LLVM Weekly - #189, Aug 14th 2017

Welcome to the one hundred and eighty-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 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

If you haven't submitted your talk/tutorial/BoF/panel proposal for the upcoming LLVM Dev Meeting, you have a little more time. Get your submission in by today, Monday 14th at 11:59PM PDT.

LLVM 5.0.0-rc2 has been tagged.

The call for papers for the LLVM in HPC worksohp at SC17 is still open.

On the mailing lists

• Marc-André Laperle has given an update on his prototype to implement indexing support in clangd.

• Brian Gesiak has posted an RFC on expanding -ftime-report to give more information about how time was spent in tasks such as preprocessing and template instantiation.

• Alex Bradbury has posted an RFC on the future of the va_arg instruction in LLVM IR. This RFC hopes to explore where va_arg can be used for more targets and be expanded to handle aggregates, as well as whether that's even a desirable direction.

• Kuba Mracek has proposed dropping the %T expansion in lit.

LLVM commits

• Assembler support has been added for ARMv8.3-A pointer authentication instructions. r310709.

• Assembler support has been added for the new release consistent and processor consistent loads in ARMv8.3-A. r310575.

• A basic RISCVAsmParser has landed. r310363.

• The TargetTransformInfo::isFoldableMemAccess hook has been removed, as its functionality is subsumed by isLegalAddressingMode. r310463.

• The AArch64 and ARM backends gained assembler support for the ARMv8.2a dot product instructions. (Question to my readers: Given Arm's recent rebranding, should that be Armv8.2a or armv8.2a instead?). r310480, r310701.

• A new "Restored" flag has been added to CalleeSavedInfo. r310619.

• Most AVX512 broadcast intrinsics have been removed and will be auto-upgraded when loaded old IR. r310725.

Clang commits

• The clang-proto-fuzzer tool has been created. This models a subset of C++ as a protobuf and uses libprotobuf-mutator to generate mutations. r310408.

• A couple of minor ABI differences between Clang and GCC related to move constructors and deleted copy constructors have been fixed. r310401.

• clang-tidy gained a new integer division check. r310589.

• clang-import-test gained a -dump-ir argument, which can be used to help test completions. r310318.

Other project commits

• A new tool has been added to LLDB to support Intel Processor Trace. r310261.

• AddressSanitizer now supports Fuchsia. r310431.

• Polly is now run "before-vectorizer" rather than at the beginning of the pass pipeline. The advantages of this move are explained in the commit message. r310319.