Support Integer-Constant-Type Suffixes on 64-Bit Architecture

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March 10, 2009 9:00 PM PDT


Challenge

Modify code to support the use of integer-constant-type suffixes on 64-bit Intel® architecture. If integer-constant-type suffixes are used in the code, you might need to modify the code for use on 64-bit Intel architecture, because the L or l suffix (meaning long) in Windows* 2000 (64-bit) is a 32-bit type. Windows 2000 (64-bit) uses the i64 suffix.

Solution

Add a centrally defined macro in the file. This change will make the code generic so that it can be compiled for use on both the UNIX/64* and the Windows 2000 (64-bit) operating systems.

The following code shows the relevant section of the file:

#ifdef _WIN64 
#define CONST3264(a) (a##i64) 
#else 
#define CONST3264(a) (a##L) 
#endif

 

The corresponding source code is as follows:

// from UNIX/64-cleaned code 
const long ll= 3015L;

 

The Windows 2000 post-compile result is as follows:

const long ll= CONST3264(3015);

Related information about migrating other types of constants from 32-bit Intel architecture to 64-bit Intel architecture is covered in the following separate items:

 

Source

Preparing Code for the IA-64 Architecture (Code Clean)