Should GHC default to -O1 ?

David Fox ddssff at
Tue Nov 8 16:11:21 CET 2011

On Tue, Nov 8, 2011 at 6:31 AM, Daniel Fischer
< at> wrote:
> On the haskell-cafe as well as the beginners mailing lists, there
> frequently (for some value of frequent) are posts where the author inquires
> about a badly performing programme, in the form of stack overflows, space
> leaks or slowness.
> Often this is because they compiled their programme without optimisations,
> simply recompiling with -O or -O2 yields a decently performing programme.
> So I wonder, should ghc compile with -O1 by default?
> What would be the downsides?

I think this is an excellent idea.  Even better -O2.

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