Millimode capable computer system providing global branch histor

Electrical computers and digital processing systems: processing – Processing control – Processing sequence control

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712240, 712227, G06F 922

Patent

active

061254444

ABSTRACT:
A millimode capable computer system provides control to millicode to allow the BHT operations to continue except when the these special situations occur that require control of instruction fetch operations must be provided and the BHT can be turned off for some sections of code execution, but not disabled for all. A single free running BHT functions for both a normal mode and a millimode for the central processor which can execute in millimode with a branch history table directing instruction fetch for which both a global BHT disable and millicode disables exist. Hit detection logic receives input from the global BHT disable, as well as from an initialized control register bit and a processor control register bit to select the correct set target information and generate a "branch history table hit detected" control signal.

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patent: 5345567 (1994-09-01), Hayden et al.
patent: 5634119 (1997-05-01), Emma et al.
patent: 5694617 (1997-12-01), Webb et al.

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