#3116: missed opportunity for call-pattern specialisation
-----------------------------------------+----------------------------------
Reporter: duncan | Owner:
Type: run-time performance bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.1
Severity: normal | Resolution: fixed
Keywords: | Difficulty: Unknown
Testcase: eyeball/T3116.hs | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
-----------------------------------------+----------------------------------
Changes (by simonpj):
* testcase: => eyeball/T3116.hs
* status: new => closed
* resolution: => fixed
Comment:
The original (excellent) suggestion is implemented by this patch:
{{{
Wed Mar 25 09:52:05 GMT 2009 simo...@microsoft.com
* Improve mkDupableCont; and fix Trac #3116
It turns out that, as a result of a change I made a few months ago to
the representation of SimplCont, it's easy to solve the optimisation
challenge posed by Trac #3116. Hurrah.
Extensive comments in Note [Duplicating StrictArg].
M ./compiler/simplCore/SimplUtils.lhs -1 +1
M ./compiler/simplCore/Simplify.lhs -19 +67
}}}
Now you get perfect code for the example! Test in `eyeball/T3118.hs`.
I'm going to close this ticket; if you like, you can open another for the
more speculative idea you were proposing.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3116#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler_______________________________________________
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
