发明名称 |
Digital processor with bit mask for counting registers for fast register saves |
摘要 |
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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申请公布号 |
US5321823(A) |
申请公布日期 |
1994.06.14 |
申请号 |
US19900542636 |
申请日期 |
1990.06.21 |
申请人 |
DIGITAL EQUIPMENT CORPORATION |
发明人 |
GRUNDMANN, WILLIAM J.;UHLER, GEORGE M.;CALCAGNI, RICHARD E. |
分类号 |
G06F9/46;(IPC1-7):G06F12/00 |
主分类号 |
G06F9/46 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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