[InterleavedAccess] Add a pass InterleavedAccess to identify interleaved memory accesses and transform into target specific intrinsics.

E.g. An interleaved load (Factor = 2):
        %wide.vec = load <8 x i32>, <8 x i32>* %ptr
        %v0 = shuffle <8 x i32> %wide.vec, <8 x i32> undef, <0, 2, 4, 6>
        %v1 = shuffle <8 x i32> %wide.vec, <8 x i32> undef, <1, 3, 5, 7>
It can be transformed into a ld2 intrinsic in AArch64 backend or a vld2 intrinsic in ARM backend.

E.g. An interleaved store (Factor = 3):
        %i.vec = shuffle <8 x i32> %v0, <8 x i32> %v1, <0, 4, 8, 1, 5, 9, 2, 6, 10, 3, 7, 11>
        store <12 x i32> %i.vec, <12 x i32>* %ptr
It can be transformed into a st3 intrinsic in AArch64 backend or a vst3 intrinsic in ARM backend.

Differential Revision: http://reviews.llvm.org/D10533


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240751 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/Passes.h

@@ -637,6 +637,11 @@ namespace llvm {
   /// createForwardControlFlowIntegrityPass - This pass adds control-flow
   /// integrity.
   ModulePass *createForwardControlFlowIntegrityPass();
+
+  /// InterleavedAccess Pass - This pass identifies and matches interleaved
+  /// memory accesses to target specific intrinsics.
+  ///
+  FunctionPass *createInterleavedAccessPass(const TargetMachine *TM);
 } // End llvm namespace
 
 /// Target machine pass initializer for passes with dependencies. Use with