I don't know of any programs to check correct execution of sse, but I also haven't looked for one. The only thing that makes the findCluster sse routine (which is the only one that doesn't work correctly on your computer) different from the other sse routines is that it uses the 'comiss' instruction. The rest of it is almost exactly the same as one of the other routines which works correctly.
Maybe someone else with an athlon xp can test?
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