Can C default to float? Are there float regs?

[Eugene D. Brooks III]

In reply to the comment concerning the difficulty of doing double
register vars right with pcc.  FOO on this!  This problem is no
different than getting longs done right on the PDP 11.  It has been
done at Caltech for one place and that compiler, which does single arithmetic
in single and allocates both single and double floats in registers properly
has been in use for many years.  Like any compiler modification it has
to be done right but it is not that difficult.