Integer overflow and underflow semantics?

[Kagamin via Digitalmars-d]

On Tuesday, 22 July 2014 at 15:31:22 UTC, Ola Fosheim Grøstad 
wrote:
> A system level language should encourage using the fastest 
> opcode, so you shouldn't enforce 32 bit masking when the 
> fastest register size is 64 bit etc.

This is what int_fast32_t is for, but unfortunately it's not 
guaranteed to be the fastest, but you can use something similar.