#4930: Case-of-case not eliminated when it could be
---------------------------------------------+------------------------------
Reporter: rl | Owner:
Type: bug | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 7.1
Resolution: fixed | Keywords:
Testcase: simplCore/should_compile/T4930 | Blockedby:
Difficulty: | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: Runtime performance bug |
---------------------------------------------+------------------------------
Changes (by simonpj):
* status: new => closed
* testcase: => simplCore/should_compile/T4930
* resolution: => fixed
Comment:
Good point. Fixed by
{{{
Tue Feb 1 12:26:37 GMT 2011 [email protected]
* Don't make join points when the case has only one non-bottom
alternative
This fixes Trac #4930. See Note [Bottom alternatives] in Simplify.lhs
M ./compiler/coreSyn/CoreUtils.lhs -1 +20
M ./compiler/simplCore/Simplify.lhs -7 +35
}}}
I don't think this is worth merging.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4930#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
_______________________________________________
Glasgow-haskell-bugs mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
