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How to test
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(1) Edit the following line in Makefile
MCKDIR=$(HOME)/project/os/install
(2) make test
(3) Check if the first value, number of instructions retired,
shows around 3 million.
(4) Check if the second value, number of cycles taken,
shows around 3 million / instructions-per-cycle
(1 - 1.5, depends on the processor).