Electrical computers and digital processing systems: memory – Address formation – Operand address generation
Patent
1998-02-20
2000-08-22
Yoo, Do Hyun
Electrical computers and digital processing systems: memory
Address formation
Operand address generation
711 5, 711220, 712211, 712218, G06F 1200
Patent
active
061087610
ABSTRACT:
A method and apparatus for reducing processor response time to selected transfer instructions in an multi-instruction processor. The response time is shortened by using a fast path to generate addresses for selected transfer instructions. In this fast path a base address, retained in a register from a previous instruction, is summed with an offset from the current instruction to obtain an absolute address for memory accessing. Before the fast path is entered determinations are made whether the instruction is a particular transfer instruction of a particular class and subclass, and whether the base address is different than the base address for the previous instruction. Even through the fast path is entered the usual absolute address generator path is also entered where the instruction is subjected to both high and low limit tests. If the high and low limit test determine a different base is to be used, the absolute address from the main address generator is used, instead of the absolute address from the LXJ fast path, and the system is restored to the conditions that would have prevailed if the fast path had not been entered.
REFERENCES:
patent: 3815101 (1974-06-01), Boss et al.
patent: 4096568 (1978-06-01), Bennet et al.
patent: 4354231 (1982-10-01), Carlsson et al.
patent: 4827406 (1989-05-01), Bischoff et al.
patent: 5155834 (1992-10-01), Ryan et al.
patent: 5379392 (1995-01-01), Alferness et al.
patent: 5414821 (1995-05-01), Nguyen et al.
patent: 5479627 (1995-12-01), Khalidi et al.
patent: 5504871 (1996-04-01), Takashi
patent: 5732404 (1998-03-01), Johnson et al.
patent: 5832292 (1998-11-01), Nguyen et al.
patent: 5867699 (1999-02-01), Kuslak et al.
Johnson David C.
Kuslak John S.
Lucas Gary J.
Johnson Charles A.
Starr Mark T.
Unisys Corporation
Vital Pierre M
Yoo Do Hyun
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