mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-22 18:54:02 +01:00
207 lines
6.8 KiB
ReStructuredText
207 lines
6.8 KiB
ReStructuredText
=========================
|
|
LLVM 12.0.0 Release Notes
|
|
=========================
|
|
|
|
.. contents::
|
|
:local:
|
|
|
|
.. warning::
|
|
These are in-progress notes for the upcoming LLVM 12 release.
|
|
Release notes for previous releases can be found on
|
|
`the Download Page <https://releases.llvm.org/download.html>`_.
|
|
|
|
|
|
Introduction
|
|
============
|
|
|
|
This document contains the release notes for the LLVM Compiler Infrastructure,
|
|
release 12.0.0. Here we describe the status of LLVM, including major improvements
|
|
from the previous release, improvements in various subprojects of LLVM, and
|
|
some of the current users of the code. All LLVM releases may be downloaded
|
|
from the `LLVM releases web site <https://llvm.org/releases/>`_.
|
|
|
|
For more information about LLVM, including information about the latest
|
|
release, please check out the `main LLVM web site <https://llvm.org/>`_. If you
|
|
have questions or comments, the `LLVM Developer's Mailing List
|
|
<https://lists.llvm.org/mailman/listinfo/llvm-dev>`_ is a good place to send
|
|
them.
|
|
|
|
Note that if you are reading this file from a Git checkout or the main
|
|
LLVM web page, this document applies to the *next* release, not the current
|
|
one. To see the release notes for a specific release, please see the `releases
|
|
page <https://llvm.org/releases/>`_.
|
|
|
|
Non-comprehensive list of changes in this release
|
|
=================================================
|
|
.. NOTE
|
|
For small 1-3 sentence descriptions, just add an entry at the end of
|
|
this list. If your description won't fit comfortably in one bullet
|
|
point (e.g. maybe you would like to give an example of the
|
|
functionality, or simply have a lot to talk about), see the `NOTE` below
|
|
for adding a new subsection.
|
|
|
|
* The ConstantPropagation pass was removed. Users should use the InstSimplify
|
|
pass instead.
|
|
|
|
|
|
.. NOTE
|
|
If you would like to document a larger change, then you can add a
|
|
subsection about it right here. You can copy the following boilerplate
|
|
and un-indent it (the indentation causes it to be inside this comment).
|
|
|
|
Special New Feature
|
|
-------------------
|
|
|
|
Makes programs 10x faster by doing Special New Thing.
|
|
|
|
|
|
Changes to the LLVM IR
|
|
----------------------
|
|
|
|
* ...
|
|
|
|
* Added the ``byref`` attribute to better represent argument passing
|
|
for the `amdgpu_kernel` calling convention.
|
|
|
|
* Added type parameter to the ``sret`` attribute to continue work on
|
|
removing pointer element types.
|
|
|
|
* The ``llvm.experimental.vector.reduce`` family of intrinsics have been renamed
|
|
to drop the "experimental" from the name, reflecting their now fully supported
|
|
status in the IR.
|
|
|
|
|
|
Changes to building LLVM
|
|
------------------------
|
|
|
|
* The internal ``llvm-build`` Python script and the associated ``LLVMBuild.txt``
|
|
files used to describe the LLVM component structure have been removed and
|
|
replaced by a pure ``CMake`` approach, where each component stores extra
|
|
properties in the created targets. These properties are processed once all
|
|
components are defined to resolve library dependencies and produce the header
|
|
expected by llvm-config.
|
|
|
|
Changes to TableGen
|
|
-------------------
|
|
|
|
* The new "TableGen Programmer's Reference" replaces the "TableGen Language
|
|
Introduction" and "TableGen Language Reference" documents.
|
|
|
|
* The syntax for specifying an integer range in a range list has changed.
|
|
The old syntax used a hyphen in the range (e.g., ``{0-9}``). The new syntax
|
|
uses the "`...`" range punctuation (e.g., ``{0...9}``). The hyphen syntax
|
|
is deprecated.
