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The exponent computation in the function
precin Preloaded relies on a non-standard compiler extension:"It's undefined behavior to read from the member of the union that wasn't most recently written. Many compilers implement, as a non-standard language extension, the ability to read inactive members of a union." (https://en.cppreference.com/w/cpp/language/union).
I recommend to compute the exponent with the
frexpfunction.