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.
+
* ... 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:
+
+- 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).
+
+Some additional functionality is also implemented, notably DWARF debugging,
+GNU-style thread local storage and inline assembly.
+
+Hexagon Target
+--------------
+
+- Removed support for legacy hexagonv2 and hexagonv3 processor
+ architectures which are no longer in use. Currently supported
+ architectures are hexagonv4 and hexagonv5.
+
+Loop Vectorizer
+---------------
+
+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.
+
+The loop vectorizer is now enabled by default for -O3.
+
+SLP Vectorizer
+--------------
+
+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
+------------
+
+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.
+
+
+External Open Source Projects Using LLVM 3.3
+============================================
+
+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.
+
+
Additional Information
======================
projects / oota-llvm.git / blobdiff