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The vendor-defined XTHeadMAC (no comparable standard extension exists at the time of writing) extension adds multiply accumulate instructions. It is supported by the C9xx cores (e.g., found in the wild in the Allwinner D1) by Alibaba T-Head. The current (as of this commit) public documentation for this extension is available at: https://github.com/T-head-Semi/thead-extension-spec/releases/download/2.2.2/xthead-2023-01-30-2.2.2.pdf Support for these instructions has already landed in GNU Binutils: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=4041e11db3ec3611921d10150572a92689aa3154 Co-authored-by: Philipp Tomsich <philipp.tomsich@vrull.eu> Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D143847
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============================
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LLVM |release| Release Notes
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============================
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.. contents::
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:local:
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.. only:: PreRelease
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.. warning::
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These are in-progress notes for the upcoming LLVM |version| release.
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Release notes for previous releases can be found on
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`the Download Page <https://releases.llvm.org/download.html>`_.
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Introduction
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============
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This document contains the release notes for the LLVM Compiler Infrastructure,
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release |release|. Here we describe the status of LLVM, including major improvements
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from the previous release, improvements in various subprojects of LLVM, and
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some of the current users of the code. All LLVM releases may be downloaded
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from the `LLVM releases web site <https://llvm.org/releases/>`_.
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For more information about LLVM, including information about the latest
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release, please check out the `main LLVM web site <https://llvm.org/>`_. If you
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have questions or comments, the `Discourse forums
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<https://discourse.llvm.org>`_ is a good place to ask
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them.
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Note that if you are reading this file from a Git checkout or the main
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LLVM web page, this document applies to the *next* release, not the current
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one. To see the release notes for a specific release, please see the `releases
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page <https://llvm.org/releases/>`_.
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Non-comprehensive list of changes in this release
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=================================================
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.. NOTE
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For small 1-3 sentence descriptions, just add an entry at the end of
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this list. If your description won't fit comfortably in one bullet
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point (e.g. maybe you would like to give an example of the
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functionality, or simply have a lot to talk about), see the `NOTE` below
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for adding a new subsection.
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* ...
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Update on required toolchains to build LLVM
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-------------------------------------------
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Changes to the LLVM IR
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----------------------
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* Typed pointers are no longer supported. See the `opaque pointers
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<OpaquePointers.html>`__ documentation for migration instructions.
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Changes to building LLVM
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------------------------
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Changes to TableGen
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-------------------
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Changes to Interprocedural Optimizations
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----------------------------------------
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Changes to the AArch64 Backend
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------------------------------
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Changes to the AMDGPU Backend
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-----------------------------
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Changes to the ARM Backend
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--------------------------
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- The hard-float ABI is now available in Armv8.1-M configurations that
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have integer MVE instructions (and therefore have FP registers) but
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no scalar or vector floating point computation.
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Changes to the AVR Backend
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--------------------------
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* ...
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Changes to the DirectX Backend
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------------------------------
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Changes to the Hexagon Backend
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------------------------------
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* ...
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Changes to the LoongArch Backend
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--------------------------------
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Changes to the MIPS Backend
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---------------------------
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* ...
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Changes to the PowerPC Backend
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------------------------------
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* ...
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Changes to the RISC-V Backend
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-----------------------------
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* Assembler support for version 1.0.1 of the Zcb extension was added.
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* Zca, Zcf, and Zcd extensions were upgraded to version 1.0.1.
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* vsetvli intrinsics no longer have side effects. They may now be combined,
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moved, deleted, etc. by optimizations.
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* Adds support for the vendor-defined XTHeadBa (address-generation) extension.
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* Adds support for the vendor-defined XTHeadBb (basic bit-manipulation) extension.
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* Adds support for the vendor-defined XTHeadBs (single-bit) extension.
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* Adds support for the vendor-defined XTHeadMac (multiply-accumulate instructions) extension.
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Changes to the WebAssembly Backend
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----------------------------------
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* ...
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Changes to the Windows Target
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-----------------------------
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Changes to the X86 Backend
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--------------------------
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Changes to the OCaml bindings
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-----------------------------
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Changes to the C API
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--------------------
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* ``LLVMContextSetOpaquePointers``, a temporary API to pin to legacy typed
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pointer, has been removed.
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Changes to the FastISel infrastructure
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--------------------------------------
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* ...
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Changes to the DAG infrastructure
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---------------------------------
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Changes to the Metadata Info
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---------------------------------
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Changes to the Debug Info
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---------------------------------
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* The DWARFv5 feature of attaching `DW_AT_default_value` to defaulted template
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parameters will now be available in any non-strict DWARF mode and in a wider
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range of cases than previously. (`D139953 <https://reviews.llvm.org/D139953>`_, `D139988 <https://reviews.llvm.org/D139988>`_)
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* The `DW_AT_name` on `DW_AT_typedef`s for alias templates will now omit defaulted
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template parameters. (`D142268 <https://reviews.llvm.org/D142268>`_)
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Changes to the LLVM tools
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---------------------------------
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Changes to LLDB
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---------------------------------
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* In the results of commands such as `expr` and `frame var`, type summaries will now
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omit defaulted template parameters. The full template parameter list can still be
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viewed with `expr --raw-output`/`frame var --raw-output`. (`D141828 <https://reviews.llvm.org/D141828>`_)
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Changes to Sanitizers
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---------------------
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Other Changes
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-------------
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External Open Source Projects Using LLVM 15
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===========================================
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* A project...
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Additional Information
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======================
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A wide variety of additional information is available on the `LLVM web page
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<https://llvm.org/>`_, in particular in the `documentation
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<https://llvm.org/docs/>`_ section. The web page also contains versions of the
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API documentation which is up-to-date with the Git version of the source
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code. You can access versions of these documents specific to this release by
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going into the ``llvm/docs/`` directory in the LLVM tree.
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If you have any questions or comments about LLVM, please feel free to contact
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us via the `Discourse forums <https://discourse.llvm.org>`_.
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