Linus Torvalds writes: (Summary) An empty mask simply generally doesn't make sense,
since opn UP you also don't have any masking of CPU ops, so the mask is
ignored, and that helps the code generation immensely. But the
counter-argument to that is that if people are using UP in this day and
age, they probably are using some really crappy hardware that needs all the
help it can get.
help it can get.
At least for now, I'd rather have this inconsistency, because it really makes a surprisingly *big* difference in code generation.
help it can get.
At least for now, I'd rather have this inconsistency, because it really makes a surprisingly *big* difference in code generation.