Re: [Haskell-cafe] benchmarking c/c++ and haskell

2010/9/13 Daniel Fischer :

On Monday 13 September 2010 11:50:14, Vo Minh Thu wrote:

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2010/9/13 David Virebayre :

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Does it help to compile with ghc --make -O2 -funbox-strict-fields  ??

No, it doesn't. Can I assume you don't have the problem I described?

Currently, GHC's native code generator is not too good at optimising loops. It might help if you compile via C,

ghc -O2 -fexcess-precision -fvia-C -optc-O3

On my box, that gives a > 2× speedup (unfortunately, that means it takes almost three times as long as the C version instead of > 6×).

With your options, the Haskell code is only 1.5x slower. But still...

If you have the llvm backend for GHC, that is supposedly better for such code.

... the post is from 2008. No LLVM goodness. So I thought GHC 6.12.1 (not the latest and greatest HEAD) would be enough. Thanks, Thu