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| subject: | Re: Floating point feature with optimization |
* Crossposted in OS2PROG
* Crossposted in OS2.PROG.GER
* Crossposted in OS2NET.PROGRAMMIERUNG.GER
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* Forwarded von Thomas Seeling (2:244/1130.42)
* Area : emx
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From:
> The difference is caused by the fact that the optimized program stores
> the variable 'd' in a register with a higher floating point precision
> than if it were stored in memory, as is the case with the variable
> 'D'. The higher precision gives a different result of the 'if'-test,
> and thus a different program flow.
You can overcome this particular problem (if it's really a
problem for you - It was for us) by setting the FPU to only operate in
double (or single) precision. This will prevent the extra precision in
the 80-bit FPU registers from being used.
--
Chris Green
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