diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/eliminate-unreachable-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/eliminate-unreachable-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+// Test for one annoying case of the EliminateUnreachableCode
+// optimization.  Here the dominators change and also phis are
+// eliminated.
+
+function test1(v) {
+  var i = 0;
+  if (v) {
+    if (v) {
+      i += 1;
+    } else {
+      i += 10;
+    }
+    i += 100;
+  } else {
+    if (v) {
+      i += 1000;
+    } else {
+      i += 10000;
+    }
+    i += 100000;
+  }
+  i += 1000000;
+  return i;
+}
+
+function test() {
+  assertEq(test1(true), 1000101);
+  assertEq(test1(false), 1110000);
+}
+
+for (var i = 0; i < 100; i++)
+  test();