[PATCH, rs6000] Clean up powerpc __float128 tests for older hardware

[Segher Boessenkool]

Hi Bill,

On Tue, Jun 28, 2016 at 02:28:37PM -0500, Bill Schmidt wrote:
> On POWER7 and earlier hardware, -mvsx is not on by default, causing the new
> tests for __float128 builtins to fail.  This patch makes the dependency on VSX
> hardware explicit in the tests.
> 
> Tested on powerpc64-unknown-linux-gnu on POWER7.  Ok for trunk, and for later
> backport to 6.2?

Okay, thanks,


Segher