When running on a 64-bit server, are 32-bit ints padded to 64-bit?

Specifically, I'm interested if I actually end up making my table any
smaller if I move from 64-bit integer primary key to 32-bit.  (Need to
keep the index as small as possible to fit in cache)

64-bit on Debian linux running on Intel CPUs, if that make a difference.


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