On Mon, Sep 18, 2023 at 11:04:16AM +0200, Richard Biener via Gcc-patches wrote:
> > Note genmatch should warn (or error out) if this gets detected so I filed
> > PR 111446
> > which I will be looking into next week or the week after so we don't run
> > into
> > this issue again.
> >
> >
On Sun, Sep 17, 2023 at 11:41 PM Andrew Pinski via Gcc-patches
wrote:
>
> So it turns out VN can't handle any kind of recusion for match. In this
> case we have `b = a & -1` and we try to match a as being zero_one_valued_p
> and VN returns b as being the value and we just go into an infinite loop
So it turns out VN can't handle any kind of recusion for match. In this
case we have `b = a & -1` and we try to match a as being zero_one_valued_p
and VN returns b as being the value and we just go into an infinite loop at
this point.
OK? Bootstrapped and tested on x86_64-linux-gnu with no
