Question: What is the speedup achieved by changing the processor from 4-issue to 8-issue? Assume that the 8-issue and the 4-issue processor differ only in the

What is the speedup achieved by changing the processor from 4-issue to 8-issue? Assume that the 8-issue and the 4-issue processor differ only in the number of instructions per cycle, and are otherwise identical (pipeline depth, branch resolution stage, etc.).

The remaining problems in this exercise assume the following pipeline depth and that the branch outcome is determined in the following pipeline stage (counting from stage 1): a. b. Pipeline Depth 15 30 Branch Outcome Known in Stage 12 20

a. b. Pipeline Depth 15 30 Branch Outcome Known in Stage 12 20

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The speedup achieved by changing the processor from a 4issue to an 8issue processor can be calculated using Amdahls Law Amdahls Law provides a formula to estimate the speedup of a system when only a portion of it is improved The formula is given by Speedup 111 Where P is the fraction of the computation that benefits from the improvement Factor is the speedup achieved in the improved portion In this case the improvement is in the number of instructions issued per cycle issue width The fraction of computation that benefits P is determined by the issue width improvement and the factor Factor is the increase in the number of instructions issued per cycle Lets calculate ... View full answer

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