On Fri, 2005-03-18 at 18:25 +0100, Zdenek Dvorak wrote:
> Hello,
>
> > Which appears to walk down the array and try and choose better IV sets.
> > Since it walks down the IV array, which is in SSA_NAME_VERSION order.
> > Thus two loops which are equivalent in all ways except that they use
> > diff
Hello,
> Which appears to walk down the array and try and choose better IV sets.
> Since it walks down the IV array, which is in SSA_NAME_VERSION order.
> Thus two loops which are equivalent in all ways except that they use
> different SSA_NAME_VERSIONs can get different IV sets.
>
> Anyway, the
I'm sitting here analyzing a regression with some pending jump threading
changes and I've stumbled upon this quirk in IV opts which, if nothing
else, makes it very difficult to evaluate the jump threading changes.
Specifically, the set of IVs selected for a loop changes when the
version #s of ob
