058c5dfc78
As raised here: https://lists.llvm.org/pipermail/llvm-dev/2021-November/153881.html Now that VS2022 is on general release, LLVM is expected to build on VS2017, VS2019 and VS2022, which is proving hazardous to maintain due to changes in behaviour including preprocessor and constexpr changes. Plus of the few developers that work with VS, many have already moved to VS2019/22. This patch proposes to raise the minimum supported version to VS2019 (16.x) - I've made the hard limit 16.0 or later, with the soft limit VS2019 16.7 - older versions of VS2019 are "allowed" (at your own risk) via the LLVM_FORCE_USE_OLD_TOOLCHAIN cmake flag. Differential Revision: https://reviews.llvm.org/D114639
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=========================
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LLVM 14.0.0 Release Notes
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=========================
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.. contents::
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:local:
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.. warning::
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These are in-progress notes for the upcoming LLVM 14 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 14.0.0. 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 `LLVM Developer's Mailing List
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<https://lists.llvm.org/mailman/listinfo/llvm-dev>`_ is a good place to send
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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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.. NOTE
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If you would like to document a larger change, then you can add a
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subsection about it right here. You can copy the following boilerplate
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and un-indent it (the indentation causes it to be inside this comment).
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Special New Feature
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-------------------
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Makes programs 10x faster by doing Special New Thing.
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* ...
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Changes to the LLVM IR
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----------------------
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* Using the legacy pass manager for the optimization pipeline is deprecated and
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will be removed after LLVM 14. In the meantime, only minimal effort will be
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made to maintain the legacy pass manager for the optimization pipeline.
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* Max allowed integer type was reduced from 2^24-1 bits to 2^23 bits.
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* Max allowed alignment was increased from 2^29 to 2^32.
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Changes to building LLVM
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------------------------
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* Building LLVM with Visual Studio now requires version 2019 or later.
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Changes to TableGen
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-------------------
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Changes to the AArch64 Backend
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------------------------------
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* Added support for the Armv9-A, Armv9.1-A and Armv9.2-A architectures.
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* The compiler now recognises the "tune-cpu" function attribute to support
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the use of the -mtune frontend flag. This allows certain scheduling features
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and optimisations to be enabled independently of the architecture. If the
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"tune-cpu" attribute is absent it tunes according to the "target-cpu".
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Changes to the ARM Backend
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--------------------------
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* Added support for the Armv9-A, Armv9.1-A and Armv9.2-A architectures.
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* Added support for the Armv8.1-M PACBTI-M extension.
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Changes to the MIPS Target
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--------------------------
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During this release ...
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Changes to the Hexagon Target
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-----------------------------
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* ...
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Changes to the PowerPC Target
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-----------------------------
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During this release ...
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Changes to the X86 Target
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-------------------------
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During this release ...
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* Support for ``AVX512-FP16`` instructions has been added.
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Changes to the AMDGPU Target
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-----------------------------
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During this release ...
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Changes to the AVR Target
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-----------------------------
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During this release ...
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Changes to the WebAssembly Target
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---------------------------------
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During this release ...
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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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* ``LLVMSetInstDebugLocation`` has been deprecated in favor of the more general
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``LLVMAddMetadataToInst``.
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Changes to the Go bindings
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--------------------------
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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 Debug Info
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---------------------------------
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During this release ...
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Changes to the LLVM tools
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---------------------------------
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* llvm-cov: `-name-allowlist` is now accepted in addition to `-name-whitelist`.
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`-name-whitelist` is marked as deprecated and to be removed in future
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releases.
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Changes to LLDB
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---------------------------------
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* A change in Clang's type printing has changed the way LLDB names array types
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(from ``int [N]`` to ``int[N]``) - LLDB pretty printer type name matching
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code may need to be updated to handle this.
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* The following commands now ignore non-address bits (e.g. AArch64 pointer
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signatures) in address arguments. In addition, non-address bits will not
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be shown in the output of the commands.
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* ``memory find``
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* ``memory read``
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* ``memory tag read``
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* ``memory tag write``
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* The ``memory read`` command has a new option ``--show-tags``. Use this option
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to show memory tags beside the contents of tagged memory ranges.
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Changes to Sanitizers
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---------------------
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External Open Source Projects Using LLVM 14
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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 `mailing lists <https://llvm.org/docs/#mailing-lists>`_.
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