--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.amd64/src/org/graalvm/compiler/hotspot/amd64/AMD64HotSpotReturnOp.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2012, 2016, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.compiler.hotspot.amd64;
+
+import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.ILLEGAL;
+import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
+
+import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
+import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig;
+import org.graalvm.compiler.lir.LIRInstructionClass;
+import org.graalvm.compiler.lir.Opcode;
+import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
+import org.graalvm.compiler.lir.gen.DiagnosticLIRGeneratorTool.ZapStackArgumentSpaceBeforeInstruction;
+
+import jdk.vm.ci.amd64.AMD64.CPUFeature;
+import jdk.vm.ci.code.Register;
+import jdk.vm.ci.meta.Value;
+
+/**
+ * Returns from a function.
+ */
+@Opcode("RETURN")
+final class AMD64HotSpotReturnOp extends AMD64HotSpotEpilogueBlockEndOp implements ZapStackArgumentSpaceBeforeInstruction {
+
+    public static final LIRInstructionClass<AMD64HotSpotReturnOp> TYPE = LIRInstructionClass.create(AMD64HotSpotReturnOp.class);
+    @Use({REG, ILLEGAL}) protected Value value;
+    private final boolean isStub;
+    private final Register scratchForSafepointOnReturn;
+    private final GraalHotSpotVMConfig config;
+
+    AMD64HotSpotReturnOp(Value value, boolean isStub, Register scratchForSafepointOnReturn, GraalHotSpotVMConfig config) {
+        super(TYPE);
+        this.value = value;
+        this.isStub = isStub;
+        this.scratchForSafepointOnReturn = scratchForSafepointOnReturn;
+        this.config = config;
+    }
+
+    @Override
+    public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
+        leaveFrameAndRestoreRbp(crb, masm);
+        if (!isStub) {
+            // Every non-stub compile method must have a poll before the return.
+            AMD64HotSpotSafepointOp.emitCode(crb, masm, config, true, null, scratchForSafepointOnReturn);
+
+            /*
+             * We potentially return to the interpreter, and that's an AVX-SSE transition. The only
+             * live value at this point should be the return value in either rax, or in xmm0 with
+             * the upper half of the register unused, so we don't destroy any value here.
+             */
+            if (masm.supports(CPUFeature.AVX)) {
+                masm.vzeroupper();
+            }
+        }
+        masm.ret(0);
+    }
+}