PowerPC64 long double

[Alan Modra]

On Mon, Feb 21, 2005 at 05:49:43PM -0800, Ulrich Drepper wrote:
> Alan Modra wrote:
> >Needed for compiling with -mlong-double-128 on powerpc64-linux
> 
> Is this the only change needed?

Probably not.  This particular change merely fixes an obvious
compile-time error.  Steve can no doubt answer better as to how much
long double support is missing.

Steve/Dwayne, I'd like to enable -mlong-double-128 by default for
powerpc64-linux in gcc-4.0.  Whether we do this depends on the state
of glibc long double support for powerpc64-linux.  It would be
particularly nice if glibc could support both 64-bit and 128-bit
long double, for example by defining inline math functions that select
between the double or long double version depending on the size of
long double.  I guess this opens up a can of worms regarding backward
compatibility, which would need some versioning tricks to solve.  ie.
old code using 64-bit long doubles will reference fabsl@@some_version
and expect fabsl@@some_version to continue to be 64-bit.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre