Re: New loop unroller broken?

[Dale Johannesen <dalej at apple dot com>]

On Jan 22, 2004, at 10:53 AM, Andrew Pinski wrote:
> On Jan 22, 2004, at 10:47, Ulrich Weigand wrote:
>
> > void test(float *data, float d)
> > {
> >    int i;
> >    for (i = 0; i < 8; i++)
> >       data[i] = d;
> > }
> >
> > because of
> > 'Unable to prove that the loop iterates constant times'
> > which strikes me as somewhat odd.
> >
> > Is this the same on other platforms?  Any ideas how to fix
> > this (or how to debug it)?
>
> Yes I see this also on PPC because of the doloop optimizations.
> I do know that this was fixed on rtlopt branch though but I do not
> when it is going to be fixed.

Yes, on mainline the problem goes away with -fno-branch-count-reg.
That isn't enough on tree-ssa, however, that branch has another problem
(but it may be that the way to address that is wait for lno rather than 
worry about the
rtl loop optimizer).