LLVM Weekly - #365, December 28th 2020

Welcome to the three hundred and sixty-fifth 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

Videos and slides are now available for the LLVM-HPC2020 Workshop at SC20.

A new post on the LLVM blog explains applications of Cling to data science research.

On the mailing lists

• LLVM GPU News Issue #2 is now available.

• Vince Bridgers asks about bugzilla database cleanup for static analyzer bugs.

• Fernando Magno Quintao Pereira shares that he is posting a short course on LLVM to YouTube.

• Christopher Nelson provided an update on OpenMP parallel STL status, and welcomes feedback on the linked work in progress.

LLVM commits

• The loop idiom recogniser learned about the "left-shift until bittest" idiom. e124844.

• Materialisation of i64 constants on PowerPC was improved. 29eb3dc.

• The HowToReleaseLLVM documentation was updated to match the current process. 7f40bb3.

• Further RISC-V vector intrinsics were added. b15ba2c, 7a2c8be, and many more.

• A bank conflict hazard recognizer was added to the Arm backend. It is enabled for the Cortex-M7. a9f14cd.

• Static heuristics for cold paths in branch probability info was improved. 9fb074e.

Clang commits

• clang-format now supports SpaceBeforeCaseColon which will add a space before the colon of a case or default statement. 47877c9.

• In order to reduce memory usage, clangd will now periodically call malloc_trim when using glibc malloc. b8c3715.

Other project commits

• An is-lockfree-runtime-function lit feature was added for libcxx testing. 0f81598.

• mlir-spirv-cpu-runner documentation was updated. be96137.

• Instance methods and static constructors were removed from MLIR's LLVMType, making it more closely match the rest of the MLIR infrastructure. 8de43b9, 7ed9cfc.