On Thu, Nov 08, 2007 at 07:57:23PM +0100, Thomas Schilling wrote:
$ ghc --make -O2 ghc-bench.hs
and got:
$ time ./ghc-bench 2.0e7
real 0m0.714s user 0m0.576s sys 0m0.132s
$ time ./ghcbC 20000000.000000
real 0m0.305s user 0m0.164s sys 0m0.132s
This is on a first-gen Macbook running Ubuntu. 1GB RAM. 1.83Ghz Core Duo
$ ghc --version The Glorious Glasgow Haskell Compilation System, version 6.8.0.20071019
$ gcc --version gcc (GCC) 4.1.2 (Ubuntu 4.1.2-0ubuntu4) Copyright (C) 2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe $ gcc -O3 ghc-bench.c -o ghcbC ghc-bench.c: In function ‘main’: ghc-bench.c:16: warning: incompatible implicit declaration of built-in function ‘printf’
-O3 is worse than -O0, DO NOT USE IT. I reported the bug several months ago. In the meantime, use -O2. (there are no high optimizations, it's just that the option parser misparses -O3) Stefan