Re: int vs binary questions

["Beppe Costagliola" <beppecosta@xxxxxxxx>]

Can you add float ops ?
It would be interesting to add this results to your tables.
Beppe.

----- Original Message ----- 
From: "Steve Richter" <srichter@xxxxxxxxxxxxx>
To: "RPG programming on the AS400 / iSeries" <rpg400-l@xxxxxxxxxxxx>
Sent: Monday, February 09, 2004 11:33 PM
Subject: RE: int vs binary questions


> here are my lastest results ( on a 170/2389 )
>
> assignment
>   bin to int  2399 msecs
>   int to int  1187
>   bin to bin  908
>   pkd to pkd  2946
>   big int to big int 686
>
> assigning a 20i 0 to another 20i 0 runs 90% faster than 10i 0 to 10i 0.
>
> addition
>   add a constant to
>      int  490 msecs
>      big int 488 msecs
>      bin  9773 msecs
>      pkd(7,0)  1756 msecs
>
> no difference in add performance on the 170 between 10i 0 and 20i 0.
>
> -Steve
>
> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx
> [mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Colin Williams
> Sent: Monday, February 09, 2004 4:42 PM
> To: RPG programming on the AS400 / iSeries
> Subject: Re: int vs binary questions
>
>
> Hans,
>
> does this mean theres a performance benefit in defining int's as 20i0
>
> cheers
> Colin.W
>
> ----- Original Message -----
> From: "Hans Boldt" <boldt@xxxxxxxxxx>
> To: <rpg400-l@xxxxxxxxxxxx>
> Sent: Monday, February 09, 2004 8:09 PM
> Subject: Re: int vs binary questions
>
>
> > cozzi@xxxxxxxxx wrote:
> >
> > >    Hans,
> > >    That's all well and good, but...
> > >    1) Why is DDS limited to 2 and 4 byte binaries and seems to use the
> > >    RPG-like declaration for them (or has that changed?)
> > >    2) Why would the timing of int->int copy be slower than Bin->Bin in
> RPG IV
> > >    as was reported here earlier today?
> > >
> >
> >
> > 1) DDS is NOT limited to 2 and 4 byte binaries. DDS also supports 8 byte
> > binaries.
> >
> > 2) Why did Steve report faster timings on bin->bin copy compared to
> > int->int copy?  First, on a simple "EVAL B1=B2;" copy from binary to
> > binary where both variables have the same size, no conversion happens.
> > In W-Code, we do just a LOD and STR. For an assignment "EVAL I1=I2;", it
> > actually is a little bit more complicated. If I1 and I2 are defined as
> > 20I0, there's a LOD and STR which runs at around the same speed as the
> > binary. However, if the source argument is not 20I0, the compiler emits
> > a "convert to 8-byte integer" instruction first, and that tends to slow
> > things down a little bit. The performance difference disappears with
> > optimization, however.
> >
> > Cheers! Hans
> >
> > _______________________________________________
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>
>
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