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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
full laziness
A transformation, described by
Wadsworth in 1971, which ensures that subexpressions in a
function body which do not depend on the function's arguments
are only evaluated once. E.g. each time the function
f x = x + sqrt 4
is applied, (sqrt 4) will be evaluated. Since (sqrt 4) does
not depend on x, we could transform this to:
f x = x + sqrt4
sqrt4 = sqrt 4
We have replaced the dynamically created (sqrt 4) with a
single shared constant which, in a graph reduction system,
will be evaluated the first time it is needed and then updated
with its value.
See also fully lazy lambda lifting, let floating.
(1994-11-09)