LLVM Weekly - #257, December 3rd 2018

Welcome to the two hundred and fifty-seventh 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 EuroLLVM call for participation is out. Talks, tutorials, student research competition entries, lightning talks, birds of a feather sessions, and posters are all encouraged. The submission deadline is January 13th. EuroLLVM will be held in Brussels on April 8th-9th.

On Wednesday 12th December, the Zurich LLVM Compiler Social will host a talk from Sebastian Ullrich "Towards Lean 4: An Optimized Object Model for an Interactive Theorem Prover". Register on meetup.com if you'd like to attend.

On the mailing lists

LLVM commits

Support was added for profile-driven cache prefetching on X86. r347596.

A new stack safety analysis was implemented. It determines if stack allocated variables can be considered "safe" from memory access bugs and can be used by sanitizers to avoid unnecessary instrumentation. r347612.

TableGen gained basic support for preprocessing directives (ifdef/else/endif/define). r347686.

InstSimplify learned to fold a select with an implied condition. r347896.

PatFrag predicate code can now access captured operands. r347992.

Codegen was implemented for cmpxchg on RISC-V RV32IA. This finishes the series of patches providing new target-independent hooks for late expansion of atomics as described in this RFC. r347914, r347971.

Clang commits

All analyzer config options will now be evaluated before analysis, allowing better error reporting. r348031, r348038.

clang-tidy got better at flagging narrowing conversions. r347570.

Other project commits