diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug909401.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug909401.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+var TZ_PST = -8;
+var TZ_DIFF = GetTimezoneOffset();
+var PST_DIFF = TZ_DIFF - TZ_PST;
+function GetTimezoneOffset() {}
+function adjustResultArray(ResultArray) {
+    var t = ResultArray[TIME] - PST_DIFF;
+    ResultArray[UTC_YEAR] = YearFromTime(t);
+}
+function TimeInYear( y ) {}
+function YearFromTime( t ) {
+    var sign = ( t < 0 ) ? -1 : 1;
+    var year = ( sign < 0 ) ? 1969 : 1970;
+    for ( var timeToTimeZero = t; ;  ) {
+	timeToTimeZero -= sign * TimeInYear(year)
+        break;
+    }
+    return ( year );
+}
+gczeal(4);
+evaluate("\
+var TIME        = 0;\
+var UTC_YEAR    = 1;\
+adjustResultArray([]);\
+adjustResultArray([946684800000-1]);\
+adjustResultArray([]);\
+", { noScriptRval : true });