[Bug target/59405] Incorrect FP<->MMX transition during call/ret

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59405

--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Yukhin Kirill from comment #3)
> (In reply to Uroš Bizjak from comment #1)
> > There is no testcase attached, but you need to *manually* insert _mm_empty
> > (== emms) to switch from MMX to x87 state.
> > 
> > The compiler does not automatically insert emms for you.
> 
> Well, then problem is different, test as simple as empty call.
> I doubt we should emit wrong code here.

You need:

float
foo32x2_be (float32x2_t x)
{
  __builtin_ia32_emms();
  return x[1];
}

This is documented somewhere in Intel's ISA manual, so the testcase is probably
invalid.