Feasible? Very. Detrimental to performance on average, though. I remember sitting through many LP64 versus ILP64 meetings almost 20 years ago when the transit

Feasible? Very. Detrimental to performance on average, though. I remember sitting through many LP64 versus ILP64 meetings almost 20 years ago when the transition to 64-bit was upon us. (At least upon us CPU designers...) Turns out 64 bit ints cause memory usage and cache pressure that outweigh the benefits. A lot of people don't think about the effect of design decisions on cache performance. Die area devoted to cache can't be used for other things, and the process of filling the cache with larger entities impacts memory bandwidth utilization. So 64 bit ints when mostly you only need 32 bits can turn out to be a loser. This is also why the pendulum has swung back to CISC -- more functionality crammed into smaller cache footprint, and the compilers are much better at targeting CISC instruction sets than they were at the height of RISC.