Andrew Pinski <[EMAIL PROTECTED]> writes: > On Jun 26, 2006, at 2:09 PM, Ian Lance Taylor wrote: > > > As far as I can see, it doesn't. > > You missed: > if (TARGET_MMX) > ix86_init_mmx_sse_builtins (); > > Which HJL should have also quoted.
I didn't miss it, I was just ambiguous. H.J. asked "Why does __float80 have to depend on -mmmx/-msse?" and I answered "it doesn't," meaning that __float80 doesn't have to depend on -mmmx/-msse. > > On the other hand, as far as I can > > see, __float80 is undocumented and unused for the i386. Why does it > > exist? > > Jan added it with __float128 also: > 2003-10-30 Jan Hubicka <[EMAIL PROTECTED]> > > (ix86_init_mmx_sse_builtins): Add __float80, __float128. > > I think it was added for x86_64 ABI support which defines them > > http://gcc.gnu.org/ml/gcc-patches/2003-10/msg02473.html Are you saying that the x86_64 ABI calls for __float80 to be defined? I can't find any reference to __float80 which is not related to gcc or ia64. In any case that does not give any explanation for why it should only be defined for MMX or SSE. I don't object to defining __float80 for i386. I agree with H.J. that if we define it, we should define it unconditionally. And I also say that if we define it, we should document it, or at least find some other document which mentions it. Ian
