diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/hypot-approx.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/hypot-approx.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+loadRelativeToScript("../../../tests/ecma_6/Math/shell.js");
+
+for (var i = -20; i < 20; i++) {
+    assertEq(Math.hypot(+0, i), Math.abs(i));
+    assertEq(Math.hypot(-0, i), Math.abs(i));
+}
+
+// The implementation must avoid underlow.
+// The implementation must avoid overflow, where possible.
+// The implementation must minimise rounding errors.
+
+assertNear(Math.hypot(1e-300, 1e-300), 1.414213562373095e-300);
+assertNear(Math.hypot(1e-300, 1e-300, 1e-300), 1.732050807568877e-300);
+
+assertNear(Math.hypot(1e-3, 1e-3, 1e-3), 0.0017320508075688772);
+
+assertNear(Math.hypot(1e300, 1e300), 1.4142135623730952e+300);
+assertNear(Math.hypot(1e100, 1e200, 1e300), 1e300);
+
+assertNear(Math.hypot(1e3, 1e-3), 1000.0000000005);
+assertNear(Math.hypot(1e-300, 1e300), 1e300);
+assertNear(Math.hypot(1e3, 1e-3, 1e3, 1e-3), 1414.2135623738021555);
+
+for (var i = 1, j = 1; i < 2; i += 0.05, j += 0.05)
+    assertNear(Math.hypot(i, j), Math.sqrt(i * i + j * j));