LIMITING SPECULATIVE INSTRUCTION FETCHING IN A PROCESSOR

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United States of America Patent

APP PUB NO 20110179254A1
SERIAL NO

12688633

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The described embodiments relate to a processor that speculatively executes instructions. During operation, the processor often executes instructions in a speculative-execution mode. Upon detecting an impending pipe-clearing event while executing instructions in the speculative-execution mode, the processor stalls an instruction fetch unit to prevent the instruction fetch unit from fetching instructions. In some embodiments, the processor stalls the instruction fetch unit until a condition that originally caused the processor to operate in the speculative-execution mode is resolved. In alternative embodiments, the processor maintains the stall of the instruction fetch unit until the pipe-clearing event has been completed (i.e., has been handled in the processor).

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Patent Owner(s)

Patent OwnerAddress
SUN MICROSYSTEMS INC4150 NETWORK CIRCLE SANTA CLARA CA 95054

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chaudhry, Shailender San Francisco, US 148 2868
Karlsson, Martin R San Francisco, US 8 286
Yip, Sherman H San Francisco, US 25 659

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