[COMMITTED] tilegx: enable wordsize-64 support for ieee745 dbl-64.

[Andrew Pinski]

On Wed, Dec 24, 2014 at 9:10 AM, Chris Metcalf <cmetcalf@ezchip.com> wrote:
> On 12/23/2014 5:39 PM, H.J. Lu wrote:
>>
>> You can provide a safe default and let x32 override it.
>
>
> I think it's conventional now to require that platforms are explicit
> about #defines, and use #if with -Wundef.  It seems to make good sense
> in this case, since it's really not clear what the right default for
> any given platform is.
>
> And since there are currently just two platforms that use wordsize-64
> and are !_LP64 (x32 and tilegx32), it feels pretty reasonable to be
> explicit for both.  The AArch64 guys will need to set the right default
> for their ILP32 mode; I'm not even sure what the right answer is for them.

AARCH64:ILP32 is fine with having the upper bits being undefined when
dealing with passing and return values.

Thanks,
Andrew

>
>
> --
> Chris Metcalf, EZChip Semiconductor
> http://www.ezchip.com
>