[Haskell-cafe] sha1 implementation thats "only" 12 times slower then C

[Anatoly Yakovenko]

> Are you using -auto, or -auto-all? Because it makes a difference to
> the generated core, and the extent to which inlining takes place. I've
> noticed that -auto permits more inlining than -auto-all, so try -auto

-auto doesn't generate any meaningfull profiling info for me

> if you can. Also, follow the advice in the GHC manual, and only export
> the functions you need to. This will aid both the inliner and
> specialiser enormously.

cool, this actually helped quite a bit, now only 7.5 times slower :)


> As for reading core (well, actually simplifier output; core has less
> "punctuation"), these links might help:
>
> 4.16.3. How to read Core syntax
> http://www.haskell.org/ghc/docs/latest/html/users_guide/options-debugging.html#id3130643
>
> (and the Encoding module has the actual rules for the Unique names)
> http://darcs.haskell.org/ghc/compiler/utils/Encoding.hs
>
> 6.2. Faster: producing a program that runs quicker
> http://www.haskell.org/ghc/docs/latest/html/users_guide/faster.html
> (see "How do I find out a function's strictness?")

thanks for the tip, ill take a look at those.