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?
Thank you Pierre for idea!
But it is not my problem. I get correct results:
for extended: 1.3338204491362411E+0000
for fouble: 1.33382044913624E+000
Because I do not have "old" Pentium CPU, but newer GenuineIntel Intel(R)
Celeron(R) CPU 1.70GHz [x86 Family 15 Model 1 Stepping 3]
Thanks
-Laco.
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