[Bug target/81709] __attribute__((interrupt)) should handle SSE registers

[anatol.pomozov at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81709

--- Comment #6 from Anatol <anatol.pomozov at gmail dot com> ---
> I don't believe compiler needs to do all that.

I might miss something, could you please share why?

The check for FXSAVE can be a compile time: if compiled for Pentium II tune or
later then use FXSAVE otherwise use FSAVE.

if (tune >= 'pentium II')
  FXSAVE
else
  FSAVE
  ... save whatever FSAVE did not save ...
end