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5794a3620e
This is a followup to D98145: As far as I know, tracking of kill flags in FastISel is just a compile-time optimization. However, I'm not actually seeing any compile-time regression when removing the tracking. This probably used to be more important in the past, before FastRA was switched to allocate instructions in reverse order, which means that it discovers kills as a matter of course. As such, the kill tracking doesn't really seem to serve a purpose anymore, and just adds additional complexity and potential for errors. This patch removes it entirely. The primary changes are dropping the hasTrivialKill() method and removing the kill arguments from the emitFast methods. The rest is mechanical fixup. Differential Revision: https://reviews.llvm.org/D98294
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=========================
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LLVM 13.0.0 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 13 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 13.0.0. 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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* Windows Control-flow Enforcement Technology: the ``-ehcontguard`` option now
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emits valid unwind entrypoints which are validated when the context is being
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set during exception handling.
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Changes to the LLVM IR
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----------------------
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* The ``inalloca`` attribute now has a mandatory type field, similar
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to ``byval`` and ``sret``.
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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 the ARM Backend
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--------------------------
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During this release ...
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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 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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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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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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* FastISel no longer tracks killed registers, and instead leaves this to the
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register allocator. This means that ``hasTrivialKill()`` is removed, as well
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as the ``OpNIsKill`` parameters to the ``fastEmit_*()`` family of functions.
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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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* The options ``--build-id-link-{dir,input,output}`` have been deleted.
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(`D96310 <https://reviews.llvm.org/D96310>`_)
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* Support for in-order processors has been added to ``llvm-mca``.
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(`D94928 <https://reviews.llvm.org/D94928>`_)
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Changes to LLDB
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---------------------------------
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Changes to Sanitizers
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---------------------
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External Open Source Projects Using LLVM 13
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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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