C2 distinguishes reduction into ordered and unordered. When vectorizing,
unordered floating-point add reduction may get different value compared
with it in order. Vector API does not define the order of reduction
intentionally, which allows platforms to generate more efficient codes
probably [1].

[1] https://github.com/openjdk/jdk/blob/master/src/jdk.incubator.vector/share/classes/jdk/incubator/vector/FloatVector.java#L2529