[LLVMdev] LLVM Weekly - #71, May 11th 2015

[Alex Bradbury]

LLVM Weekly - #71, May 11th 2015
================================

If you prefer, you can read a HTML version of this email at
<http://llvmweekly.org/issue/71>.

Welcome to the seventy-first 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 implementation of OpenMP 3.1 in Clang/LLVM is [now
complete](http://article.gmane.org/gmane.comp.compilers.clang.devel/42620).
Well done to everyone involved.

Most slides from the presentations at [EuroLLVM
2015](http://llvm.org/devmtg/2015-04/) are now online. Video is [coming
soon](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85455).

Version 3.5.1 of Clang UPC, the Unified Parallel C compiler has [been
released](http://clangupc.github.io/2015/04/15/clang-upc-3-5-1-0-announcment/).
The main change seems to be the move to Clang/LLVM 3.5.

The Pony Language, which features an LLVM backend has recently [been
released](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85486). It
received quite a lot of [discussion on Hacker
News](https://news.ycombinator.com/item?id=9482483).

Many readers might be interested in this [update from the last C++
standardization committee
meeting](http://www.reddit.com/r/cpp/comments/35g7f6/).

IBM have posted some bounties for [TSAN
support](https://www.bountysource.com/issues/11873163-enable-thread-sanitizer-for-ppc64)
and [MSAN
support](https://www.bountysource.com/issues/11872976-enable-memory-sanitizer-for-ppc64)
for PPC64.


## On the mailing lists

* Renato Golin has been asking about interest in [improving the LLVM online
code coverage
report](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85385).
Joshua Cranmer shared the work he did on [code coverage for Thunderbird and
Firefox](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85424).

* John Criswell has followed up on an older thread about the LLVM DSA work
giving [some useful
insight](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85380), and
[some more](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85461).

* Hubert Tong is interested in working on [implementing the C++ Concepts
Technical Specification in
Clang](http://article.gmane.org/gmane.comp.compilers.clang.devel/42564), and
would like anyone who's interested in collaborating or has already made a
start to get in touch.

* Quentin Colombet has posted a [heads-up about his shrink-wrap pass
work](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85322),
including details on how to enable support in your backend (in-tree or
out-of-tree).

* Last week's discussion about improving LLD has rumbled on. Chris Lattner
[suggested working on two
linkers](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85298), one
to serve the needs of those who primarily want a usable BSD-licensed system
linker and another a 'next generation' linker trying to meet the original aims
of LLD, developed without the same constraints on compatibility. Alex
Rosenberg gave a good [summary of the original aims of
LLD](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85247) and how
recent changes have moved it further from those aims. It looks like [a path
forwards is being
identified](http://article.gmane.org/gmane.comp.compilers.llvm.devel/85483).


## LLVM commits

* A new 'shrink-wrap' pass has been added. It attempts to insert the prologue
and epilogue of a function somewhere other than the entry/exit blocks. See the
commit message for a motivating example.
[r236507](http://reviews.llvm.org/rL236507).

* Support for the z13 processor and its vector capabilities have been added to
the SystemZ backend. [r236520](http://reviews.llvm.org/rL236520),
[r236521](http://reviews.llvm.org/rL236521).

* Documentation has been written for the new masked gather and scatter
intrinsics. [r236721](http://reviews.llvm.org/rL236721).

* The statepoint intrinsic has been extended to allow statepoints to be marked
as tranditions from GC-aware code to nonGC-aware code.
[r236888](http://reviews.llvm.org/rL236888).


## Clang commits

* Clang support for the z13 processor was added.
[r236531](http://reviews.llvm.org/rL236531).

* Thread-safe initialization using the MSVC 2015 ABI has been implemented.
[r236697](http://reviews.llvm.org/rL236697).

* User-friendly `-fsanitize-coverage=` flags are now available.
[r236790](http://reviews.llvm.org/rL236790).


## Other project commits

* libiomp's CMake has been integrated into the LLVM CMake build system, so you
can now checkout libiomp and have it built alongside llvm, clang and so on.
[r236534](http://reviews.llvm.org/rL236534).