diff --git a/test/mjsunit/regress/regress-1246.js b/test/mjsunit/regress/regress-1246.js
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+++ b/test/mjsunit/regress/regress-1246.js
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+// Copyright 2011 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.
+
+// This regression tests the behaviour of the parseInt function when
+// the given radix is not a SMI.
+
+// Flags: --allow-natives-syntax
+
+var nonSmi10 = Math.log(Math.exp(10));
+var nonSmi16 = Math.log(Math.exp(16));
+
+assertTrue(!%_IsSmi(nonSmi10) && nonSmi10 == 10);
+assertTrue(!%_IsSmi(nonSmi16) && nonSmi16 == 16);
+
+// Giving these values as the radix argument triggers radix detection.
+var radix_detect = [0, -0, NaN, Infinity, -Infinity, undefined, null,
+                    "0", "-0", "a"];
+
+// These values will result in an integer radix outside of the valid range.
+var radix_invalid = [1, 37, -2, "-2", "37"];
+
+// These values will trigger decimal parsing.
+var radix10 = [10, 10.1, "10", "10.1", nonSmi10];
+
+// These values will trigger hexadecimal parsing.
+var radix16 = [16, 16.1, 0x10, "0X10", nonSmi16];
+
+for (var i = 0; i < radix_detect.length; i++) {
+  var radix = radix_detect[i];
+  assertEquals(NaN, parseInt("", radix));
+  assertEquals(23, parseInt("23", radix));
+  assertEquals(0xaf, parseInt("0xaf", radix));
+  assertEquals(NaN, parseInt("af", radix));
+}
+
+for (var i = 0; i < radix_invalid.length; i++) {
+  var radix = radix_invalid[i];
+  assertEquals(NaN, parseInt("", radix));
+  assertEquals(NaN, parseInt("23", radix));
+  assertEquals(NaN, parseInt("0xaf", radix));
+  assertEquals(NaN, parseInt("af", radix));
+}
+
+for (var i = 0; i < radix10.length; i++) {
+  var radix = radix10[i];
+  assertEquals(NaN, parseInt("", radix));
+  assertEquals(23, parseInt("23", radix));
+  assertEquals(0, parseInt("0xaf", radix));
+  assertEquals(NaN, parseInt("af", radix));
+}
+
+for (var i = 0; i < radix16.length; i++) {
+  var radix = radix16[i];
+  assertEquals(NaN, parseInt("", radix));
+  assertEquals(0x23, parseInt("23", radix));
+  assertEquals(0xaf, parseInt("0xaf", radix));
+  assertEquals(0xaf, parseInt("af", radix));
+}
+