fc02eeb24f
The vendor-defined XTHeadBb (predating the standard Zbb extension) extension adds some bit-manipulation extensions with somewhat similar semantics as some of the Zbb 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 XTHeadBb is available from: 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=8254c3d2c94ae5458095ea6c25446ba89134b9da Depends on D143036 Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D143439
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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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* The Hexagon backend now support V71 and V73 ISA.
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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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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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