--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/AMD64ArrayIndexOfOp.java	Thu Nov 14 11:16:14 2019 -0800
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/AMD64ArrayIndexOfOp.java	Thu Nov 14 12:21:00 2019 -0800
@@ -644,4 +644,9 @@
     private static boolean supports(LIRGeneratorTool tool, CPUFeature cpuFeature) {
         return ((AMD64) tool.target().arch).getFeatures().contains(cpuFeature);
     }
+
+    @Override
+    public boolean needsClearUpperVectorRegisters() {
+        return true;
+    }
 }