LLVM Project News and Details from the Trenches

Monday, March 24, 2014

LLVM Weekly - #12, Mar 24th 2014

Welcome to the twelfth 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

On the mailing lists

LLVM commits

  • The MIPS64r2-based Octeon CPU has been added. r204337.

  • The ProfileData library, discussed last week was committed. r204482, r204489.

  • The constant hoisting pass saw some refactoring and improvements. r204431, r204433, r204435, r204537.

  • The ARM integrated assembler learned how to handle the .thumb_set directive. r204059.

  • Assembler directives were added to create version-min load commands for iOS or Mac OSX. e.g. .ios_version_min 5,2,0. r204190.

  • It is now possible to specify the 'noduplicate' attribution for intrinsics. r204200.

  • The TableGen backends documentation was fleshed out a bit. r204479.

  • Scheduling annotations have been added to NEON AArch64 instructions. r204505.

Clang commits

  • Counters used in instrumentation-based profiling are now represented in a static array. This is the first commit of a larger project to reduce runtime overhead (initialization in particular) for instrumentation-based profiling. r204080. Other commits for instrumentation-based profiling include r204186, r204379, r204390. There's a matching set of commits in compiler-rt.

  • The deprecated -faddress-sanitizer, -fthread-sanitizer, and -fcatch-undefined-behavior flags were removed. Users whould use -fsanitize= instead. r204330.

  • Support for parsing the OpenMP safelen clause (for 'omp simd') was committed. r204428.

Other project commits

  • Support was added to MemorySanitizer for 'advanced origin tracking', which records all locations where an uninitialized value is stored to memory rather than just the creation point. r204152.

  • The lldb backtrace view has been changed to a process view where you can expand the process, its threads, and see all frames under each thread. r204251.

  • In compiler-rt, Google have re-licensed the Android ucontext implementation under the standard dual license of compiler-rt. r204128.

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