Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Patent
1997-10-17
1999-06-29
Treat, William M.
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
711213, G06F 938
Patent
active
059180455
ABSTRACT:
The data processor includes a CPU and an instruction prefetch buffer that prefetches an instruction executed by the CPU and stores it therein. The CPU contains a detection circuit for detecting whether or not a displacement from a branch instruction to a branch target instruction is a specific displacement on the basis of branch displacement information that the concerned branch instruction holds. The instruction prefetch buffer clears an instruction already prefetched when the detection circuit detects that the displacement is not the specific displacement and outputs a branch target instruction newly fetched to the CPU, and outputs a branch target instruction already prefetched to the CPU when the detection circuit detects that the displacement is the specific displacement. Thus, the date processor fetches a branch target instruction within a certain range from the instruction prefetch buffer at a high speed without adding the nullifying bit on the instruction code.
REFERENCES:
patent: 5367703 (1994-11-01), Levitan
patent: 5463737 (1995-10-01), Saitoh
patent: 5579493 (1996-11-01), Kiuchi et al.
patent: 5784604 (1998-07-01), Muhich et al.
"PA-RISC 1.1 Architecture and Instruction Set", Nov. 1990. pp. -2-8 -C-5.
Nakagawa Norio
Nakano Sadaki
Nishii Osamu
Tsunoda Takanobu
Hitachi , Ltd.
Treat William M.
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