diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug678106.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug678106.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+function f_localinc(x) {
+    var a = x;
+    var b = a++;
+
+    var c = b+b+b+b+b+b+b+b+b+b;
+    return a + c;
+}
+assertEq(f_localinc(1), 12)
+function f_localdec(x) {
+    var a = x;
+    var b = a--;
+
+    var c = b+b+b+b+b+b+b+b+b+b;
+    return a + c;
+}
+assertEq(f_localdec(1), 10)
+function f_inclocal(x) {
+    var a = x;
+    var b = ++a;
+
+    var c = b+b+b+b+b+b+b+b+b+b;
+    return a + c;
+}
+assertEq(f_inclocal(1), 22)
+function f_declocal(x) {
+    var a = x;
+    var b = --a;
+
+    var c = b+b+b+b+b+b+b+b+b+b;
+    return a + c;
+}
+assertEq(f_declocal(1), 0)