Re: Re: Patches AMD 64 next try...
Wolfgang Müller <[email protected]>
| Newsgroups | gmane.comp.gnu.gift.general |
|---|---|
| Organization | Universität Bamberg |
| Message-ID | <[email protected]> |
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