SMT flush arbitration

Details SMT flush arbitration SMT flush arbitration

2007-03-20

2007-03-20

Chan, Eddie (Department: 2183)

Electrical computers and digital processing systems: processing

Dynamic instruction dependency checking, monitoring or...

C712S228000

Reexamination Certificate

active

10422026

ABSTRACT:
A methodology to process flushes in an SMT processor with a dynamically shared group completion table (GCT) and a Flush table comprises identification of incoming flush sources by thread. This uses the forward link array by flush source to determine the next instruction group following the group indicated by the flush source (for example, for mispredicts and load/store flush-next type flushes). Presentation of flush completion table entry numbers or instruction group identifiers (Gtags) to the flush table for computation of oldest flushed group tag corresponding to each thread. The flush selection cycle wherein the flush table outputs are compared against saved versions of all the flush Gtags presented to determine which flush source matches the oldest group output from the flush table. The flush source information is used with the selected oldest Gtag to determine the appropriate additional flushing action to take during the flush cycle.

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