what is the performance impact of using int64_t instead of int32_t on 32-bit systems?

Question

Our C++ library currently uses time_t for storing time values. I\'m beginning to need sub-second precision in some places, so a larger data type will be necessary there anyw

Answer 1

Addition/subtraction basically becomes two cycles each, multiplication and division depend on the actual CPU. The general perfomance impact will be rather low.

Note that Intel Core 2 supports EM64T.