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Re: -funsafe-loop-optimizations


Hello,

> David Edelsohn wrote:
> 
> >	While we discuss whether this should be the default or enabled at
> >any optimization level, can we agree that users should be able to assert
> >with a commandline option that they want less strict induction variable
> >semantics?  I hope that we can move forward with an option to address
> >these performance regressions and allow users to request this optimzation
> >when they *do* want it, along the lines of the draft patch.
> 
> I would certainly agree.  I think the first thing to do is to get a 
> patch that implements the semantics we want, in the aggressive mode; 
> then, we can decide whether we want it to be the default at some 
> optimization level or not.

the patch (not final version, but usable for testing) is already
available.

http://gcc.gnu.org/ml/gcc/2005-01/msg00059.html

Zdenek


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