Yeah, I knew it was fairly unlikely that I was the first to think of
this optimization ;-)
I just reported the "run-time performance bug" as
http://hackage.haskell.org/trac/ghc/ticket/2902
I am using an Intel Core 2 Duo MacBook and GHC 6.10.1, OS X 10.5.6.
For the toy example that I submitted, the difference is over a factor
of 3x.
Thanks,
Dave
On Dec 29, 2008, at 6:23 AM, Simon Peyton-Jones wrote:
Which version of GHC are you using? GHC 6.10 implements
automatically precisely the transformation you give below.
If the difference shows up in GHC 6.10, could you spare a moment to
produce a reproducible test case, and record it in GHC's bug tracker?
Thanks
Simon
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