LLVM 22.0.0git Release Notes

Warning

These are in-progress notes for the upcoming LLVM 22.0.0git release. Release notes for previous releases can be found on the Download Page.

Introduction

This document contains the release notes for the LLVM Compiler Infrastructure, release 22.0.0git. Here we describe the status of LLVM, including major improvements from the previous release, improvements in various subprojects of LLVM, and some of the current users of the code. All LLVM releases may be downloaded from the LLVM releases web site.

For more information about LLVM, including information about the latest release, please check out the main LLVM web site. If you have questions or comments, the Discourse forums is a good place to ask them.

Note that if you are reading this file from a Git checkout or the main LLVM web page, this document applies to the next release, not the current one. To see the release notes for a specific release, please see the releases page.

Non-comprehensive list of changes in this release

  • …

Changes to the LLVM IR

  • The ptrtoaddr instruction was introduced. This instruction returns the address component of a pointer type variable but unlike ptrtoint does not capture provenance (#125687).

Changes to LLVM infrastructure

Changes to building LLVM

Changes to TableGen

Changes to Interprocedural Optimizations

  • Added -enable-machine-outliner={optimistic-pgo,conservative-pgo} to read profile data to guide the machine outliner (#154437).

Changes to Vectorizers

  • Added initial support for copyable elements in SLP, which models copyable elements as add , 0, i.e. uses identity constants for missing lanes.

  • SLP vectorizer supports initial recognition of FMA/FMAD pattern

Changes to the AArch64 Backend

Changes to the AMDGPU Backend

Changes to the ARM Backend

Changes to the AVR Backend

Changes to the DirectX Backend

Changes to the Hexagon Backend

Changes to the LoongArch Backend

Changes to the MIPS Backend

Changes to the PowerPC Backend

Changes to the RISC-V Backend

  • The loop vectorizer now performs tail folding by default on RISC-V, which removes the need for a scalar epilogue loop. To restore the previous behaviour use -prefer-predicate-over-epilogue=scalar-epilogue.

  • llvm-objdump now has basic support for switching between disassembling code and data using mapping symbols such as $x and $d. Switching architectures using $x with an architecture string suffix is not yet supported.

  • Ssctr and Smctr extensions are no longer experimental.

  • Add support for Zvfbfa (Additional BF16 vector compute support)

Changes to the WebAssembly Backend

Changes to the Windows Target

Changes to the X86 Backend

Changes to the OCaml bindings

Changes to the Python bindings

Changes to the C API

Changes to the CodeGen infrastructure

Changes to the Metadata Info

Changes to the Debug Info

Changes to the LLVM tools

  • llvm-readelf now dumps all hex format values in lower-case mode.

  • Some code paths for supporting Python 2.7 in llvm-lit have been removed.

Changes to LLDB

  • LLDB can now set breakpoints, show backtraces, and display variables when debugging Wasm with supported runtimes (WAMR and V8).

Changes to BOLT

Changes to Sanitizers

Other Changes

External Open Source Projects Using LLVM 22.0.0git

  • A project…

Additional Information

A wide variety of additional information is available on the LLVM web page, in particular in the documentation section. The web page also contains versions of the API documentation which is up-to-date with the Git version of the source code. You can access versions of these documents specific to this release by going into the llvm/docs/ directory in the LLVM tree.

If you have any questions or comments about LLVM, please feel free to contact us via the Discourse forums.