Index: lib/Target/AArch64/AArch64TargetTransformInfo.cpp
===================================================================
--- lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -45,6 +45,9 @@
   if (Val == 0 || AArch64_AM::isLogicalImmediate(Val, 64))
     return 0;
 
+  if (AArch64_AM::isAnyMOVWMovAlias(Val, 64))
+    return 1;
+
   if (Val < 0)
     Val = ~Val;
 
@@ -74,8 +77,7 @@
     int64_t Val = Tmp.getSExtValue();
     Cost += getIntImmCost(Val);
   }
-  // We need at least one instruction to materialze the constant.
-  return std::max(1, Cost);
+  return Cost;
 }
 
 int AArch64TTIImpl::getIntImmCost(unsigned Opcode, unsigned Idx,