[LLVMdev] LLVM Weekly - #52, Dec 29th 2014

Eli Bendersky eliben at google.com
Mon Dec 29 07:42:14 PST 2014

Thanks for keeping running this, Alex. LLVM weekly is a great resource for
those weeks when you just don't have time to go through the full mailing
list archives.


On Mon, Dec 29, 2014 at 2:02 AM, Alex Bradbury <asb at asbradbury.org> wrote:

> LLVM Weekly - #52, Dec 29th 2014
> ===============================
> If you prefer, you can read a HTML version of this email at
> <http://llvmweekly.org/issue/52>.
> Welcome to the fifty-second 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.
> This issue marks the end of one full year of LLVM Weekly. It's a little
> shorter than usual as the frenetic pace of LLVM/Clang development has
> slowed
> over the holiday period. Surprising even to me is that we managed to make
> it
> all 52 weeks with an issue every Monday as promised. This requires a
> non-trivial amount of time each week (2-3+ hours), but I am intending to
> keep
> it going into 2015. I'd like to give a big thank you to everyone who's
> said hi
> at a conference, sent in corrections or tips on content, or just sent a
> random
> thank you. It's been very helpful in motivation. I don't currently intend
> to
> change anything about the structure or content of each issue for next year,
> but if you have any ideas then please let me know.
> I can't make it to 31C3 due to the awkward timing of the event, but do let
> me
> know if there are any LLVM/Clang related talks worth sharing. There was a
> [talk about Code Pointer
> Integrity](https://events.ccc.de/congress/2014/Fahrplan/events/6050.html)
> which has previously been covered in LLVM Weekly and is working towards
> upstreaming. The video is [here](http://streaming.media.ccc.de/relive/6050
> ).
> If you're interested in [lowRISC](http://www.lowrisc.org) and at 31C3,
> Bunnie
> is leading a
> [discussion about
> it](https://events.ccc.de/congress/2014/wiki/Session:LowRISC_Discussion)
> at 2pm on Monday (today).
> ## News and articles from around the web
> There doesn't seem to have been any LLVM or Clang related news over the
> past
> week. Everyone seems to be busy with non-LLVM related activities over the
> christmas break. If you're looking for a job though, Codeplay tell me they
> have two vancancies: one for a [debugger
> engineer](
> https://www.codeplay.com/company/jobs/view.html?uid=15#.VJft5P84JA)
> and another for a
> [compiler engineer](
> https://www.codeplay.com/company/jobs/view.html?uid=12#.VJft7_84JA).
> ## On the mailing lists
> * David Li has shared some [early info on Google's plans for
> LTO](http://article.gmane.org/gmane.comp.compilers.llvm.devel/80167). He
> describes the concept of 'peak optimization performance' and some of the
> objectives of the new design. This includes the ability to handle programs
> 10x
> or 100x the size of Firefox. We can expect more information in 2015, maybe
> as
> early as January.
> * The discussion on possible approaches to reducing the size of libLLVM has
> continued. Chris Bieneman has [shared some more size
> stats](http://article.gmane.org/gmane.comp.compilers.llvm.devel/80096).
> These
> gains come from removing unused intrinsics. Chandler Carruth has followed
> up
> with a pleasingly thought-provoking argument on a different approach:
> [target-specific intrinsics shouldn't exist in the LLVM front or
> middle-end](http://article.gmane.org/gmane.comp.compilers.llvm.devel/80130
> ).
> He describes the obvious issues with this, with the most fiddly probably
> being
> instruction selection converting appropriate IR to the right
> target-specific
> functionality.
> ## LLVM commits
> * The SROA (scalar replacement of aggregates) pass has seen some
> refactoring
> to, in the future, allow for more intelligent rewriting.
> [r224742](http://reviews.llvm.org/rL224742),
> [r224798](http://reviews.llvm.org/rL224798).
> * The masked load and store intrinsics have been documented.
> [r224832](http://reviews.llvm.org/rL224832).
> * CodeGenPrepare learned to speculate calls to llvm.cttz/ctlz (count
> trailing/leading zeroes) if `isCheapToSpeculateCtlz/isCheapToSpeculatCttz`
> in
> TargetLowering return true. [r224899](http://reviews.llvm.org/rL224899).
> ## Clang commits
> * The Clang internals manual has been extended with stub sections on Parse,
> Sema, and CodeGen. [r224894](http://reviews.llvm.org/rL224894).
> ## Other project commits
> * The libcxx LIT test-suite has seen a number of new configuration options.
> Even better, these are [now documented](
> http://libcxx.llvm.org/lit_usage.html).
> [r224728](http://reviews.llvm.org/rL224728).
> _______________________________________________
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