
(FPCore (a b c) :precision binary64 (/ (+ (- b) (sqrt (- (* b b) (* 4.0 (* a c))))) (* 2.0 a)))
double code(double a, double b, double c) {
return (-b + sqrt(((b * b) - (4.0 * (a * c))))) / (2.0 * a);
}
real(8) function code(a, b, c)
real(8), intent (in) :: a
real(8), intent (in) :: b
real(8), intent (in) :: c
code = (-b + sqrt(((b * b) - (4.0d0 * (a * c))))) / (2.0d0 * a)
end function
public static double code(double a, double b, double c) {
return (-b + Math.sqrt(((b * b) - (4.0 * (a * c))))) / (2.0 * a);
}
def code(a, b, c): return (-b + math.sqrt(((b * b) - (4.0 * (a * c))))) / (2.0 * a)
function code(a, b, c) return Float64(Float64(Float64(-b) + sqrt(Float64(Float64(b * b) - Float64(4.0 * Float64(a * c))))) / Float64(2.0 * a)) end
function tmp = code(a, b, c) tmp = (-b + sqrt(((b * b) - (4.0 * (a * c))))) / (2.0 * a); end
code[a_, b_, c_] := N[(N[((-b) + N[Sqrt[N[(N[(b * b), $MachinePrecision] - N[(4.0 * N[(a * c), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / N[(2.0 * a), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\frac{\left(-b\right) + \sqrt{b \cdot b - 4 \cdot \left(a \cdot c\right)}}{2 \cdot a}
\end{array}
Sampling outcomes in binary64 precision:
Herbie found 7 alternatives:
| Alternative | Accuracy | Speedup |
|---|
(FPCore (a b c) :precision binary64 (/ (+ (- b) (sqrt (- (* b b) (* 4.0 (* a c))))) (* 2.0 a)))
double code(double a, double b, double c) {
return (-b + sqrt(((b * b) - (4.0 * (a * c))))) / (2.0 * a);
}
real(8) function code(a, b, c)
real(8), intent (in) :: a
real(8), intent (in) :: b
real(8), intent (in) :: c
code = (-b + sqrt(((b * b) - (4.0d0 * (a * c))))) / (2.0d0 * a)
end function
public static double code(double a, double b, double c) {
return (-b + Math.sqrt(((b * b) - (4.0 * (a * c))))) / (2.0 * a);
}
def code(a, b, c): return (-b + math.sqrt(((b * b) - (4.0 * (a * c))))) / (2.0 * a)
function code(a, b, c) return Float64(Float64(Float64(-b) + sqrt(Float64(Float64(b * b) - Float64(4.0 * Float64(a * c))))) / Float64(2.0 * a)) end
function tmp = code(a, b, c) tmp = (-b + sqrt(((b * b) - (4.0 * (a * c))))) / (2.0 * a); end
code[a_, b_, c_] := N[(N[((-b) + N[Sqrt[N[(N[(b * b), $MachinePrecision] - N[(4.0 * N[(a * c), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision] / N[(2.0 * a), $MachinePrecision]), $MachinePrecision]
\begin{array}{l}
\\
\frac{\left(-b\right) + \sqrt{b \cdot b - 4 \cdot \left(a \cdot c\right)}}{2 \cdot a}
\end{array}
(FPCore (a b c)
:precision binary64
(if (<= b -3.8e+166)
(/ (- b) a)
(if (<= b 4.1e-129)
(/ (- (sqrt (- (* b b) (* 4.0 (* a c)))) b) (* a 2.0))
(/ (- c) b))))
double code(double a, double b, double c) {
double tmp;
if (b <= -3.8e+166) {
tmp = -b / a;
} else if (b <= 4.1e-129) {
tmp = (sqrt(((b * b) - (4.0 * (a * c)))) - b) / (a * 2.0);
