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Re: Optimizing GCC
- From: dewar at gnat dot com (Robert Dewar)
- To: cheapisp at sensewave dot com, pop at gauvain dot u-strasbg dot fr
- Cc: gcc at gcc dot gnu dot org
- Date: Tue, 4 Mar 2003 15:29:50 -0500 (EST)
- Subject: Re: Optimizing GCC
> In part this is false: it depends only on whether the optimization flag
> you add to build gcc is safe or not.
>
> If the optimization doesn't introduce junks, in other words if the
> optimization is valid, then the optimized GCC is semantically equivalent
> to the non-optimized GCC. Thus you'll get the same output for the same
> input on both versions of GCC.
>
> Otherwise it is an error in the optimization you used to optimize GCC.
Or there is a bug in the GCC code which only shows up in the optimized context ...