Should -mfma/-mavx and -msse5/-msse4a mutually exclusive?

[H.J. Lu]

Hi,

We are looking into Intel FMA support in gcc. For

double
foo (double x, double y, double z)
{
  return x * y + z;
}

What should "-mfma -msse5" generate? Should -msse5  turn off -mfma and
vice versa?
Also I am not sure if "-mavx -msse5" or "-mavx -msse4a" make any senses. I think
-mavx should turn off -msse5/-msse4a and vice versa.

Thanks.

-- 
H.J.