diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/inline/mathFloor.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/inline/mathFloor.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+
+assertEq(Math.floor(3.14), 3);
+assertEq(Math.floor(-0), -0);
+assertEq(Math.floor(0), 0);
+assertEq(Math.floor(-1.23), -2);
+assertEq(Math.floor(2147483649), 2147483649);
+assertEq(Math.floor(2147483648.5), 2147483648);
+assertEq(Math.floor(2147483647.1), 2147483647);
+
+/* Inferred as floor(double). */
+function floor1(x) {
+    return Math.floor(x);
+}
+assertEq(floor1(10.3), 10);
+assertEq(floor1(-3.14), -4);
+assertEq(floor1(-0), -0); // recompile to return double
+assertEq(floor1(678.3), 678);
+
+/* Inferred as floor(double). */
+function floor2(x) {
+    return Math.floor(x);
+}
+assertEq(floor2(3.4), 3);
+assertEq(floor2(NaN), NaN); // recompile to return double
+assertEq(floor2(-4.4), -5);
+
+/* Inferred as floor(int). */
+function floor3(x) {
+    return Math.floor(x);
+}
+assertEq(floor3(4), 4);
+assertEq(floor3(-5), -5);
+assertEq(floor3(0), 0);
+