[Haskell-cafe] Re: MD5 performance optimizations

Don Stewart dons at galois.com
Tue May 20 17:02:49 EDT 2008

> Hello Andrew,
> Wednesday, May 21, 2008, 12:09:39 AM, you wrote:
> > Right, OK - so strict evaluation, but some bitpattern in RAM.
> yes. in particular this allows to designate fields that should de
> initialized:
> data A = A {a :: Int, b :: !Int}
> main = print A{}
> >> it is not enabled by default, because for *non-primitive* datatypes
> >> such as B below automatic unboxing of strict fields of this type may
> >> decrease sharing and thus memory/performance.
> > Yeah, I can imagine...
> sometime i've seriously optimized my program by removing this switch
> and adding manual unboxing directives to the sources. it will be great
> if ghc will catch jhc here

Would you like to file a feature request?


Particularly if you have an example where JHC has done a better job
optimising some simple example. So far I've seen no ticke

Unless tickets are opened, progress will not be made.

-- Don

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