[Q:] Implementation of global register variables

[Fermin Reig]

Hi,

A straightforward way of implementing global register variables is by
removing all registers that appear in global declarations from the
pool of registers available to the allocator. Can someone confirm if
this is how gcc does it? If not, a quick explanation will be
appreciated too.

(I've searched the list archives but could not find anything about the
implementation)

Thanks,
Fermin