[Bug rtl-optimization/85180] Infinite loop in RTL DSE optimizer

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85180

--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to romain.naour from comment #16)
> Hi,
> 
> gcc 7.3.0 is affected by this bug but only on microblaze architecture, see
> [1].
> Do you plan to backport this patch on gcc 7.x?
> It is safe to do so without take the risk to break something with other
> architecture or optimization level?
> 
> Best regards,
> Romain
> 
> [1] http://lists.busybox.net/pipermail/buildroot/2018-April/220156.html

The bug isn't a regression so technically it doesn't qualify.  OTOH it
looks reasonably safe to backport and the bug is annoying.  Jakub, would
you be ok with a backport?