Re: [ts-7000] size and byte order of ints

[Andrew Gaylard <>]

Yan Seiner wrote:

>Anyone know off-hand where I can find a reference to the length of
>various ints on the arm chip?
>
>I need to allocate 16, 32, and 64 unsigned ints, and I don't know if
>such animals exist on the arm....
>
>Also, I've read that the arm can be both big-endian and little-endian.
> How does one go about determining which variant we have?  Or is it
>software-set?
>
>--Yan
>  
>
Hello Yan,

I use this little bit of C to find out (this is on my DEC Alpha):

 ~/wip $ cat sizes.c
#include <stdio.h>
#include <stdint.h>

int main( int c, char ** v )
{
        printf( "size of char      = %ld\n", sizeof( char ) );
        printf( "size of short     = %ld\n", sizeof( short ) );
        printf( "size of int       = %ld\n", sizeof( int ) );
        printf( "size of long      = %ld\n", sizeof( long ) );
        printf( "size of long long = %ld\n", sizeof( long long ) );
        printf( "size of float     = %ld\n", sizeof( float ) );
        printf( "size of double    = %ld\n", sizeof( double ) );
        printf( "size of void *    = %ld\n", sizeof( void * ) );
        printf( "size of size_t    = %ld\n", sizeof( size_t ) );
        printf( "size of uintmax_t = %ld\n", sizeof( uintmax_t ) );
        return 0;
}

 ~/wip $ gcc -o sizes sizes.c
 ~/wip $ ./sizes
size of char      = 1
size of short     = 2
size of int       = 4
size of long      = 8
size of long long = 8
size of float     = 4
size of double    = 8
size of void *    = 8
size of size_t    = 8
size of uintmax_t = 8

 ~/wip $ arm-9tdmi-linux-gnu-gcc -o sizes sizes.c

# and now on my TS-7200:
-bash-3.1# ./sizes
size of char      = 1
size of short     = 2
size of int       = 4
size of long      = 4
size of long long = 8
size of float     = 4
size of double    = 8
size of void *    = 4
size of size_t    = 4
size of uintmax_t = 8

Hope this helps,
Andrew.


 
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