Re: [help-GIFT] Re: Patches AMD 64 next try...

[Wolfgang Müller]

On Tuesday 27 February 2007 21:11, you wrote:

Great! GDB is good :-) .

> this goes away if you change x or y into a uint64_t.
>
> i'm scared. i'd love an answer to this one. other than "magic."

No it's not magic :-) in one case you do a 32 bit addition to a 64 bit value. 
Bit 31 overflows, but it is ignored. In fact, you have done a addition of a 
negative 32 bit number to the 64 bit base address.

If you do a 64 bit addition, bit 31 overflows into bit 32 and is taken into 
account. Everything right. "Alles palletti :-) " as some people say over 
here. Any protests?

This seems to be it, correct? We just have to check that all indexes stay in 
our 256x256 square.

Cheers,
Wolfgang

-- 
Dr. Wolfgang Müller
LS Medieninformatik
Universität Bamberg
Check out the SIG MM web site http://www.sigmm.org