Andrea Di Biagio 749e8fee34 [X86] Improve the lowering of packed shifts by constant build_vector. ... This patch teaches the backend how to efficiently lower logical and arithmetic packed shifts on both SSE and AVX/AVX2 machines. When possible, instead of scalarizing a vector shift, the backend should try to expand the shift into a sequence of two packed shifts by immedate count followed by a MOVSS/MOVSD. Example (v4i32 (srl A, (build_vector < X, Y, Y, Y>))) Can be rewritten as: (v4i32 (MOVSS (srl A, <Y,Y,Y,Y>), (srl A, <X,X,X,X>))) [with X and Y ConstantInt] The advantage is that the two new shifts from the example would be lowered into X86ISD::VSRLI nodes. This is always cheaper than scalarizing the vector into four scalar shifts plus four pairs of vector insert/extract. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206316 91177308-0d34-0410-b5e6-96231b3b80d8		2014-04-15 19:30:48 +00:00
..
Analysis	Use unique_ptr to manage ownership of child Regions within llvm::Region	2014-04-15 18:32:43 +00:00
AsmParser	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
Bitcode	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
CodeGen	Revert r191049/r191059 as it can produce wrong code (see PR17975).	2014-04-15 18:34:24 +00:00
DebugInfo	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
ExecutionEngine	[Allocator] Finally, finish nuking the redundant code that led me here	2014-04-15 09:44:09 +00:00
IR	verify-di: Add back braces for MSVC compatability	2014-04-15 17:28:26 +00:00
IRReader	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
LineEditor
Linker	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
LTO	verify-di: Implement DebugInfoVerifier	2014-04-15 16:27:38 +00:00
MC	Use unique_ptr for section/segment ownership in WinCOFFObjectWriter	2014-04-15 05:25:03 +00:00
Object	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
Option	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
ProfileData	InstrProf: Silence spurious warnings in GCC 4.8	2014-03-24 00:47:18 +00:00
Support	[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.	2014-04-15 06:32:26 +00:00
TableGen	[C++11] Make use of 'nullptr' in TableGen library.	2014-04-09 04:50:04 +00:00
Target	[X86] Improve the lowering of packed shifts by constant build_vector.	2014-04-15 19:30:48 +00:00
Transforms	Add lifetime markers for allocas created to hold byval arguments, make them	2014-04-15 18:06:46 +00:00
CMakeLists.txt	ProfileData: Introduce the InstrProfReader interface and a text reader	2014-03-21 17:24:48 +00:00
LLVMBuild.txt	ProfileData: Introduce the InstrProfReader interface and a text reader	2014-03-21 17:24:48 +00:00
Makefile	ProfileData: Introduce the InstrProfReader interface and a text reader	2014-03-21 17:24:48 +00:00