LLVM Weekly - #395, July 26th 2021

Welcome to the three hundred and ninety-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 https://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 ‘undevs’ blog posted an article on understanding LLVM IR.

On the mailing lists

• Tom Stellard sent a reminder that the 13.x release branch will be created on Tuesday.

• Andy Wingo posted an RFC on supporting off-heap definitions for the WebAssembly target.

• LLVM GPU News #16 is out, covering GPU-related recent commits and discussions.

• ORC JIT Weekly #37 is out, covering updates on JITLink RISCV, Swift/Obj-C support, and ExecutionSession.

• In response to a question, Philip Reames provided a summary of related work on fuzzing LLVM IR passes.

LLVM commits

• LLVM’s Attributor gained AAPointerInfo, used to track the uses of a pointer and placing them in “bins” based on their offset from the base and access size. c2281f1.

• Initial support for RISC-V was added to JITLink. 0ad562b, c7c70f2.

• An ORC-runtime based MachO-Platform was added. bb5f97e.

• The llvm-elfabi and llvm-ifs tools were merged. 8b4acb0, 61fa9af, 6103fdf.

• RISC-V constant materialisation was improved for cases where lui+slli can be used to replace lui+addi+slli. 81efb82.

• llvm-dwp was refactored into a library. 403e67d, f8c6515.

• Constant-folding of constrained arithmetic intrinsics was added. 1c64b5d.

Clang commits

• A new ‘readability-suspicious-call-argument’ check was added to clang-tidy. 73e4b5c.

• Conversion rules for _ExtInt were implemented. 6bb042e.

• Half-precision floating point is now supported for RVV intrinsics. 77bb82d.

• --global-value-regex and --global-hex-value-regex were added to the update_cc_test_checks tool. 2f5b2ea, 5b0a948.

Other project commits

• ranges::common_view was implemented in libcxx. e5d8b93.

• An initial version of the LLDB ScriptedProcess process plugin was committed. 312b43d.

• MultiOpPatternRewriteDriver was introduced to MLIR, as a utility to help rewrite a supplied list of ops. 7932d21.

• The compiler-rt sanitizer’s .clang-format config was updated to allow up to 100 column lines. 5d1df6d.