diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -1602,7 +1602,9 @@
 
   static const TypeConversionCostTblEntry
   ConversionTbl[] = {
-    { ISD::TRUNCATE, MVT::v4i16, MVT::v4i32,  1 },
+    { ISD::TRUNCATE, MVT::v4i16, MVT::v4i32,  1 }, // xtn
+    { ISD::TRUNCATE, MVT::v8i8,  MVT::v8i16,  1},  // xtn
+    { ISD::TRUNCATE, MVT::v2i32,  MVT::v2i64,  1},  // xtn
     { ISD::TRUNCATE, MVT::v4i32, MVT::v4i64,  0 },
     { ISD::TRUNCATE, MVT::v8i8,  MVT::v8i32,  3 },
     { ISD::TRUNCATE, MVT::v16i8, MVT::v16i32, 6 },