Electrical computers and digital processing systems: processing – Processing control – Branching
Patent
1997-10-28
2000-09-12
Ellis, Richard L.
Electrical computers and digital processing systems: processing
Processing control
Branching
712233, 712234, 712236, G06F 944
Patent
active
06119221&
ABSTRACT:
The present invention intends to provide an instruction prefetching apparatus capable of reducing a delay caused by branch prediction error by prefetching instruction based on a condition of a conditional branch instruction if the condition is already determined at the prefetching of the branch instruction. In the apparatus, a first decoding unit judges whether or not a processed instruction is a conditional branch instruction or not and whether or not the instruction is a condition generate instruction which determines branch condition. A condition determination signal generating means compares an address of a condition generate instruction with the content of a program counter to judge whether the condition is already determined or not, and according to the judgment, outputs a condition determination signal to a condition determination judging unit. In response to the signal input, the condition determination judging unit outputs prefetch address information for generating address to a prefetch address generating unit, using a condition code.
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Tanaka Tetsuya
Zaiki Koji
Ellis Richard L.
Matsushita Electric - Industrial Co., Ltd.
Monestime Mackly
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