The 68000 was a practical example of where mapping int as the "most convenient" size isn't very clear even within a single CPU. The instruction set handled 32-bit integers well, but execution-wise 16-bit integers were faster. Some compilers like Lattice C defined int as int32, while others like Aztec C mapped it to int16.

One result of this is that a fair amount of C code targeted at 68000 systems used short instead int everywhere, and then had to be subsequently updated for CPUs that preferred int32 to int16. Occasionally collateral damage can be seen from this in mysterious comments like "check if the buffer is too int."