Virtual Labs

What is the main purpose of register renaming in a pipelined processor?

a: To reduce instruction latency Explanation

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b: To eliminate false data dependencies Explanation

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c: To improve cache locality Explanation

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d: To avoid branch mispredictions Explanation

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Which of the following is a false dependency that register renaming aims to eliminate?

a: Read After Write (RAW) Explanation

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b: Write After Read (WAR) Explanation

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c: Write After Write (WAW) Explanation

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d: Both WAR and WAW Explanation

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In scoreboarding without register renaming, which hazard cannot be resolved?

a: RAW Explanation

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b: Structural Explanation

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c: WAR Explanation

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d: Instruction cache misses Explanation

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What component dynamically maps architectural registers to physical registers?

a: Reorder buffer Explanation

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b: Scoreboard Explanation

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c: Rename table Explanation

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d: Reservation station Explanation

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In the context of register renaming, what does the term 'physical register' mean?

a: A register directly accessed by the programmer Explanation

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b: A memory-mapped hardware register Explanation

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c: A hardware register that temporarily holds data for renamed instructions Explanation

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d: A virtual placeholder used during static scheduling Explanation

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What enables out-of-order execution without violating program correctness when register renaming is used?

a: Scoreboarding Explanation

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b: Dependency tagging Explanation

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c: Logical register reuse Explanation

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d: Separation of name and storage Explanation

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Suppose two instructions write to the same architectural register. Without renaming, which hazard would occur?

a: RAW Explanation

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b: WAR Explanation

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c: WAW Explanation

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d: Structural Explanation

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How does register renaming eliminate WAR hazards?

a: By delaying the write of the later instruction Explanation

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b: By executing instructions in strict program order Explanation

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c: By allocating a new physical register to the writer Explanation

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d: By aborting dependent reads Explanation

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If physical registers are insufficient during register renaming, the processor must:

a: Stall the issue stage Explanation

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b: Use the same register name again Explanation

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c: Flush the pipeline Explanation

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d: Ignore renaming and execute in order Explanation

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