} else {
tmp = -c / b;
}
return tmp;
}
real(8) function code(a, b, c)
real(8), intent (in) :: a
real(8), intent (in) :: b
real(8), intent (in) :: c
real(8) :: tmp
if (b <= (-3.8d+166)) then
tmp = -b / a
else if (b <= 4.1d-129) then
tmp = (sqrt(((b * b) - (4.0d0 * (a * c)))) - b) / (a * 2.0d0)
else
tmp = -c / b
end if
code = tmp
end function
public static double code(double a, double b, double c) {
double tmp;
if (b <= -3.8e+166) {
tmp = -b / a;
} else if (b <= 4.1e-129) {
tmp = (Math.sqrt(((b * b) - (4.0 * (a * c)))) - b) / (a * 2.0);
} else {
tmp = -c / b;
}
return tmp;
}
def code(a, b, c): tmp = 0 if b <= -3.8e+166: tmp = -b / a elif b <= 4.1e-129: tmp = (math.sqrt(((b * b) - (4.0 * (a * c)))) - b) / (a * 2.0) else: tmp = -c / b return tmp
function code(a, b, c) tmp = 0.0 if (b <= -3.8e+166) tmp = Float64(Float64(-b) / a); elseif (b <= 4.1e-129) tmp = Float64(Float64(sqrt(Float64(Float64(b * b) - Float64(4.0 * Float64(a * c)))) - b) / Float64(a * 2.0)); else tmp = Float64(Float64(-c) / b); end return tmp end
function tmp_2 = code(a, b, c) tmp = 0.0; if (b <= -3.8e+166) tmp = -b / a; elseif (b <= 4.1e-129) tmp = (sqrt(((b * b) - (4.0 * (a * c)))) - b) / (a * 2.0); else tmp = -c / b; end tmp_2 = tmp; end
code[a_, b_, c_] := If[LessEqual[b, -3.8e+166], N[((-b) / a), $MachinePrecision], If[LessEqual[b, 4.1e-129], N[(N[(N[Sqrt[N[(N[(b * b), $MachinePrecision] - N[(4.0 * N[(a * c), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] - b), $MachinePrecision] / N[(a * 2.0), $MachinePrecision]), $MachinePrecision], N[((-c) / b), $MachinePrecision]]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;b \leq -3.8 \cdot 10^{+166}:\\
\;\;\;\;\frac{-b}{a}\\
\mathbf{elif}\;b \leq 4.1 \cdot 10^{-129}:\\
\;\;\;\;\frac{\sqrt{b \cdot b - 4 \cdot \left(a \cdot c\right)} - b}{a \cdot 2}\\
\mathbf{else}:\\
\;\;\;\;\frac{-c}{b}\\
\end{array}
\end{array}
if b < -3.80000000000000007e166Initial program 37.6%
Taylor expanded in b around -inf 95.7%
associate-*r/95.7%
mul-1-neg95.7%
Simplified95.7%
if -3.80000000000000007e166 < b < 4.1e-129Initial program 90.8%
if 4.1e-129 < b Initial program 16.2%
Taylor expanded in b around inf 84.1%
associate-*r/84.1%
neg-mul-184.1%
Simplified84.1%
Final simplification89.1%
(FPCore (a b c)
:precision binary64
(if (<= b -6.6e-46)
(- (/ c b) (/ b a))
(if (<= b 2.05e-129)
(/ (- (sqrt (* c (* a -4.0))) b) (* a 2.0))
(/ (- c) b))))
double code(double a, double b, double c) {
double tmp;
if (b <= -6.6e-46) {
tmp = (c / b) - (b / a);
} else if (b <= 2.05e-129) {
tmp = (sqrt((c * (a * -4.0))) - b) / (a * 2.0);
} else {
tmp = -c / b;
}
return tmp;
}
real(8) function code(a, b, c)
real(8), intent (in) :: a
real(8), intent (in) :: b
real(8), intent (in) :: c
real(8) :: tmp
