On 26 November 2014 at 16:48, Mathias Roslund <mathias.rosl...@amidog.se> wrote: > Since then I've added more instructions and gotten to the point where most > stuff seems to be working. My current issue is that signed divide and all > shift operations insists on sign/zero extending the operands, resulting in > 32bit operations even when only 8bit ones would be required.
That's a matter of the input language. In C, you get default promotions to int from narrower integer types. > Interestingly, > multiplies and unsigned divides behave as desired, i.e. only operate on the > required number of bits. That's because the results are the same regardless, and the optimizers are able to undo the effects of the type promotions.
