Does unrolling prevents doloop optimizations?

[Ayal Zaks]

Zdenek Dvorak <rakdver@kam.mff.cuni.cz> wrote on 30/06/2007 10:52:32:

> Hello,
>
> > It doesn't seem that the number of iterations analysis from loop-iv.c
deals
> > with EQ closing branches.
>
> loop-iv works just fine for EQ closing branches.
>

Thanks for the clarification (I didn't see EQ in iv_number_of_iterations's
switch (cond)). In that case, sms should definitely try to use it.

Ayal.


> Zdenek
>
> > One option is for sms to use
> > doloop_condition_get/loop-iv analysis in their current form, and if
failed
> > check (on our own) for reversed doloop patterns. Another is to try and
> > reverse the closing branch before calling doloop_condition_get/loop-iv
> > analysis; any suitable branch reversal facility available?
> >
> > Ayal.