Pentium superscalar capability: Evaluate the statement: “The Intel Pentium processor can dispatch and execute two instructions simultaneously under suitable conditions.”

Difficulty: Easy

Correct Answer: Correct

Explanation:


Introduction / Context:
The early to mid-1990s introduced superscalar execution to mainstream desktop CPUs. The Pentium (P5) microarchitecture is notable for its dual integer pipelines (U and V), enabling limited dual-issue under certain pairing rules. This question tests understanding of that capability.



Given Data / Assumptions:

  • Pentium has two integer pipelines named U and V.
  • Dual-issue occurs only when instructions are pairable and data/structural hazards are absent.
  • Floating-point and certain complex instructions may serialize or restrict pairing.


Concept / Approach:
To validate the claim, recall that superscalar designs can fetch, decode, and (sometimes) execute more than one instruction per cycle. The Pentium is a dual-pipeline design that can, in favorable cases, retire two integer instructions per cycle.



Step-by-Step Solution:

Identify the architectural feature: dual pipelines (U/V).Apply pairing rules: simple integer ops can pair; dependencies or specific instruction types may prevent pairing.Conclude: The architecture can execute two instructions at once when constraints are met.Therefore, the statement is “Correct.”


Verification / Alternative check:
Vendor documentation and optimization manuals describe pairing rules, scheduling, and pipeline hazards, all consistent with dual-issue capability.



Why Other Options Are Wrong:

Incorrect: Contradicts well-documented dual-pipeline design.Only in protected mode: Execution width is architectural, not strictly a CPU mode property.Cannot be determined without cache details: Caches affect performance, not the fundamental dual-issue capability.


Common Pitfalls:
Assuming two-at-once always happens; ignoring dependencies and pairing restrictions; confusing decode bandwidth with execution.


Final Answer:
Correct

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