LLVM Weekly - #63, Mar 16th 2015
Welcome to the sixty-third 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. Subscribe to future issues at https://llvmweekly.org and pass it on to anyone else you think may be interested. Please send any tips or feedback to asb@asbradbury.org, or @llvmweekly or @asbradbury on Twitter.
News and articles from around the web
LLVM is taking part in Google Summer of Code as a mentoring organisation. Students can earn a $5500 stipend by working on open source projects over the summer, and applications upon today (March 16th). See here for the list of mentoring organisations advertising LLVM-related projects. Please do help spread the word. I am biased, but I'd like to draw particular attention to the wide variety of lowRISC GSoC ideas, including a project to implement an LLVM pass using tagged memory to provide protection against control-flow hijacking.
Version 0.11 of Pocl, the portable open-source OpenCL implementation has been released. Additions in this release include initial Android support and MIPS architecture support.
Version 1.11 of TCE, the TTA-based (Transport Triggered Architecture) Co-design Environment, which uses LLVM has been released. This release adds support for LLVM 3.6.
There will be a LLVM microconference at the Linux Plumbers Conference in August. There is a call for speakers.
On the mailing lists
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If you enjoy bikesheds, this thread may be for you. Renato Golin has kicked off a thread on commit message policy.
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Rui Ueyama has posted to the mailing list summarising his recent work on LLD performance improvements. The follow up responses discuss potential remaining bottlenecks.
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William Moses is interested in parallel extensions to LLVM IR, and the thread spawned quite a few interesting responses.
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Mohammad Kazem's question about counting loads and stores of variables elicited some useful responses.
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Will Dietz who has been maintaining the unofficial LLVM Github mirror for the past few years is interested in LLVM taking over the service 'officially'.
LLVM commits
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As DataLayout is now mandatory, LLVM APIs have been updated to use references to DataLayout. r231740.
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Support was added for part-word atomics on PowerPC. r231843.
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Initial work on enhancing ValueTracking to infer known bits of a value from known-true conditional expressions has landed. r231879.
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The PowerPC READMEs have been updated to list potential future enhancements. r231946.
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The
llvm.eh.actionsintrinsic has been added. r232003. -
The documentation for llvm-cov has been updated. r232007.
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The getting started docs now describe CMake as the preferred way to build LLVM. r232135.
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llvm-vtabledump is now known as llvm-cxxdump. r232301.
Clang commits
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The steady stream of OpenMP patches continues, with the addition of codegen support for the omp task directive and omp for. r231762, r232036.
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Copy-constructor closures for MS ABI support has been added. r231952.