Question

What is the general prediction strategy for conditional branches?

a.

Backward branches that jump to an earlier instruction are always expected to be taken, while forward branches (typically used in if statements) are assumed to not be taken.

b.

Forward branches that jump to a later instruction are always expected to be taken, while backward branches (typically used in loops) are assumed to not be taken.

c.

Both forward and backward branches are always expected to be taken.

d.

The processor always waits for the outcome of a conditional branch before proceeding with the next instruction.

Posted under Reverse Engineering

Answer: (a).Backward branches that jump to an earlier instruction are always expected to be taken, while forward branches (typically used in if statements) are assumed to not be taken. Explanation:The general prediction strategy is that backward branches that jump to an earlier instruction are always expected to be taken because those are typically used in loops, where for every iteration there will be a jump, and the only time such branch is not taken is in the very last iteration. Forward branches (typically used in if statements) are assumed to not be taken.

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