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64 bit good 32 bit bad?

BlitzMax Forums/BlitzMax Programming/64 bit good 32 bit bad?

Arowx(Posted 2010) [#1]
The alpha version of my game (http://savethesillyearthlings.com) which I tested works fine on my 64bit Vista PC but a user reported the dreaded 'APPLICATION EXCEPTION' (AE) on Windows 7 (which I don't have) anyway tested it on my laptop (32bit Vista) and second turn boom AE!

WTF? Why does a 32 bit game work fine in a 64bit version of windows and fall over in 32 bit?

Any ideas?

Or if you have a different flavour/bit size of windows, that you could test it on please download it from...

http://www.savethesillyearthlings.com

And let me know if it AE's on you, just play the game to about turn 5 as so far the AE has occured in the second turn when I test it.

Kind Regards
Al


Ghost Dancer(Posted 2010) [#2]
Just tried it on XP and it AEed a few years into turn 1 (after I prevented numerous disasters lol)

Like the idea BTW but didn't fully understand what I was doing. A tutorial would be really helpful I think :)


Arowx(Posted 2010) [#3]
OK so just to confirm that's 32 bit?


Ghost Dancer(Posted 2010) [#4]
yeah sorry, its 32 bit


Arowx(Posted 2010) [#5]
Yep I'm thinking of doing an easter island tutorial but with wood instead of oil as the resource, hmm?


Arowx(Posted 2010) [#6]
Update I think it was an an address space issue, a large array was being indexed beyond it's size and was not appearing as a problem on the 64 bit system probably because of it's larger address space!?


Brucey(Posted 2010) [#7]
a large array was being indexed beyond it's size and was not appearing as a problem on the 64 bit system

A bug is a bug is a bug.

64bit libs and code can sit in the higher address space, but your 32bit app will only ever be able to address upto 2gb. Of course, on a 64bit system, you are likely to have more 32bit RAM to play with before you run out. If you give it enough time, your game will crash on 64bit too.


TomToad(Posted 2010) [#8]
Did you by any chance rebuild the modules using a 64 bit version of MinGW or fasm? Try recompiling the program on a 32 bit machine or on a fresh install of BlitzMAX and see what happens.


Arowx(Posted 2010) [#9]
It's built with BlitzMax 1.41 MinGW 32 bit not sure which version?

You can try the game here http://savethesillyearthlings.com/

It's the latest build and so far has not, in limited testing, generated an application exception.

So far so good, fingers crossed!