Alex Bradbury via llvm-dev
2016-Mar-14 11:51 UTC
[llvm-dev] LLVM Weekly - #115, Mar 14th 2016
LLVM Weekly - #115, Mar 14th 2016 ================================ If you prefer, you can read a HTML version of this email at <http://llvmweekly.org/issue/115>. Welcome to the one hundred and fifteenth 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. We have an LLVM-related research position currently being [advertised here at the University of Cambridge Computer Lab](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096751.html). If you'd like an informal chat about what it's like working in this group or on this project please don't hesitate to get in touch with me. ## News and articles from around the web LLVM and Clang 3.8 have now been released. Check out the [LLVM](http://llvm.org/releases/3.8.0/docs/ReleaseNotes.html) and [Clang](http://llvm.org/releases/3.8.0/tools/clang/docs/ReleaseNotes.html) release notes for a run-down of the new features. It's GDC this week and if you're attending you may be interested that there's an [LLVM meetup scheduled for Thursday](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096446.html). Felix Angell has a detailed blog post introducing [generating LLVM IR from Go](https://blog.felixangell.com/an-introduction-to-llvm-in-go/). ## On the mailing lists * Jason Henline has posted a very detailed RFC on [creating a new parallel runtime library](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096576.html). StreamExecutor wraps both the CUDA and OpenCL runtimes and is used internally at Google. * Ed Maste has shared an update on [linking the FreeBSD base system using LLD](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096449.html). With a few workarounds, the full amd64 FreeBSD system is now buildable. * Vedant Kumar has shared an [RFC on removing redundant profile counter updates](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096643.html). * Sean Silva is seeking to [formalize the 'revert for more design review policy'](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096529.html). Overall, the comments seem to be positive. * With EuroLLVM coming up this week, people have been advertising their birds of a feather sessions. e.g. the [LLVM on PowerPC and SystemZ](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096667.html) session and the session on [surviving downstream](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096638.html). * Rafael Espíndola reports that compilation with LLVM and Clang has been [getting slower over time](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096488.html). Hal Finkel has some good input on [potential areas for improvement](http://lists.llvm.org/pipermail/llvm-dev/2016-March/096491.html). ## LLVM commits * Loop invariant code motion learnt the ability the exploit the fact a memory location is known to be thread-local. [r263072](http://reviews.llvm.org/rL263072). * A new `llvm.experimental.deoptimize` intrinsic has been added. [r26328](http://reviews.llvm.org/rL263281). * A ThinLTOCodeGenerator was added in order to provide a proof-of-concept implementation. [r262977](http://reviews.llvm.org/rL262977). * The Sparc backend gained support for co-processor condition branching and conditional traps. [r263044](http://reviews.llvm.org/rL263044). ## Clang commits * Clang gained support for the `[[nodiscard]]` attribute. [r262872](http://reviews.llvm.org/rL262872). * New AST matchers were added for addrLabelExpr, atomicExpr, binaryCondtionalOperator, designatedINitExpr, designatedInitExpr, designatorCountIs, hasSyntacticForm, implicitValueINitExpr, labelDecl, opaqueValueExpr, parenListExpr, predefinedExpr, requiresZeroInitialization, and stmtExpr. [r263027](http://reviews.llvm.org/rL263027). ## Other project commits * Error and warning messages in LLD are now more consistent. [r263125](http://reviews.llvm.org/rL263125). * Documentation on the new ELF and COFF LLD linkers has been updated. [r263336](http://reviews.llvm.org/rL263336).