\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a}\begin{array}{l}
\mathbf{if}\;b \le -4.829903230896134050158793286773621805382 \cdot 10^{148}:\\
\;\;\;\;1 \cdot \left(\frac{c}{b} - \frac{b}{a}\right)\\
\mathbf{elif}\;b \le 1.058331905530479345989188577279018272684 \cdot 10^{-144}:\\
\;\;\;\;\frac{\left(-b\right) + \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}{2 \cdot a}\\
\mathbf{elif}\;b \le 400482480739649191422756162656796672:\\
\;\;\;\;\frac{\frac{0 + 4 \cdot \left(a \cdot c\right)}{\left(-b\right) - \sqrt{b \cdot b - \left(4 \cdot a\right) \cdot c}}}{2 \cdot a}\\
\mathbf{else}:\\
\;\;\;\;-1 \cdot \frac{c}{b}\\
\end{array}double f(double a, double b, double c) {
double r83124 = b;
double r83125 = -r83124;
double r83126 = r83124 * r83124;
double r83127 = 4.0;
double r83128 = a;
double r83129 = r83127 * r83128;
double r83130 = c;
double r83131 = r83129 * r83130;
double r83132 = r83126 - r83131;
double r83133 = sqrt(r83132);
double r83134 = r83125 + r83133;
double r83135 = 2.0;
double r83136 = r83135 * r83128;
double r83137 = r83134 / r83136;
return r83137;
}
double f(double a, double b, double c) {
double r83138 = b;
double r83139 = -4.829903230896134e+148;
bool r83140 = r83138 <= r83139;
double r83141 = 1.0;
double r83142 = c;
double r83143 = r83142 / r83138;
double r83144 = a;
double r83145 = r83138 / r83144;
double r83146 = r83143 - r83145;
double r83147 = r83141 * r83146;
double r83148 = 1.0583319055304793e-144;
bool r83149 = r83138 <= r83148;
double r83150 = -r83138;
double r83151 = r83138 * r83138;
double r83152 = 4.0;
double r83153 = r83152 * r83144;
double r83154 = r83153 * r83142;
double r83155 = r83151 - r83154;
double r83156 = sqrt(r83155);
double r83157 = r83150 + r83156;
double r83158 = 2.0;
double r83159 = r83158 * r83144;
double r83160 = r83157 / r83159;
double r83161 = 4.004824807396492e+35;
bool r83162 = r83138 <= r83161;
double r83163 = 0.0;
double r83164 = r83144 * r83142;
double r83165 = r83152 * r83164;
double r83166 = r83163 + r83165;
double r83167 = r83150 - r83156;
double r83168 = r83166 / r83167;
double r83169 = r83168 / r83159;
double r83170 = -1.0;
double r83171 = r83170 * r83143;
double r83172 = r83162 ? r83169 : r83171;
double r83173 = r83149 ? r83160 : r83172;
double r83174 = r83140 ? r83147 : r83173;
return r83174;
}




Bits error versus a




Bits error versus b




Bits error versus c
Results
| Original | 34.3 |
|---|---|
| Target | 20.9 |
| Herbie | 8.9 |
if b < -4.829903230896134e+148Initial program 61.7
Taylor expanded around -inf 2.8
Simplified2.8
if -4.829903230896134e+148 < b < 1.0583319055304793e-144Initial program 11.2
if 1.0583319055304793e-144 < b < 4.004824807396492e+35Initial program 35.7
rmApplied flip-+35.8
Simplified16.7
if 4.004824807396492e+35 < b Initial program 56.6
Taylor expanded around inf 4.3
Final simplification8.9
herbie shell --seed 2019294
(FPCore (a b c)
:name "The quadratic formula (r1)"
:precision binary64
:herbie-target
(if (< b 0.0) (/ (+ (- b) (sqrt (- (* b b) (* (* 4 a) c)))) (* 2 a)) (/ c (* a (/ (- (- b) (sqrt (- (* b b) (* (* 4 a) c)))) (* 2 a)))))
(/ (+ (- b) (sqrt (- (* b b) (* (* 4 a) c)))) (* 2 a)))