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

From: Wolfgang Müller
Subject: Re: [help-GIFT] Re: Patches AMD 64 next try...
Date: Wed, 28 Feb 2007 15:33:45 +0100
User-agent: KMail/1.9.1

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.


Dr. Wolfgang Müller
LS Medieninformatik
Universität Bamberg
Check out the SIG MM web site

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