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Re: Enable SSA at -O0
On Wed, 23 Jul 2008, Robert Dewar wrote:
> Richard Guenther wrote:
>
> > Uh, well. We are going to merge 5 branches, SSA at -O0 is a minor
> > thing. I don't see why you are so concerned about its effects?
> > Also most of the benefits, like enabling some extra warnings at -O0,
> > consistent asm constraint processing, getting rid of unneccessary
> > code can be done in short time.
>
> My biggest concern is that this may degrade debugging. We have
> done quite a number on -O1 debuggability, and I am quite concerned
> about this issue. if we can really be sure that there is zero or
> positive impact on debugging and no other negatives, I have no
> objection.
How can we be "really sure"? Honza has done more than what is
possible in an automated way (running the gdb testsuite). Do
you at AdaCore by any chance have a better automated testsuite
for testing debugging stuff?
Richard.