Alex Bradbury via llvm-dev
2021-Oct-04 18:28 UTC
[llvm-dev] LLVM Weekly - #405, October 4th 2021
LLVM Weekly - #405, October 4th 2021 =================================== If you prefer, you can read a HTML version of this email at <http://llvmweekly.org/issue/405>. Welcome to the four hundred and 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](https://www.linkedin.com/in/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 The LLVM Foundation have [announced](https://lists.llvm.org/pipermail/llvm-dev/2021-September/153009.html) an outdoor in-person event, the LLVM Bay Area Meetup, which will take place on October 20th. ## On the mailing lists * ORC JIT Weekly #40 [is out](https://lists.llvm.org/pipermail/llvm-dev/2021-October/153069.html), covering the switch to SimpleRemoteEPC. * Paul Robinson asks if [others would be interested in a tool to check TargetLibraryInfo against actual libraries](https://lists.llvm.org/pipermail/llvm-dev/2021-October/153052.html). * Chris Tetreault [warned of an SSL-related issue using arcanist to access Phabricator](https://lists.llvm.org/pipermail/llvm-dev/2021-September/153019.html). This naturally reignited discussion on moving away from Phabricator. In a parallel thread, Mehdi Amini [summarised the two main identified blockers](https://lists.llvm.org/pipermail/llvm-dev/2021-September/153034.html) from an Infrastructure Working Group meeting. * Snehasish Kumar shared an RFC on [introducing a binary serialization format for MemProf](https://lists.llvm.org/pipermail/llvm-dev/2021-September/153007.html). * Mircea Trofin is seeking feedback from the LLVM community on [introducing a dependency on abseil into Google's benchmark library](https://lists.llvm.org/pipermail/llvm-dev/2021-September/153022.html). See [google/branchmark#1183](https://github.com/google/benchmark/pull/1183) for the upstream discussion. * Noah Shutty shared plans on [building a debuginfod client and server library as part of the LLVM project](https://lists.llvm.org/pipermail/llvm-dev/2021-September/152953.html). * Jay Foad provide a summary of [recent work on enabling the machine verifier in more places in the pass pipeline and transitioning TwoAddressInstructionPass to LiveIntervals](https://lists.llvm.org/pipermail/llvm-dev/2021-October/153047.html). Jay is seeking code reviews, comments, patches, advice, testing, etc. * Jonas Paulsson details a [common problem](https://lists.llvm.org/pipermail/llvm-dev/2021-September/152988.html), where frontends neglect to add signext/zeroext as needed on an argument passed by register and suggested introducing a new structarg attribute, and then erroring in the backend if the parameter doesn't have signext/zeroext/structarg. ## LLVM commits * isSafeToMoveBefore was made less pessimistic. [c427727](https://reviews.llvm.org/rGc42772752a51). * The type promotion pass was enabled for AArch64, removing some unnecessary extends. [8a645fc](https://reviews.llvm.org/rG8a645fc44b54). * A number of in-tree tests were updated to use `-passes <passname>` to specify the pass pipeline in favour of the deprecated `-passname` arguments. [3f8027f](https://reviews.llvm.org/rG3f8027fb67bc). * As part of the SystemZ z/OS LLVM work, an initial GOFF assembly parser skeleton has been committed. [fb99424](https://reviews.llvm.org/rGfb99424a6f65). * New LLVM metadata helper functions `printTree` and `dumpTree` allow printing an MDNode in an easy to read tree shape. [475de8d](https://reviews.llvm.org/rG475de8da011c). ## Clang commits * A new `clang final` pragma was introduced, enabling warning on undefinition and re-definition of macros. [1e48ef2](https://reviews.llvm.org/rG1e48ef20358f). * clang-cl gained support for `#pragma warning(disable : N)` to disable warnings matching the specified integer identifier. [b2de52b](https://reviews.llvm.org/rGb2de52bec17b). * `-Wbool-operation` was extended to warn about bitwise AND of booleans with side effects. [f62d18f](https://reviews.llvm.org/rGf62d18ff140f). * clang-formatted-files.txt was checked in, which aims to list all files within LLVM that are unchanged when processed by clang-format. This list will be used to ensure changes to clang-format don't unexpectedly change its output. [5aca8bb](https://reviews.llvm.org/rG5aca8bb963a4). * clang-tidy now recognises `NOLINTBEGIN` and `NOLINTEND` comments to delimit regions where clang-tidy warnings should be suppressed. [c0687e1](https://reviews.llvm.org/rGc0687e1984a8). ## Other project commits * LLVM's libc gained implementations of the conditional variable functions defined in the C standard. [8379fc4](https://reviews.llvm.org/rG8379fc4a53cf). * libcxx's std::format implemented Unicode support. [ac7031b](https://reviews.llvm.org/rGac7031b2b2fa). * Min/max operations were added to the standard MLIR dialect. [9fb57c8](https://reviews.llvm.org/rG9fb57c8c1dd8). * LLVM's OpenMP library now features libompd - the OpenMP debugging library. [62fddd5](https://reviews.llvm.org/rG62fddd5ff5cd).