Bulat Ziganshin wrote:
Hello Richard,
Tuesday, May 13, 2008, 6:10:54 PM, you wrote:
because I was compiling my splitAt with -O2 optimisation as opposed to the built-in version being compiled with -O. The extra optimisations in -O2 are a new feature of GHC (and -O2 is slower to compile which is why the built-in version doesn't use it, but that doesn't matter for the shootout).
-O2 is very old ghc feature and i think that ghc base library is compiled with -O2 - it's too obvious idea
In July 2007 -O2 was documented in GHC as making no difference to the speed of programs : http://www.haskell.org/pipermail/haskell-cafe/2007-July/029118.html and from this thread http://www.haskell.org/pipermail/haskell-cafe/2008-April/042155.html it appears to be currently unused for splitAt. I guess -O2 has however been around for a long time. Richard.