------- Comment #72 from charlet at adacore dot com 2009-11-17 15:50 -------
Subject: Re: VRP fails to eliminate range
checks in Ada code
> > Is there anyway for the optimizers to get at this range information still?
> > Or was range information removed because it is essentially impossible to use
> > it correctly (if so this bug report should be closed as unfixable)?
>
> It was removed because it was impossible to use it correctly. The "fix"
> is to derive range information from existing range checks, possibly
> inter-procedurally.
Right, as soon as you have one range check, the compiler can make more
precise assumptions/conclusions about the actual range.
Arno
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30911
