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LLVM 4.0.0 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 4.0.0 release. You may
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prefer the `LLVM 3.9 Release Notes <http://llvm.org/releases/3.9.0/docs
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/ReleaseNotes.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 4.0.0. 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 <http://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 <http://llvm.org/>`_. If you
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have questions or comments, the `LLVM Developer's Mailing List
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<http://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 Subversion 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 <http://llvm.org/releases/>`_.
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Non-comprehensive list of changes in this release
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=================================================
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* The C API functions LLVMAddFunctionAttr, LLVMGetFunctionAttr,
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LLVMRemoveFunctionAttr, LLVMAddAttribute, LLVMRemoveAttribute,
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LLVMGetAttribute, LLVMAddInstrAttribute and
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LLVMRemoveInstrAttribute have been removed.
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* The C API enum LLVMAttribute has been deleted.
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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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* The definition and uses of LLVM_ATRIBUTE_UNUSED_RESULT in the LLVM source
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were replaced with LLVM_NODISCARD, which matches the C++17 [[nodiscard]]
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semantics rather than gcc's __attribute__((warn_unused_result)).
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* Minimum compiler version to build has been raised to GCC 4.8 and VS 2015.
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* ... next change ...
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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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Changes to the LLVM IR
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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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* The entire backend has been merged in-tree with all tests passing. All of
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the instruction selection code and the machine code backend has landed
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recently and is fully usable.
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Changes to the OCaml bindings
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-----------------------------
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* The attribute API was completely overhauled, following the changes
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to the C API.
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External Open Source Projects Using LLVM 4.0.0
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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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<http://llvm.org/>`_, in particular in the `documentation
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<http://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 Subversion 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 <http://llvm.org/docs/#maillist>`_.
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