[llvm-dev] LLVM Weekly - #159, Jan 16th 2017

Alex Bradbury via llvm-dev llvm-dev at lists.llvm.org
Mon Jan 16 06:02:08 PST 2017

LLVM Weekly - #159, Jan 16th 2017

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Welcome to the one hundred and fifty-ninth 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

Erik Corry has written up the details of an exciting experiment to [compile
Dart code using LLVM](https://medium.com/dartlang/dart-on-llvm-b82e83f99a70).

John Regehr has written up a great explanation of [how LLVM is

In the context of [recent
news](https://www.tesla.com/blog/welcome-chris-lattner), Alex Rosenberg has
[reiterated Apple's commitment to LLVM, Clang, and open

Alessandro Di Federico has written "yet another" Python binding for LLVM,

Registration is [now
open](http://lists.llvm.org/pipermail/llvm-dev/2017-January/108889.html) for
EuroLLVM 2017. This will be held March 27-28 in Saarbr├╝cken (Germany). The
deadline to submit a talk, workshop or BoF proposal is January 27th.

## On the mailing lists

* Hal Finkel and Xinmin Tian have created an extensive proposal for adding
[IR-level region
It is intended to be used to represent directives for parallelization,
vectorization. The proposal spawned lots of discussion. Vikram Adve is
concerned the [parallel IR extensions may not be sufficiently

* Mehdi Amini has helpfully [summarised the current status of the LLVM git

* Quentin Colombet has proposed that [GlobalISel be built by
GlobalISel of course isn't used by default, so the main impact would be a
slightly higher LLVM build time and larger binary size. Renato Golin [raised

* Paul Robinson started a discussion about [repurposing the 'optnone'
so it explicitly matches the behaviour of -O0.

* Hans Wennborg reports that the [4.0.0 release has now
This means the releases process has started and a first release candidate
should be available shortly.

* Francois Fayard is curious about [what options have been investigated for
LLVM's DenseMap hash
He followed up with [some benchmarks from experimenting with different hash

* Shiva Chen has proposed a [new LLVM backend for the AndesTech NDS32 V3

## LLVM commits

* The processing of `@llvm.assume` intrinsics has been made more efficient.

* The llvm-xray tool now supports trace file conversion and function call
accounting (generating basic statistics based on logs).

* The 'googlemock' component of Google Test has been imported into the LLVM
source tree. [r291606](http://reviews.llvm.org/rL291606).

* The loop invariant code motion pass learnt to emit optimisation remarks.

* The loop pass manager has seen a major redesign.

* Functionality for accessing XRay trace logs is now exposed in
`include/llvm/XRay/Trace.h`. [r291651](http://reviews.llvm.org/rL291652).

## Clang commits

* The `diagnose_if` attribute is now supported. This can be used to have clang
emit a particular warning or error for function invocations that meet the
given conditions. [r291418](http://reviews.llvm.org/rL291418).

* Clang will now track the source location of exception specifications.

* Support was added for warning about unused C++ lambda captures.

## Other project commits

* LLD gained support for the `-Map` option, allowing a link map to be
specified on the command line. [r291958](http://reviews.llvm.org/rL291958).

* libcxx can now be built against the debug MSVC runtimes.

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