[Haskell-cafe] Very fast loops. Now!

Rafael Almeida almeidaraf at gmail.com
Sat Feb 10 13:11:31 EST 2007

On 2/10/07, Felipe Almeida Lessa <felipe.lessa at gmail.com> wrote:
> Under gcc (GCC) 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5),
> the following asm code is generated for part of the main function:
> mov         dword ptr [esp+4], 0aaaaaaabh
> mov         dword ptr [esp+8], 400aaaaah
> mov         dword ptr [esp], data_804858c
> call        wrapper_8049688_80482b4
> where data_804858c is "%f\n" and wrapper_8049688_80482b4 is printf.
> Needless to say that the other argument is exactly the double
> 3.3333333333333335. In the OP's words, "newer gcc's will statically
> compute that loop".

What I found impressive was the time taken by the haskell version,
14s, much more than the haskell and C version of Donald's e-mail.

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