[maemo-developers] DSP vs. ARM endianness and struct packing

[From: Simon Pickering]

> Using the following struct on the DSP-side:
> 
> typedef struct endian_test_struct {
>     unsigned long iamulong1;
>     unsigned int iamuint1;
>     unsigned int iamuint2;
>     unsigned long iamulong2;
>     unsigned int iamuint3;
>     unsigned long iamulong3;
> } endian_test_struct;

I should qualify this:

On the DSP the types have the following sizes:

Char = short = int = 16bit
Long = 32bit

> For comparison here's the same struct filled and viewed on 
> the ARM (with no
> optimisation flags):

Ah, my mistake, I thought I'd altered the types of the struct members on the ARM
side to be the same sizes as on the DSP side; I was going to email and give the
correct struct for the ARM side, but it looks like I copied the wrong one (i.e.
the same member types which are all 32bit on the ARM). So ignore the ARM results
for now, I'll re-do those.

/me slopes away slightly embarrassed


Simon