if (b <= (-6.6d-46)) then
tmp = (c / b) - (b / a)
else if (b <= 2.05d-129) then
tmp = (sqrt((c * (a * (-4.0d0)))) - b) / (a * 2.0d0)
else
tmp = -c / b
end if
code = tmp
end function
public static double code(double a, double b, double c) {
double tmp;
if (b <= -6.6e-46) {
tmp = (c / b) - (b / a);
} else if (b <= 2.05e-129) {
tmp = (Math.sqrt((c * (a * -4.0))) - b) / (a * 2.0);
} else {
tmp = -c / b;
}
return tmp;
}
def code(a, b, c): tmp = 0 if b <= -6.6e-46: tmp = (c / b) - (b / a) elif b <= 2.05e-129: tmp = (math.sqrt((c * (a * -4.0))) - b) / (a * 2.0) else: tmp = -c / b return tmp
function code(a, b, c) tmp = 0.0 if (b <= -6.6e-46) tmp = Float64(Float64(c / b) - Float64(b / a)); elseif (b <= 2.05e-129) tmp = Float64(Float64(sqrt(Float64(c * Float64(a * -4.0))) - b) / Float64(a * 2.0)); else tmp = Float64(Float64(-c) / b); end return tmp end
function tmp_2 = code(a, b, c) tmp = 0.0; if (b <= -6.6e-46) tmp = (c / b) - (b / a); elseif (b <= 2.05e-129) tmp = (sqrt((c * (a * -4.0))) - b) / (a * 2.0); else tmp = -c / b; end tmp_2 = tmp; end
code[a_, b_, c_] := If[LessEqual[b, -6.6e-46], N[(N[(c / b), $MachinePrecision] - N[(b / a), $MachinePrecision]), $MachinePrecision], If[LessEqual[b, 2.05e-129], N[(N[(N[Sqrt[N[(c * N[(a * -4.0), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] - b), $MachinePrecision] / N[(a * 2.0), $MachinePrecision]), $MachinePrecision], N[((-c) / b), $MachinePrecision]]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;b \leq -6.6 \cdot 10^{-46}:\\
\;\;\;\;\frac{c}{b} - \frac{b}{a}\\
\mathbf{elif}\;b \leq 2.05 \cdot 10^{-129}:\\
\;\;\;\;\frac{\sqrt{c \cdot \left(a \cdot -4\right)} - b}{a \cdot 2}\\
\mathbf{else}:\\
\;\;\;\;\frac{-c}{b}\\
\end{array}
\end{array}
if b < -6.60000000000000027e-46Initial program 69.0%
Taylor expanded in b around -inf 90.0%
+-commutative90.0%
mul-1-neg90.0%
unsub-neg90.0%
Simplified90.0%
if -6.60000000000000027e-46 < b < 2.05e-129Initial program 86.8%
Taylor expanded in b around 0 74.4%
associate-*r*74.4%
Simplified74.4%
if 2.05e-129 < b Initial program 16.2%
Taylor expanded in b around inf 84.1%
associate-*r/84.1%
neg-mul-184.1%
Simplified84.1%
Final simplification83.7%
(FPCore (a b c) :precision binary64 (if (<= b -2e-310) (- (/ c b) (/ b a)) (/ (- c) b)))
double code(double a, double b, double c) {
double tmp;
if (b <= -2e-310) {
tmp = (c / b) - (b / a);
} else {
tmp = -c / b;
}
return tmp;
}
real(8) function code(a, b, c)
real(8), intent (in) :: a
real(8), intent (in) :: b
real(8), intent (in) :: c
real(8) :: tmp
if (b <= (-2d-310)) then
tmp = (c / b) - (b / a)
else
tmp = -c / b
end if
code = tmp
end function
public static double code(double a, double b, double c) {
double tmp;
if (b <= -2e-310) {
tmp = (c / b) - (b / a);
} else {
tmp = -c / b;
