LLVM Weekly - #535, April 1st 2024
Welcome to the five hundred and thirty-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. 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@asbradbury.org, @llvmweekly or @asbradbury on Twitter, or @llvmweekly@fosstodon.org or @asb@fosstodon.org.
News and articles from around the web and events
A fork of Clang that implements the P2996 C++ reflection specification is available, by Dan Katz and others at Bloomberg, amongst other contributors. See the previous link for information on the implementation choices and the /r/cpp discussion.
Bartosz Taudul blogged about pretty printing Arm Neon registers in LLDB.
According to the LLVM calendar in the coming week there will be the following:
- Office hours with the following hosts: Anastasia Stulova, Quentin Colombet, Johannes Doerfert.
- Online sync-ups on the following topics: Flang, MLIR C/C++ frontend, MemorySSA, new contributors, LLVM/offload, classic flang, loop optimisations, OpenMP in Flang, MLIR open meeting, PowerPC, HLSL.
- For more details see the LLVM calendar, getting involved documentation on online sync ups and office hours.
On the forums
Tom Stellard indicated that he’s now hoping to collate release notes for LLVM point releases, starting from 18.1.3.
If April fools jokes are your thing, you’ll enjoy this MLIR syntax proposal.
There were more discussions about criteria for LLVM commit access in light of the recent xz backdoor.
Noah Goldstein proposed supporting the
nnegflag foruitofp.Fangrui Song shared details of work on supporting
--compress-sectionsin llvm-objcopy.Matt Arsenault is seeking feedback on supporting atomicrmw with floating-point vector operations.
People are trying to get feedback on EuroLLVM round tables, e.g. for MLIR or on debuginfo (and perhaps others I missed).
LLVM commits
An alternative translation of
-wasm-enable-sjljwas implemented. 6420f37.TableGen’s implementation was restructured into a “Basic” and “Common” library. fa3d789.
The SPIRVUsage documentation was expanded. f5e1cd5.
The RISCVMakeCompressible pass learned to handle byte/half load/store for the Zcb extension. 22bfc58.
The
va_listrelated intrinsics were made generic, meaning arguments don’t have to be address space 0 pointers. ab7dba2.The language reference was expanded to better clarify some metadata semantics. eee8c61.
The
nuwandnswnowrap flags can now be used fortrunc. 7d3924c.
Clang commits
The
optin.performance.Paddingchecker from the Clang static analyzer was documented. b8cc838.Flexible arrays in unions or alone in structs are now allowed. 14ba782.
The
-Wformat-signednesswarning is now supported. ea92b1f.