|
|
|
|
Changes to the ARM Backend
|
|
--------------------------
|
|
|
|
During this release ...
|
|
|
|
Changes to the MIPS Target
|
|
--------------------------
|
|
|
|
During this release ...
|
|
|
|
|
|
Changes to the PowerPC Target
|
|
-----------------------------
|
|
|
|
During this release ...
|
|
|
|
Changes to the X86 Target
|
|
-------------------------
|
|
|
|
During this release ...
|
|
|
|
* The 'mpx' feature was removed from the backend. It had been removed from clang
|
|
frontend in 10.0. Mention of the 'mpx' feature in an IR file will print a
|
|
message to stderr, but IR should still compile.
|
|
* Support for ``-march=alderlake``, ``-march=sapphirerapids``,
|
|
``-march=znver3`` and ``-march=x86-64-v[234]`` has been added.
|
|
* The assembler now has support for {disp32} and {disp8} pseudo prefixes for
|
|
controlling displacement size for memory operands and jump displacements. The
|
|
assembler also supports the .d32 and .d8 mnemonic suffixes to do the same.
|
|
* A new function attribute "tune-cpu" has been added to support -mtune like gcc.
|
|
This allows microarchitectural optimizations to be applied independent from
|
|
the "target-cpu" attribute or TargetMachine CPU which will be used to select
|
|
Instruction Set. If the attribute is not present, the tune CPU will follow
|
|
the target CPU.
|
|
* Support for ``HRESET`` instructions has been added.
|
|
* Support for ``UINTR`` instructions has been added.
|
|
* Support for ``AVXVNNI`` instructions has been added.
|
|
|
|
Changes to the AMDGPU Target
|
|
-----------------------------
|
|
|
|
During this release ...
|
|
|
|
* The new ``byref`` attribute is now the preferred method for
|
|
representing aggregate kernel arguments.
|
|
|
|
Changes to the AVR Target
|
|
-----------------------------
|
|
|
|
During this release ...
|
|
|
|
Changes to the WebAssembly Target
|
|
---------------------------------
|
|
|
|
During this release ...
|
|
|
|
Changes to the OCaml bindings
|
|
-----------------------------
|
|
|
|
|
|
Changes to the C API
|
|
--------------------
|
|
|
|
|
|
Changes to the Go bindings
|
|
--------------------------
|
|
|
|
|
|
Changes to the DAG infrastructure
|
|
---------------------------------
|
|
|
|
|
|
Changes to the Debug Info
|
|
---------------------------------
|
|
|
|
During this release ...
|
|
|
|
Changes to the LLVM tools
|
|
---------------------------------
|
|
|
|
* llvm-readobj and llvm-readelf behavior has changed to report an error when
|
|
executed with no input files instead of reading an input from stdin.
|
|
Reading from stdin can still be achieved by specifying `-` as an input file.
|
|
|
|
Changes to LLDB
|
|
---------------------------------
|
|
|
|
Changes to Sanitizers
|
|
---------------------
|
|
|
|
The integer sanitizer `-fsanitize=integer` now has a new sanitizer:
|
|
`-fsanitize=unsigned-shift-base`. It's not undefined behavior for an unsigned
|
|
left shift to overflow (i.e. to shift bits out), but it has been the source of
|
|
bugs and exploits in certain codebases in the past.
|
|
|
|
External Open Source Projects Using LLVM 12
|
|
===========================================
|
|
|
|
* A project...
|
|
|
|
Additional Information
|
|
======================
|
|
|
|
A wide variety of additional information is available on the `LLVM web page
|
|
<https://llvm.org/>`_, in particular in the `documentation
|
|
<https://llvm.org/docs/>`_ section. The web page also contains versions of the
|
|
API documentation which is up-to-date with the Git version of the source
|
|
code. You can access versions of these documents specific to this release by
|
|
going into the ``llvm/docs/`` directory in the LLVM tree.
|
|
|
|
If you have any questions or comments about LLVM, please feel free to contact
|
|
us via the `mailing lists <https://llvm.org/docs/#mailing-lists>`_.
|