[llvm] [LoopVectorize] Add cost of generating tail-folding mask to the loop (PR #130565)

[Paul Walker via llvm-commits]

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@@ -743,6 +743,21 @@ InstructionCost VPInstruction::computeCost(ElementCount VF,
     return Ctx.TTI.getArithmeticReductionCost(
         Instruction::Or, cast<VectorType>(VecTy), std::nullopt, Ctx.CostKind);
   }
+  case VPInstruction::ActiveLaneMask: {
+    Type *Arg0Ty = Ctx.Types.inferScalarType(getOperand(0));
+    Type *Arg1Ty = Ctx.Types.inferScalarType(getOperand(1));
+    Type *RetTy = toVectorTy(Ctx.Types.inferScalarType(this), VF);
+    IntrinsicCostAttributes Attrs(Intrinsic::get_active_lane_mask, RetTy,
+                                  {Arg0Ty, Arg1Ty});
+    return Ctx.TTI.getIntrinsicInstrCost(Attrs, Ctx.CostKind);
+  }
+  case VPInstruction::ExplicitVectorLength: {
+    Type *I32Ty = Type::getInt32Ty(Ctx.LLVMCtx);
+    Type *I1Ty = Type::getInt1Ty(Ctx.LLVMCtx);
+    IntrinsicCostAttributes Attrs(Intrinsic::experimental_get_vector_length,
+                                  I32Ty, {I32Ty, I1Ty});
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paulwalker-arm wrote:

This should be `{I32Ty, I32Ty , I1Ty}` to match the intrinsic definition?

https://github.com/llvm/llvm-project/pull/130565