diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug739854.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug739854.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function test(x) {
+    switch(x) {
+        case 0:
+          return 0;
+        default:
+          return -1;
+    }
+}
+
+for(var i=0; i<100; i++) {
+    assertEq(test(-0), 0);
+}