--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/AMD64Move.java	Tue Mar 12 12:12:01 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.amd64/src/org/graalvm/compiler/lir/amd64/AMD64Move.java	Tue Mar 12 19:17:42 2019 +0100
@@ -698,7 +698,7 @@
                     if (crb.mustReplaceWithNullRegister(input)) {
                         masm.movq(result, crb.nullRegister);
                     } else {
-                        masm.movq(result, 0x0L);
+                        masm.movslq(result, 0);
                     }
                 } else if (crb.target.inlineObjects) {
                     crb.recordInlineDataInCode(input);