example = a + b + a + b
exampleCSE = x + x
where x = a + b
With CSE we are introducing new thunk: x.
18.02.2012 17:38, Roman Cheplyaka пишет:
* Holger Siegel<holgersiege...@yahoo.de> [2012-02-18 12:52:08+0100]
You cannot. Common subexpression elimination is done by GHC very
conservatively, because it can not only affect impure programs: it can
also affects strictness/lazyness and worsen memory usage of pure code.
Like the HaskellWiki says: "If you care about CSE, do it by hand."
How can it affect strictness or laziness?
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