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Andrea Di Biagio 6292a140ee [X86] Teach the DAGCombiner how to fold a OR of two shufflevector nodes. 
This patch teaches the DAGCombiner how to fold a binary OR between two
shufflevector into a single shuffle vector when possible.

The rules are:
  1. fold (or (shuf A, V_0, MA), (shuf B, V_0, MB)) -> (shuf A, B, Mask1)
  2. fold (or (shuf A, V_0, MA), (shuf B, V_0, MB)) -> (shuf B, A, Mask2)

The DAGCombiner can take advantage of the fact that OR is commutative and
compute two possible shuffle masks (Mask1 and Mask2) for the resulting
shuffle node.

Before folding a dag according to either rule 1 or 2, DAGCombiner verifies
that the resulting shuffle mask is legal for the target.
DAGCombiner would firstly try to fold according to 1.; If not possible
then it will try to fold according to 2.
If both Mask1 and Mask2 are illegal then we conservatively don't fold
the OR instruction.

llvm-svn: 203156
 		2014-03-06 20:19:52 +00:00
..
autoconf Now that we don't use libtool, we don't need to upgrade it :-) 2014-03-05 22:45:14 +00:00
bindings [python-bindings] Remove some cruft that snuck in. 2014-02-23 04:43:26 +00:00
cmake [CMake] add_llvm_target(): No need to include TABLEGEN_OUTPUT in source list. 2014-03-04 17:05:28 +00:00
docs [LangRef] Improve llvm.mem.parallel_loop_access example 2014-03-05 13:36:04 +00:00
examples Fix warnings about an variable only used in asserts. 2014-03-06 06:35:46 +00:00
include Revert create_symbolic_link and both depending changes 2014-03-06 19:07:35 +00:00
lib [X86] Teach the DAGCombiner how to fold a OR of two shufflevector nodes. 2014-03-06 20:19:52 +00:00
projects Drop libtool from llvm. 2014-02-28 18:17:54 +00:00
test [X86] Teach the DAGCombiner how to fold a OR of two shufflevector nodes. 2014-03-06 20:19:52 +00:00
tools Fix warning about mismatched signs in comparison. 2014-03-06 20:16:24 +00:00
unittests Replace OwningPtr<T> with std::unique_ptr<T>. 2014-03-06 05:51:42 +00:00
utils AVX-512: Added rrk, rrkz, rmk, rmkz, rmbk, rmbkz versions of AVX512 FP packed instructions, added encoding tests for them. 2014-03-06 08:45:30 +00:00
.arcconfig
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.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.gitignore Added .DS_Store entry in .gitignore for ignoring .DS_Store files in the source 2014-01-25 15:15:16 +00:00
CMakeLists.txt Cleaning up a bunch of pre-Visual C++ 2012 build hacks. 2014-03-04 09:23:33 +00:00
CODE_OWNERS.TXT Add myself as owner for libc++ 2014-02-18 14:03:17 +00:00
CREDITS.TXT Fix documentation typos 2013-12-20 00:33:39 +00:00
LICENSE.TXT Update the copyright credits -- Happy new year 2014! 2014-01-01 08:27:31 +00:00
LLVMBuild.txt
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Makefile Provide CMake package modules in install tree 2014-02-09 16:37:02 +00:00
Makefile.common
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Makefile.config.in Add patch level to llvm version in CMake and Autoconf 2014-03-03 15:22:00 +00:00
Makefile.rules Add patch level to llvm version in CMake and Autoconf 2014-03-03 15:22:00 +00:00
README.txt
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configure Add patch level to llvm version in CMake and Autoconf 2014-03-03 15:22:00 +00:00
llvm.spec.in
…

README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.