3 ms·
> I do not understand your argument about branches, how would it hinder the jump instructions? Extra set of logic for handling NaN cases? I don't think it's im
by lock1 1y ago
> I do not understand your argument about branches, how would it hinder the jump instructions?
Extra set of logic for handling NaN cases? I don't think it's impossible, just kind of less intuitive. Jump instruction using integer w/o NaN always valid, while NaN-able integer sometimes invalid (ignoring whether the memory address can be accessed).
- newpavlov 1y agoFor absolute jumps you don't need extra logic, since CPUs could declare the last page always unmapped, so such jumps would always result in a page fault (similarly to the null page on most systems). For relative non-immediate jumps the added logic is extremely simple (hardware exception on NaN) and should not (AFAIK) hinder performance of jumps in any way.