\frac{1 + \frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}}{2 + \frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}}\frac{1 \cdot 1 - \left(\frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}\right) \cdot \left(\frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}\right)}{\left(2 + \frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}\right) \cdot \left(1 - \frac{2 \cdot t}{1 + t} \cdot \frac{2 \cdot t}{1 + t}\right)}double code(double t) {
return ((1.0 + (((2.0 * t) / (1.0 + t)) * ((2.0 * t) / (1.0 + t)))) / (2.0 + (((2.0 * t) / (1.0 + t)) * ((2.0 * t) / (1.0 + t)))));
}
double code(double t) {
return (((1.0 * 1.0) - ((((2.0 * t) / (1.0 + t)) * ((2.0 * t) / (1.0 + t))) * (((2.0 * t) / (1.0 + t)) * ((2.0 * t) / (1.0 + t))))) / ((2.0 + (((2.0 * t) / (1.0 + t)) * ((2.0 * t) / (1.0 + t)))) * (1.0 - (((2.0 * t) / (1.0 + t)) * ((2.0 * t) / (1.0 + t))))));
}



Bits error versus t
Results
Initial program 0.1
rmApplied flip-+0.1
Applied associate-/l/0.1
Final simplification0.1
herbie shell --seed 2020056 +o rules:numerics
(FPCore (t)
:name "Kahan p13 Example 1"
:precision binary64
(/ (+ 1 (* (/ (* 2 t) (+ 1 t)) (/ (* 2 t) (+ 1 t)))) (+ 2 (* (/ (* 2 t) (+ 1 t)) (/ (* 2 t) (+ 1 t))))))