On Thu, Aug 13, 2015 at 03:52:00PM +0200, Markus Trippelsdorf wrote:
> On 2015.08.13 at 15:40 +0200, Marek Polacek wrote:
> > On Thu, Aug 13, 2015 at 01:11:53PM +0200, Richard Biener wrote:
> > > Rather ubsan should not complain about implementation defined behavior (or
> > > should separate those cases out with a different switch compared to
> > > undefined
> > > behavior).
> >
> > I think ubsan doesn't complain about implementation-defined behavior. It
> > seems
> > to me that in this thread it only (rightfully) complained about
> > left-shifting of
> > negative value.
>
> There are two issues in the same location:
>
> 1) gcc/hwint.h:250:19: runtime error: left shift of 8589934588 by 32
> places cannot be represented in type 'long int'
>
> 2) left-shifting of negative values
I see, both are UB.
Marek
