======================
-LLVM 3.3 Release Notes
+LLVM 3.8 Release Notes
======================
.. contents::
:local:
.. warning::
- These are in-progress notes for the upcoming LLVM 3.3 release. You may
- prefer the `LLVM 3.2 Release Notes <http://llvm.org/releases/3.2/docs
+ These are in-progress notes for the upcoming LLVM 3.8 release. You may
+ prefer the `LLVM 3.7 Release Notes <http://llvm.org/releases/3.7.0/docs
/ReleaseNotes.html>`_.
============
This document contains the release notes for the LLVM Compiler Infrastructure,
-release 3.3. Here we describe the status of LLVM, including major improvements
+release 3.8. 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 <http://llvm.org/releases/>`_.
For more information about LLVM, including information about the latest
release, please check out the `main LLVM web site <http://llvm.org/>`_. If you
have questions or comments, the `LLVM Developer's Mailing List
-<http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev>`_ is a good place to send
+<http://lists.llvm.org/mailman/listinfo/llvm-dev>`_ is a good place to send
them.
Note that if you are reading this file from a Subversion checkout or the main
Non-comprehensive list of changes in this release
=================================================
+* With this release, the minimum Windows version required for running LLVM is
+ Windows 7. Earlier versions, including Windows Vista and XP are no longer
+ supported.
+
+* With this release, the autoconf build system is deprecated. It will be removed
+ in the 3.9 release. Please migrate to using CMake. For more information see:
+ `Building LLVM with CMake <CMake.html>`_
+
+* The C API function LLVMLinkModules is deprecated. It will be removed in the
+ 3.9 release. Please migrate to LLVMLinkModules2. Unlike the old function the
+ new one
+
+ * Doesn't take an unused parameter.
+ * Destroys the source instead of only damaging it.
+ * Does not record a message. Use the diagnostic handler instead.
+
+* The deprecated C APIs LLVMGetBitcodeModuleProviderInContext and
+ LLVMGetBitcodeModuleProvider have been removed.
.. NOTE
For small 1-3 sentence descriptions, just add an entry at the end of
functionality, or simply have a lot to talk about), see the `NOTE` below
for adding a new subsection.
-* The CellSPU port has been removed. It can still be found in older versions.
-
-* The IR-level extended linker APIs (for example, to link bitcode files out of
- archives) have been removed. Any existing clients of these features should
- move to using a linker with integrated LTO support.
-
-* LLVM and Clang's documentation has been migrated to the `Sphinx
- <http://sphinx-doc.org/>`_ documentation generation system which uses
- easy-to-write reStructuredText. See `llvm/docs/README.txt` for more
- information.
-
-* TargetTransformInfo (TTI) is a new interface that can be used by IR-level
- passes to obtain target-specific information, such as the costs of
- instructions. Only "Lowering" passes such as LSR and the vectorizer are
- allowed to use the TTI infrastructure.
-
-* We've improved the X86 and ARM cost model.
-
-* The Attributes classes have been completely rewritten and expanded. They now
- support not only enumerated attributes and alignments, but "string"
- attributes, which are useful for passing information to code generation. See
- :doc:`HowToUseAttributes` for more details.
-
-* TableGen's syntax for instruction selection patterns has been simplified.
- Instead of specifying types indirectly with register classes, you should now
- specify types directly in the input patterns. See ``SparcInstrInfo.td`` for
- examples of the new syntax. The old syntax using register classes still
- works, but it will be removed in a future LLVM release.
-
-* MCJIT now supports exception handling. Support for it in the old jit will be
- removed in the 3.4 release.
-
-* Command line options can now be grouped into categories which are shown in
- the output of ``-help``. See :ref:`grouping options into categories`.
-
-* The appearance of command line options in ``-help`` that are inherited by
- linking with libraries that use the LLVM Command line support library can now
- be modified at runtime. See :ref:`cl::getRegisteredOptions`.
-
* ... next change ...
.. NOTE
Makes programs 10x faster by doing Special New Thing.
-AArch64 target
---------------
-
-We've added support for AArch64, ARM's 64-bit architecture. Development is still
-in fairly early stages, but we expect successful compilation when:
+Changes to the ARM Backend
+--------------------------
-- compiling standard compliant C99 and C++03 with Clang;
-- using Linux as a target platform;
-- where code + static data doesn't exceed 4GB in size (heap allocated data has
- no limitation).
+ During this release ...
