[llvm-dev] LLVM Weekly - #259, December 17th 2018 (original) (raw)
Alex Bradbury via llvm-dev llvm-dev at lists.llvm.org
Mon Dec 17 09:12:35 PST 2018
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LLVM Weekly - #259, December 17th 2018
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Welcome to the two hundred and fifty-ninth 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
Jan Hubička wrote up a comparison of Firefox 64 built with GCC and Clang with LTO. As always with Jan's posts, it's a great read. One notable difference is that Clang-produced binaries are substantially larger (48% larger code section) because Clang does little to size-optimize cold regions. Also see the Hacker News thread for more discussion.
On the mailing lists
Johannes Doerfert shared an RFC on introducing transitive and abstract call sites in order to improve IPO in the presence of function pointers passed to runtime functions.
Oliver Giroux started a thread on extending libcxx for use in a CUDA C++ standard library. A key part of this proposal is the introduction of "freestanding" mode.
Anastasia Stulova started an RFC thread on fixing address spaces in C++ cast operators.
James Y Knight started discussing tag and branch naming in the git conversion prototype.
Johannes Doerfert started a thread discussing the fact stripPointerCasts can return a value with a different bit pattern to the input.
LLVM commits
A new signed fixed point multiplication intrinsic was introduced. r348912.
bugpoint will now search for 'opt', 'clang' and other executables from the LLVM build rather than just searching the user's PATH. r348734.
The AMDGPU backend gained a new pass to manage the mode register (currently just double precision floating point rounding mode). r348754.
Code-gen for RISC-V FMAs was added. r349023.
The PowerPC instruction definitions were refactored to differentiate between the different varieties of pseudo-instruction. r349044.
Clang commits
Try-catch blocks in constexpr fucntions are now supported, as proposed for C++20. r348789.
Clang learned to support
-frecord-command-line, which embeds the driver command-line in an ELF section in the output. r349155.
Other project commits
libcxx gained a new alternative version of std::function. r348812.
LLD now understands
--plugin-opt=emit-llvmwhich will combine all bitcode files and write the result to an output file without doing codegen. The Gold LTO plugin has the same option. r349198.Initial scaffolding was added to LLDB to recognise symbol files generated by breakpad. r348773.
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