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Processing Time of Multiplicatoin and Addition

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Ali Abdollahi
Ali Abdollahi 2012-1-12
We know that the processing of a multiplication is by far greater than that of addition.
I did this test.
For testing the requeired clock cycles for an addition I wrote the following program.
clc
clear
N = 10^8;
tic for i=1:N j=i+i; end processing_time = toc;
av_time = processing_time/N;
clk_period = 1/(3.4*10^9); % computer clock period time = 1/f where f = 3.4 GHz
av_time2clk_period = av_time/clk_period
Then I changed j= i+i ; to j = i*i to see how many cycles a multiplication takes time. Amazingly both addition and multiplication result in the same processing time. Why?

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Bill Winter
Bill Winter 2012-1-12

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