[Haskell-cafe] GHC optimisations

[Andrew Coppin]

Simon Peyton-Jones wrote:
> GHC does some constant folding, but little by way of strength reduction, or using shifts instead of multiplication.  It's pretty easy to add more: it's all done in a single module.  Look at primOpRules in the module PrelRules.
>
> Patches welcome!  But please also supply test-suite tests that check the correctness of the rules.
>   

So... you mean it's source-level transformation rules? (Rather than 
wired into the compiler itself somewhere.)