PATCH: Enable TFmode for SSE2

[Joseph S. Myers]

On Fri, 27 Jun 2008, H.J. Lu wrote:

> Last time when I tried, soft-fp didn't support __float128 for ia32
> since it needs TImode. Has it been changed? In any case, we
> are planning to provide complete run-time __float128 support for
> both ia32 and x86-64. Our implementation will be optimized for
> x86 and may not use soft-fp. But I need to enable __float128 first.

If you do add a new x86-specific __float128 runtime, may I strongly 
encourage at this point that it interoperate with the hardware exceptions 
and rounding modes as soft-fp does?  Systems where some floating-point 
types work with exceptions and rounding modes and others don't do not fit 
well with the ISO C model and can be troublesome.

-- 
Joseph S. Myers
joseph@codesourcery.com