LLVM Weekly - #115, Mar 14th 2016
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. 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@asbradbury.org, or @llvmweekly or @asbradbury on Twitter.
The canonical home for this issue can be found here at llvmweekly.org.
We have an LLVM-related research position currently being advertised here at the University of Cambridge Computer Lab. 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 and Clang 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.
Felix Angell has a detailed blog post introducing generating LLVM IR from Go.
On the mailing lists
Jason Henline has posted a very detailed RFC on creating a new parallel runtime library. 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. With a few workarounds, the full amd64 FreeBSD system is now buildable.
Vedant Kumar has shared an RFC on removing redundant profile counter updates.
Sean Silva is seeking to formalize the 'revert for more design review policy'. 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 session and the session on surviving downstream.
Rafael Espíndola reports that compilation with LLVM and Clang has been getting slower over time. Hal Finkel has some good input on potential areas for improvement.
LLVM commits
Loop invariant code motion learnt the ability the exploit the fact a memory location is known to be thread-local. r263072.
A new
llvm.experimental.deoptimizeintrinsic has been added. r26328.A ThinLTOCodeGenerator was added in order to provide a proof-of-concept implementation. r262977.
The Sparc backend gained support for co-processor condition branching and conditional traps. r263044.
Clang commits
Clang gained support for the
[[nodiscard]]attribute. r262872.New AST matchers were added for addrLabelExpr, atomicExpr, binaryCondtionalOperator, designatedINitExpr, designatedInitExpr, designatorCountIs, hasSyntacticForm, implicitValueINitExpr, labelDecl, opaqueValueExpr, parenListExpr, predefinedExpr, requiresZeroInitialization, and stmtExpr. r263027.