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Re: [ast-optimizer-branch]: SSA-CCP on tree-ssa


On Thu, 06 Dec 2001, Daniel Berlin wrote:

> > Even if it means duplicating some code, I'm trying to
> > figure out which option is easier to maintain in the future.
> To be honest, I think it's easier to maintain ssa-ccp with function 
> pointers.
> Besides the only real difference being in the evaluation function, and 
> walking the SSA, it would also enable us to vary the optimization 
> performed based on -O level or something, or combine it with other 
> optimizations just by plugging in a seperate function.
> 
OK then.  Thanks for the clarification.  If it will make our life
easier, I'm all for it.

> > You don't mention bootstrap/regression test results. Particulary,
> > using -ftree-ssa.  On the branch we should make -O2 trigger the
> > tree SSA transformations.
> Bootstraps okay on powerpc-linux-gnu.
>
With -ftree-ssa in BOOT_CFLAGS?

> Never got to checking test results.
> 
We need to make sure it doesn't introduce regressions.  Since
it's going into the ast-branch that's not such a high priority
right now.

Are you willing to keep maintaing it regularly?  I'd like to
merge the branch into the trunk for the 3.2 release.  If not, I
can take over as I'll be doing lots of maintenance on the branch
over the next few weeks.

Thanks.  Diego.


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