Did you check that infamous coprocessor Pentium FDIV bug?
http://en.wikipedia.org/wiki/Pentium_FDIV_bug#Affected_models
The even give values to test:
The correct value is
4195835/3145727 = 1.333820449136241002
However, the value returned by the flawed Pentium is incorrect at or beyond
four digits:[9]
4195835/3145727 = 1.333739068902037589
Maybe that is your problem?
Pierre
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