[llvm-dev] LLVM Weekly - #311, December 16th 2019 (original) (raw)
Alex Bradbury via llvm-dev llvm-dev at lists.llvm.org
Mon Dec 16 12:48:57 PST 2019
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LLVM Weekly - #311, December 16th 2019
If you prefer, you can read a HTML version of this email at <http://llvmweekly.org/issue/311>.
Welcome to the three hundred and eleventh 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 at asbradbury.org>, or @llvmweekly or @asbradbury on Twitter.
News and articles from around the web
All videos from the 2019 LLVM Developers' Meeting are now posted and available in a handy YouTube playlist.
LLVM 9.0.1-rc3 has been tagged.
On the mailing lists
Teresa Johnson shared an RFC on supporting agressive whole program devirtualization without -fvsibility=hidden.
Jonas Devlieghere wrote up an RFC on supporting Lua scripting in LLDB.
Sam McCall starts a discussion on providing network RPC in LLVM projects, and is seeking feedback on depending on external libraries like Thrift, grpc etc.
Sander De Smalen shares notes from last week's SVE sync-up call and the agenda for the next one.
Raphael Isemann shared a summary detailing the future of modern-type-lookup in LLDB. "modern-type-lookup is a flag that makes LLDB use
clang::ExternalASTMergerinstead of directly using theclang::ASTImportervia our ClangASTImporter wrapper."
LLVM commits
Initial matrix intrinsics and a lowering pass were added. 526244b.
Initial work related to profile guided size opimization was committed. This adds instrumentation, but doesn't yet enable size optimisation. d9ae493.
Support for a Vector Function Database was merged. 0be8196.
The Arm cost model now understands cases where a shift can be folded into other instructions. be7a107.
New tests were added for resolving of RISC-V relocations. 707e970.
Dead loop update instructions are now removed from Arm low overhead loops. d97cf1f.
getIntImmCost was renamed to getIntImmCostInst and getIntImmCostIntrin. 85ba5f6.
Target-specific intrinsic enums were split into separate headers. This saves 222MB of object file size in a Windows optimised+debug build. 5d98695.
Clang commits
A new TableGen backend was added for generating serialisation classes. 6404bd2, d505e57..
Clang support was added for constrained FP builtins. 6515c52.
Clang now defaults to
-fuse-init-array, using-fno-use-init-arrayonly for platforms known not to support.init_array. b2b5cac.Clang learned to synthesise defaulted comparison functions for C++20. cafc741.
Other project commits
A new script was added for symbolising hwasan reports after the fact. 9ef451d.
Fuzzing was added for parts of
<random>in libcxx. daacf57.
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