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
..
Analysis	Teach lint about address spaces	2014-03-06 17:33:55 +00:00
AsmParser	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
Bitcode	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
CodeGen	[X86] Teach the DAGCombiner how to fold a OR of two shufflevector nodes.	2014-03-06 20:19:52 +00:00
DebugInfo	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
ExecutionEngine	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
IR	Teach lint about address spaces	2014-03-06 17:33:55 +00:00
IRReader	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
LTO	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
LineEditor	[CMake] Use LINK_LIBS instead of target_link_libraries().	2014-02-26 06:41:29 +00:00
Linker	[Layering] Sink Linker.h into a Linker subdirectory to make it	2014-03-06 03:42:23 +00:00
MC	MS asm: The initial dot in struct access is optional	2014-03-06 19:19:12 +00:00
Object	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
Option	Avoid buffer copies when a Twine already is a StringRef.	2013-12-03 18:18:28 +00:00
Support	Revert create_symbolic_link and both depending changes	2014-03-06 19:07:35 +00:00
TableGen	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
Target	MS asm: The initial dot in struct access is optional	2014-03-06 19:19:12 +00:00
Transforms	Replace OwningPtr<T> with std::unique_ptr<T>.	2014-03-06 05:51:42 +00:00
CMakeLists.txt	Introduce line editor library.	2014-01-31 23:46:14 +00:00
LLVMBuild.txt	Introduce line editor library.	2014-01-31 23:46:14 +00:00
Makefile	Introduce line editor library.	2014-01-31 23:46:14 +00:00