[RS6000] reload_vsx_from_gprsf splitter

[Alan Modra]

On Mon, Feb 15, 2016 at 06:42:35AM -0800, David Edelsohn wrote:
> Is there still an issue with the constraints used for movdi_internal64?

Yes and no.  No because we shouldn't be attempting DI moves between vsx
regs and gprs.  Yes because we ought to allow DImode in vsx regs, but
fixing that is likely not trivial.

Do we want to backport the PR68973 fixes to gcc-5 and gcc-4.9?  We are
exposed to the reload_vsx_from_gprsf bug there, I think, but TFmode
won't be IEEE.

-- 
Alan Modra
Australia Development Lab, IBM