PR79286, ira combine_and_move_insns in loops

[Jeff Law]

On 02/23/2017 02:52 AM, Alan Modra wrote:
> On Thu, Feb 23, 2017 at 12:46:17AM -0700, Jeff Law wrote:
>> And thus we keep the equivalence.  Ultimately may_trap_p considers a PIC
>> memory reference as non-trapping.
>
> Which is obviously a bug, because this access is segfaulting..
> Not that I want to poke at the bug.  :)
They're explicitly called out as not causing faults.  I'm not sure I 
want to revisit that history right now, whatever it is,  It's clearly 
wrong IMHO though.

Jeff