[PATCH 1/6] ldbl-128: Simplify fma usage

[Joseph Myers]

On Tue, 16 Aug 2016, Paul E. Murphy wrote:

> Several ldbl-128 files share identical code which does
> not ammend itself to the macro renaming necessary to
> support building with another type.
> 
> This moves the duplicated function mul_split into its
> own header, and refactors the fma usage into a single
> selection macro.

This seems like something that if done for one type, should be done for 
all types together (optionally also removing the "compiler before GCC 4.6" 
cases as no longer relevant to building glibc).

-- 
Joseph S. Myers
joseph@codesourcery.com