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e54158504f
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Andrea Di Biagio e54158504f [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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203156 91177308-0d34-0410-b5e6-96231b3b80d8
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
.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
configure Add patch level to llvm version in CMake and Autoconf 2014-03-03 15:22:00 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile Provide CMake package modules in install tree 2014-02-09 16:37:02 +00:00
Makefile.common
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

README.txt 

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