Index: lib/Target/AArch64/InstPrinter/AArch64InstPrinter.cpp
===================================================================
--- lib/Target/AArch64/InstPrinter/AArch64InstPrinter.cpp
+++ lib/Target/AArch64/InstPrinter/AArch64InstPrinter.cpp
@@ -71,8 +71,12 @@
 
   if (atomicBarrierDroppedOnZero(Opcode) &&
       (MI->getOperand(0).getReg() == AArch64::XZR ||
-       MI->getOperand(0).getReg() == AArch64::WZR))
+       MI->getOperand(0).getReg() == AArch64::WZR)) {
+    if (!printAliasInstr(MI, STI, O))
+          printInstruction(MI, STI, O);
     printAnnotation(O, "acquire semantics dropped since destination is zero");
+    return;
+  }
 
   // SBFM/UBFM should print to a nicer aliased form if possible.
   if (Opcode == AArch64::SBFMXri || Opcode == AArch64::SBFMWri ||