easy-to-write reStructuredText. See `llvm/docs/README.txt` for more
information.
- Loop Vectorizer
- ---------------
- We've continued the work on the loop vectorizer. The loop vectorizer now has the following features:
- # Loops with unknown trip count.
- # Runtime checks of pointers
- # Reductions, Inductions
- # If Conversion
- # Pointer induction variables
- # Reverse iterators
- # Vectorization of mixed types
- # Vectorization of function calls
- # Partial unrolling during vectorization
-
- We've also improved the X86 and ARM cost model.
-
- TargetTransformInfo
- -------------------
- TargetTransformInto (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.
+* 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 ...
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 count.
+- Runtime checks of pointers
+- Reductions, Inductions
+- 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.
+
+
+
Additional Information
======================