Use correct precision to compare

[ktf]

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[ktf]

@wiechula I am pretty sure the current test is only working for the case the results are bit to bit equal. The epsilon is clearly too small for even one bit differences if the exponent is not 1.

I copied the equality from https://en.cppreference.com/w/cpp/types/numeric_limits/epsilon and with the new function the test works also on ARM, someone should crosscheck, though.