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=========================
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LLVM 12.0.0 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 12 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 12.0.0. 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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* The ConstantPropagation pass was removed. Users should use the InstSimplify
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pass instead.
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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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* ...
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* Added the ``byref`` attribute to better represent argument passing
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for the `amdgpu_kernel` calling convention.
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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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* The syntax for specifying an integer range in a range list has changed.
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The old syntax used a hyphen in the range (e.g., ``{0-9}``). The new syntax
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uses the "`...`" range punctuator (e.g., ``{0...9}``). The hyphen syntax
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is deprecated. The "TableGen Language Reference" document has been updated.
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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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* The 'mpx' feature was removed from the backend. It had been removed from clang
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frontend in 10.0. Mention of the 'mpx' feature in an IR file will print a
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message to stderr, but IR should still compile.
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* Support for -march=sapphirerapids was added.
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* The assembler now has support for {disp32} and {disp8} pseudo prefixes for
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controlling displacement size for memory operands and jump displacements. The
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assembler also supports the .d32 and .d8 mnemonic suffixes to do the same.
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* A new function attribute "tune-cpu" has been added to support -mtune like gcc.
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This allows microarchitectural optimizations to be applied independent from
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the "target-cpu" attribute or TargetMachine CPU which will be used to select
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Instruction Set. If the attribute is not present, the tune CPU will follow
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the target CPU.
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Changes to the AMDGPU Target
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-----------------------------
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During this release ...
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* The new ``byref`` attribute is now the preferred method for
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representing aggregate kernel arguments.
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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 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-readobj and llvm-readelf behavior has changed to report an error when
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executed with no input files instead of reading an input from stdin.
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Reading from stdin can still be achieved by specifying `-` as an input file.
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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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The integer sanitizer `-fsanitize=integer` now has a new sanitizer:
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`-fsanitize=unsigned-shift-base`. It's not undefined behavior for an unsigned
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left shift to overflow (i.e. to shift bits out), but it has been the source of
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bugs and exploits in certain codebases in the past.
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External Open Source Projects Using LLVM 12
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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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