Sample Program
The following sample program directly illustrates the effect of the LP64 versus ILP32 data models. The same program can be compiled as either a 32-bit program or a 64-bit program.
Note -
The default compilation environment is designed to maximize portability, that is, to create 32-bit applications.
% cat foo.c
#include <stdio.h>
int
main(int argc, char *argv[])
{
(void) printf("char is \t\t%lu bytes\n", sizeof (char));
(void) printf("short is \t%lu bytes\n", sizeof (short));
(void) printf("int is \t\t%lu bytes\n", sizeof (int));
(void) printf("long is \t\t%lu bytes\n", sizeof (long));
(void) printf("long long is \t\t%lu bytes\n", sizeof (long long));
(void) printf("pointer is \t%lu bytes\n", sizeof (void *));
return (0);
}
|
32-bit Compilation
% cc -O -o foo32 foo.c % foo32 char is 1 bytes short is 2 bytes int is 4 bytes long is 4 bytes long long is 8 bytes pointer is 4 bytes |
64-bit Compilation
% cc -xarch=v9 -O -o foo64 foo.c % foo64 char is 1 bytes short is 2 bytes int is 4 bytes long is 8 bytes long long is 8 bytes pointer is 8 bytes |
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