Microarchitecture of the Pentium Pro Processor

Introduction

One of the Pentium® Pro mainframes primary goals was to significantly exceed the accomplishment

of the 100MHz Pentium® mainframe computer mend being manufactured on the same semiconductor process. utilize the same process as a volume return processor practically assured that the Pentium Pro processor would be manufacturable, but it meant that Intel had to focus on an improved microarchitecture for ALL of the performance gains. This guided tour describes how multiple architectural techniques - almost turn out in mainframe computers, some proposed in academia and some we innovated ourselves - were carefully interwoven, modified, enhanced, tuned and implemented to baffle the Pentium Pro microprocessor. This unique combine of architectural features, which Intel describes as Dynamic Execution, enabled the first Pentium Pro processor silicon to exceed the original performance goal.

Building from an already mettlesome platform

The Pentium processor set an impressive performance standard with its pipelined,

superscalar microarchitecture. The Pentium processors pipelined effectuation uses five

stages to extract high throughput from the silicon - the Pentium Pro processor moves to a

decoupled, 12-stage, superpipelined implementation, occupation less work per pipestage for

more stages.



The Pentium Pro processor reduced its pipestage conviction by 33 percent, compared

with a Pentium processor, which means the Pentium Pro processor can have a 33% higher clock

speed than a Pentium processor and still be equally easy to produce from a semiconductor

manufacturing process (i.e., transistor speed) perspective.

The Pentium processors superscalar microarchitecture, with its ability to execute two

didacticss per clock, would be difficult to exceed without a new admission.

The new approach used by the Pentium Pro processor removes the constraint of linear

instruction sequencing mingled with the traditional fetch and execute phases, and opens up

a wide instruction window using an instruction pool. This approach allows the execute

phase of the Pentium Pro processor to...

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