[llvm-dev] LLVM Weekly - #405, October 4th 2021

Alex Bradbury via llvm-dev llvm-dev at lists.llvm.org
Mon Oct 4 11:28:32 PDT 2021

LLVM Weekly - #405, October 4th 2021

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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
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
  covering the switch to SimpleRemoteEPC.

* Paul Robinson asks if [others would be interested in a tool to check
  TargetLibraryInfo against actual

* Chris Tetreault [warned of an SSL-related issue using arcanist to access
  This naturally reignited discussion on moving away from Phabricator. In
  a parallel thread, Mehdi Amini [summarised the two main identified
  from an Infrastructure Working Group meeting.

* Snehasish Kumar shared an RFC on [introducing a binary serialization format

* Mircea Trofin is seeking feedback from the LLVM community on [introducing a
  dependency on abseil into Google's benchmark
  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

* Jay Foad provide a summary of [recent work on enabling the machine verifier
  in more places in the pass pipeline and transitioning
  TwoAddressInstructionPass to
  Jay is seeking code reviews, comments, patches, advice, testing, etc.

* Jonas Paulsson details a [common
  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

## LLVM commits

* isSafeToMoveBefore was made less pessimistic.

* 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.

* As part of the SystemZ z/OS LLVM work, an initial GOFF assembly parser
  skeleton has been committed.

* New LLVM metadata helper functions `printTree` and `dumpTree` allow
  printing an MDNode in an easy to read tree shape.

## Clang commits

* A new `clang final` pragma was introduced, enabling warning on undefinition
  and re-definition of macros.

* clang-cl gained support for `#pragma warning(disable : N)` to disable
  warnings matching the specified integer identifier.

* `-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.

## Other project commits

* LLVM's libc gained implementations of the conditional variable functions
  defined in the C standard.

* libcxx's std::format implemented Unicode support.

* Min/max operations were added to the standard MLIR dialect.

* LLVM's OpenMP library now features libompd - the OpenMP debugging library.

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