\frac{\left(-b\right) - \sqrt{b \cdot b - 4 \cdot \left(a \cdot c\right)}}{2 \cdot a}\begin{array}{l}
\mathbf{if}\;b \le -8.260729798395838 \cdot 10^{-43}:\\
\;\;\;\;{\left(-1 \cdot \frac{c}{b}\right)}^{1}\\
\mathbf{elif}\;b \le 1.67643144401154069 \cdot 10^{104}:\\
\;\;\;\;{\left(\frac{\left(-b\right) - \sqrt{b \cdot b - 4 \cdot \left(a \cdot c\right)}}{2 \cdot a}\right)}^{1}\\
\mathbf{else}:\\
\;\;\;\;1 \cdot \left(\frac{c}{b} - \frac{b}{a}\right)\\
\end{array}double f(double a, double b, double c) {
double r107745 = b;
double r107746 = -r107745;
double r107747 = r107745 * r107745;
double r107748 = 4.0;
double r107749 = a;
double r107750 = c;
double r107751 = r107749 * r107750;
double r107752 = r107748 * r107751;
double r107753 = r107747 - r107752;
double r107754 = sqrt(r107753);
double r107755 = r107746 - r107754;
double r107756 = 2.0;
double r107757 = r107756 * r107749;
double r107758 = r107755 / r107757;
return r107758;
}
double f(double a, double b, double c) {
double r107759 = b;
double r107760 = -8.260729798395838e-43;
bool r107761 = r107759 <= r107760;
double r107762 = -1.0;
double r107763 = c;
double r107764 = r107763 / r107759;
double r107765 = r107762 * r107764;
double r107766 = 1.0;
double r107767 = pow(r107765, r107766);
double r107768 = 1.6764314440115407e+104;
bool r107769 = r107759 <= r107768;
double r107770 = -r107759;
double r107771 = r107759 * r107759;
double r107772 = 4.0;
double r107773 = a;
double r107774 = r107773 * r107763;
double r107775 = r107772 * r107774;
double r107776 = r107771 - r107775;
double r107777 = sqrt(r107776);
double r107778 = r107770 - r107777;
double r107779 = 2.0;
double r107780 = r107779 * r107773;
double r107781 = r107778 / r107780;
double r107782 = pow(r107781, r107766);
double r107783 = 1.0;
double r107784 = r107759 / r107773;
double r107785 = r107764 - r107784;
double r107786 = r107783 * r107785;
double r107787 = r107769 ? r107782 : r107786;
double r107788 = r107761 ? r107767 : r107787;
return r107788;
}




Bits error versus a




Bits error versus b




Bits error versus c
Results
| Original | 34.1 |
|---|---|
| Target | 21.1 |
| Herbie | 9.9 |
if b < -8.260729798395838e-43Initial program 54.7
rmApplied div-inv54.7
rmApplied pow154.7
Applied pow154.7
Applied pow-prod-down54.7
Simplified54.7
Taylor expanded around -inf 7.3
if -8.260729798395838e-43 < b < 1.6764314440115407e+104Initial program 14.0
rmApplied div-inv14.1
rmApplied pow114.1
Applied pow114.1
Applied pow-prod-down14.1
Simplified14.0
if 1.6764314440115407e+104 < b Initial program 47.9
Taylor expanded around inf 3.3
Simplified3.3
Final simplification9.9
herbie shell --seed 2020024 +o rules:numerics
(FPCore (a b c)
:name "The quadratic formula (r2)"
:precision binary64
:herbie-target
(if (< b 0.0) (/ c (* a (/ (+ (- b) (sqrt (- (* b b) (* 4 (* a c))))) (* 2 a)))) (/ (- (- b) (sqrt (- (* b b) (* 4 (* a c))))) (* 2 a)))
(/ (- (- b) (sqrt (- (* b b) (* 4 (* a c))))) (* 2 a)))