utah rcsid 1.6 87/08/24 00:44:32: Added a PBUSY bit to mark the first
register in a pair in the 'busy' array. New code in usable() uses this bit
to identify sharable register pairs. Other code that

utah rcsid 1.6 87/08/24 00:44:32: Added a PBUSY bit to mark the first
register in a pair in the 'busy' array. New code in usable() uses this bit
to identify sharable register pairs. Other code that referred directly to
the contents of the array had to be modified slightly...

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add even register need for tahoe

Extended the test in usable() for operations that require register pairs.
Assignments of the form 'i *= d' require that the register temporary be
a register pair -- the lhs must be widened.

update from donn@utah-cs

remove duplicate definition of TBUSY

use common header file for C, Fortran, Pascal.

fix allocation of register pair for logop()'s.

changes for single precision floats; lint cleanups

merging f1 and c1

date and time created 84/03/14 15:21:07 by ralph