Improvements to BigDecimal(double, MathContext) constructor

John Platts john_platts at hotmail.com
Thu Jul 7 16:18:59 UTC 2016


Here is the current significand normalization loop below in the BigDecimal(double, MathContext) constructor:
        // Normalize
        while ((significand & 1) == 0) { // i.e., significand is even
            significand >>= 1;
            exponent++;
        }

Here is a better way to normalize the significand in the BigDecimal(double, MathContext) constructor:
        int significandTz = Long.numberOfTrailingZeros(significand);
        significand >>= significandTz;
        exponent += significandTz;


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