mozilla/rust — pull request #13880 by TeXitoi (2014-05-01 14:17:49+00:00)
Title: BigUint always use u64 as the internal machine unsigned integer

This change allow a speedup of ~1.5 on shootout-pidigits on a i32
system. `MachineUint` is used to abstract the internal machine
unsigned integer to simplity future architecture specialization.