[llvm] [LV] Move check if any vector insts will be generated to VPlan. (PR #96622)

[via llvm-commits]

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@@ -4879,6 +4874,52 @@ static void emitInvalidCostRemarks(SmallVector<InstructionVFPair> InvalidCosts,
   } while (!Tail.empty());
 }
 
+static bool willGenerateVectorInstructions(VPlan &Plan, ElementCount VF,
+                                           const TargetTransformInfo &TTI) {
+  VPTypeAnalysis TypeInfo(Plan.getCanonicalIV()->getScalarType(),
+                          Plan.getCanonicalIV()->getScalarType()->getContext());
+  for (VPBasicBlock *VPBB : VPBlockUtils::blocksOnly<VPBasicBlock>(
+           vp_depth_first_shallow(Plan.getVectorLoopRegion()->getEntry()))) {
+    for (VPRecipeBase &R : *VPBB) {
+      if (isa<VPDerivedIVRecipe, VPScalarIVStepsRecipe, VPScalarCastRecipe,
+              VPReplicateRecipe, VPInstruction, VPActiveLaneMaskPHIRecipe,
+              VPCanonicalIVPHIRecipe, VPEVLBasedIVPHIRecipe,
+              VPVectorPointerRecipe>(&R))
+        continue;
+
+      auto WillWiden = [&TypeInfo, &TTI, VF](VPValue *VPV) {
+        Type *ScalarTy = TypeInfo.inferScalarType(VPV);
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ayalz wrote:

Time to introduce `inferVectorType()`?

https://github.com/llvm/llvm-project/pull/96622