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diff --git a/src/3rdparty/v8/test/mjsunit/compiler/simple-deopt.js b/src/3rdparty/v8/test/mjsunit/compiler/simple-deopt.js
new file mode 100644
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+++ b/src/3rdparty/v8/test/mjsunit/compiler/simple-deopt.js
@@ -0,0 +1,107 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax
+
+function f(x) {
+  return ~x;
+}
+
+f(42);
+assertEquals(~12, f(12.45));
+assertEquals(~42, f(42.87));
+
+
+var a = 1, b = 2, c = 4, d = 8;
+function g() {
+  return a | (b | (c | d));
+}
+
+g();
+c = "16";
+assertEquals(1 | 2 | 16 | 8, g());
+
+
+// Test deopt when global function changes.
+function h() {
+  return g();
+}
+assertEquals(1 | 2 | 16 | 8, h());
+g = function() { return 42; };
+assertEquals(42, h());
+
+
+// Test deopt when map changes.
+var obj = {};
+obj.g = g;
+function k(o) {
+  return o.g();
+}
+for (var i = 0; i < 5; i++) k(obj);
+%OptimizeFunctionOnNextCall(k);
+k(obj);
+assertEquals(42, k(obj));
+assertEquals(87, k({g: function() { return 87; }}));
+
+
+// Test deopt with assignments to parameters.
+function p(x,y) {
+  x = 42;
+  y = 1;
+  y = y << "0";
+  return x | y;
+}
+assertEquals(43, p(0,0));
+
+
+// Test deopt with literals on the expression stack.
+function LiteralToStack(x) {
+  return 'lit[' + (x + ']');
+}
+
+assertEquals('lit[-87]', LiteralToStack(-87));
+assertEquals('lit[0]', LiteralToStack(0));
+assertEquals('lit[42]', LiteralToStack(42));
+
+
+// Test deopt before call.
+var str = "abc";
+var r;
+function CallCharAt(n) { return str.charAt(n); }
+for (var i = 0; i < 5; i++) {
+  r = CallCharAt(0);
+}
+%OptimizeFunctionOnNextCall(CallCharAt);
+r = CallCharAt(0);
+assertEquals("a", r);
+
+
+// Test of deopt in presence of spilling.
+function add4(a,b,c,d) {
+  return a+b+c+d;
+}
+assertEquals(0x40000003, add4(1,1,2,0x3fffffff));