LLVM Weekly - #436, May 9th 2022

Welcome to the four hundred and thirty-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. 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, or @llvmweekly or @asbradbury on Twitter.

News and articles from around the web

The videos from the 2022 LLVM Performance Workshop at CGO are now available.

The 2022 Clang-built Linux meetup has opened its call for papers. It will take place 10-11 September in Dublin, Ireland.

GCC 12.1 was released.

On the forums

• Orlando Cazalet-Hyams proposed an RFC on assignment tracking - a better way of specifying variable locations in IR.

• Tanya Lattner shared that a code of conduct transparency report has been published.

• Artem Belevich sought opinions on conditional dependencies on proprietary tools (e.g. ptxas, Nvidia’s proprieatary assembler).

• Andrzej Warzynski is seeking input on an RFC about the coding style in the Flang driver, which currently uses a mixture of LLVM’s standard style as of 2 years ago and MLIR’s style.

• Alexandros Lamprineas provided an update on function specialisation.

• Mehdi Amini proposes updating the MLIR developer policy on the use of recursion.

• Csonkás Kristóf Gyula suggests adding a baremetal/none OS type.

• River Riddle shared a public service announcement on verification of SameOperandsAndResultType in MLIR being tightened.

LLVM commits

• Variable length instruction support was added to the decoder generator. 28e850a.

• Initial DXContainer parsing support was added. 4070aa0.

• Documentation on CMAKE_BUILD_TYPE was improved. 30e8796.

• New passes were introduced to add SPIR-V specific intrinsics. 0098f2a.

• The SLP (superword-level parallelism) Vectorizer had its reductions analyses improved. 7ea03f0.

• Native CPU detection, a scheduling model, and other definitions were added for the Ampere1 core. 64816e6, 7e02bc5.

Clang commits

• __builtin_dump_struct was reimplemented, and gained a number of new features. c4f95ef.

• The clang pseudo parser gained an implementation of the standard GLR parsing algorithm and a fuzzer. 9f38da2, 1616bd9.

• Exploded graph dumps and CFG dumps from the static analyzer are now enabled in release builds. 5ce7050, 29dff0d.

• -Wimplicit-int now defaults to an error in C99 and later. 2cb2cd2.

Other project commits

• The printf implementation in LLVM’s libc gained a printf writer and an index mode to its parser. e072a12, 945fa67.

• SystemZ support was added to libunwind. 364c502.