[llvm] [VPlan] Compute cost of more replicating loads/stores in ::computeCost. (PR #160053)

[Florian Hahn via llvm-commits]

================
@@ -3068,6 +3068,63 @@ bool VPReplicateRecipe::shouldPack() const {
   });
 }
 
+/// Returns true if \p Ptr is a pointer computation for which the legacy cost
+/// model computes a SCEV expression when computing the address cost.
+static bool shouldUseAddressAccessSCEV(VPValue *Ptr) {
+  auto *PtrR = Ptr->getDefiningRecipe();
+  if (!PtrR || !((isa<VPReplicateRecipe>(PtrR) &&
+                  cast<VPReplicateRecipe>(PtrR)->getOpcode() ==
+                      Instruction::GetElementPtr) ||
+                 isa<VPWidenGEPRecipe>(PtrR)))
+    return false;
+
+  // We are looking for a GEP with all loop invariant indices except for one
+  // which should be an induction variable.
----------------
fhahn wrote:

Yep, updated thanks! (original comment was just copied).

https://github.com/llvm/llvm-project/pull/160053