Duncan Coutts wrote:
On Fri, 2007-05-04 at 19:28 +0100, Adrian Hey wrote:
Hello,
The GHC users guide says overloading "is death to performance if
left to linger in an inner loop" and one thing I noticed while
playing about with the AVL lib was that using a HOF and passing
the (overloaded) compare function as an explicit argument at the
start seemed to give noticable a performance boost (compared with
dictionary passing presumably).
I'm not sure why that should be, but has anyone else noticed this?
One might hope that in this case we could hoist the extraction of the
dictionary members outside the inner loop.
In theory at least, case liberation (on with -O2) does this sort of thing.
(BTW Simon: it looks like -fliberate-case-threshold was replaced by
-fspec-threshold, but the change wasn't propagated to the docs).
Cheers,
Simon
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