conal at conal.net
Fri Mar 28 21:53:15 EDT 2008
I'd like to know if it's possible to get GHC to perform some simple CSE for
function-level programming. Here's a simple example:
liftA2 (*) sin sin :: Double -> Double
which inlines and simplifies to
\ t -> sin t * sin t
A more realistic, equivalent, example:
let b = sin <$> id in liftA2 (*) b b
Can GHC be nudged into computing 'sin t' once rather than twice?
Thanks, - Conal
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