Cycles Per Instruction – Why it matters

To compare how one version of a part of the code is running to another version, since this is a ratio, it is important to keep one of the values constant in order to understand if the optimization is working. If more cpu cycles are being used, but more instructions are being executed, then the ratio could be the same, but this measure will not show any improvement. The goal is to lower the CPI in certain parts of the code as well as the overall application.

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