diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/Array-reducePar-mul.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/Array-reducePar-mul.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+load(libdir + "parallelarray-helpers.js");
+
+function testReduce() {
+  // This test is interesting because during warmup v*p remains an
+  // integer but this ceases to be true once real execution proceeds.
+  // By the end, it will just be infinity. Note that this is a case
+  // where the non-commutative of floating point becomes relevant,
+  // so we must use assertAlmostEq.
+  function mul(v, p) { return v*p; }
+  var array = range(1, 513);
+  assertArraySeqParResultsEq(array, "reduce", mul, assertAlmostEq);
+}
+
+if (getBuildConfiguration().parallelJS)
+  testReduce();