Re: -mfpmath=sse,387 is experimental ?

[Jan Hubicka <hubicka at ucw dot cz>]

> Timothy Madden wrote:
> > Hello
> > 
> > Is -mfpmath=both for i386 and x86-64 still experimental in gcc 4.3, as
> > the in the online manual page ?
> 
> Yes.  It might (*might*) be better in GCC 4.4 thanks to the new register
> allocator, but it's unlikely that the manual page will be changed before
> the release.

The fundamental problem here is that backend lies to compiler about the
fact that FP operation can not take one operand from SSE and other from
X87.  This is something I want to look into once I have more time.  With
new RA, perhaps we can drop all these fake constraints.

Honza
> 
> Paolo