C++ : Why does this code behave differently if optimizing (-O2, -O3) is used?

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C++ : Why does this code behave differently if optimizing (-O2, -O3) is used?
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C++ : Why does this code behave differently if optimizing (-O2, -O3) is used?
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does if behave code Why -O3) C++ this (-O2, used? differently optimizing is :



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