}
return tmp;
}
def code(a, b, c): tmp = 0 if b <= -2e-310: tmp = (c / b) - (b / a) else: tmp = -c / b return tmp
function code(a, b, c) tmp = 0.0 if (b <= -2e-310) tmp = Float64(Float64(c / b) - Float64(b / a)); else tmp = Float64(Float64(-c) / b); end return tmp end
function tmp_2 = code(a, b, c) tmp = 0.0; if (b <= -2e-310) tmp = (c / b) - (b / a); else tmp = -c / b; end tmp_2 = tmp; end
code[a_, b_, c_] := If[LessEqual[b, -2e-310], N[(N[(c / b), $MachinePrecision] - N[(b / a), $MachinePrecision]), $MachinePrecision], N[((-c) / b), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;b \leq -2 \cdot 10^{-310}:\\
\;\;\;\;\frac{c}{b} - \frac{b}{a}\\
\mathbf{else}:\\
\;\;\;\;\frac{-c}{b}\\
\end{array}
\end{array}
if b < -1.999999999999994e-310Initial program 77.3%
Taylor expanded in b around -inf 67.8%
+-commutative67.8%
mul-1-neg67.8%
unsub-neg67.8%
Simplified67.8%
if -1.999999999999994e-310 < b Initial program 25.6%
Taylor expanded in b around inf 72.6%
associate-*r/72.6%
neg-mul-172.6%
Simplified72.6%
Final simplification70.0%
(FPCore (a b c) :precision binary64 (if (<= b 6.6e+57) (/ (- b) a) (/ c b)))
double code(double a, double b, double c) {
double tmp;
if (b <= 6.6e+57) {
tmp = -b / a;
} else {
tmp = c / b;
}
return tmp;
}
real(8) function code(a, b, c)
real(8), intent (in) :: a
real(8), intent (in) :: b
real(8), intent (in) :: c
real(8) :: tmp
if (b <= 6.6d+57) then
tmp = -b / a
else
tmp = c / b
end if
code = tmp
end function
public static double code(double a, double b, double c) {
double tmp;
if (b <= 6.6e+57) {
tmp = -b / a;
} else {
tmp = c / b;
}
return tmp;
}
def code(a, b, c): tmp = 0 if b <= 6.6e+57: tmp = -b / a else: tmp = c / b return tmp
function code(a, b, c) tmp = 0.0 if (b <= 6.6e+57) tmp = Float64(Float64(-b) / a); else tmp = Float64(c / b); end return tmp end
function tmp_2 = code(a, b, c) tmp = 0.0; if (b <= 6.6e+57) tmp = -b / a; else tmp = c / b; end tmp_2 = tmp; end
code[a_, b_, c_] := If[LessEqual[b, 6.6e+57], N[((-b) / a), $MachinePrecision], N[(c / b), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;b \leq 6.6 \cdot 10^{+57}:\\
\;\;\;\;\frac{-b}{a}\\
\mathbf{else}:\\
\;\;\;\;\frac{c}{b}\\
\end{array}
\end{array}
if b < 6.6000000000000002e57Initial program 65.7%
Taylor expanded in b around -inf 48.4%
associate-*r/48.4%
mul-1-neg48.4%
Simplified48.4%
if 6.6000000000000002e57 < b Initial program 11.6%
add-sqr-sqrt6.2%
pow26.2%
pow1/26.2%
sqrt-pow16.1%
fma-neg6.2%
distribute-lft-neg-in6.2%
*-commutative6.2%
associate-*r*6.2%
metadata-eval6.2%
metadata-eval6.2%
Applied egg-rr6.2%
Taylor expanded in b around -inf 1.9%
mul-1-neg1.9%
distribute-lft-out1.9%
*-commutative1.9%
associate-*l/2.0%
*-commutative2.0%
Simplified2.0%
Taylor expanded in b around 0 29.1%
