On 5/19/15 4:01 PM, deadalnix wrote:
Have you tried things like :(x >> bsr(x)) == 1 ? I have no idea if this is faster or not, but worth trying.
Hm.. I think this would always succeed. Perhaps you mean: 1 << bsr(x) == x; And ironically, still doesn't work for 0 :DIIRC, bsr is a binary search (even when it's an instruction), I doubt it's as fast as subtraction and logic-and.
-Steve