[llvm] [SLP][TTI]Add support for strided loads. (PR #80310)

[Alexey Bataev via llvm-commits]

================
@@ -687,6 +691,15 @@ class TargetTransformInfoImplBase {
     return 1;
   }
 
+  InstructionCost getStridedMemoryOpCost(unsigned Opcode, Type *DataTy,
+                                         const Value *Ptr, bool VariableMask,
+                                         Align Alignment,
+                                         TTI::TargetCostKind CostKind,
+                                         const Instruction *I = nullptr) const {
+    return CostKind == TTI::TCK_RecipThroughput ? TTI::TCC_Expensive
----------------
alexey-bataev wrote:

I thought about this. Unfortunately, TTI tends to fallback to the default TTI functions in many cases and just returns 1 in many cases for all kinds of costs. If it is ok to override this default behavior here, I will do it.

https://github.com/llvm/llvm-project/pull/80310