soft-fp: make extensions quiet signaling NaNs (bug 16041)

[David Miller]

From: David Miller <davem@davemloft.net>
Date: Thu, 17 Oct 2013 00:45:21 -0400 (EDT)

> From: "Joseph S. Myers" <joseph@codesourcery.com>
> Date: Wed, 16 Oct 2013 22:03:37 +0000
> 
>> This patch fixes bug 16041, soft-fp extensions of signaling NaNs to a
>> wider floating-point type producing another signaling NaN when they
>> should produce a quiet NaN.
>> 
>> Tested for powerpc-nofpu.  David, this should fix the problem you
>> reported for SPARC (the relevant test in math/basic-test.c is disabled
>> for powerpc because of issues with conversions to/from long double).
> 
> Thanks, testing this now Joseph.

The fix is confirmed, please commit this Joseph.

Thanks again!