--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.aarch64/src/org/graalvm/compiler/core/aarch64/AArch64LIRGenerator.java	Tue Sep 24 08:54:08 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.aarch64/src/org/graalvm/compiler/core/aarch64/AArch64LIRGenerator.java	Tue Sep 24 12:47:15 2019 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -66,6 +66,7 @@
 import org.graalvm.compiler.lir.aarch64.AArch64Move.MembarOp;
 import org.graalvm.compiler.lir.aarch64.AArch64PauseOp;
 import org.graalvm.compiler.lir.aarch64.AArch64SpeculativeBarrier;
+import org.graalvm.compiler.lir.aarch64.AArch64ZeroMemoryOp;
 import org.graalvm.compiler.lir.gen.LIRGenerationResult;
 import org.graalvm.compiler.lir.gen.LIRGenerator;
 import org.graalvm.compiler.phases.util.Providers;
@@ -530,7 +531,7 @@
     }
 
     @Override
-    public Variable emitArrayEquals(JavaKind kind, Value array1, Value array2, Value length, int constantLength, boolean directPointers) {
+    public Variable emitArrayEquals(JavaKind kind, Value array1, Value array2, Value length, boolean directPointers) {
         Variable result = newVariable(LIRKind.value(AArch64Kind.DWORD));
         append(new AArch64ArrayEqualsOp(this, kind, result, array1, array2, asAllocatable(length), directPointers));
         return result;
@@ -583,4 +584,10 @@
     public void emitSpeculationFence() {
         append(new AArch64SpeculativeBarrier());
     }
+
+    @Override
+    public void emitZeroMemory(Value address, Value length) {
+        // Value address is 8-byte aligned; Value length is multiple of 8.
+        append(new AArch64ZeroMemoryOp(asAllocatable(address), asAllocatable(length), false, -1));
+    }
 }