On Wed, Dec 14, 2016 at 11:01:47AM +0100, Dominik Vogt wrote:
> gcc/ChangeLog-change_zero_ext-2
>
> * combine.c (change_zero_ext): Skip generation of redundant AND.
Applied. Thanks!
-Andreas-
On Thu, Dec 15, 2016 at 09:55:52AM +0100, Dominik Vogt wrote:
> > > Bootstrapped and regression tested on s390x and s390. (Targets
> > > with risbg-like instructions (Power, others?) may need some
> > > tuning.)
> >
> > But, it is also possible I missed some. So please wait until I have
> > test
On Wed, Dec 14, 2016 at 01:32:48PM -0600, Segher Boessenkool wrote:
> On Wed, Dec 14, 2016 at 11:01:47AM +0100, Dominik Vogt wrote:
> > This is another micro-optimisation in change_zero_ext. If an
> >
> > (and (lshiftrt ... (N)) (M))
> >
> > generated by change_zero_ext is equivalent to just
>
On Wed, Dec 14, 2016 at 11:01:47AM +0100, Dominik Vogt wrote:
> This is another micro-optimisation in change_zero_ext. If an
>
> (and (lshiftrt ... (N)) (M))
>
> generated by change_zero_ext is equivalent to just
>
> (lshiftrt ... (N))
>
> (because the AND constant selects the N rightmost