-Some additional functionality is also implemented, notably DWARF debugging,
-GNU-style thread local storage and inline assembly.
-Hexagon Target
---------------
+Changes to the MIPS Target
+--------------------------
-- Removed support for legacy hexagonv2 and hexagonv3 processor
- architectures which are no longer in use. Currently supported
- architectures are hexagonv4 and hexagonv5.
+ During this release ...
-Loop Vectorizer
----------------
-We've continued the work on the loop vectorizer. The loop vectorizer now
-has the following features:
+Changes to the PowerPC Target
+-----------------------------
-- Loops with unknown trip counts.
-- Runtime checks of pointers.
-- Reductions, Inductions.
-- Min/Max reductions of integers.
-- If Conversion.
-- Pointer induction variables.
-- Reverse iterators.
-- Vectorization of mixed types.
-- Vectorization of function calls.
-- Partial unrolling during vectorization.
+ During this release ...
-The loop vectorizer is now enabled by default for -O3.
-SLP Vectorizer
---------------
+Changes to the OCaml bindings
+-----------------------------
-LLVM now has a new SLP vectorizer. The new SLP vectorizer is not enabled by
-default but can be enabled using the clang flag -fslp-vectorize. The BB-vectorizer
-can also be enabled using the command line flag -fslp-vectorize-aggressive.
+ During this release ...
-R600 Backend
-------------
+* The ocaml function link_modules has been replaced with link_modules' which
+ uses LLVMLinkModules2.
-The R600 backend was added in this release, it supports AMD GPUs
-(HD2XXX - HD7XXX). This backend is used in AMD's Open Source
-graphics / compute drivers which are developed as part of the `Mesa3D
-<http://www.mesa3d.org>`_ project.
-SystemZ/s390x Backend
----------------------
-
-LLVM and clang now support IBM's z/Architecture. At present this support
-is restricted to GNU/Linux (GNU triplet s390x-linux-gnu) and requires
-z10 or greater.
-
-
-External Open Source Projects Using LLVM 3.3
+External Open Source Projects Using LLVM 3.8
============================================
An exciting aspect of LLVM is that it is used as an enabling technology for
a lot of other language and tools projects. This section lists some of the
-projects that have already been updated to work with LLVM 3.3.
-
-
-Portable Computing Language (pocl)
-----------------------------------
-
-In addition to producing an easily portable open source OpenCL
-implementation, another major goal of `pocl <http://pocl.sourceforge.net/>`_
-is improving performance portability of OpenCL programs with
-compiler optimizations, reducing the need for target-dependent manual
-optimizations. An important part of pocl is a set of LLVM passes used to
-statically parallelize multiple work-items with the kernel compiler, even in
-the presence of work-group barriers. This enables static parallelization of
-the fine-grained static concurrency in the work groups in multiple ways.
-
-TTA-based Co-design Environment (TCE)
--------------------------------------
-
-`TCE <http://tce.cs.tut.fi/>`_ is a toolset for designing new
-processors based on the Transport triggered architecture (TTA).
-The toolset provides a complete co-design flow from C/C++
-programs down to synthesizable VHDL/Verilog and parallel program binaries.
-Processor customization points include the register files, function units,
-supported operations, and the interconnection network.
-
-TCE uses Clang and LLVM for C/C++/OpenCL C language support, target independent
-optimizations and also for parts of code generation. It generates new
-LLVM-based code generators "on the fly" for the designed TTA processors and
-loads them in to the compiler backend as runtime libraries to avoid
-per-target recompilation of larger parts of the compiler chain.
-
-Just-in-time Adaptive Decoder Engine (Jade)
--------------------------------------------
-
-`Jade <https://github.com/orcc/jade>`_ (Just-in-time Adaptive Decoder Engine)
-is a generic video decoder engine using LLVM for just-in-time compilation of
-video decoder configurations. Those configurations are designed by MPEG
-Reconfigurable Video Coding (RVC) committee. MPEG RVC standard is built on a
-stream-based dataflow representation of decoders. It is composed of a standard
-library of coding tools written in RVC-CAL language and a dataflow
-configuration --- block diagram --- of a decoder.
-
-Jade project is hosted as part of the Open RVC-CAL Compiler
-(`Orcc <http://orcc.sf.net>`_) and requires it to translate the RVC-CAL standard
-library of video coding tools into an LLVM assembly code.
+projects that have already been updated to work with LLVM 3.8.
+
+* A project
+
Additional Information
======================
projects / oota-llvm.git / blobdiff