diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/asm.js/testRangeAnalysis.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/asm.js/testRangeAnalysis.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// Bug 894781
+function m(stdlib)
+{
+  "use asm";
+  var abs = stdlib.Math.abs;
+  function f(d)
+  {
+    d = +d;
+    return (~~(5.0 - +abs(d)))|0;
+  }
+  return f;
+}
+var f = m(this);
+assertEq(f(0.2), 4);
+assertEq(f(NaN), 0);