Final simplification44.2%
(FPCore (a b c) :precision binary64 (if (<= b 9e-297) (/ (- b) a) (/ (- c) b)))
double code(double a, double b, double c) {
double tmp;
if (b <= 9e-297) {
tmp = -b / a;
} else {
tmp = -c / b;
}
return tmp;
}
real(8) function code(a, b, c)
real(8), intent (in) :: a
real(8), intent (in) :: b
real(8), intent (in) :: c
real(8) :: tmp
if (b <= 9d-297) then
tmp = -b / a
else
tmp = -c / b
end if
code = tmp
end function
public static double code(double a, double b, double c) {
double tmp;
if (b <= 9e-297) {
tmp = -b / a;
} else {
tmp = -c / b;
}
return tmp;
}
def code(a, b, c): tmp = 0 if b <= 9e-297: tmp = -b / a else: tmp = -c / b return tmp
function code(a, b, c) tmp = 0.0 if (b <= 9e-297) tmp = Float64(Float64(-b) / a); else tmp = Float64(Float64(-c) / b); end return tmp end
function tmp_2 = code(a, b, c) tmp = 0.0; if (b <= 9e-297) tmp = -b / a; else tmp = -c / b; end tmp_2 = tmp; end
code[a_, b_, c_] := If[LessEqual[b, 9e-297], N[((-b) / a), $MachinePrecision], N[((-c) / b), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;b \leq 9 \cdot 10^{-297}:\\
\;\;\;\;\frac{-b}{a}\\
\mathbf{else}:\\
\;\;\;\;\frac{-c}{b}\\
\end{array}
\end{array}
if b < 8.99999999999999951e-297Initial program 77.4%
Taylor expanded in b around -inf 67.3%
associate-*r/67.3%
mul-1-neg67.3%
Simplified67.3%
if 8.99999999999999951e-297 < b Initial program 25.0%
Taylor expanded in b around inf 73.2%
associate-*r/73.2%
neg-mul-173.2%
Simplified73.2%
Final simplification69.9%
(FPCore (a b c) :precision binary64 (if (<= b 1.0) (* b c) (/ c b)))
double code(double a, double b, double c) {
double tmp;
if (b <= 1.0) {
tmp = b * c;
} else {
tmp = c / b;
}
return tmp;
}
real(8) function code(a, b, c)
real(8), intent (in) :: a
real(8), intent (in) :: b
real(8), intent (in) :: c
real(8) :: tmp
if (b <= 1.0d0) then
tmp = b * c
else
tmp = c / b
end if
code = tmp
end function
public static double code(double a, double b, double c) {
double tmp;
if (b <= 1.0) {
tmp = b * c;
} else {
tmp = c / b;
}
return tmp;
}
def code(a, b, c): tmp = 0 if b <= 1.0: tmp = b * c else: tmp = c / b return tmp
function code(a, b, c) tmp = 0.0 if (b <= 1.0) tmp = Float64(b * c); else tmp = Float64(c / b); end return tmp end
function tmp_2 = code(a, b, c) tmp = 0.0; if (b <= 1.0) tmp = b * c; else tmp = c / b; end tmp_2 = tmp; end
code[a_, b_, c_] := If[LessEqual[b, 1.0], N[(b * c), $MachinePrecision], N[(c / b), $MachinePrecision]]
\begin{array}{l}
\\
\begin{array}{l}
\mathbf{if}\;b \leq 1:\\
\;\;\;\;b \cdot c\\
\mathbf{else}:\\
\;\;\;\;\frac{c}{b}\\
\end{array}
\end{array}
if b < 1Initial program 67.9%
Taylor expanded in b around inf 8.2%
associate-/l*11.1%
Simplified11.1%
add-cube-cbrt11.0%
pow311.0%
times-frac11.0%
metadata-eval11.0%
