Really bad code for single method dictionaries?
simonpj at microsoft.com
Fri Mar 27 04:07:20 EDT 2009
I would like to know more too. No one told me!
| -----Original Message-----
| From: glasgow-haskell-users-bounces at haskell.org [mailto:glasgow-haskell-users-
| bounces at haskell.org] On Behalf Of Jason Dusek
| Sent: 26 March 2009 23:30
| To: glasgow-haskell-users at haskell.org
| Subject: Really bad code for single method dictionaries?
| I was reading the stream fusion code today and came across a comment stating
| that single element dictionaries interacted poorly with GHC's optimizer:
| class Unlifted a where
| expose [...]
| -- | This makes GHC's optimiser happier; it sometimes produces really bad
| -- code for single-method dictionaries
| unlifted_dummy [...]
| A cursory search on GHC's Trac shows no corresponding bug; is this no longer
| a problem? A small problem? I would like to know more about it.
| Jason Dusek
| |...stream fusion code...|
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