[llvm-dev] LLVM Weekly - #276, April 15th 2019

[Alex Bradbury via llvm-dev]

LLVM Weekly - #276, April 15th 2019
===================================

If you prefer, you can read a HTML version of this email at
<http://llvmweekly.org/issue/276>.

Welcome to the two hundred and seventy-sixth 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

f18, the Fortran compiler and runtime project [has been accepted as part of
the LLVM
project](http://lists.llvm.org/pipermail/llvm-dev/2019-April/131703.html).

The MLIR (Multi-Level Intermediate Representation) project has been
[open-sourced](https://github.com/tensorflow/mlir), and will be proposed as an
LLVM subproject.

LLVM 7.1.0-final [has been
tagged](http://lists.llvm.org/pipermail/llvm-dev/2019-April/131724.html).


## On the mailing lists

* Peter Collingbourne
[reports](http://lists.llvm.org/pipermail/cfe-dev/2019-April/062028.html) on
his work to move automatic variable initialisation to constructors.

* Dmitri Gribenko
[summarised](http://lists.llvm.org/pipermail/cfe-dev/2019-April/062047.html)
an off-list discussion about adding lifetime analysis to Clang.

* Tom Stellard has posted the [proposed 8.0.1 release
schedule](http://lists.llvm.org/pipermail/llvm-dev/2019-April/131740.html).


## LLVM commits

* DbgEntityHistoryCalculate can now track multiple registers, increasing the
accuracy of debug info. [r358073](https://reviews.llvm.org/rL358073).

* New documentation was added on adding a constrained floating-point intrinsic.
[r358194](https://reviews.llvm.org/rL358194).

* The `LLVM_ENABLE_CXX1Y/Z` CMake flags were replaced with `LLVM_CXX_STD`.
[r357899](https://reviews.llvm.org/rL357899).

* A CRC32 implementation was added to the Support library.
[r357901](https://reviews.llvm.org/rL357901).

* AsmPrinter was refactored to remove AsmVariant, as it was only used for X86
and can be queried from a MachineInstr for that target
[r358101](https://reviews.llvm.org/rL358101).

* The RISC-V backend can now place data smaller than eight bytes into the small
data section, providing more opportunities for linker relaxation to optimise
accesses. [r358150](https://reviews.llvm.org/rL358150).


## Clang commits

* Clang gained parsing support for C++20 module declarations, import
declarations and the global and private module fragment.
[r358353](https://reviews.llvm.org/rL358353).

* Incorrect use of lookahead was removed from the `_Pragma` handling in the
preprocessor. [r358230](https://reviews.llvm.org/rL358230).


## Other project commits

* Comment lines of the form `//------` were removed en masse from the LLDB
codebase. [r358135](https://reviews.llvm.org/rL358135).

* LLVM's OpenMP implementation gained support for OpenMP 5.0 memory management.
[r357929](https://reviews.llvm.org/rL357929).