#955: more object-code blow-up in ghc-6.8.3 vs. ghc-6.4.2 (both with
optimization)
--------------------------------------+-------------------------------------
Reporter: [EMAIL PROTECTED] | Owner:
Type: run-time performance bug | Status: closed
Priority: high | Milestone: 6.10.1
Component: Compiler | Version: 6.8.3
Severity: normal | Resolution: fixed
Keywords: object-code blow-up | Difficulty: Unknown
Testcase: | Architecture: Multiple
Os: Multiple |
--------------------------------------+-------------------------------------
Comment (by simonpj):
Just to say that I've now fixed those odd WARNINGs too.
{{{
Wed Sep 17 17:29:10 BST 2008 [EMAIL PROTECTED]
* Fix nasty infelicity: do not short-cut empty substitution in the
simplifier
I was perplexed about why an arity-related WARN was tripping. It took
me _day_ (sigh) to find that it was because SimplEnv.substExpr was
taking
a short cut when the substitution was empty, thereby not subsituting for
Ids in scope, which must be done (CoreSubst Note [Extending the Subst]).
The fix is a matter of deleting the "optimisation". Same with
CoreSubst.substSpec, although I don't know if that actually caused a
problem.
}}}
Great to have this ticket closed at last.
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/955#comment:22>
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
