Re: New loop unroller broken?

[Andrew Pinski <pinskia at physics dot uc dot edu>]

On Jan 22, 2004, at 10:47, Ulrich Weigand wrote:

> Hello,
>
> the new loop unroller doesn't unroll the following trivial loop
> on s390 (with -O2 -funroll-loops):
>
> 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.

Zdenek do you know where the problem is and how to fix it for 3.4 and 
3.5?


Thanks,
Andrew Pinski