O2 mainly switches on two transformations: "liberate case" and "call-pattern specialisation". (I think it also gets passed on to gcc.)
Trying -O2 -fno-liberate-case, and -O2 -fno-spec-constr might tell which was making the difference. Simon | -----Original Message----- | From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of | Peter Hercek | Sent: 09 November 2007 14:19 | To: glasgow-haskell-users@haskell.org | Subject: Re: GHC 6.8.1 is impressive! | | New ghc sped up my small app (~2000 lines) by ~38%. Nice job! | Anyway, my application is a bit slower when compiled with -O2 | compared to -01 only (both with ghc 6.6 and 6.8). | Is that normal? | | Peter. | | Lennart Augustsson wrote: | > I'd like to second that. 6.8 is quite an improvement. Well done! | > | | _______________________________________________ | Glasgow-haskell-users mailing list | Glasgow-haskell-users@haskell.org | http://www.haskell.org/mailman/listinfo/glasgow-haskell-users _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
