Exception for symmetry log of sum of exp

Specification

\[\begin{array}{l} \\ \log \left(e^{a} + e^{b}\right) \end{array} \]

(FPCore (a b) :precision binary64 (log (+ (exp a) (exp b))))

double code(double a, double b) {
	return log((exp(a) + exp(b)));
}

real(8) function code(a, b)
    real(8), intent (in) :: a
    real(8), intent (in) :: b
    code = log((exp(a) + exp(b)))
end function

public static double code(double a, double b) {
	return Math.log((Math.exp(a) + Math.exp(b)));
}

def code(a, b):
	return math.log((math.exp(a) + math.exp(b)))

function code(a, b)
	return log(Float64(exp(a) + exp(b)))
end

function tmp = code(a, b)
	tmp = log((exp(a) + exp(b)));
end

code[a_, b_] := N[Log[N[(N[Exp[a], $MachinePrecision] + N[Exp[b], $MachinePrecision]), $MachinePrecision]], $MachinePrecision]

\begin{array}{l}

\\
\log \left(e^{a} + e^{b}\right)
\end{array}