======================
-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.
-.. 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.
+* 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 CellSPU port has been removed. It can still be found in older versions.
+* The C API functions LLVMParseBitcode, LLVMParseBitcodeInContext,
+ LLVMGetBitcodeModuleInContext and LLVMGetBitcodeModule have been deprecated.
+ They will be removed in 3.9. Please migrate to the versions with a 2 suffix.
+ Unlike the old ones the new ones do not record a diagnostic message. Use
+ the diagnostic handler instead.
-* 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.
+* The deprecated C APIs LLVMGetBitcodeModuleProviderInContext and
+ LLVMGetBitcodeModuleProvider have been removed.
-* 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.
+* The deprecated C APIs LLVMCreateExecutionEngine, LLVMCreateInterpreter,
+ LLVMCreateJITCompiler, LLVMAddModuleProvider and LLVMRemoveModuleProvider
+ have been removed.
-* 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.
+* With this release, the C API headers have been reorganized to improve build
+ time. Type specific declarations have been moved to Type.h, and error
+ handling routines have been moved to ErrorHandling.h. Both are included in
+ Core.h so nothing should change for projects directly including the headers,
+ but transitive dependencies may be affected.
-* We've improved the X86 and ARM cost model.
+* llvm-ar now suports thin archives.
-* 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.
+* llvm doesn't produce .data.rel.ro.local or .data.rel sections anymore.
-* 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.
+* aliases to available_externally globals are now rejected by the verifier.
-* MCJIT now supports exception handling. Support for it in the old jit will be
- removed in the 3.4 release.
+* the IR Linker has been split into IRMover that moves bits from one module to
+ another and Linker proper that decides what to link.
+
+* Support for dematerializing has been dropped.
+
+.. 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.
* ... next change ...
Makes programs 10x faster by doing Special New Thing.
-AArch64 target
---------------
+Changes to the ARM Backend
+--------------------------
+
+ During this release ...
-We've added support for AArch64, ARM's 64-bit architecture. Development is still
-in fairly early stages, but we expect successful compilation when:
-- 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).
+Changes to the MIPS Target
+--------------------------
-Some additional functionality is also implemented, notably DWARF debugging,
-GNU-style thread local storage and inline assembly.
+ During this release ...
-Hexagon Target
---------------
-- Removed support for legacy hexagonv2 and hexagonv3 processor
- architectures which are no longer in use. Currently supported
- architectures are hexagonv4 and hexagonv5.
+Changes to the PowerPC Target
+-----------------------------
-Loop Vectorizer
----------------
+ During this release ...
-We've continued the work on the loop vectorizer. The loop vectorizer now
-has the following features:
-- 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.
+Changes to the X86 Target
+-----------------------------
-The loop vectorizer is now enabled by default for -O3.
+ During this release ...
-SLP Vectorizer
---------------
+* TLS is enabled for Cygwin as emutls.
-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.
-R600 Backend
-------------
+Changes to the OCaml bindings
+-----------------------------
-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.
+ During this release ...
+* The ocaml function link_modules has been replaced with link_modules' which
+ uses LLVMLinkModules2.
-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.
+projects that have already been updated to work with LLVM 3.8.
+
+* A project
Additional Information
projects / oota-llvm.git / blobdiff