diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug677871.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug677871.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+function f0(p0,p1,p2,p3,p4,p5,p6) {
+    var v0;
+    var v1;
+    if (v1) {
+        do {
+            v0 = v0 + p3;
+            v1 = p3 + p3 + v1 + v0;
+            if (v1) {
+                v0 = v0 + p1 + p4 + p2 + p0 + v1;
+                continue;
+            }
+            break;
+        } while (v0);
+    }
+    v0 + v1;
+}
+assertEq(f0(1,2,3,4,5,6), undefined);
+