[Haskell-cafe] MD5 performance optimizations

Andrew Coppin andrewcoppin at btinternet.com
Tue May 20 16:05:51 EDT 2008

Don Stewart wrote:
> andrewcoppin:
>> While I'm here, can I just clarify *exactly* what -funbox-strict-fields 
>> actually does?
> If in doubt, ask the user's guide:
>     http://www.haskell.org/ghc/docs/latest/html/users_guide/pragmas.html#unpack-pragma

...so making a field strict causes it to be automatically forced when 
the constructor is forced, but doesn't actually unbox it? So there's 
still a level of indirection, and no register allocation?

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