Digital processor with bit mask for counting registers for fast

Details Digital processor with bit mask for counting registers for fast Digital processor with bit mask for counting registers for fast

1990-06-21

1994-06-14

Coleman, Eric

Boots, shoes, and leggings

3642597, 364260, 3642628, 3649427, 364DIG1, G06F 1200

Patent

active

053218230

ABSTRACT:
A high-performance, pipelined CPU in which an improved method is used for saving registers in memory upon the occurrence of a procedure CALL or RETURN. The registers which need to be saved are defined by a bit-mask, and the number of bits is counted by a hardwired circuit, in each machine cycle, producing an output in the form of an offset from a stack pointer which represents the highest memory location needed to save the registers being used. Then a memory probe can be done to see if this location is writable. Thus, in one microinstruction cycle, the count is made and the memory probe can begin.

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