[llvm-dev] LLVM Weekly - #104, Dec 28th 2015

Alex Bradbury via llvm-dev llvm-dev at lists.llvm.org
Mon Dec 28 07:44:48 PST 2015

LLVM Weekly - #104, Dec 28th 2015

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Welcome to the one hundred and fourth 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 [schedule for the LLVM devroom at FOSDEM](http://llvm.org/devmtg/2016-01/)
has been published. This will be on January 30th 2016 in Brussels at

Andy Finnell spent some time over the Christmas vacation porting the LLVM
Kaleidoscope tutorial to Erlang and has kindly [shared the fruits of his

Richard Pennington has written another blog post about ELLCC, this time about
[using it to cross-compile the Linux kernel for the Raspberry

Tim Jones (lecturer at the University of Cambridge Computer Laboratory) has
written about the [alias analysis used in the HELIX
There's nothing LLVM-specific here, indeed it was implemented using ILDJIT but
should be of general interest to compiler developers.

## On the mailing lists

* Keno Fischer has posted a [proposal for multi-location debug info support in
LLVM IR](http://lists.llvm.org/pipermail/llvm-dev/2015-December/093535.html).
This would allow, for instance, modelling when a variable is available either
on the stack or in a register.

* Adam Nemet is proposing to [extend the PowerPC software prefetching pass to
work on other
specifically AArch64.

* Russel Wallace asks for [advice on finding all pointers to
and had a number of suggestions in response.

* For a while now, Galina Kistanova has been posting [statistics from the LLVM
This includes the number of commits for each project, the number of failed
builds, and average build time. I haven't linked to it before, so felt I
should rectify that.

## LLVM commits

* An initial implementation of an LLVMCodeView library has landed. This
implements support for emitting debug info in the CodeView format.

* lit has gained support for a per-test timeout which can be set using
`--timeout=`. [r256471](http://reviews.llvm.org/rL256471).

* All uses of edge wights in BranchProbabilityInfo have been replaced with
probabilities. [r256263](http://reviews.llvm.org/rL256263).

* The LLVM project documentation on patch reviews via Phabricator now has
advice on choosing reviewers. [r256265](http://reviews.llvm.org/rL256265).

* The gc.statepoint intrinsic's return type is now a token type rather than
i32. [r256443](http://reviews.llvm.org/rL256443).

## Clang commits

* ASTtemplateKWAndArgsInfo and ASTTemplateArgumentListInfo have been converted
to use the TrailingObjects header. This abstracts away `reinterpret_cast`,
pointer arithmetic, and size calculations needed for the case where a class
has some other objects appended to the end of it.

## Other project commits

* Development of LLD's new ELF linker is continuing, with support for new
relocations on x86, x86-64, and MIPS.

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