[llvm-dev] LLVM Weekly - #308, November 25th 2019
Alex Bradbury via llvm-dev
llvm-dev at lists.llvm.org
Mon Nov 25 07:23:38 PST 2019
LLVM Weekly - #308, November 25th 2019
If you prefer, you can read a HTML version of this email at
Welcome to the three hundred and eighth 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
Videos from the LLVM Dev Meeting 2019
[continue to be
LLVM 9.0.1-rc1 [has been
The call for presentations for EuroLLVM 2020 [is now
The event will take place April 6-7 in Paris and proposals are due by Jan
## On the mailing lists
* Chandler Carruth kicked off a lengthy RFC thread on [moving towards Discord
for real time chat and Discourse for forum/list-style
This proposal follows discussions at the LLVM Dev Meeting and the Women in
Compilers and Tools meeting. This proposal has resulted in a large number of
responses. A number of people raised concerns about Discord as a proprietary
solution. Several respondents suggest it would be productive to separate
discussion of the real time chat and the forum solution.
* Eric Astor is [proposing to add MASM (Microsoft Macro Assembler)
to the LLVM MC layer.
* Bardia Mahjour shared [minutes from the loop optimisation working group Nov
* Sean Kilmurray posted an RFC on [adding a mock backend target to
which could be used to test assumptions like the size of bytes or addressable
* David Blaikie started a
both from a DWARF perspective and the LLVM implementation.
## LLVM commits
* A new API was introduced to determine if an instruction can be safely moved
before another instruction. [ae8a8c2](https://reviews.llvm.org/rGae8a8c2db6c).
* Scalable vector MVT size queries are now supported.
* llvm-objdump now prints relocation addends in hexadecimal, just like GNU
* Scheduling and cost models were added for the Exynos M5.
* TableGen will no longer error in the case of duplicate includes.
* The CMake build system was updated to explicitly mark libraries defined in
lib/ as "component libraries".
* The new gen-opt-rst TableGen backend will generate "command guides" for
common line options, for use in documentation.
## Clang commits
* Debug info size for Sema was reduced by adding an `anchor()` method,
resulting in a 17% saving for Sema object files on Windows and 14.6% on Linux.
* The new clang-tidy performance-no-automatic-move check will flag when
constructs prevent automatic move of local variables.
* `-ffixed-rN` can now be used to reserve r6-r11 on ARM.
* Support was added for `__attribute__((objc_direct))` and
## Other project commits
* LLVM libc now has a TableGen based header generator.
* LLDB gained a document describing caveats related to the usage of Python.
* LLDB now has some documentation on reproducers.
* The Archer tool was added to LLVM's OpenMP implementation. It provides TSan
annotations for OpenMP synchronisation.
More information about the llvm-dev