On May 19, 2009 22:17:39 Tyson Whitehead wrote: > 2- specialize count for step = iter > > <snip> > > 3- specializing iter for next = count > > <snip> >
I changed this just before sending it and managed to goof step two and three (the specializations). The whole thing, with the correct steps two and three should have been the following 1- avoid forming the (iter xs) and (count i+1) closures by passing the function and the arguments instead of the function bound to the argument iter [] next i done = done iter (x:xs) next i done = next i x iter xs count i x step xs = step xs count (i+1) (i+1) test xs = iter xs count 0 0 2- specialize iter for next = count iter [] next i done = done iter (x:xs) next i done = next i x iter xs iter' [] i done = done iter' (x:xs) i done = count i x iter xs count i x step xs = step xs count (i+1) (i+1) test xs = iter' xs 0 0 3- specialize count for step = iter (and use the specialized iter') iter [] next i done = done iter (x:xs) next i done = next i x iter xs iter' [] i done = done iter' (x:xs) i done = count' i x xs count i x step xs = step xs count (i+1) (i+1) count' i x xs = iter' xs (i+1) (i+1) test xs = iter' xs 0 0 (iter and count are no longer used and can be dropped at this point) 4- inline count' iter' [] i done = done iter' (x:xs) i done = iter' xs (i+1) (i+1) count' i x xs = iter' xs (i+1) (i+1) test xs = iter' xs 0 0 (count is no longer used and can be dropped at this point) 5- eliminate the done argument as it is always the same as the i argument iter'' [] i = i iter'' (x:xs) i = iter'' xs (i+1) test xs = iter'' xs 0 As the first one does not seem to be being performed, I did it manually to see if that would be enough that GHC would pickup on the rest. It seems that this isn't the case. The second two are not being done as well. Cheers! -Tyson
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