Bugs item #630807, was opened at 2002-10-30 00:12 You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=108032&aid=630807&group_id=8032
Category: Compiler Group: 5.04.1 >Status: Closed >Resolution: Fixed Priority: 5 Submitted By: Nobody/Anonymous (nobody) >Assigned to: Simon Peyton Jones (simonpj) Summary: -O2 generates wrong code Initial Comment: I have a program (the Bluespec compiler), where using -O2 generates a program that loops (or at least is VERY slow), whereas not using generates a working program. I can't really give you the source code, but perhaps you can contact me and we can see if we can work something out. -- Lennart [EMAIL PROTECTED] ---------------------------------------------------------------------- >Comment By: Simon Marlow (simonmar) Date: 2002-12-13 10:47 Message: Logged In: YES user_id=48280 Fixed in rev. 1.140 of Simplify.lhs, fix will be in 5.04.3 (if we release it). ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2002-10-30 18:31 Message: Logged In: NO Further investigations show that the generated code is not looping, it is indeed correct, but it's just been incredibly pessimised. On a smaller example the unoptmized code finishes in 0.02s and the optmized code in 18s. It seem that the complexity of the (very complicated) algorithm has suddenly become exponential with -O2. ---------------------------------------------------------------------- Comment By: Nobody/Anonymous (nobody) Date: 2002-10-30 00:14 Message: Logged In: NO BTW, this bug is in 5.02 too. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=108032&aid=630807&group_id=8032 _______________________________________________ Glasgow-haskell-bugs mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
