diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug597378.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug597378.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// vim: set ts=8 sts=4 et sw=4 tw=99:
+function f(a, b) {
+    var o = a;
+    var q = b;
+    var p;
+    do { } while (0);
+    p = o;
+    q = p + 1 < q ? p + 1 : 0;
+    assertEq(q, 0);
+}
+f(3, 4);
+