[llvm-dev] LLVM Weekly - #176, May 15th 2017

[Alex Bradbury via llvm-dev]

LLVM Weekly - #176, May 15th 2017
=================================

If you prefer, you can read a HTML version of this email at
<http://llvmweekly.org/issue/176>.

Welcome to the one hundred and seventy-sixth 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

Version 0.6 of the Julia programming language is nearing release (currently at
rc1), and has [many changes and new
features](https://github.com/JuliaLang/julia/blob/v0.6.0-rc1/NEWS.md).

The LLVM Foundation recently [celebrated its 3rd
birthday](https://twitter.com/tonic888/status/860575293152428032).


## On the mailing lists

* It's getting close to the point where GlobalISel is enabled for -O0 on
AARch64. Kristof Beyls has [updated his benchmark
results](http://lists.llvm.org/pipermail/llvm-dev/2017-May/112837.html).

* Daniel Neilson has written a new RFC on [element-atomic memory
intrinsics](http://lists.llvm.org/pipermail/llvm-dev/2017-May/112779.html).

* Jorge Gorbe Moya has written an RFC on [adding new outputs to the clang
-save-temps
option](http://lists.llvm.org/pipermail/cfe-dev/2017-May/053811.html),
specifically generating both unoptimized and optimized textual LLVM IR.

* Sjoerd Meijer has written an RFC on [supporting `_Float16` in Clang for
ARMv8.2-A](http://lists.llvm.org/pipermail/cfe-dev/2017-May/053768.html).

* Hiroshi Inoue has written an RFC on [improving scalar replacement of
aggregates for method
arguments](http://lists.llvm.org/pipermail/llvm-dev/2017-May/112842.html).

* Andrew Kaylor is seeking advice and feedback on his efforts to [support the
`FENV_ACCESS`
pragma](http://lists.llvm.org/pipermail/llvm-dev/2017-May/112915.html).


## LLVM commits

* The parallel algorithm support code introduced in LLD has now been moved to
LLVM. [r302748](http://reviews.llvm.org/rL302748).

* A new LiveRangeShrink pass was added to move instructions within a basic
block in a way that minimises the live range.
[r302938](http://reviews.llvm.org/rL302938).

* A new custom event logging intrinsic was introduced for XRay.
[r302405](http://reviews.llvm.org/rL302405).

* A new variant of computeKnownBits has been added, with an easier to use
interface. [r302437](http://reviews.llvm.org/rL302437),
[r302925](http://reviews.llvm.org/rL302925).

* Experimental intrinsics have been added for horizontal vector reductions.
They can be used on AArch64.
[r302514](http://reviews.llvm.org/rL302514),
[r302678](http://reviews.llvm.org/rL302678).

* An extra operand has been added to the `CALLSEQ_START` SelectionDAG node to
track the stack size. [r302527](http://reviews.llvm.org/rL302527).

* Attributes can now be set on global variables in LLVM IR.
[r302794](http://reviews.llvm.org/rL302794).

* A profile-based cost analysis for partial inlining has been implemented.
[r302967](http://reviews.llvm.org/rL302967).


## Clang commits

* A handy new typo heuristic has been added to give better feedback if a
template identifier has been mistyped.
[r302615](http://reviews.llvm.org/rL302615).

* A new builtin, `__xray_customevent()`, has been added to support the XRay
custom event logging intrinsic. [r302492](http://reviews.llvm.org/rL302492).


## Other project commits

* The placement of orphan sections in LLD has been significantly optimised.
[r302903](http://reviews.llvm.org/rL302903).

* LLDB's Error class has been renamed to Status.
[r302872](http://reviews.llvm.org/rL302872).