Fix PR44281 (bad RA with global regs)

[Richard Biener]

On Mon, Feb 29, 2016 at 2:38 PM, Bernd Schmidt <bschmidt@redhat.com> wrote:
> On 02/27/2016 08:12 PM, Richard Biener wrote:
>>
>>
>>
>> Am Freitag, 26. Februar 2016 schrieb Jeff Law :
>>
>>     The other case that came to mind was signal handlers.  What happens
>>     if we're using the global register as a scratch, we hit a memory
>>     reference that faults and inside the signal handler the original
>>     code expects to be able to use the global register the user set up?
>>
>>     If that's a valid use scenario, then there's probably all kinds of
>>     DF stuff that we'd need to expose.
>>
>> I'd say that's a valid assumption.  Though maybe we want to be able to
>> change semantics with a flag here.
>
>
> A flag seems like overkill, I don't think people are likely to enable that
> ever.
>
> So what's the consensus here, closed wontfix?

I think so, and maybe update documentation to reflect the discussion.

Richard.

>
> Bernd
>
>