Word:

let floating

(programming)let floating - A program transformation used in functional programming to implement full laziness. E.g. the function

f x = x + sqrt 4

can be expressed as

f x = let t = sqrt 4 in x + t

but note that t does not depend on the argument x so we can automatically transform this to

t = sqrt 4 f x = x + t

Making t into a global constant which need only be evaluated at most once, rather than every time f is called. The general idea is to float each subexpression as far out (toward the top level) as possible to maximise sharing.
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