Re: Re[2]: Date * 10000.01

Eric, et al...

Sears went into a rather extensive tirade on the happenings under the
covers when this kinda stuff is done intentionally to do date conversions.
He informed the session at Common on the details and he wasn't too
impressed with folks that still used it...eh, oh well...it works John, but
it's a MAJOR waste of cycles...  Seems that the o/s has to do some major
thinking about what it has to do with the parts that over/under flow...

Oh well...on to more important things...

Don in DC



On Wed, 18 Nov 1998, Eric DeLong wrote:

> 
>      No and no.
>      
>      As I recall, the actual overhead come in when truncating the 
>      arithmetic result into a smaller field. If you look at what's 
>      happening, you can see the inefficiency.
>      
>      12311995 x 10000.0001 = 123119951231.1995 
>      
>      then move the result into a numeric field 8.0. Remember, when 
>      moving numeric to numeric, the fields have to realign by decimal 
>      point, then the values are cast into the result field. That's quite 
>      a bit of work the program has to accomplish just to truncate a 
>      large result into a smaller field. 
>      
>      eric.delong@pmsi-services.com
> 
> 
> ______________________________ Reply Separator 
>_________________________________
> Subject: Re: Date * 10000.01 
> Author:  <MIDRANGE-L@midrange.com > at INET_WACO
> Date:    11/18/98 3:24 PM
> 
> 
> > I strongly agree with Hans.  We did specific performance testing on this
> > function in RPG III, and found it to be 48 times more expensive from a CPU
> > perspective.
> >
> > Al
> 
> Does this mean that 400 has some extremely weak mathematical processing, or 
> is it just the compiler that is badly written?
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