Hi! On Fri, Jul 18, 2008 at 3:54 PM, Chaddaï Fouché <[EMAIL PROTECTED]> wrote: >> So that I can easily change the type everywhere. But it would be much >> nicer to write: >> >> data Quaternion a = Q !a !a !a !a deriving (Eq,Show) >> >> Only the performance of Num instance functions of Quaternion is then >> quite worse. > > You can probably use a specialization pragma to get around that.
But why is this not automatic? If I use Quaternions of only one type in the whole program then why it does not make specialized version for it? At least with -O2 switch. Why exactly are polymorphic functions slower? Is not this just a question of type checking (and of writing portable/reusable code)? But later on in a compiler process we do know of which type exactly is the called function - so we could use a function as it would be written only for that type. Something what specialization is doing as I see. I thought this is always done. Mitar
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