[Insight-users] itkIntTypes

[Luis Ibanez]

Hi Michael,

Ah! the joy of open source is
to be able to look a the code  :-)


If you look at the itkIntTypes.h you will find
the definitions of ITK_INT32 and ITK_INT64.


They are

> typedef int       ITK_INT32;
> 
> #ifndef _WIN32
> typedef long long   ITK_INT64;
> #endif
> 
> #ifdef _WIN32
> typedef long      ITK_INT64;


Which means that your current configuration
of VisualStudio 6.0 is not considering "long"
as a 64 bits integer, and therefore is wasting
your investment in those 64bits of your AMD Athlon
processor.

This is not an ITK issue but a problem with your
configuration of VisualStudio.

You must setup your Visual Studio for building 64
bits applications. Please look at the following link
for instructions on how to setup your Visual Studio 6.0.

http://www.devx.com/amd/Article/21313?trk=Homepage_PN_AMD


Note also that you should get a WindowsXP with support
for 64 bits processors:

http://www.microsoft.com/windowsxp/64bit/default.mspx


Surprisingly,
    you can get on upgrade from Microsoft *for free*

http://www.microsoft.com/windowsxp/64bit/evaluation/upgrade.mspx




  Regards,


    Luis


------------------------
michakuhn at gmx.ch wrote:

> Hi,
> 
> I expected that sizeof(ITK_INT64) and sizeof(ITK_INT32) yield different
> results. Is this the supposed behavior? The following program couldn't
> confirm that:
> 
> ------
> 
> #include "itkIntTypes.h"
> #include <iostream>
> #include <climits>
> 
> int main()
> {
> 	std::cout << "number of bits per byte: " << 
> 		CHAR_BIT << std::endl;
> 
> 	std::cout << "sizeof(char): " << 
> 		sizeof(char) << std::endl;
> 
> 	std::cout << "sizeof(int): " << 
> 		sizeof(int) << std::endl;
> 
> 	std::cout << "sizeof(long): " << 
> 		sizeof(long) << std::endl;
> 
> 	std::cout << "sizeof(double): " << 
> 		sizeof(double) << std::endl;
> 
> 	std::cout << "sizeof(ITK_UINT64): " << 
> 		sizeof(ITK_UINT64) << std::endl;
> 
> 	std::cout << "sizeof(ITK_INT64): " << 
> 		sizeof(ITK_INT64) << std::endl;
> 
> 	std::cout << "sizeof(ITK_UINT32): " << 
> 		sizeof(ITK_UINT32) << std::endl;
> 
> 	std::cout << "sizeof(ITK_INT32): " << 
> 		sizeof(ITK_INT32) << std::endl;
> 
> 	return 0;
> }
> 
> -----
> 
> The program produced the follwing output:
> 
> -----
> 
> number of bits per byte: 8
> sizeof(char): 1
> sizeof(int): 4
> sizeof(long): 4
> sizeof(double): 8
> sizeof(ITK_UINT64): 4
> sizeof(ITK_INT64): 4
> sizeof(ITK_UINT32): 4
> sizeof(ITK_INT32): 4
> 
> -----
> 
> I compiled the program with Visual Studio 6 on a Windows XP machine with an
> AMD Athlon Processor.
> 
> Thanks,
> 
> Michael
> 
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