LLVM Project News and Details from the Trenches

Monday, March 9, 2015

LLVM Weekly - #62, Mar 9th 2015

Welcome to the sixty-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. 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@asbradbury.org, or @llvmweekly or @asbradbury on Twitter.

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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. See here for the list of mentoring organisations advertising LLVM-related projects. Please do help spread the word, applications open on Monday the 16th of March. I am biased, but I'd like to draw particular attention to the wide variety of lowRISC GSoC ideas, including a project to use tagged memory to provide protection against control-flow hijacking.

Ravi, a programming language based on Lua 5.3 has been announced. It features JIT compilation using LLVM, though in the current development version only a fraction of the Lua bytecodes are JIT-compiled.

On the mailing lists

LLVM commits

  • An initial implementation of a loop interchange pass has landed. This will interchange loops to provide a more cache-friendly memory access. r231458.

  • A high-level support library for the new pass manager has been added. r231556.

  • The LLVM performance tips document has seen some new additions. r230995, r231352.

  • DenseMapIterators will now fail fast when compiled in debug mode. r231035.

  • LowerBitSets will now use byte arrays rather than bit sets to represent in-memory bit sets, which can be looked up with only a few instructions. r231043.

  • Another large portion of the DebugInfo changes has landed. r231082.

  • A new optimisation for AddressSanitizer has been added that reduces the amount of instrumentation needed, eliminating it when accessing stack variables that can be proven to be inbounds. r231241.

  • llvm.frameallocate has been replaced with llvm.frameescape. r231386.

Clang commits

  • When the -pedantic flag is given, clang will warn when a format string uses %p with non-void* args. r231211.

  • Work on MS ABI support continues. Throwing a C++ exception under the MS ABI is now supported. r231328.

Other project commits

  • The lld resolver has had a significant performance optimisation. The commit message indicates linking chrome.dll now takes 30 seconds down from 70 seconds. r231434.

  • The static binary size of lldb-server has been reduced due to a reduction in the number of initialised components. r230963.

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