[PATCH] Masked load/store for types that require legalization.

[Elena Demikhovsky]

Hi nadav, aschwaighofer, mzolotukhin, steven_wu,

In this big patch I'm solving two things. (If you'll say that it is too big and not reviewable, I'll spit into two, but this things are connected)
1. The current lowering of masked load/store for <2 x i32> and <2 x f32> is incorrect, and I'm solving this in type legalizer and subsequent "combine" in X86.
2. I added the cost estimation for masked operations that shows that 
           (1) masked load/store for these vector types are very expensive ( due to expanding loads and truncating stores )
           (2) maskmov operation itself is not as cheap as vector load-store.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D6966

Files:
  include/llvm/Analysis/TargetTransformInfo.h
  include/llvm/CodeGen/SelectionDAG.h
  include/llvm/CodeGen/SelectionDAGNodes.h
  lib/Analysis/TargetTransformInfo.cpp
  lib/CodeGen/BasicTargetTransformInfo.cpp
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  lib/CodeGen/SelectionDAG/LegalizeTypes.h
  lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86TargetTransformInfo.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Analysis/CostModel/X86/masked-intrinsic-cost.ll
  test/CodeGen/X86/masked_memop.ll

EMAIL PREFERENCES
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