Measured, allocation of speculative branch instructions to processor execution units

Abstract

A method and system for branch dispatching of instructions in a data processor. A processor having one or more buffers for storing instructions and one or more execution units for executing instructions is utilized. Each unit has a corresponding queue which holds instructions pending execution. First, a threshold level (selected maximum number of instructions in the instruction queue) is set. The current utilization measure for one or more execution units in the data processing system is determined. The current utilization measure is compared to the predetermined threshold value; and a speculative branch instruction is dispatched to a selected execution unit when the current utilization measure is less than the predetermined threshold value.

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