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
..
AArch64	[ARM64] Set default CPU to generic instead of cyclone.	2014-04-15 19:08:46 +00:00
ARM	Fix a bug in which BranchProbabilityInfo wasn't setting branch weights of basic blocks inside loops correctly.	2014-04-14 16:56:19 +00:00
ARM64	[ARM64] Set default CPU to generic instead of cyclone.	2014-04-15 19:08:46 +00:00
CPP
Generic	CommandLine: Exit successfully for -version and -help	2014-02-28 19:08:01 +00:00
Hexagon	Fix broken CHECK lines	2014-02-16 07:31:05 +00:00
Inputs
Mips	[mips] Fix fcopysign for MIPS-IV and add the test.	2014-04-14 16:24:12 +00:00
MSP430	Mark FPB as a reserved register when needed.	2014-04-02 13:13:56 +00:00
NVPTX	[NVPTX] Add preliminary intrinsics and codegen support for textures/surfaces	2014-04-09 15:39:15 +00:00
PowerPC	[PowerPC] Fix rlwimi isel when mask is not constant	2014-04-13 17:10:58 +00:00
R600	SelectionDAG: Use helper function to improve legalization of ISD::MUL	2014-04-11 16:12:01 +00:00
SPARC	Remove the linker_private and linker_private_weak linkages.	2014-03-13 23:18:37 +00:00
SystemZ	Reenable use of TBAA during CodeGen	2014-04-12 01:26:00 +00:00
Thumb	Move the segmented stack switch to a function attribute	2014-04-10 22:58:43 +00:00
Thumb2	Move the segmented stack switch to a function attribute	2014-04-10 22:58:43 +00:00
X86	[X86] Improve the lowering of packed shifts by constant build_vector.	2014-04-15 19:30:48 +00:00
XCore	[XCore] Don't create invalid MKMSK instructions inside loadImmediate().	2014-04-14 12:30:35 +00:00