In the CUDA programmers manual there are a number of references to the use of 64-bit integer arithmetic, including some intrinsic functions operating on 64-bit and even 128-bit integers.

Theres no information on whether or not the standard integer arithmetic and logical operators apply to them, how fast these operations are, how to declare 64-bit and 128bit variables, whether or not arrays of them can be declared.

has anyone experimented with these operations?