associate-/r/10.9%
Applied egg-rr10.9%
Taylor expanded in a around 0 6.5%
Applied egg-rr5.7%
if 1 < b Initial program 13.6%
add-sqr-sqrt9.0%
pow29.0%
pow1/29.0%
sqrt-pow19.0%
fma-neg8.8%
distribute-lft-neg-in8.8%
*-commutative8.8%
associate-*r*8.8%
metadata-eval8.8%
metadata-eval8.8%
Applied egg-rr8.8%
Taylor expanded in b around -inf 2.2%
mul-1-neg2.2%
distribute-lft-out2.2%
*-commutative2.2%
associate-*l/2.2%
*-commutative2.2%
Simplified2.2%
Taylor expanded in b around 0 25.0%
Final simplification10.7%
(FPCore (a b c) :precision binary64 (* b c))
double code(double a, double b, double c) {
return b * c;
}
real(8) function code(a, b, c)
real(8), intent (in) :: a
real(8), intent (in) :: b
real(8), intent (in) :: c
code = b * c
end function
public static double code(double a, double b, double c) {
return b * c;
}
def code(a, b, c): return b * c
function code(a, b, c) return Float64(b * c) end
function tmp = code(a, b, c) tmp = b * c; end
code[a_, b_, c_] := N[(b * c), $MachinePrecision]
\begin{array}{l}
\\
b \cdot c
\end{array}
Initial program 53.9%
Taylor expanded in b around inf 24.4%
associate-/l*27.0%
Simplified27.0%
add-cube-cbrt26.8%
pow326.8%
times-frac26.8%
metadata-eval26.8%
associate-/r/25.1%
Applied egg-rr25.1%
Taylor expanded in a around 0 17.3%
Applied egg-rr4.7%
Final simplification4.7%
(FPCore (a b c)
:precision binary64
(let* ((t_0 (fabs (/ b 2.0)))
(t_1 (* (sqrt (fabs a)) (sqrt (fabs c))))
(t_2
(if (== (copysign a c) a)
(* (sqrt (- t_0 t_1)) (sqrt (+ t_0 t_1)))
(hypot (/ b 2.0) t_1))))
(if (< b 0.0) (/ (- t_2 (/ b 2.0)) a) (/ (- c) (+ (/ b 2.0) t_2)))))
double code(double a, double b, double c) {
double t_0 = fabs((b / 2.0));
double t_1 = sqrt(fabs(a)) * sqrt(fabs(c));
double tmp;
if (copysign(a, c) == a) {
tmp = sqrt((t_0 - t_1)) * sqrt((t_0 + t_1));
} else {
tmp = hypot((b / 2.0), t_1);
}
double t_2 = tmp;
double tmp_1;
if (b < 0.0) {
tmp_1 = (t_2 - (b / 2.0)) / a;
} else {
tmp_1 = -c / ((b / 2.0) + t_2);
}
return tmp_1;
}
public static double code(double a, double b, double c) {
double t_0 = Math.abs((b / 2.0));
double t_1 = Math.sqrt(Math.abs(a)) * Math.sqrt(Math.abs(c));
double tmp;
if (Math.copySign(a, c) == a) {
tmp = Math.sqrt((t_0 - t_1)) * Math.sqrt((t_0 + t_1));
} else {
tmp = Math.hypot((b / 2.0), t_1);
}
double t_2 = tmp;
double tmp_1;
if (b < 0.0) {
tmp_1 = (t_2 - (b / 2.0)) / a;
} else {
tmp_1 = -c / ((b / 2.0) + t_2);
}
return tmp_1;
}
def code(a, b, c): t_0 = math.fabs((b / 2.0)) t_1 = math.sqrt(math.fabs(a)) * math.sqrt(math.fabs(c)) tmp = 0 if math.copysign(a, c) == a: tmp = math.sqrt((t_0 - t_1)) * math.sqrt((t_0 + t_1)) else: tmp = math.hypot((b / 2.0), t_1) t_2 = tmp tmp_1 = 0 if b < 0.0: tmp_1 = (t_2 - (b / 2.0)) / a else: tmp_1 = -c / ((b / 2.0) + t_2) return tmp_1
