LLVM Weekly - #63, Mar 16th 2015 =============================== If you prefer, you can read a HTML version of this email at <llvmweekly.org/issue/63>. Welcome to the sixty-third 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](asbradbury.org). Subscribe to future issues at <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 LLVM is taking part in [Google Summer of Code](developers.google.com/open-source/soc) as a mentoring organisation. Students can earn a $5500 stipend by working on open source projects over the summer, and applications upon today (March 16th). See [here](google-melange.com/gsoc/org/list/public/google/gsoc2015?tag=llvm) for the list of mentoring organisations advertising LLVM-related projects. Please do help spread the word. I am biased, but I'd like to draw particular attention to the wide variety of [lowRISC GSoC ideas](lowrisc.org/docs/gsoc-2015-ideas), including a project to implement an LLVM pass using tagged memory to provide protection against control-flow hijacking. Version 0.11 of Pocl, the portable open-source OpenCL implementation [has been released](article.gmane.org/gmane.comp.compilers.llvm.devel/83457). Additions in this release include initial Android support and MIPS architecture support. Version 1.11 of TCE, the TTA-based (Transport Triggered Architecture) Co-design Environment, which uses LLVM [has been released](article.gmane.org/gmane.comp.compilers.llvm.devel/83377). This release adds support for LLVM 3.6. There will be a [LLVM microconference](wiki.linuxplumbersconf.org/2015:llvm) at the Linux Plumbers Conference in August. There is a [call for speakers](article.gmane.org/gmane.comp.compilers.clang.devel/41706). ## On the mailing lists * If you enjoy bikesheds, this thread may be for you. Renato Golin has kicked off a [thread on commit message policy](article.gmane.org/gmane.comp.compilers.clang.devel/41760). * Rui Ueyama has posted to the mailing list [summarising his recent work on LLD performance improvements](article.gmane.org/gmane.comp.compilers.llvm.devel/83438). The follow up responses discuss potential remaining bottlenecks. * William Moses is [interested in parallel extensions to LLVM IR](article.gmane.org/gmane.comp.compilers.llvm.devel/83236), and the thread spawned quite a few interesting responses. * Mohammad Kazem's [question about counting loads and stores of variables](article.gmane.org/gmane.comp.compilers.llvm.devel/83224) elicited some useful responses. * Will Dietz who has been maintaining the [unofficial LLVM Github mirror](github.com/llvm-mirror) for the past few years is interested in [LLVM taking over the service 'officially'](article.gmane.org/gmane.comp.compilers.llvm.devel/83239). ## LLVM commits * As DataLayout is now mandatory, LLVM APIs have been updated to use references to DataLayout. [r231740](reviews.llvm.org/rL231740). * Support was added for part-word atomics on PowerPC. [r231843](reviews.llvm.org/rL231843). * Initial work on enhancing ValueTracking to infer known bits of a value from known-true conditional expressions has landed. [r231879](reviews.llvm.org/rL231879). * The PowerPC READMEs have been updated to list potential future enhancements. [r231946](reviews.llvm.org/rL231946). * The `llvm.eh.actions` intrinsic has been added. [r232003](reviews.llvm.org/rL232003). * The documentation for llvm-cov has been updated. [r232007](reviews.llvm.org/rL232007). * The getting started docs now describe CMake as the preferred way to build LLVM. [r232135](reviews.llvm.org/rL232135). * llvm-vtabledump is now known as llvm-cxxdump. [r232301](reviews.llvm.org/rL232301). ## Clang commits * The steady stream of OpenMP patches continues, with the addition of codegen support for the omp task directive and omp for. [r231762](reviews.llvm.org/rL231762), [r232036](reviews.llvm.org/rL232036). * Copy-constructor closures for MS ABI support has been added. [r231952](reviews.llvm.org/rL231952). ## Other project commits * LLD gained support for linker script expression evaluation and parsing of the MEMORY and EXTERN commands. [r231707](reviews.llvm.org/rL231707), [r231928](reviews.llvm.org/rL231928), [r232110](reviews.llvm.org/rL232110). * LLDB gained a `CODE_OWNERS.txt` file. [r231936](reviews.llvm.org/rL231936).