These are the lengths of the data types in bytes:
byte 1
int 2
long int 4
double 4...
Anyway, based on these results, looks like the Diecimila is about a 0.1 megaflop device, using 4-byte floats/doubles.
I'm too lazy to check for myself, but won't a float be 4 bytes and a double be 8 bytes? (Referring to: Fundamental types - cppreference.com)
--Phil.