function code(a, b, c) t_0 = abs(Float64(b / 2.0)) t_1 = Float64(sqrt(abs(a)) * sqrt(abs(c))) tmp = 0.0 if (copysign(a, c) == a) tmp = Float64(sqrt(Float64(t_0 - t_1)) * sqrt(Float64(t_0 + t_1))); else tmp = hypot(Float64(b / 2.0), t_1); end t_2 = tmp tmp_1 = 0.0 if (b < 0.0) tmp_1 = Float64(Float64(t_2 - Float64(b / 2.0)) / a); else tmp_1 = Float64(Float64(-c) / Float64(Float64(b / 2.0) + t_2)); end return tmp_1 end
function tmp_3 = code(a, b, c) t_0 = abs((b / 2.0)); t_1 = sqrt(abs(a)) * sqrt(abs(c)); tmp = 0.0; if ((sign(c) * abs(a)) == a) tmp = sqrt((t_0 - t_1)) * sqrt((t_0 + t_1)); else tmp = hypot((b / 2.0), t_1); end t_2 = tmp; tmp_2 = 0.0; if (b < 0.0) tmp_2 = (t_2 - (b / 2.0)) / a; else tmp_2 = -c / ((b / 2.0) + t_2); end tmp_3 = tmp_2; end
code[a_, b_, c_] := Block[{t$95$0 = N[Abs[N[(b / 2.0), $MachinePrecision]], $MachinePrecision]}, Block[{t$95$1 = N[(N[Sqrt[N[Abs[a], $MachinePrecision]], $MachinePrecision] * N[Sqrt[N[Abs[c], $MachinePrecision]], $MachinePrecision]), $MachinePrecision]}, Block[{t$95$2 = If[Equal[N[With[{TMP1 = Abs[a], TMP2 = Sign[c]}, TMP1 * If[TMP2 == 0, 1, TMP2]], $MachinePrecision], a], N[(N[Sqrt[N[(t$95$0 - t$95$1), $MachinePrecision]], $MachinePrecision] * N[Sqrt[N[(t$95$0 + t$95$1), $MachinePrecision]], $MachinePrecision]), $MachinePrecision], N[Sqrt[N[(b / 2.0), $MachinePrecision] ^ 2 + t$95$1 ^ 2], $MachinePrecision]]}, If[Less[b, 0.0], N[(N[(t$95$2 - N[(b / 2.0), $MachinePrecision]), $MachinePrecision] / a), $MachinePrecision], N[((-c) / N[(N[(b / 2.0), $MachinePrecision] + t$95$2), $MachinePrecision]), $MachinePrecision]]]]]
\begin{array}{l}
\\
\begin{array}{l}
t_0 := \left|\frac{b}{2}\right|\\
t_1 := \sqrt{\left|a\right|} \cdot \sqrt{\left|c\right|}\\
t_2 := \begin{array}{l}
\mathbf{if}\;\mathsf{copysign}\left(a, c\right) = a:\\
\;\;\;\;\sqrt{t_0 - t_1} \cdot \sqrt{t_0 + t_1}\\
\mathbf{else}:\\
\;\;\;\;\mathsf{hypot}\left(\frac{b}{2}, t_1\right)\\
\end{array}\\
\mathbf{if}\;b < 0:\\
\;\;\;\;\frac{t_2 - \frac{b}{2}}{a}\\
\mathbf{else}:\\
\;\;\;\;\frac{-c}{\frac{b}{2} + t_2}\\
\end{array}
\end{array}
herbie shell --seed 2023312
(FPCore (a b c)
:name "quadp (p42, positive)"
:precision binary64
:herbie-expected 10
:herbie-target
(if (< b 0.0) (/ (- (if (== (copysign a c) a) (* (sqrt (- (fabs (/ b 2.0)) (* (sqrt (fabs a)) (sqrt (fabs c))))) (sqrt (+ (fabs (/ b 2.0)) (* (sqrt (fabs a)) (sqrt (fabs c)))))) (hypot (/ b 2.0) (* (sqrt (fabs a)) (sqrt (fabs c))))) (/ b 2.0)) a) (/ (- c) (+ (/ b 2.0) (if (== (copysign a c) a) (* (sqrt (- (fabs (/ b 2.0)) (* (sqrt (fabs a)) (sqrt (fabs c))))) (sqrt (+ (fabs (/ b 2.0)) (* (sqrt (fabs a)) (sqrt (fabs c)))))) (hypot (/ b 2.0) (* (sqrt (fabs a)) (sqrt (fabs c))))))))
(/ (+ (- b) (sqrt (- (* b b) (* 4.0 (* a c))))) (* 2.0 a)))