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Posted by Curt Zirzow on 01/02/06 21:47
On Fri, Dec 30, 2005 at 12:34:35PM -0600, Richard Lynch wrote:
> On Thu, December 29, 2005 5:37 pm, Michael Gross wrote:
> > Hello
> > I have to migrate a PHP-application to a new Linux-Box. Both the old
> > and
> > the new system are Linux and PHP 5.1.1. (the old one has a Pentium 4,
> > the new one two Xeon CPUs). I have a problem using the
> > Crypt_Xtea-Extension. I narrowed it down to the following right-shift
> > operation:
> >
> > (-3281063054 >> 11) produces different results:
> > Old System: 495070
> > New System: -1048576
> >
> > I understand that both results are "wrong", but everything worked with
> > the old behavior and I need that behavior back very urgent.
> >
> > Maybe someone can explain me in which way the bits are shifted so that
> > the result is 495070? If I understand it, I implement my "own" shift
> > function.
>
> Assuming the previous hypothesis that it's 32-bit versus 64-bit
> machines at work...
>
> If you can determine the number of bits on your system, you could use
> a different number from 11 on the two systems to get the answer you
> want.
>
> if (is_32_bit_machine()){
> $y = $x >> 11;
> }
> else{
> $y = $x >> 43; //11 + 32 (guess)
> }
>
> One hack for detecting 32-bit machine might be this:
Isn't php suppose to handle all this? This seems odd to me.
Curt.
--
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