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echo: os2prog
to: All
from: Thomas Seeling
date: 1997-01-18 11:02:42
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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