If a difference appears, I believe
http://blog.johantibell.com/2010/09/static-argument-transformation.htmlwould
be involved. Also, the second map function could be inlined by GHC,
avoiding calling "f" through a pointer because at the call site, we know
what 'f' is (this is also mentionned in the blog post by Johan).
On Wed, Feb 13, 2013 at 9:55 AM, Andrew Polonsky
Hello,
Is there any difference in efficiency between these two functions, when compiled with all optimizations?
map f [] = [] map f (a:as) = f a : map f as
and
map f x = map' x where map' [] = [] map' (a:as) = f a : map' as
Thanks, Andrew
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