Tuning -funfolding-use-threshhold

Does this thread on haskell-cafe, about getting better bit shifting results, indicate we should be tweaking the default unfolding-use threshold? Do the recent bit shifting/inlining patches improve things? http://thread.gmane.org/gmane.comp.lang.haskell.cafe/16849/focus=16849 I'm thinking that users shouldn't need to resort to manual -funfolding-use-threshhold settings? -- Don