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For the first test the operation was the addition of two volatile unsigned 16bit numbers, with the result also stored in a volatile unsigned 16bit number. The operation was performed 20 times within the timed period, with each operation using a different set or combination of variables. The test was then repeated with a multiplication in place of the addition, then again with a division in place of the multiplication.
Standard C code was used to declare the variables, and perform the additions/multiplications/divisions. Volatile variables were used to prevent the development tools optimizing the operation away, and to force the result to be written to RAM.
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