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ela
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I'm studying for an exam on Advanced Computer Architecture and in an exam question the question above is asked.

I know that branch prediction is crucial in superscalar processors in order to exploit ILP as much as possible, but I was wondering what could be the precise reason why superscalar processors use dynamic branch prediction instead of static one.

Update:

Hi again, as the two comments below suggested, I tried to think about it and thought that in case of a misprediction a processor using branch predictor has to flush the pipeline from the incorrect instructions issued because of the prediction.

So, for a superscalar processor issuing multiple instructions at the same time, the penalty would be much higher, but I'm still not sure this is the real point...

Any other help?

I'm studying for an exam on Advanced Computer Architecture and in an exam question the question above is asked.

I know that branch prediction is crucial in superscalar processors in order to exploit ILP as much as possible, but I was wondering what could be the precise reason why superscalar processors use dynamic branch prediction instead of static one.

I'm studying for an exam on Advanced Computer Architecture and in an exam question the question above is asked.

I know that branch prediction is crucial in superscalar processors in order to exploit ILP as much as possible, but I was wondering what could be the precise reason why superscalar processors use dynamic branch prediction instead of static one.

Update:

Hi again, as the two comments below suggested, I tried to think about it and thought that in case of a misprediction a processor using branch predictor has to flush the pipeline from the incorrect instructions issued because of the prediction.

So, for a superscalar processor issuing multiple instructions at the same time, the penalty would be much higher, but I'm still not sure this is the real point...

Any other help?

Source Link
ela
ela
  • 315
  • 2
  • 7

Why superscalar processors use dynamic branch prediction

I'm studying for an exam on Advanced Computer Architecture and in an exam question the question above is asked.

I know that branch prediction is crucial in superscalar processors in order to exploit ILP as much as possible, but I was wondering what could be the precise reason why superscalar processors use dynamic branch prediction instead of static one.