diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug679493-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug679493-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+// IM: Test generated code
+function neg(x) {
+    return -x;
+}
+assertEq(neg(0), -0);
+assertEq(neg(1), -1);
+assertEq(neg(-1), 1);
+assertEq(neg(-2147483648), 2147483648);
+assertEq(neg(-1.3), 1.3);
+assertEq(neg(1.45), -1.45);
+
+// IM: Test constant folding
+function neg2(){
+    var x = 1;
+    var y = -x;
+    return y;
+}
+assertEq(neg2(), -1);
+function neg3(){
+    var x = 0;
+    var y = -x;
+    return y;
+}
+assertEq(neg3(), -0);
+function neg4(){
+    var x = -2147483648;
+    var y = -x;
+    return y;
+}
+assertEq(neg4(), 2147483648);