[forrestthewoods]

Hell it's valid for everything period. Even vectors! Splitting struct a into hot/cold chunks is pretty common. Minimize the sise of data being iterated on to maximize cache usage. Can result in big wins.

[btown]

Huh, hadn't heard of hot/cold struct splitting before. This paper seems to indicate it has a nontrivial effect even in Java code: http://research.microsoft.com/en-us/um/people/trishulc/paper...